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Sediment export from continental source areas to intra-shelf basins: Mass balancing, controls and sequence stratigraphy (Arabian Plate, Cretaceous) 大陆源区向陆架内盆地的沉积物输出:质量平衡、控制和层序地层学(阿拉伯板块,白垩纪)
IF 1 1区 地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY Pub Date : 2026-02-01 Epub Date: 2025-11-21 DOI: 10.1016/j.earscirev.2025.105339
Nikolaos Michael, Rainer Zühlke
The main objectives of this paper include a quantitative understanding of sediment supply from continental source areas to intra-shelf basins at a plate-scale, key mechanisms and a review of frequently applied propositions in clastic sequence stratigraphy studies. The Cretaceous source-to-sink system preserved on the Arabian Plate serves as test case due to the availability of a unique subsurface data base with more than 1500 wells over an area of 1700 × 1500 km. Sand front trajectories, contours of ≤10 % sand content, indicate the distal limit of coarse sediment transport on the shelf top. At plate scale, sand volumes and rates of input strongly varied with ratios of up to 14:1 between individual Cretaceous time intervals of 1.3–10 Myr each, comparable to 3rd to 2nd order durations of eustatic sea-level change. The sand front migrated up to +200 km in basin-ward and up to ‐100 km in continent-ward direction. For extended time intervals, changes in sediment input primarily controlled the pro−/retrogradation of shelf-top clastic depositional systems, not eustatic or relative sea-level changes as proposed in many sequence stratigraphic studies. The lowstand shedding concept for clastic depositional systems holds the potential for misinterpretation if continental sediment supply is assumed to be constant. Sediment trajectories are not necessarily a reliable indicator of changes in relative or eustatic sea-level. Sediment supply was controlled by structural reconfigurations in continental source areas, specifically by periodic large-scale uplift, regional block faulting and strike-slip faulting. Changes in the proportion of total clastics and in the ratio of coarse:fine clastics correlate with moderate climate changes during the Cretaceous in low-latitude areas of the Arabian Plate.
本文的主要目的包括在板块尺度上定量了解大陆源区向陆架内盆地的沉积物供应,关键机制以及对碎屑层序地层学研究中常用的主张进行综述。保存在阿拉伯板块上的白垩纪源-汇系统可以作为测试用例,因为它有一个独特的地下数据库,在1700 × 1500公里的面积上有1500多口井。砂锋轨迹(含砂量≤10%的等高线)表明陆架顶部粗沙输运的远端极限。在板块尺度上,沙粒体积和沙粒输入率在白垩纪的各个时间间隔(每个时间间隔为1.3-10 Myr)之间变化剧烈,比值高达14:1,相当于海平面上升的3 - 2阶持续时间。砂锋向盆地方向迁移了200公里,向大陆方向迁移了100公里。在较长的时间间隔内,沉积物输入的变化主要控制陆架顶部碎屑沉积体系的进退,而不是许多层序地层学研究中提出的上升或相对海平面的变化。如果假定大陆沉积物供应是恒定的,那么碎屑沉积体系的低水位脱落概念就有可能被误解。沉积物轨迹不一定是相对海平面或上升海平面变化的可靠指标。沉积物的供给受陆源区构造重塑的控制,特别是受周期性大规模隆升、区域块体断裂和走滑断裂的控制。在阿拉伯板块低纬度地区,总碎屑比例和粗、细碎屑比例的变化与白垩纪的温和气候变化有关。
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引用次数: 0
Across ancient oceans: Eocene dispersal routes of Asian terrestrial mammals to Europe, Afro-Arabia and South America 穿越古代海洋:始新世亚洲陆生哺乳动物向欧洲、非洲阿拉伯和南美洲的传播路线
IF 1 1区 地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY Pub Date : 2026-02-01 Epub Date: 2025-11-27 DOI: 10.1016/j.earscirev.2025.105352
Leny Montheil , Alexis Licht , K. Christopher Beard , Grégoire Métais , Pauline Coster , Bram Vaes , Yannick Donnadieu , Erwan Pineau , Laurent Husson , Guillaume Dupont-Nivet
During the middle and late Eocene, Asian terrestrial mammals dispersed to Europe, while primates and rodents dispersed across the 500-to-2000 km wide Neotethys Ocean and the 1500-to-2000 km wide Atlantic Ocean to colonize Afro-Arabia and South America. This study explores how these mammals have achieved such remarkable and enigmatic dispersals. We present high-resolution paleogeographic models for the middle to late Eocene based on updated plate kinematic reconstructions, paleo-bathymetry and paleo-topography data. With this, we evaluate landmass configurations and connectivity that may have facilitated faunal exchanges from Asia toward Europe, Afro-Arabia, and South America and discuss dispersal mechanisms between these biogeographic provinces. Our reconstructions reveal that during the Bartonian (∼40–38 Ma), an overland dispersal corridor between Asia and Balkanatolia became available to terrestrial mammals and acted as a pivotal pathway for Asian faunas dispersing toward western Europe and Afro-Arabia. We identified two Balkanatolian island-hopping routes across the Western Neotethys potentially enabling the dispersal of small-bodied Asian primates, rodents and artiodactyls to Afro-Arabia. Alternatively, these taxa may have rafted across the Central Neotethys. By ∼34 Ma, Balkanatolia fully connected with Western Europe, opening a southern “Grande Coupure” route for Asian faunas. In the Atlantic, we identify long-distance rafting as the most plausible mechanism for the 40–34 Ma transoceanic dispersal of the Asian-originated primates and rodents from Afro-Arabia to South America despite the likely presence of sparse islands along the Walvis Ridge and the Rio Grande Rise.
