Cretaceous Research最新文献_第2页

Coupled U–Pb and Lu–Hf zircon data of the marine Pilmatué Member, Agrio Formation: Implications for sedimentary provenance and source areas across the Early Cretaceous in the Neuquén Basin, Argentina

IF 1.9 3区地球科学 Q1 GEOLOGY

Cretaceous Research

Pub Date : 2025-01-15 DOI: 10.1016/j.cretres.2025.106083

Francisco I. Lugo , Marcos A. Comerio , Carlos A. Ballivián Justiniano , Jonatan A. Arnol , Julián D. Rolan , Pablo J. Pazos , Miguel A.S. Basei

The Lower Cretaceous Neuquén Basin is characterized by an almost complete stratigraphic record with marine and continental successions that have been addressed from the perspective of compositional and provenance analyses. However, determination of source areas through geological time is still a matter of debate. This work focuses in the upper Valanginian–lower Hauterivian Pilmatué Member (Agrio Formation of the Mendoza Group), a marine unit that represents shallow to offshore settings mainly composed of mudstones. In order to study the provenance and source areas, outcrop samples were examined through petrography, X-ray diffraction, and U–Pb/Lu–Hf zircon analyses. Sandstone deposits are scarce in the unit and show high compositional maturity related to fine-grained sediments preserved during transport until their final deposition. In the Pilmatué Member, the clay fraction is dominated by detrital illite and chlorite derived from the erosion of plutonic/metasedimentary basement rocks likely subjected to arid–semi-arid climate in the hinterland. Four main U–Pb age populations were determined: (1) Mesoproterozoic–Neoproterozoic, (2) Cambrian–Ordovician, (3) Permian–Triassic, and (4) Early–Middle Jurassic, which indicate an important denudation of old igneous-metamorphic basement rocks not recorded in the underlying Upper Jurassic and Lower Cretaceous units. A detailed compilation of the limited U–Pb/Lu–Hf zircon data from Upper Jurassic and Lower Cretaceous units reinforce the ideas that hinterland source regions located adjacent to the basin boundaries were the main source of clastic detritus. Since U–Pb ages show little variations across late Valanginian–Albian times, sediment transfer zones seem to have been stable during the closure of the back-arc basin stage.

{"title":"Coupled U–Pb and Lu–Hf zircon data of the marine Pilmatué Member, Agrio Formation: Implications for sedimentary provenance and source areas across the Early Cretaceous in the Neuquén Basin, Argentina","authors":"Francisco I. Lugo , Marcos A. Comerio , Carlos A. Ballivián Justiniano , Jonatan A. Arnol , Julián D. Rolan , Pablo J. Pazos , Miguel A.S. Basei","doi":"10.1016/j.cretres.2025.106083","DOIUrl":"10.1016/j.cretres.2025.106083","url":null,"abstract":"<div><div>The Lower Cretaceous Neuquén Basin is characterized by an almost complete stratigraphic record with marine and continental successions that have been addressed from the perspective of compositional and provenance analyses. However, determination of source areas through geological time is still a matter of debate. This work focuses in the upper Valanginian–lower Hauterivian Pilmatué Member (Agrio Formation of the Mendoza Group), a marine unit that represents shallow to offshore settings mainly composed of mudstones. In order to study the provenance and source areas, outcrop samples were examined through petrography, X-ray diffraction, and U–Pb/Lu–Hf zircon analyses. Sandstone deposits are scarce in the unit and show high compositional maturity related to fine-grained sediments preserved during transport until their final deposition. In the Pilmatué Member, the clay fraction is dominated by detrital illite and chlorite derived from the erosion of plutonic/metasedimentary basement rocks likely subjected to arid–semi-arid climate in the hinterland. Four main U–Pb age populations were determined: (1) Mesoproterozoic–Neoproterozoic, (2) Cambrian–Ordovician, (3) Permian–Triassic, and (4) Early–Middle Jurassic, which indicate an important denudation of old igneous-metamorphic basement rocks not recorded in the underlying Upper Jurassic and Lower Cretaceous units. A detailed compilation of the limited U–Pb/Lu–Hf zircon data from Upper Jurassic and Lower Cretaceous units reinforce the ideas that hinterland source regions located adjacent to the basin boundaries were the main source of clastic detritus. Since U–Pb ages show little variations across late Valanginian–Albian times, sediment transfer zones seem to have been stable during the closure of the back-arc basin stage.</div></div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"169 ","pages":"Article 106083"},"PeriodicalIF":1.9,"publicationDate":"2025-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143180220","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

New fish remains from the Araçatuba and Adamantina formations (Upper Cretaceous), Bauru Group, southwestern São Paulo State

IF 1.9 3区地球科学 Q1 GEOLOGY

Cretaceous Research

Pub Date : 2025-01-13 DOI: 10.1016/j.cretres.2025.106078

Patrícia Fabiana Rodrigues Costa , Joyce Celerino de Carvalho , William Roberto Nava , Rodrigo Miloni Santucci

