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Actinomma sogndalensis n. sp. (Radiolaria, Polycystina) an endemic species to the Sognefjord, western Norway
IF 0.7 Q4 PALEONTOLOGY Pub Date : 2024-09-16 DOI: 10.1016/j.revmic.2024.100818
Jane K. Dolven , Kjell R. Bjørklund
Studies of polycystine radiolarians (marine planktonic protists) have shown that great faunistic differences occur between the different Norwegian fjord systems. Plankton studies by Swanberg and Bjørklund in the early 1980′s identified more than 55 polycystine radiolarian species, including two unidentified forms of Actinomma noted as sp. A and sp. B. The discovery of fully developed adult individuals of the same taxa in plankton material from the Sogndalsfjord in 2010 revealed that the sp. A form in fact was a juvenile stage of the sp. B form. Its general morphologic skeletal structure differs so much from the other local Actinomma species that the whole concept of how to define, and what to include in, this genus has been taken up here for discussion.
This new species, described herein as Actinomma sogndalensis, has mainly been found in the Sognefjord, which leads us to conclude that A. sogndalensis might be an example of a real endemic fjord species. Due to the fragility of the latticed cortical shells, only the two thick primary medullary shells are preserved in the sediment. This led us to include a discussion regarding the number of concentric shells and their relevance or usefulness as a taxonomic criterion at the genus level in conjunction with this description of the new species. The genus Actinomma is emended to include species with two or multiple lattice spheres. Cromyechinus is by us still regarded as a junior synonym of Actinomma.
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引用次数: 0
Late Silurian – Early Devonian marine ostracods from Kuan Tung Formation, Satun Province, southern Thailand
IF 0.7 Q4 PALEONTOLOGY Pub Date : 2024-09-10 DOI: 10.1016/j.revmic.2024.100817
Anucha Promduang, Anisong Chitnarin
Late Silurian to Early Devonian ostracods are reported for the first time from the Kuan Tung Formation (Sibumasu terrane) in southern Thailand. The studied limestone samples yielded abundant ostracods belonging to five suborders, six superfamilies, 17 genera, and 34 species, including the newly described Ampuloides thungsamedensis nov. sp. Other species are members of Ampuloides, Microcheilinella, Bairdiocypris, Baschkirina?, Rectella?, Pseudorayella, Acratia, Bairdia, Fabalicypris, Cytherellina, Healdia, Kummerowia?, Aparchites, Brevidorsa, Samarella, Coelonella, Knoxiella? with a few specimens of Eridoconchidae. Overall, the composition of ostracod assemblages is stable from the lower to middle subunits of the study section and points to shallow water environment on a carbonate deep shelf below the fair-weather wave base. The fauna shows relationships with Early to Late Devonian ostracods from South China, suggesting a narrow seaway between Sibumasu and South China terranes during Late Silurian to Early Devonian (late Ludlow to early Emsian).
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引用次数: 0
A reassessment of the type-materials of Ostracoda (Crustacea, Oligostraca) lost in the “Museu Nacional” Great Fire of September 2, 2018
IF 0.7 Q4 PALEONTOLOGY Pub Date : 2024-08-29 DOI: 10.1016/j.revmic.2024.100807
Lucas Silveira Antonietto , David Ian Machado Alves , Cláudio Magalhães Almeida , Dermeval Aparecido do Carmo , Vera Maria Medina da Fonseca
On September 2, 2018, a catastrophic fire occurred at the “Museu Nacional” in Rio de Janeiro, Brazil, nearly destroying its once rich scientific collections. That accident latter generated a movement from the museum and the scientific community to restore their collections, either by bringing new specimens to the institution or by providing information about the ones lost in the tragedy. Herein we present our contribution to that effort: high-resolution scanning electron microscope images of holotypes and paratypes of 23 fossil ostracod species and subspecies that were destroyed by the “Museu Nacional” fire. These taxa occur in several Brazilian and central West African Lower Cretaceous lithological units, and some of them (Cypridea [Pseudocypridina] faveolata and Sebastianites fida minor) are even guide fossils to these strata. The present images and taxonomical updates of species – including new combinations for Sebastianites fida minor, Sebastianites? minima, Sebastianites? sostensis granulata and Theriosynoecum ventrostriatum – will also enable future studies of ostracod species from Brazilian and central West African Lower Cretaceous basins, as they provide an accurate system of identification in absence of direct observation of these type specimens once housed at the “Museu Nacional” scientific collections.
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引用次数: 0
Taxonomic significance of the radiolarian family Tetraspinocyrtiidae Kozur and Mostler and related families from the Sorgun Ophiolitic Mélange, southern Turkey 土耳其南部索尔贡蛇绿岩夹层中的放射虫科 Tetraspinocyrtiidae Kozur 和 Mostler 及相关科的分类意义
IF 0.7 Q4 PALEONTOLOGY Pub Date : 2024-08-22 DOI: 10.1016/j.revmic.2024.100808
Péter Ozsvárt , Paulian Dumitrica , Patrice Moix
The present work evaluates the significance of the early Tuvalian (late Carnian, Late Triassic) Tetraspinocyrtiidae and related families (radiolarians) from the Sorgun Ophiolitic Mélange, southern Turkey. Two new genera: Nogursa and Sorgunocyrtis and additional fifteen new species and a new subspecies are described from the Tavusçayırı Block, northeast of Sorgun village, Mersin, southern Turkey. The radiolarian fauna belongs to the Spongotortilispinus moixi Radiolarian Zone (equivalent to Paragondolella postinclinata – Paragondolella noah Conodont Zone).
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引用次数: 0
Late Famennian (latest Strunian) palynomorph assemblages and their role in the Neves Formation depositional environment—The Neves-Corvo mine case study (Iberian Pyrite Belt, Portugal) 法门纪晚期(志留纪晚期)古生物组合及其在内韦斯地层沉积环境中的作用--内韦斯-科沃矿区案例研究(葡萄牙伊比利亚黄铁矿带)
IF 0.7 Q4 PALEONTOLOGY Pub Date : 2024-07-26 DOI: 10.1016/j.revmic.2024.100805
Márcia Mendes , Zélia Pereira , João X. Matos , Luis Albardeiro , Igor Morais , Vitor Araújo