始新世中后期,亚洲陆生哺乳动物分散到欧洲,而灵长类动物和啮齿动物则分散到500- 2000公里宽的新特提斯洋和1500- 2000公里宽的大西洋,在非洲-阿拉伯和南美洲定居。这项研究探讨了这些哺乳动物是如何实现如此非凡而神秘的分散的。基于最新的板块运动学重建、古测深和古地形数据,建立了始新世中晚期的高分辨率古地理模型。在此基础上,我们评估了可能促进从亚洲到欧洲、非洲-阿拉伯和南美的动物交流的大陆配置和连通性,并讨论了这些生物地理省之间的扩散机制。我们的重建表明,在巴尔顿期(~ 40-38 Ma),亚洲和巴尔干托利亚之间的陆地传播走廊对陆地哺乳动物来说是可用的,并且是亚洲动物向西欧和非洲阿拉伯地区扩散的关键途径。我们确定了两条横跨西部新特提斯的巴尔干半岛跳岛路线,这可能使亚洲小型灵长类动物、啮齿动物和偶蹄动物向非洲阿拉伯地区扩散。另一种可能是,这些分类群漂流过尼特提斯中部。到34年前,巴尔干半岛与西欧完全连接,为亚洲动物开辟了一条通往南部的“大Coupure”路线。在大西洋,我们认为长途漂流是40-34年前亚洲灵长类动物和啮齿类动物从非洲-阿拉伯向南美洲越洋扩散的最合理的机制,尽管沃尔维斯山脊和大隆起附近可能存在稀疏的岛屿。
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引用次数: 0
Sediment routing and palaeogeographic evolution of the Western Alpine Foreland Basin during the early collisional stage 西高寒前陆盆地碰撞早期沉积路径与古地理演化
IF 1 1区 地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY Pub Date : 2026-02-01 Epub Date: 2025-11-28 DOI: 10.1016/j.earscirev.2025.105337
Bastien Huet , Eric Lasseur , Nicolas Bellahsen , Justine Briais , Nicolas Loget , Jean-Pierre Suc , Jean-Loup Rubino , Matthias Bernet , Speranta-Maria Popescu
In the Western Alpine Foreland Basin (WAFB), Late Eocene and Miocene periods were characterized by longitudinal sediment routing systems: The first one was situated within the turbidite basin during the underfilled phase and exhibited a northward orientation toward the Swiss Basin, whereas the second was located in the Rhône Valley during the overfilled phase and was directed southward toward the Mediterranean Sea. The transition between these two periods occurred during the Oligocene, which corresponds to both the underfilled/overfilled transition and the early overfilled period. In this study, we provide new fieldwork observations, seismic and well data interpretations, biostratigraphic analyses and a literature synthesis to reconstruct the palaeogeographic and source-to-sink evolution of the WAFB from Priabonian to Aquitanian. The aim is to discuss this reorganisation of sediment routing in relation to the evolution of the Alpine orogenic wedge, as well as the structural inheritance and the suite of geodynamic events that affected southeastern France during the mid-Cenozoic. We divided the WAFB sedimentary formations into four depositional sequences (S1 to S4). During the deposition of the first two sequences (Priabonian to early late Rupelian; ∼37.4–28.8 Ma), the WAFB routing system was influenced by the end of the Pyrenean-Provençal