The paleoichthyofauna of the Bauru Group is generally represented by isolated remains. This fossil record includes actinopterygians such as Lepisosteidae, Amiidae, Osteoglossiformes, Characiformes, Siluriformes, and a few Dipnoi occurrences. However, given the scarcity of more complete specimens, the Bauru Group fish diversity is poorly known when compared to other vertebrate groups of the same unit. We report new fish remains, including scales and skull fragments, from the lacustrine Araçatuba Formation and the fluvial Adamantina Formation from the Presidente Prudente region (cities of Coronel Goulart and Pirapozinho), State of São Paulo. Some skull remains were analyzed by microtomography and the ganoid scales were studied by morphometric, thin sectioning, and SEM analyses. The cycloid scales of the Bauru Group have not yet been sufficiently investigated due to the incompleteness of the material found so far. Therefore, we better characterize new cycloid scale findings with the aid of comparisons with extant taxa, which indicate that some of them can be assigned to Characiformes. We also report a dentary attributed to the genus Atractosteus (Lepisosteidae) based on unique features such as robust conical teeth with well-developed plicidentine, and the absence of a row of smaller lateral teeth. The underdeveloped morphology of the mandibular canal indicates that this is a juvenile specimen. The paleoichthyofauna of both formations are similar, with remains of Characiformes and Siluriformes showing nearly the same morphology. Lepisosteidae remains are also alike, including the presence of the genus Atractosteus. The remains of Lepisosteidae are the most abundant material found in both units, indicating either this was the predominant group of fish in the Bauru Group or that their remains are easily preserved, as ganoid scales are much more resistant to transportation than cycloid scales.

{"title":"New fish remains from the Araçatuba and Adamantina formations (Upper Cretaceous), Bauru Group, southwestern São Paulo State","authors":"Patrícia Fabiana Rodrigues Costa , Joyce Celerino de Carvalho , William Roberto Nava , Rodrigo Miloni Santucci","doi":"10.1016/j.cretres.2025.106078","DOIUrl":"10.1016/j.cretres.2025.106078","url":null,"abstract":"<div><div>The paleoichthyofauna of the Bauru Group is generally represented by isolated remains. This fossil record includes actinopterygians such as Lepisosteidae, Amiidae, Osteoglossiformes, Characiformes, Siluriformes, and a few Dipnoi occurrences. However, given the scarcity of more complete specimens, the Bauru Group fish diversity is poorly known when compared to other vertebrate groups of the same unit. We report new fish remains, including scales and skull fragments, from the lacustrine Araçatuba Formation and the fluvial Adamantina Formation from the Presidente Prudente region (cities of Coronel Goulart and Pirapozinho), State of São Paulo. Some skull remains were analyzed by microtomography and the ganoid scales were studied by morphometric, thin sectioning, and SEM analyses. The cycloid scales of the Bauru Group have not yet been sufficiently investigated due to the incompleteness of the material found so far. Therefore, we better characterize new cycloid scale findings with the aid of comparisons with extant taxa, which indicate that some of them can be assigned to Characiformes. We also report a dentary attributed to the genus <em>Atractosteus</em> (Lepisosteidae) based on unique features such as robust conical teeth with well-developed plicidentine, and the absence of a row of smaller lateral teeth. The underdeveloped morphology of the mandibular canal indicates that this is a juvenile specimen. The paleoichthyofauna of both formations are similar, with remains of Characiformes and Siluriformes showing nearly the same morphology. Lepisosteidae remains are also alike, including the presence of the genus <em>Atractosteus</em>. The remains of Lepisosteidae are the most abundant material found in both units, indicating either this was the predominant group of fish in the Bauru Group or that their remains are easily preserved, as ganoid scales are much more resistant to transportation than cycloid scales.</div></div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"169 ","pages":"Article 106078"},"PeriodicalIF":1.9,"publicationDate":"2025-01-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143180217","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Taxonomic reassessment of the genera Blittersdorffia and Diegopteryx (Neuroptera, Myrmeleontidae) from the Lower Cretaceous Crato Formation with the description of three new species

IF 1.9 3区地球科学 Q1 GEOLOGY

Cretaceous Research

Pub Date : 2025-01-13 DOI: 10.1016/j.cretres.2025.106081

Gabriel M. Bueno , Renato J.P. Machado , Caleb C. Martins , Guilherme C. Ribeiro

The Crato Formation in Brazil harbors over half of the world's known fossil diversity of Myrmeleontidae. However, many type specimens of taxa described from this formation were previously inaccessible. With the recent rediscovery of two Brazilian collections and the acquisition of several newly discovered, well-preserved specimens, we have revised two controversial Myrmeleontidae genera: Diegopteryx Martins-Neto & Rodrigues and Blittersdorffia Martins-Neto & Vulcano. In this study, we describe two new species of Diegopteryx and one new species of Blittersdorffia. Additionally, Blittersdorffia pulcherrima has been reassigned to Diegopteryx and D. raptoria is synonymized with B. pulcherrima. We provide updated diagnoses for both genera and an identification key for the species. We also examine the implications of these new findings for understanding the evolutionary relationships of these genera within fossil Myrmeleontidae.