This research examines palynomorph assemblages preserved in sediments of the Iberian Pyrite Belt (IPB) that host the Neves-Corvo massive sulfide deposit and its importance for mineral exploration. The sediments belong to the Neves Formation, characterized by black shales and minor occurrences of siltstones and cherts, indicative of reduced environmental conditions, favorable to sulfide deposition in a hydrothermal context dominated by submarine felsic volcanism and graben structures. Analysis was performed in barren drill holes (e.g., Monte Novo), as opposed to productive sectors with massive sulfide mineralization and/or stockwork vein networks (e.g., Lombador, Corvo and Semblana deposits) and favorable sectors like Algaré. The recovered palynological assemblages are assigned to the LN Miospore Biozone, indicating a Late Famennian (latest Strunian) age. Several characteristic species of this age are identified, such as Retispora lepidophyta and Verrucosisporites nitidus in close association with Densosporites spitbergensis, Dictyotriletes fimbriatus, Retusotriletes cf. incohatus, Retusotriletes crassus, Vallatisporites spp. (including V. pusillites, and V. verrucosus). Despite some palynomorphs showing signs of breakage, folding, and indistinctness, no significant preservation or diversity differences were noted between barren and mineralized areas. The high abundance of marine phytoplankton in all studied black shales indicates ecologically stressed setting, dominated by dysoxic to anoxic conditions in a distal marine setting with active felsic volcanism and hydrothermal mineralizing events during Late Famennian time. This geologic context correlates with other IPB deposits and the global latest Devonian anoxic Hangenberg event.