orogeny, the European Cenozoic Rifting System (controlling the Rhône Valley s.l.) and the Alpine orogenic wedge (controlling the Alpine foredeep). The very first connection between the Alpine domain and the Rhône Valley is established at ∼30 Ma, during the late Rupelian (S2 highstand), controlled by E-W inherited Pyrenean-Provençal structures implying a ‘broken foreland’. In the meanwhile, from the Dévoluy Basin and northward, the orogenic wedge controlled a classical, although thin, foreland basin characterized by a northward sediment routing connected to the Northern Alpine Foreland Basin. Most of the S3 sequence (Latest Rupelian to middle Chattian; ∼28.8–23.25 Ma) corresponds to a decrease of clastic Alpine inputs throughout SE France caused by a reorganisation of the drainage network related with the exhumation of the southern External Crystalline Massifs. S3 highstand and S4 sequence (late Chattian to Aquitanian; from ∼23.25 Ma) correspond to the establishment of a longitudinal sediment routing system in the Rhône Valley, with material flowing southwards toward the Gulf of Lion, and supplied by the Palaeo-Isère to the north and potentially by the Palaeo-Durance to the south. This final stage in the reorganisation of the drainage network is clearly associated with the post-rift phase of the Gulf of Lion, which facilitated the opening of a new sink and the ultimate southward migration of the sedimentary area.
西阿尔卑斯前陆盆地晚始新世至中新世发育纵向沉积路线体系:第一个沉积路线体系位于欠填期浊积岩盆地内,向北走向瑞士盆地;第二个沉积路线体系位于过填期Rhône山谷内,向南走向地中海。这两个时期的过渡发生在渐新世,对应于欠充/过充过渡和早期过充时期。在这项研究中,我们提供了新的野外观测、地震和井资料解释、生物地层分析和文献综合,以重建从Priabonian到Aquitanian的WAFB的古地理和源-汇演化。目的是讨论与阿尔卑斯造山带楔块演化有关的沉积物路线重组,以及在中新生代期间影响法国东南部的构造继承和一系列地球动力学事件。将wab沉积组划分为S1 ~ S4 4个沉积层序。在前两个层序(Priabonian - late Rupelian; ~ 37.4-28.8 Ma)的沉积过程中,wab路线系统受到比利牛斯-普罗旺造山运动末期、欧洲新生代裂陷体系(控制Rhône山谷s.l)和阿尔卑斯造山楔(控制阿尔卑斯前深)的影响。阿尔卑斯地区和Rhône山谷之间的第一个联系建立于~ 30 Ma,在鲁比利良晚期(S2高地),由东西向继承的比利牛斯-普罗旺构造控制,这意味着一个“破碎的前陆”。与此同时,从dsamuvolume盆地向北,造山楔控制了一个典型的薄前陆盆地,其特征是向北的沉积路线与北阿尔卑斯前陆盆地相连。大部分S3层序(最新鲁伯利世至中Chattian; ~ 28.8-23.25 Ma)对应于法国东南部阿尔卑斯碎屑输入的减少,这是由南部外部结晶地块的发掘引起的排水网络重组引起的。S3高地和S4层序(晚Chattian - Aquitanian;从~ 23.25 Ma)对应于Rhône山谷纵向沉积路线体系的建立,物质向南流向狮子湾,北部由古is提供,南部可能由古杜兰斯提供。这一排水网络重组的最后阶段显然与狮子湾后裂谷期有关,这一阶段促进了新汇的打开和沉积区最终向南迁移。
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引用次数: 0
Late Paleozoic tetrapods in eastern Pangaea: when and how did they get there? 泛大陆东部的晚古生代四足动物:它们是何时以及如何形成的?