{"title":"Taxonomic reassessment of the genera Blittersdorffia and Diegopteryx (Neuroptera, Myrmeleontidae) from the Lower Cretaceous Crato Formation with the description of three new species","authors":"Gabriel M. Bueno , Renato J.P. Machado , Caleb C. Martins , Guilherme C. Ribeiro","doi":"10.1016/j.cretres.2025.106081","DOIUrl":"10.1016/j.cretres.2025.106081","url":null,"abstract":"<div><div>The Crato Formation in Brazil harbors over half of the world's known fossil diversity of Myrmeleontidae. However, many type specimens of taxa described from this formation were previously inaccessible. With the recent rediscovery of two Brazilian collections and the acquisition of several newly discovered, well-preserved specimens, we have revised two controversial Myrmeleontidae genera: <em>Diegopteryx</em> Martins-Neto & Rodrigues and <em>Blittersdorffia</em> Martins-Neto & Vulcano. In this study, we describe two new species of Diegopteryx and one new species of <em>Blittersdorffia</em>. Additionally, <em>Blittersdorffia pulcherrima</em> has been reassigned to <em>Diegopteryx</em> and <em>D. raptoria</em> is synonymized with <em>B. pulcherrima</em>. We provide updated diagnoses for both genera and an identification key for the species. We also examine the implications of these new findings for understanding the evolutionary relationships of these genera within fossil Myrmeleontidae.</div></div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"169 ","pages":"Article 106081"},"PeriodicalIF":1.9,"publicationDate":"2025-01-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143180221","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Torreites milovanovici Grubić, 1979 in the Iranian Upper Cretaceous succession: Paleoenvironmental characteristics Torreites milovanovici Grubić, 1979 年，伊朗上白垩世演替：古环境特征

IF 1.9 3区地球科学 Q1 GEOLOGY

Cretaceous Research

Pub Date : 2025-01-13 DOI: 10.1016/j.cretres.2025.106082

Mehdi Ghaedi

Genus Torreites shows different features in comparison to other types of rudists, making them important to interpret paleoenvironmental circumstances. In the study area which is located north of Shiraz (Zagros Basin, Interior Fars) (i.e. the northwesternmost section of Torreites-bearing sections of the Middle East) about 40 specimens from the Iranian section were analyzed to interpret the paleoecological characteristics of the Campanian monospecific layer. At first sight, their morphotypes reveal the substrate, hydrodynamic energy, and other factors. Except for a limited number of specimens, they predominantly function as elevators, indicating a relatively quiet surrounding environment. There are minor organisms, including corals, gastropods, sponges, other non-rudist bivalve groups, and polychaeta, helping for more precise interpretations. The Torreites-bearing carbonate layer is situated on a soft shaly and marly siliciclastic bed, and other organisms colonized a considerable proportion of the surface of Torreites specimens. As they are photosymbiont-bearing bivalves, they may play a significant role in interpreting environmental characteristics such as trophic conditions. In addition, as surface bioerosion increases in response to elevated nutrient levels, the prevailing trophic condition is supposed to be oligotrophic to mesotrophic. Also, based on marine constituents, and previous studies, the studied interval must be deposited in a tropical environment. Based on various interpretations, hydrodynamic energy has transitioned from low to moderate levels. Besides, bioerosion rates observed on different sides and coupled specimens imply that Torreites samples should have preferred directions.

{"title":"Torreites milovanovici Grubić, 1979 in the Iranian Upper Cretaceous succession: Paleoenvironmental characteristics","authors":"Mehdi Ghaedi","doi":"10.1016/j.cretres.2025.106082","DOIUrl":"10.1016/j.cretres.2025.106082","url":null,"abstract":"<div><div>Genus <em>Torreites</em> shows different features in comparison to other types of rudists, making them important to interpret paleoenvironmental circumstances. In the study area which is located north of Shiraz (Zagros Basin, Interior Fars) (i.e. the northwesternmost section of <em>Torreites</em>-bearing sections of the Middle East) about 40 specimens from the Iranian section were analyzed to interpret the paleoecological characteristics of the Campanian monospecific layer. At first sight, their morphotypes reveal the substrate, hydrodynamic energy, and other factors. Except for a limited number of specimens, they predominantly function as elevators, indicating a relatively quiet surrounding environment. There are minor organisms, including corals, gastropods, sponges, other non-rudist bivalve groups, and polychaeta, helping for more precise interpretations. The <em>Torreites</em>-bearing carbonate layer is situated on a soft shaly and marly siliciclastic bed, and other organisms colonized a considerable proportion of the surface of <em>Torreites</em> specimens. As they are photosymbiont-bearing bivalves, they may play a significant role in interpreting environmental characteristics such as trophic conditions. In addition, as surface bioerosion increases in response to elevated nutrient levels, the prevailing trophic condition is supposed to be oligotrophic to mesotrophic. Also, based on marine constituents, and previous studies, the studied interval must be deposited in a tropical environment. Based on various interpretations, hydrodynamic energy has transitioned from low to moderate levels. Besides, bioerosion rates observed on different sides and coupled specimens imply that <em>Torreites</em> samples should have preferred directions.</div></div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"169 ","pages":"Article 106082"},"PeriodicalIF":1.9,"publicationDate":"2025-01-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143182273","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Multiple lines of evidence support anagenesis in Daspletosaurus and cladogenesis in derived tyrannosaurines