本研究考察了伊比利亚黄铁矿带(IPB)沉积物中保存的古动物群落,该沉积物是内韦斯-科沃块状硫化物矿床的所在地,并考察了其对矿产勘探的重要性。这些沉积物属于内维斯地层(Neves Formation),其特征是黑色页岩以及少量粉砂岩和白垩岩,表明环境条件恶化,有利于硫化物在以海底长石火山活动和地堑结构为主的热液环境中沉积。分析是在贫瘠的钻孔(如 Monte Novo)中进行的,而不是在具有块状硫化物矿化和/或网状矿脉网络的富矿区(如 Lombador、Corvo 和 Semblana 矿床)以及 Algaré 等富矿区进行的。采集到的古植物群落被归入 LN Miospore 生物区,表明其年代为法门纪晚期(Strunian 晚期)。发现了这一时代的几个特征物种,如与 Densosporites spitbergensis、Dictyotriletes fimbriatus、Retusotriletes cf. incohatus、Retusotriletes crassus、Vallatisporites spp.(包括 V. pusillites 和 V. verrucosus)密切相关的 Retispora lepidophyta 和 Verrucosisporites nitidus。尽管一些古动物有断裂、褶皱和模糊不清的迹象,但在贫瘠区和矿化区之间没有发现明显的保存或多样性差异。在所有研究的黑色页岩中,海洋浮游植物都非常丰富,这表明在晚法门纪时,远海环境中的缺氧到缺氧条件占主导地位,并伴有活跃的长石火山活动和热液矿化事件,生态环境十分恶劣。这一地质背景与其他 IPB 矿床和全球最新泥盆纪缺氧 Hangenberg 事件相关。
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引用次数: 0
Middle Triassic and middle Permian radiolarians from the Kamitaki Complex in the Sasayama area, Hyogo Prefecture, Southwest Japan: Evidence for Triassic plate subduction along the eastern margin of Paleo-Asia 日本西南部兵库县筱山地区上泷复合体中三叠世和中二叠世放射虫:古亚洲东缘三叠纪板块俯冲的证据
IF 0.7 Q4 PALEONTOLOGY Pub Date : 2024-06-26 DOI: 10.1016/j.revmic.2024.100788
Yoshiaki Sugamori

The Kamitaki Complex, situated in the Sasayama area in Southwest Japan, has long been presumed to be a Permian subduction-related accretionary complex based on correlations from previous studies. However, because of the lack of fossil evidence, the exact age of the complex remained uncertain for a long time period. To address this gap in knowledge, a geological survey and microfossil mapping were conducted in the Kamitaki Complex to determine its age and geological context.

A geological survey revealed that the Kamitaki Complex mainly consists of clastic rocks, and a mixture of sandstone, basalt, and chert blocks within the mudstones. The Kamitaki Complex is tectonically intercalated into the Lopingian (Late Permian) accretionary complex of the Ultra-Tamba Terrane and Late Triassic accretionary complex of the Tamba Terrane. The lithological and structural characteristics of the Kamitaki Complex confirm that it is an accretionary complex. Microfossil mapping yielded depositional ages, with radiolarian fauna such as Eptingium nakasekoi, Pseudostylosphaera japonica, Cryptostephanidium japonicum, and Oertlispongus cf. diacanthus identified in mudstones suggesting an Anisian (early Middle Triassic) age. In contrast, radiolarian fauna found in cherts, including Pseudoalbaillella? aff. longicornis, and Follicucullus cf. porrectus, indicate an early Capitanian (late Guadalupian, middle Permian) depositional age. These findings suggest that the Kamitaki Complex records a trenchward migration of the oceanic plate in a pelagic environment from the early Capitanian and an accretion at the trench during the Anisian period.

Conventionally, the plate boundary between the Panthalassa and Paleo-Asia during the latest Permian to Middle Triassic was of the transform type, primarily because no subduction-related accretionary complexes from this period have been identified in the Japanese Islands. However, the discovery of Kamitaki Complex, an Anisian accretionary complex, provides evidence of Middle Triassic subduction activity along the eastern margin of Paleo-Asia. According to the internal structure and age polarity of the Ultra-Tamba and Tamba terranes, an accretionary complex developed over a prolonged period (approximately 120 million years) in a tectonic setting that persisted along the eastern margin of Paleo-Asia from the late Guadalupian to the earliest Cretaceous period.