IF 1 1区 地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY Pub Date : 2026-02-01 Epub Date: 2025-11-27 DOI: 10.1016/j.earscirev.2025.105344
Vladimir I. Davydov , Spencer G. Lucas , Eugeny V. Karasev , Yunus Mamadzhanov , Mark D. Schmitz
The distribution and dispersal patterns of Late Paleozoic tetrapods remain poorly constrained. Diverse assemblages of Carboniferous and Permian tetrapods are well documented across western Pangaea, whereas in eastern Pangaea (east of the Ural seaway), tetrapods only become abundant from the mid-Permian onwards. It is unclear whether this discrepancy reflects imprecise chronostratigraphy or a genuine absence of Carboniferous–Early Permian tetrapods in eastern Pangaea. Recently proposed vicariance models of tetrapod evolution incorporate several questionable datasets, and existing palaeogeographic reconstructions of western–eastern Pangaean connections remain controversial, requiring improved constraints and documentation. We report a CA–IDTIMS radioisotopic age of 292.14 ± 0.14 Ma (Sakmarian) from one of the earliest tetrapods (discosauriscid) in the East Pangaea localities in Tajikistan, that closely resembles discosauriscid assemblages from Kazakhstan. This age supports the recently proposed model for the development of the Precaspian Isthmus during the Asselian–Sakmarian transition, interpreted as the first terrestrial corridor enabling tetrapod dispersal from western to eastern Pangaea. Integrated analyses of regional paleogeography, tectonics, palaeoclimate, palaeobiogeography, palaeofacies, and heavy-mineral provenance indicate that tetrapod migration pathways evolved through time: the initial eastward dispersal occurred via the Precaspian Isthmus during the Asselian–Sakmarian transition, whereas subsequent migrations (late Kungurian, late Roadian, Wuchiapingian, and Changhsingian) proceeded both directly eastward from the East European Platform and through recurrent connections across the Precaspian corridor.
晚古生代四足动物的分布和扩散模式仍然很不清楚。石炭纪和二叠纪四足动物的不同组合在整个盘古大陆西部得到了很好的记录,而在盘古大陆东部(乌拉尔海道以东),四足动物从二叠纪中期开始才大量出现。目前尚不清楚这种差异是反映了不精确的年代地层,还是反映了盘古大陆东部石炭纪-早二叠世四足动物的真正缺失。最近提出的四足动物进化的变异模型包含了一些有问题的数据集,现有的泛古大陆西部-东部连接的古地理重建仍然存在争议,需要改进约束和文献。我们报告了在塔吉克斯坦东盘古大陆地区发现的最早的四足动物(dissauriscid)的CA-IDTIMS放射性同位素年龄为292.14±0.14 Ma(萨克纪),与哈萨克斯坦的dissauriscid组合非常相似。这个时代支持了最近提出的亚塞利亚-萨克森过渡时期里海地峡发展的模型,该模型被解释为使四足动物从盘古大陆西部向东部扩散的第一个陆地走廊。区域古地理、构造、古气候、古生物地理、古相、重矿物物源等综合分析表明,四足动物的迁徙路径是随时间演化的:最初的向东扩散发生在亚塞利亚-萨克森过渡期间,通过里海地峡,而随后的迁移(晚昆古里亚、晚路迪亚、乌恰平和长兴期)既直接从东欧地台向东,又通过穿越里海走廊的循环连接。
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引用次数: 0
Petrogenetic interpretation of Archean low δ18O zircon: Implications for origin of continental crust on early Earth 太古宙低δ18O锆石成因解释:对早期地球大陆地壳成因的启示
IF 1 1区 地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY Pub Date : 2026-02-01 Epub Date: 2025-12-15 DOI: 10.1016/j.earscirev.2025.105370
Yong-Fei Zheng
The origin of Archean continental crust remains a critical yet unresolved question in the evolution of early Earth, closely tied to debates on the emergence of plate tectonics. This review focuses on the petrogenesis of Archean tonalite-trondhjemite-granodiorite (TTG) suites and the origin of low δ18O values (1.0–2.7 ‰) observed in Hadean to Archean zircons, which challenge conventional interpretations involving meteoric water interaction. By integrating zircon U-Pb ages and O isotope data with the thermodynamic principle of stable isotope geochemistry (equilibrium O isotope fractionations between basaltic rock and water converge to 0 ± 1 ‰ at high temperatures of >400 °C), it is demonstrated that these low δ18O signatures would originate from high-temperature seawater-hydrothermal alteration of the juvenile basaltic crust at mid-ocean ridges, rather than meteoric water involvement. Even if the low δ18O signature could exist in the felsic crust on early Earth, the formation of low δ18O rocks would necessitate a three-stage mechanism. The first is the O isotope exchange between seawater and thick (30–40 km) basaltic crust along mid-ocean ridges during plate divergence, the second is the collisional thickening of the juvenile crust to 60–80 km during plate convergence, and the third is the partial melting of the hydrated, ultrathick basaltic crust during lithospheric rifting to produce TTG magmas in the post-convergent stage. The lithospheric rifting is induced by upwelling of the asthenospheric mantle in response to foundering of the lithospheric mantle. This three-stage model for the petrogenesis of Archean TTG rocks keeps pace with an ancient Wilson cycle at high Archean mantle temperatures, emphasizing divergent-convergent plate coupling and lithospheric rifting in response to poloidal mantle convection. It argues against subduction-driven TTG magmatism but affirms the operation of ancient plate tectonics through the water-rock interaction during the seafloor spreading and then the crustal anatexis due to the asthenospheric upwelling consequential to the lithospheric foundering. Therefore, the low δ18O zircon growth is linked to the high-temperature seawater-hydrothermally altered sources at divergent plate margins, and the TTG generation is attributed to the post-collisional reworking at convergent plate margins. This results in a holistic model for the growth of Archean continental crust and the geodynamic regime of early Earth. As such, the petrogenesis of Archean TTG rocks witnesses the operation of ancient plate tectonics at that time.