IF 1.9 3区地球科学 Q1 GEOLOGY

Cretaceous Research

Pub Date : 2025-01-11 DOI: 10.1016/j.cretres.2025.106080

Charlie Roger Scherer

Tyrannosaurines were the dominant predators of Laramidian ecosystems during the Late Cretaceous. An anagenetic hypothesis for the evolution of derived tyrannosaurines in Laramidia has received considerable attention in recent years, although studies disagree on the degree of anagenetic and cladogenetic evolution driving tyrannosaurine evolution. These studies have relied on phylogenetic results of equal weights parsimony analysis and do not consider the impact of alternative phylogenetic methodologies. Here, I build on previous work by applying maximum likelihood Bayesian inference and Extended Implied Weights parsimony analyses to competing datasets and show that both of these methods provide additional support for anagenetic evolution in tyrannosaurines. In species-level and specimen-level analyses, species of the Campanian taxon Daspletosaurus form a paraphyletic grade of tyrannosaurines leading to Tyrannosaurini. However, Daspletosaurus is shown as a distinct lineage from Tyrannosaurini by using multiple lines of evidence including the geochronology and biogeography of tyrannosaurine specimens. A fully-resolved specimen-level topology allows for the application of species delimitation techniques and reveals potentially novel metaspecies of Daspletosaurus, although no new taxa are erected here as a conservative practice. Future detailed description of the specimens analysed by this contribution and previous work may provide justification for establishing novel Daspletosaurus metaspecies. Ongoing work in refining the phylogenetics of tyrannosauroids will also aid in elucidating the true mode of evolution in Daspletosaurus. This study underscores the importance of accounting for homoplasy in specimen-level analyses by differentially weighting homoplastic characters.

{"title":"Multiple lines of evidence support anagenesis in Daspletosaurus and cladogenesis in derived tyrannosaurines","authors":"Charlie Roger Scherer","doi":"10.1016/j.cretres.2025.106080","DOIUrl":"10.1016/j.cretres.2025.106080","url":null,"abstract":"<div><div>Tyrannosaurines were the dominant predators of Laramidian ecosystems during the Late Cretaceous. An anagenetic hypothesis for the evolution of derived tyrannosaurines in Laramidia has received considerable attention in recent years, although studies disagree on the degree of anagenetic and cladogenetic evolution driving tyrannosaurine evolution. These studies have relied on phylogenetic results of equal weights parsimony analysis and do not consider the impact of alternative phylogenetic methodologies. Here, I build on previous work by applying maximum likelihood Bayesian inference and Extended Implied Weights parsimony analyses to competing datasets and show that both of these methods provide additional support for anagenetic evolution in tyrannosaurines. In species-level and specimen-level analyses, species of the Campanian taxon <em>Daspletosaurus</em> form a paraphyletic grade of tyrannosaurines leading to Tyrannosaurini. However, <em>Daspletosaurus</em> is shown as a distinct lineage from Tyrannosaurini by using multiple lines of evidence including the geochronology and biogeography of tyrannosaurine specimens. A fully-resolved specimen-level topology allows for the application of species delimitation techniques and reveals potentially novel metaspecies of <em>Daspletosaurus</em>, although no new taxa are erected here as a conservative practice. Future detailed description of the specimens analysed by this contribution and previous work may provide justification for establishing novel <em>Daspletosaurus</em> metaspecies. Ongoing work in refining the phylogenetics of tyrannosauroids will also aid in elucidating the true mode of evolution in <em>Daspletosaurus</em>. This study underscores the importance of accounting for homoplasy in specimen-level analyses by differentially weighting homoplastic characters.</div></div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"169 ","pages":"Article 106080"},"PeriodicalIF":1.9,"publicationDate":"2025-01-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143182274","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Provenance evolution and drainage reorganization during tectonic inversion of a continental rift basin: Detrital zircon evidence from the Late Cretaceous Songliao Basin, NE China

IF 1.9 3区地球科学 Q1 GEOLOGY

Cretaceous Research

Pub Date : 2025-01-09 DOI: 10.1016/j.cretres.2024.106077

Zhengxuan Wu , Yuan Gao , Dongzhao An , Liangliang Zhang , Mingang Hao , Yuyin Li

Since the Mesozoic, Northeast Asia has been profoundly influenced by the complex interactions of multiple tectonic systems. In the Late Cretaceous, subduction of the Pacific Plate beneath the Eurasian continent has caused compression of previous extensional system, called tectonic inversion, and triggered shrinkage of continental basins, such as the Songliao Basin. However, the relationship between the source-sink system and drainage pattern evolution in the Songliao Basin during the tectonic inversion period remains to be further studied, particularly in the late stage of the tectonic inversion, where the source-sink system lacks constraints from detrital zircon data. Based on the core obtained through the International Continental Scientific Drilling Project of the Songliao Basin, this study conducted U–Pb dating of the detrital zircons in the latest Cretaceous (∼70 Ma) Mingshui Formation. The zircon U–Pb data indicate that the most significant age peaks are 100 Ma, 170 Ma, and 267 Ma, while the relatively significant intervals include 220–230 Ma and 1799–1999 Ma. By comparing with the provenance areas, it is found that the provenance of the latest Cretaceous Songliao Basin, which belongs to the tectonic inversion stage, is distinctly different from that of the early Late Cretaceous post-rift stage. This significant change in the provenance system is attributed to the increased subduction rate of the Pacific plate and the shift in subduction direction since ∼84 Ma, which led to uplift and erosion in the southeastern part of the basin and consequently impacted the source-sink system of the basin.