神泷复合体位于日本西南部的筱山地区,根据以往研究的相关性,长期以来一直被推测为二叠纪与俯冲有关的增生复合体。然而,由于缺乏化石证据,该复合体的确切年龄在很长一段时间内仍不确定。地质调查显示,卡米塔基岩群主要由碎屑岩组成,泥岩中夹杂着砂岩、玄武岩和白垩岩块。上泷岩群在构造上与超丹巴地层的洛平纪(二叠纪晚期)增生复合体和丹巴地层的三叠纪晚期增生复合体相互交错。上泷岩群的岩性和构造特征证实了这是一个增生岩群。微化石测绘得出了沉积年代,在泥岩中发现了放射虫动物群,如 Eptingium nakasekoi、Pseudostylosphaera japonica、Cryptostephanidium japonicum 和 Oertlispongus cf. diacanthus,这表明其年代为阿尼斯纪(中三叠世早期)。与此相反,在白垩岩中发现的放射虫动物群,包括 Pseudoalbaillella? aff. longicornis 和 Follicucullus cf. porrectus,表明其沉积时代为卡皮坦纪早期(瓜达卢皮纪晚期,二叠纪中期)。这些发现表明,上泷复合体记录了大洋板块从早卡皮坦纪起在大洋环境中向海沟迁移的过程,以及安尼西纪期间在海沟的增生过程。传统上,二叠纪晚期至三叠纪中期泛塔拉萨与古亚洲之间的板块边界属于转换类型,这主要是因为在日本列岛尚未发现这一时期与俯冲有关的增生复合体。然而,上泷复合体(一个安息年增生复合体)的发现为古亚洲东缘的中三叠世俯冲活动提供了证据。根据超丹巴地层和丹巴地层的内部结构和年龄极性,在古亚洲东缘从瓜岛纪晚期到白垩纪早期的构造环境中,经过漫长的时期(约 1.2 亿年),形成了一个增生复合体。
{"title":"Middle Triassic and middle Permian radiolarians from the Kamitaki Complex in the Sasayama area, Hyogo Prefecture, Southwest Japan: Evidence for Triassic plate subduction along the eastern margin of Paleo-Asia","authors":"Yoshiaki Sugamori","doi":"10.1016/j.revmic.2024.100788","DOIUrl":"10.1016/j.revmic.2024.100788","url":null,"abstract":"<div><p>The Kamitaki Complex, situated in the Sasayama area in Southwest Japan, has long been presumed to be a Permian<span><span> subduction-related accretionary complex based on correlations from previous studies. However, because of the lack of fossil evidence, the exact age of the complex remained uncertain for a long time period. To address this gap in knowledge, a geological survey and </span>microfossil mapping were conducted in the Kamitaki Complex to determine its age and geological context.</span></p><p><span><span><span>A geological survey revealed that the Kamitaki Complex mainly consists of clastic rocks, and a mixture of sandstone, </span>basalt, and </span>chert<span><span><span> blocks within the mudstones. The Kamitaki Complex is tectonically intercalated into the </span>Lopingian (Late Permian) accretionary complex of the Ultra-Tamba </span>Terrane<span><span> and Late Triassic accretionary complex of the Tamba Terrane. The lithological and structural characteristics of the Kamitaki Complex confirm that it is an accretionary complex. Microfossil mapping yielded depositional ages, with </span>radiolarian fauna such as </span></span></span><em>Eptingium nakasekoi, Pseudostylosphaera japonica, Cryptostephanidium japonicum</em>, and <em>Oertlispongus</em> cf. <em>diacanthus</em><span> identified in mudstones suggesting an Anisian (early Middle Triassic) age. In contrast, radiolarian fauna found in cherts, including </span><em>Pseudoalbaillella</em>? aff. <em>longicornis</em>, and <em>Follicucullus</em> cf. <em>porrectus</em><span><span>, indicate an early Capitanian (late Guadalupian, middle Permian) depositional age. These findings suggest that the Kamitaki Complex records a trenchward migration of the oceanic plate in a </span>pelagic environment<span> from the early Capitanian and an accretion at the trench during the Anisian period.</span></span></p><p><span><span>Conventionally, the plate boundary between the Panthalassa and Paleo-Asia during the latest Permian to </span>Middle Triassic was of the transform type, primarily because no subduction-related accretionary complexes from this period have been identified in the Japanese Islands. However, the discovery of Kamitaki Complex, an Anisian accretionary complex, provides evidence of Middle Triassic subduction activity along the eastern margin of Paleo-Asia. According to the internal structure and age polarity of the Ultra-Tamba and Tamba terranes, an accretionary complex developed over a prolonged period (approximately 120 million years) in a </span>tectonic setting<span> that persisted along the eastern margin of Paleo-Asia from the late Guadalupian to the earliest Cretaceous period.</span></p></div>","PeriodicalId":45442,"journal":{"name":"REVUE DE MICROPALEONTOLOGIE","volume":"84 ","pages":"Article 100788"},"PeriodicalIF":0.7,"publicationDate":"2024-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141963998","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Radiolarian dating of cherts from the Artofago Cave: Insights into prehistoric lithic tool production and resource exploitation in Southern Tuscany, Italy 阿尔托法戈洞穴白垩的放射虫测年:意大利南托斯卡纳史前石器制作和资源开发的启示
IF 0.7 Q4 PALEONTOLOGY Pub Date : 2024-06-20 DOI: 10.1016/j.revmic.2024.100790
Dario Ferrari , Marco Chiari , Enrico Pandeli , Luca Bachechi