自中生代以来，东北亚一直受到多种构造体系复杂相互作用的深刻影响。在晚白垩世，太平洋板块俯冲到欧亚大陆之下，导致之前的伸展系统被压缩，即构造反转，并引发了松辽盆地等大陆盆地的收缩。然而，构造反演时期松辽盆地的源-汇系统与排水模式演化之间的关系仍有待进一步研究，尤其是在构造反演后期，源-汇系统缺乏碎屑锆石资料的约束。本研究以松辽盆地国际大陆科学钻探项目获得的岩芯为基础，对白垩纪晚期（∼70 Ma）明水层的碎屑锆石进行了U-Pb定年。锆石U-Pb数据表明，最重要的年龄峰值为100Ma、170Ma和267Ma，相对重要的时间段包括220-230Ma和1799-1999Ma。通过与成因区对比发现，属于构造反转阶段的最晚白垩世松辽盆地的成因与晚白垩世早期后裂谷阶段的成因有明显不同。这种产状系统的重大变化是由于自∼84 Ma以来，太平洋板块俯冲速率的增加和俯冲方向的改变，导致了盆地东南部的隆起和侵蚀，从而影响了盆地的源-汇系统。

{"title":"Provenance evolution and drainage reorganization during tectonic inversion of a continental rift basin: Detrital zircon evidence from the Late Cretaceous Songliao Basin, NE China","authors":"Zhengxuan Wu , Yuan Gao , Dongzhao An , Liangliang Zhang , Mingang Hao , Yuyin Li","doi":"10.1016/j.cretres.2024.106077","DOIUrl":"10.1016/j.cretres.2024.106077","url":null,"abstract":"<div><div>Since the Mesozoic, Northeast Asia has been profoundly influenced by the complex interactions of multiple tectonic systems. In the Late Cretaceous, subduction of the Pacific Plate beneath the Eurasian continent has caused compression of previous extensional system, called tectonic inversion, and triggered shrinkage of continental basins, such as the Songliao Basin. However, the relationship between the source-sink system and drainage pattern evolution in the Songliao Basin during the tectonic inversion period remains to be further studied, particularly in the late stage of the tectonic inversion, where the source-sink system lacks constraints from detrital zircon data. Based on the core obtained through the International Continental Scientific Drilling Project of the Songliao Basin, this study conducted U–Pb dating of the detrital zircons in the latest Cretaceous (∼70 Ma) Mingshui Formation. The zircon U–Pb data indicate that the most significant age peaks are 100 Ma, 170 Ma, and 267 Ma, while the relatively significant intervals include 220–230 Ma and 1799–1999 Ma. By comparing with the provenance areas, it is found that the provenance of the latest Cretaceous Songliao Basin, which belongs to the tectonic inversion stage, is distinctly different from that of the early Late Cretaceous post-rift stage. This significant change in the provenance system is attributed to the increased subduction rate of the Pacific plate and the shift in subduction direction since ∼84 Ma, which led to uplift and erosion in the southeastern part of the basin and consequently impacted the source-sink system of the basin.</div></div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"168 ","pages":"Article 106077"},"PeriodicalIF":1.9,"publicationDate":"2025-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143180238","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Application of Ostracoda from the Lower Cretaceous Liupanshan group at Pingliang (NW China) – Biostratigraphy and palaeoecology

IF 1.9 3区地球科学 Q1 GEOLOGY

Cretaceous Research

Pub Date : 2025-01-08 DOI: 10.1016/j.cretres.2025.106079

Yaqiong Wang , Byung-Do Choi , Robin J. Smith , Deyan Wu

The ostracod fauna from the Liwaxia and Madongshan formations in the Pingliang area of the Liupanshan Basin are investigated in this study. Dominated by Liupanshania typica and Lycopterocypris infantilis, the fauna also includes Ziziphocypris costata, Bisulcocypridea gaodianensis, Cypridea astuta, C. puncticulata, Mongolocypris liupanshanensis, and Limnocythere sp. Our biostratigraphic analysis constrains the age of the Liwaxia Formation to Aptian to Albian and the Madongshan Formation to the Albian. These biostratigraphic findings facilitate the correlation of ostracods from the Liupanshan Group with contemporaneous faunas from adjacent basins in China and Mongolia, supporting the hypothesis of invertebrate faunal exchange within East Asia during the Early Cretaceous. Furthermore, the endemic genus Liupanshania is reassigned to the family Notodromadidae and subfamily Cyproidinae, based on the presence of anterior and posterior striated flanges. A significant radiation of Cyproidinae even Notodromadidae, occurred in Eurasia during the Barremian to Albian. Palaeoecologically, the dominance of the ostracod Liupanshania and its co-occurrence with stromatolites in the Pingliang area of the Liupanshan Basin suggest the presence of a saline lake under evaporative, arid climatic conditions.

本研究调查了六盘山盆地平凉地区六瓦峡地层和马东山地层的梭形目动物群。该动物群以六盘山类型（Liupanshania typica）和婴儿鞘翅目（Lycopterocypris infantilis）为主，还包括成本鞘翅目（Ziziphocypris costata）、高店鞘翅目（Bisulcocypridea gaodianensis）、星鞘翅目（Cypridea astuta）、标点鞘翅目（C. puncticulata）、六盘山蒙古鞘翅目（Mongolocypris liupanshanensis）和鞘翅目（Limnocythere sp.我们的生物地层分析将六瓦峡地层的年龄推定为始新世至白垩世，将马东山地层的年龄推定为白垩世。这些生物地层学发现有助于将六盘山组的介壳动物与中国和蒙古邻近盆地的同期动物群进行关联，从而支持早白垩世东亚地区无脊椎动物群交换的假说。此外，根据六盘山亚属前部和后部条纹状凸缘的存在，将其重新归入Notodromadidae科和Cyproidinae亚科。Cyproidinae亚科甚至Notodromadidae亚科在欧亚大陆的显著辐射发生在巴里米亚到白垩纪。从古生态学角度看，六盘山盆地平凉地区以六盘山蝶类为主，且与叠层石共生，这表明当时在干旱蒸发的气候条件下存在一个盐湖。

{"title":"Application of Ostracoda from the Lower Cretaceous Liupanshan group at Pingliang (NW China) – Biostratigraphy and palaeoecology","authors":"Yaqiong Wang , Byung-Do Choi , Robin J. Smith , Deyan Wu","doi":"10.1016/j.cretres.2025.106079","DOIUrl":"10.1016/j.cretres.2025.106079","url":null,"abstract":"<div><div>The ostracod fauna from the Liwaxia and Madongshan formations in the Pingliang area of the Liupanshan Basin are investigated in this study. Dominated by <em>Liupanshania typica</em> and <em>Lycopterocypris infantilis</em>, the fauna also includes <em>Ziziphocypris costata</em>, <em>Bisulcocypridea gaodianensis</em>, <em>Cypridea astuta</em>, <em>C. puncticulata</em>, <em>Mongolocypris liupanshanensis</em>, and <em>Limnocythere</em> sp. Our biostratigraphic analysis constrains the age of the Liwaxia Formation to Aptian to Albian and the Madongshan Formation to the Albian. These biostratigraphic findings facilitate the correlation of ostracods from the Liupanshan Group with contemporaneous faunas from adjacent basins in China and Mongolia, supporting the hypothesis of invertebrate faunal exchange within East Asia during the Early Cretaceous. Furthermore, the endemic genus <em>Liupanshania</em> is reassigned to the family Notodromadidae and subfamily Cyproidinae, based on the presence of anterior and posterior striated flanges. A significant radiation of Cyproidinae even Notodromadidae, occurred in Eurasia during the Barremian to Albian. Palaeoecologically, the dominance of the ostracod <em>Liupanshania</em> and its co-occurrence with stromatolites in the Pingliang area of the Liupanshan Basin suggest the presence of a saline lake under evaporative, arid climatic conditions.</div></div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"168 ","pages":"Article 106079"},"PeriodicalIF":1.9,"publicationDate":"2025-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143180237","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Turonian carbonate succession in central-southern Tunisia: Insights into depositional environments, sequence stratigraphy and south Tethyan margin correlations

IF 1.9 3区地球科学 Q1 GEOLOGY

Cretaceous Research

Pub Date : 2024-12-28 DOI: 10.1016/j.cretres.2024.106074

Dhouha Jomaa Salmouna , Najeh Ben Chaabane , Ferid Dhahri , Abdellatif Salmouna

New sedimentological studies and sequence stratigraphic framework of the Turonian deposits, in Tunisia, were conducted to facilitate the reading of the local stratigraphic nomenclature by comparing it with the global stratigraphic data. A new sequence stratigraphic subdivision of the Turonian interval has been proposed, based on the lithological and paleontological characteristics from Berda, Chemsi, Orbata and Belkhir sections (Gafsa area).

A detailed sedimentological investigation of the Bireno carbonates, correlated later on with other sections (northern Chotts, Sidi Bouzid, and Kasserine areas), has allowed to recognize three facies associations. They are distributed along a ramp system, evolving from proximal to distal domain and highlighting a northward deepening, well evidenced by isopach and paleogeographic maps.

Four 3rd order sequences (S-1 to S-4) have been identified; they correspond to the Bahloul Formation (lowest Turonian), the Gattar and Annaba Members (lower Turonian), the Bireno Member (lower Turonian to upper Turonian), and the Lower Aleg Member (uppermost Turonian). The most transgressive intervals correspond to the Bahloul Formation (mfs1), the Annaba Member (mfs2) and the upper B2 unit (mfs3).

The regressive ones correspond to the Gattar member, B1, B3 and B4 units. This subdivision has allowed the tracing of reasonable timelines and the correlation of the Tunisian Turonian deposits with their analogues in the southern Tethyan margin.

This study will significantly help to improve the conception of stratigraphic architecture and the depositional morphology at the scale of the southern Tethyan margin.

对突尼斯图伦纪沉积物进行了新的沉积学研究和层序地层学框架，以便通过与全球地层学数据进行比较，解读当地的地层命名法。根据 Berda、Chemsi、Orbata 和 Belkhir 剖面（加夫萨地区）的岩石学和古生物学特征，提出了图伦纪区间新的层序地层划分方法。对 Bireno 碳酸盐岩进行了详细的沉积学调查，并随后与其他剖面（乔特斯北部、西迪布齐德和卡塞林地区）进行了关联，从而确认了三个面系。它们沿着一个斜坡系统分布，从近端向远端演化，并突出向北加深，这一点在等深线和古地理图上得到了很好的证明。已经确定了四个三阶序列（S-1 至 S-4）；它们分别对应于巴赫卢勒地层（最低都龙纪）、加塔尔和安纳巴岩层（下都龙纪）、比雷诺岩层（下都龙纪至上都龙纪）以及下阿雷格岩层（最上都龙纪）。其中，最大的递变层间与巴赫卢尔地层（mfs1）、安纳巴层（mfs2）和上B2单元（mfs3）相对应，递减层间与加塔尔层、B1、B3和B4单元相对应。这项研究将大大有助于改善地层结构的概念和泰特山脉南缘的沉积形态。