New perspectives in the archaeometric investigation of the chert used in lithic tool assemblages allow us to learn more about the socio−economic behavior of prehistoric human groups. The case study presented here is from the Artofago Cave in South Tuscany, Italy. Among other findings, an Upper Paleolithic lithic complex was excavated from a large fireplace near the entrance.

The purpose of this study is to gather data aimed at determining the raw material used in the production of these lithic tools, thereby enhancing research into its geographic source area. Here we highlight the significance of the geological age of the rock as one of key factors enabling us to formulate hypotheses about its geological provenance. It showcases a successful application of radiolarian biostratigraphy in dating cherts from the archaeological record. Specifically, 67 chert samples from the Upper Paleolithic lithic complex of the Artofago cave were treated with HF to isolate the radiolarian assemblages. The samples had been carefully chosen in advance between broken chert pieces (chert debris) in the waste material given that the analysis is partially destructive.

Chert samples can be assigned to a Middle − Late Jurassic age, more specifically middle Callovian−early Oxfordian to late Kimmeridgian−early Tithonian (UAZ 8-11).

These ages are comparable with those of the Diaspri di Monte Alpe Formation of the Ligurian Vara Unit, the uppermost tectonic unit of the Northern Apennines.

对石器组合中使用的燧石进行考古调查的新视角使我们能够更多地了解史前人类群体的社会经济行为。本文介绍的案例研究来自意大利南托斯卡纳的阿尔托法戈洞穴。这项研究的目的是收集数据,以确定制作这些石器的原材料,从而加强对其地理来源地区的研究。在此,我们强调岩石地质年代的重要性,它是使我们能够对其地质来源提出假设的关键因素之一。它展示了放射虫生物地层学在确定考古记录中的白垩岩年代方面的成功应用。具体来说,对来自阿尔托法戈洞穴旧石器时代上层石器群的 67 个白垩石样本进行了高频处理,以分离出放射虫组合。鉴于分析具有部分破坏性,这些样本是事先在废料中的破碎石块(石屑)之间精心挑选的。这些石块样本可归入中-晚侏罗世时代,更具体地说是卡利奥维世中期-牛津世早期到金默里德世晚期-提托尼世早期(UAZ 8-11)。
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引用次数: 0
Miocene radiolarian assemblages from the submarine Vityaz Ridge, Northwest Pacific: Biostratigraphy and paleoceanography 西北太平洋维蒂亚兹海脊海底中新世放射虫组合:生物地层学和古海洋学
IF 0.7 Q4 PALEONTOLOGY Pub Date : 2024-05-27 DOI: 10.1016/j.revmic.2024.100789
L.N. Vasilenko , Yu.P. Vasilenko , Xuefa Shi , Yanguang Liu