{"title":"Turonian carbonate succession in central-southern Tunisia: Insights into depositional environments, sequence stratigraphy and south Tethyan margin correlations","authors":"Dhouha Jomaa Salmouna , Najeh Ben Chaabane , Ferid Dhahri , Abdellatif Salmouna","doi":"10.1016/j.cretres.2024.106074","DOIUrl":"10.1016/j.cretres.2024.106074","url":null,"abstract":"<div><div>New sedimentological studies and sequence stratigraphic framework of the Turonian deposits, in Tunisia, were conducted to facilitate the reading of the local stratigraphic nomenclature by comparing it with the global stratigraphic data. A new sequence stratigraphic subdivision of the Turonian interval has been proposed, based on the lithological and paleontological characteristics from Berda, Chemsi, Orbata and Belkhir sections (Gafsa area).</div><div>A detailed sedimentological investigation of the Bireno carbonates, correlated later on with other sections (northern Chotts, Sidi Bouzid, and Kasserine areas), has allowed to recognize three facies associations. They are distributed along a ramp system, evolving from proximal to distal domain and highlighting a northward deepening, well evidenced by isopach and paleogeographic maps.</div><div>Four 3rd order sequences (S-1 to S-4) have been identified; they correspond to the Bahloul Formation (lowest Turonian), the Gattar and Annaba Members (lower Turonian), the Bireno Member (lower Turonian to upper Turonian), and the Lower Aleg Member (uppermost Turonian). The most transgressive intervals correspond to the Bahloul Formation (mfs1), the Annaba Member (mfs2) and the upper B2 unit (mfs3).</div><div>The regressive ones correspond to the Gattar member, B1, B3 and B4 units. This subdivision has allowed the tracing of reasonable timelines and the correlation of the Tunisian Turonian deposits with their analogues in the southern Tethyan margin.</div><div>This study will significantly help to improve the conception of stratigraphic architecture and the depositional morphology at the scale of the southern Tethyan margin.</div></div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"168 ","pages":"Article 106074"},"PeriodicalIF":1.9,"publicationDate":"2024-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143180236","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

First dinosaur ichnofauna from the Bauru Group indicates Cenomanian–Turonian events led to an ‘Ornithischian Hiatus’ in the Upper Cretaceous of Southeast Brazil 来自包鲁群的首个恐龙化石群表明，仙人-土伦事件导致了巴西东南部上白垩世的 "鸟臀目断代 "现象

IF 1.9 3区地球科学 Q1 GEOLOGY

Cretaceous Research

Pub Date : 2024-12-28 DOI: 10.1016/j.cretres.2024.106075

Bruno A. Navarro , Ariovaldo A. Giaretta , Marcelo A. Fernandes , Alberto B. Carvalho , Hussam Zaher

The Cenomanian–Turonian interval represents a critical period of faunal change during the Late Cretaceous. Although the main causes of this turnover are contentious, it is undeniable that these global events significantly influenced the last stages of dinosaur evolution. The Bauru Group in southeastern Brazil is known for its rich body-fossil record of crocodyliform and dinosaur remains, representing a key geological unit for understanding the evolution of continental biotas in the Upper Cretaceous of Gondwana. However, the ichnological record in these units are scarce, primarily consisting of invertebrate burrows and rare tetrapod traces. This study focuses on the newly discovered tracksite within the Cenomanian–Turonian Santo Anastácio Formation, marking the first dinosaur ichnofauna identified in the Bauru Group. The new ichnocoenosis includes four theropod morphotypes, a quadrupedal and a small bipedal ornithischian, bipedal and graviportal ornithopods, and a small, narrow-gauged sauropod trackmaker. These tracks provide new insights into the dinosaur faunas during the Cenomanian–Turonian interval and highlight the existence of clades not previously identified in the Bauru Group, particularly ornithischians. The absence of body fossils of these taxa in the younger strata of the Bauru Group indicates that the successive environmental fluctuations during the Cenomanian–Turonian may have been responsible for regional extinctions or migration of these animals to higher latitudes. This ecological shift might have allowed specialized crocodyliforms like sphagesaurians to fill the niches left by small herbivorous dinosaurs in the Bauru Group, while titanosaurians dominate the medium-to-large herbivore roles in these ancient ecosystems.

{"title":"First dinosaur ichnofauna from the Bauru Group indicates Cenomanian–Turonian events led to an ‘Ornithischian Hiatus’ in the Upper Cretaceous of Southeast Brazil","authors":"Bruno A. Navarro , Ariovaldo A. Giaretta , Marcelo A. Fernandes , Alberto B. Carvalho , Hussam Zaher","doi":"10.1016/j.cretres.2024.106075","DOIUrl":"10.1016/j.cretres.2024.106075","url":null,"abstract":"<div><div>The Cenomanian–Turonian interval represents a critical period of faunal change during the Late Cretaceous. Although the main causes of this turnover are contentious, it is undeniable that these global events significantly influenced the last stages of dinosaur evolution. The Bauru Group in southeastern Brazil is known for its rich body-fossil record of crocodyliform and dinosaur remains, representing a key geological unit for understanding the evolution of continental biotas in the Upper Cretaceous of Gondwana. However, the ichnological record in these units are scarce, primarily consisting of invertebrate burrows and rare tetrapod traces. This study focuses on the newly discovered tracksite within the Cenomanian–Turonian Santo Anastácio Formation, marking the first dinosaur ichnofauna identified in the Bauru Group. The new ichnocoenosis includes four theropod morphotypes, a quadrupedal and a small bipedal ornithischian, bipedal and graviportal ornithopods, and a small, narrow-gauged sauropod trackmaker. These tracks provide new insights into the dinosaur faunas during the Cenomanian–Turonian interval and highlight the existence of clades not previously identified in the Bauru Group, particularly ornithischians. The absence of body fossils of these taxa in the younger strata of the Bauru Group indicates that the successive environmental fluctuations during the Cenomanian–Turonian may have been responsible for regional extinctions or migration of these animals to higher latitudes. This ecological shift might have allowed specialized crocodyliforms like sphagesaurians to fill the niches left by small herbivorous dinosaurs in the Bauru Group, while titanosaurians dominate the medium-to-large herbivore roles in these ancient ecosystems.</div></div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"168 ","pages":"Article 106075"},"PeriodicalIF":1.9,"publicationDate":"2024-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143181580","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A widely distributed upper Aptian shallow-marine tsunami deposit in the Miyako Group, northeast Japan

IF 1.9 3区地球科学 Q1 GEOLOGY

Cretaceous Research

Pub Date : 2024-12-27 DOI: 10.1016/j.cretres.2024.106073

Shigehiro Fujino , Haruyoshi Maeda

We report a newly discovered characteristic event deposit of late Aptian age in the Tanohata Formation of the Lower Cretaceous Miyako Group in northeast Japan. The event deposit is 1.5–5.5 m thick and contains internal erosional surfaces that divide the event deposit into multiple sub-layers. Sigmoidal cross-stratification, which is often formed under hydraulic conditions transitional between upper and lower flow regimes, was observed at the top of the deposit. The event deposit lies on an erosional surface cut approximately 4 m into the underlying strata and contains sand rip-up clasts of underlying strata. The presence of sand rip-up clasts reflects the powerful effect of this event on the shallow seafloor, which caused erosion of the cemented substrate and generated boulder-size clasts. On the basis of these sedimentological features, we interpret the event deposit as a tsunami deposit. A previous study reported a tsunami deposit about 20 km away from this study site at exactly the same lithostratigraphic horizon as the tsunami deposit reported in this study. The fact that tsunami deposits were found at the same stratigraphic horizon in two distant areas indicate that sediment transport and deposition by the tsunami was substantial and extensive. We hypothesize that other deposits formed by the same tsunami may be present in other upper Aptian strata across the western Pacific region.

我们报告了在日本东北部下白垩统宫古组田野畑地层中新发现的晚万古年特征事件沉积。该事件沉积厚度为 1.5-5.5 米，包含将事件沉积划分为多个子层的内部侵蚀面。在沉积顶部观察到了乙字形交叉层理，这种层理通常是在上层和下层流态过渡的水力条件下形成的。该事件沉积层位于下伏地层约 4 米处的侵蚀面上，包含下伏地层的砂质裂隙碎屑。砂质裂隙碎屑的存在反映了这一事件对浅海海底的强大影响，它造成了对胶结基底的侵蚀，并产生了巨石大小的碎屑。根据这些沉积特征，我们将该事件沉积解释为海啸沉积。之前的一项研究报告称，在距离本研究地点约 20 公里处有一处海啸沉积，其岩层层位与本研究报告的海啸沉积层位完全相同。在两个遥远地区的同一地层中发现海啸沉积物这一事实表明，海啸造成的沉积物搬运和沉积是巨大而广泛的。我们推测，在西太平洋地区的其他上古宙地层中也可能存在由同一海啸形成的其他沉积。

{"title":"A widely distributed upper Aptian shallow-marine tsunami deposit in the Miyako Group, northeast Japan","authors":"Shigehiro Fujino , Haruyoshi Maeda","doi":"10.1016/j.cretres.2024.106073","DOIUrl":"10.1016/j.cretres.2024.106073","url":null,"abstract":"<div><div>We report a newly discovered characteristic event deposit of late Aptian age in the Tanohata Formation of the Lower Cretaceous Miyako Group in northeast Japan. The event deposit is 1.5–5.5 m thick and contains internal erosional surfaces that divide the event deposit into multiple sub-layers. Sigmoidal cross-stratification, which is often formed under hydraulic conditions transitional between upper and lower flow regimes, was observed at the top of the deposit. The event deposit lies on an erosional surface cut approximately 4 m into the underlying strata and contains sand rip-up clasts of underlying strata. The presence of sand rip-up clasts reflects the powerful effect of this event on the shallow seafloor, which caused erosion of the cemented substrate and generated boulder-size clasts. On the basis of these sedimentological features, we interpret the event deposit as a tsunami deposit. A previous study reported a tsunami deposit about 20 km away from this study site at exactly the same lithostratigraphic horizon as the tsunami deposit reported in this study. The fact that tsunami deposits were found at the same stratigraphic horizon in two distant areas indicate that sediment transport and deposition by the tsunami was substantial and extensive. We hypothesize that other deposits formed by the same tsunami may be present in other upper Aptian strata across the western Pacific region.</div></div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"168 ","pages":"Article 106073"},"PeriodicalIF":1.9,"publicationDate":"2024-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143181846","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0