This study presents the first data on radiolarian fauna from Miocene deposits of the submarine Vityaz Ridge (SVR) and paraxial zone of the Kuril-Kamchatka Trench. Twenty-two dredge samples were studied, and 214 radiolarian taxa were identified. Taxonomic composition allowed their assignment to Miocene assemblage zones, including Lipmanella japonica conica-Gondwanaria dogieli, Pentactinosphaera hokurikuensis, Dendrospyris sakaii, Eucyrtidium inflatum Subzone a, Lychnocanoma magnacornuta, and Lychnocanoma parallelipes zones. These radiolarian assemblages correlate with studied sequences of many deep-sea cores in the northern Pacific and some sections of onshore Japan. As a result, we designed a biostratigraphic scheme of Miocene radiolarians for the SVR and reconstructed the environmental conditions in this area. In particular, two Miocene climatic optima that were previously established in the northern Pacific were identified in the Middle and Upper Miocene sediments of the southern plateau and Middle Miocene sediments of the northern plateau of the SVR.

本研究首次提供了有关千岛-堪察加海沟维蒂亚兹海脊(SVR)和准轴带中新世沉积物中放射虫动物群的数据。对 22 个挖掘样本进行了研究,确定了 214 个放射虫类群。从分类组成上可以将它们归入中新世组合区,包括 Lipmanella japonica conica-Gondwanaria dogieli、Pentactinosphaera hokurikuensis、Dendrospyris sakaii、Eucyrtidium inflatum subzone a、Lychnocanoma magnacornuta 和 Lychnocanoma parallelipes 区。这些放射虫组合与北太平洋许多深海岩芯和日本陆地部分地段的研究序列相关。因此,我们为 SVR 设计了中新世放射虫生物地层方案,并重建了该地区的环境条件。特别是,我们在 SVR 南部高原的中新世和上新世沉积物以及北部高原的中新世沉积物中发现了之前在北太平洋建立的两个中新世最佳气候。
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引用次数: 0
Organic walled dinoflagellate cyst biostratigraphy of the middle-late Miocene western Niger Delta, Nigeria 尼日利亚尼日尔三角洲西部中新世中晚期有机壁甲藻囊生物地层学
IF 0.7 Q4 PALEONTOLOGY Pub Date : 2024-05-21 DOI: 10.1016/j.revmic.2024.100787

Palynological analysis of 200 ditch cuttings of wells M6 and M7 from the western Niger Delta yield a diverse assemblage of pollen, spores, freshwater algae, foraminiferal wall linings and dinoflagellate cysts. Based on pollen and spore marker species, the wells date middle – late Miocene (P720-P860). The regular occurrence of dinoflagellate cysts enhances the subdivision of the sequences into eight and seven tentative dinoflagellate cysts assemblage zones for the M6 and M7 wells respectively. The proposed Niger Delta Dinoflagellate Cysts (C-I) zones are viz: the Lingulodinium machaerophorum Assemblage zone; Homotryblium spp./Sumatradinium spp. Assemblage zone; Operculodinium centrocarpum Assemblage zone; Nematosphaeropsis labyrinthus Assemblage zone; and the Protoperidinium spp./Selenopemphix spp. Assemblage zone. The boundaries are marked by remarkable dinocysts events such as first downhole occurrences or highest stratigraphic occurrences, supplemented with last downhole occurrences or lowest stratigraphic occurrences as the samples were ditch cuttings. The common presence of dinoflagellate cysts and the dominance of Nematosphaeropsis labyrinthus and Impagidinium spp. indicate open marine conditions during the deposition of the studied section.

对尼日尔三角洲西部 M6 和 M7 号井的 200 个沟渠切片进行了古生物学分析,发现了花粉、孢子、淡水藻类、有孔虫壁衬和甲藻囊胞等多种多样的组合。根据花粉和孢子的标记物种,这些水井的年代为中新世中期-晚期(P720-P860)。由于甲藻孢囊的定期出现,将 M6 和 M7 井的序列分别划分为 8 个和 7 个暂定甲藻孢囊集合区。拟议的尼日尔河三角洲甲藻(C-I)区分别是:Lingulodinium machaerophorum 组合区;Homotryblium spp./Sumatradinium spp.组合区;Operculodinium centrocarpum 组合区;Nematosphaeropsis labyrinthus 组合区;以及 Protoperidinium spp./Selenopemphix spp.组合区。这些边界以显著的甲藻事件为标志,如首次出现在井下或出现在最高地层,以及最后一次出现在井下或出现在最低地层,因为样本是沟渠切片。甲藻孢囊的普遍存在以及 Nematosphaeropsis labyrinthus 和 Impagidinium spp.
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引用次数: 0
Radiolarian occurrence and origin of basaltic rocks in the Hebiki Unit, Northern Chichibu accretionary complex in the Kanto Mountains, Central Japan 日本中部关东山脉北秩父增生复合体 Hebiki 单元玄武岩中放射虫的出现和起源
IF 0.7 Q4 PALEONTOLOGY Pub Date : 2024-05-18 DOI: 10.1016/j.revmic.2024.100782

Reconstructing ocean plate stratigraphy (OPS) and revealing the places of origin and ages of oceanic rocks of the Jurassic–Early Cretaceous accretionary complex in Eastern Asia are important to clarify the accretion process and the paleogeography and tectonic setting of the Panthalassa Sea during the Paleozoic to Mesozoic times. In this context, many geological investigations of the Middle Jurassic–Early Cretaceous units of the Northern Chichibu accretionary complex (except for an Early Jurassic one) and Mikabu Unit have been performed. In this study, geological mapping, faunal analysis of radiolarians, and geochemical analysis of basaltic rocks were conducted for the Hebiki Unit of the Northern Chichibu accretionary complex to obtain prime geological information such as its stratigraphy, ages, and origin of basaltic rock. The Early Jurassic Hebiki Unit consists of chaotic mélange, which contains sandstone, siliceous shale, chert, and basaltic rocks as blocks in a highly sheared shale matrix. Late Permian and Late Triassic radiolarians were newly identified from chert blocks in this study. Based on the radiolarian evidence from this study and previous ones that identified Jurassic radiolarians from siliceous shale, the OPS of the Hebiki Unit are reconstructed as follows: Upper Permian and Upper Triassic (upper Carnian to Rhaetian) chert, and Lower Jurassic (Pliensbachian) siliceous shale in ascending order. Meanwhile, the basaltic rocks of the Hebiki Unit are divided into two types in terms of the major and trace element composition and REE profiles: low and high Nb/Zr types. The low and high types are interpreted as oceanic island basalt (OIB) and mid-ocean ridge basalt (MORB), respectively. Considering the reconstructed OPS of the four tectonostratigraphic units (Kashiwagi, Kamiyoshida, Sumaizuku, and Hebiki) of the Northern Chichibu accretionary complex, the four units are considered to have accreted successively.

重建大洋板块地层(OPS),揭示东亚侏罗纪-早白垩世增生复合体大洋岩石的产地和年代,对于弄清古生代至中生代的增生过程以及泛塔拉萨海的古地理和构造环境非常重要。为此,对北秩父增生复合体的中侏罗世-早白垩世单元(早侏罗世单元除外)和米卡布单元进行了多次地质调查。本研究对北秩父增生复合体的鹤壁单元进行了地质测绘、放射虫动物群分析和玄武岩地球化学分析,以获得其地层、年龄和玄武岩产地等基本地质信息。早侏罗世的Hebiki单元由混沌混杂岩组成,其中包含砂岩、硅质页岩、燧石和玄武岩块,它们被置于高度剪切的页岩基质中。在这项研究中,从白垩岩块中新发现了二叠纪晚期和三叠纪晚期的放射虫。根据本研究和之前从硅质页岩中鉴定出的侏罗纪放射虫证据,Hebiki 单元的 OPS 重建如下:二叠系上统和三叠系上统(卡氏上统至雷特氏统)的白垩系,以及侏罗系下统(普利恩巴赫统)的硅质页岩依次递增。同时,从主要元素、微量元素组成和稀土元素分布图来看,希比基单元的玄武岩分为两种类型:低铌/锆类型和高铌/锆类型。低和高类型分别被解释为大洋岛屿玄武岩(OIB)和大洋中脊玄武岩(MORB)。考虑到北秩父增生复合体的四个构造地层单元(柏木、上吉田、须磨塾和Hebiki)的重建OPS,这四个单元被认为是先后增生的。
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