太古宙大陆地壳的起源一直是早期地球演化中一个关键但尚未解决的问题,与板块构造论的出现密切相关。本文综述了太古宙闪长岩-闪长岩-花岗闪长岩(TTG)套的岩石成因,以及冥古宙至太古宙锆石低δ18O值(1.0 ~ 2.7‰)的成因,对传统的大气水相互作用解释提出了挑战。结合稳定同位素地球化学热力学原理(玄武岩与水之间的平衡O同位素分异在400℃高温下趋于0±1‰),综合锆石U-Pb年龄和O同位素数据,认为这些低δ18O特征来源于洋中脊幼玄武岩地壳的高温海水-热液蚀变,而非大气水的参与。即使低δ18O特征在地球早期的长英质地壳中存在,低δ18O岩石的形成也需要一个三阶段机制。一是板块辐散期海水与洋中脊厚(30-40 km)玄武质地壳O同位素交换,二是板块辐合期幼体地壳碰撞增厚至60-80 km,三是岩石圈裂陷期水合超厚玄武质地壳部分熔融,在辐合后阶段产生TTG岩浆。岩石圈裂陷是由岩石圈地幔沉降引起的软流圈地幔上涌引起的。这一太古宙TTG岩石成因的三阶段模型与太古宙高地幔温度下的古威尔逊旋回保持同步,强调了板块辐散-收敛耦合和岩石圈裂陷对极向地幔对流的响应。它否定了俯冲驱动的TTG岩浆作用,但肯定了古代板块构造的作用是通过海底扩张过程中的水-岩相互作用,以及岩石圈沉降后软流圈上涌引起的地壳融合作用。因此,低δ18O锆石的生长与发散型板块边缘的高温海水热液蚀变源有关,TTG的产生与辐合型板块边缘的碰撞后改造有关。由此建立了太古宙大陆地壳生长和早期地球动力学机制的整体模型。因此,太古宙TTG岩的成岩作用见证了当时古板块构造的作用。
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引用次数: 0
A synthesis of biostratigraphic, isotope-stratigraphic, and paleoenvironmental records from the Callovian (Middle Jurassic) carbonate succession of Saudi Arabia and its global implications 沙特阿拉伯加洛世(中侏罗世)碳酸盐岩演替的生物地层、同位素地层和古环境记录综合及其全球意义
IF 1 1区 地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY Pub Date : 2026-02-01 Epub Date: 2025-11-28 DOI: 10.1016/j.earscirev.2025.105350
Jihede Haj Messaoud , Sayed Hassan Majed Alsaihati , Najeh Ben Chaabane , Philippe Razin , Frans van Buchem
The Middle Jurassic Callovian Stage (∼165.2–160.8 Ma) represents a pivotal interval in Earth’s history marked by climate change, both warming and cooling (glacio-eustasy), widespread organic matter accumulation, and perturbations in the carbon cycle. On the Arabian Plate, this stage witnessed the initiation of intrashelf basins, large-scale coral–stromatoporoid reef growth, and a glacio-eustatic sea level fluctuation. Detailed global reconstructions are, however, hindered by discontinuous stratigraphic records, significant hiatuses, and a lack of integrated datasets. Here we present a synthesis of sedimentological, biostratigraphic, chemostratigraphic, and paleoenvironmental data from a well preserved and extended (290 m thick) carbonate-dominated Callovian succession in Saudi Arabia, which is continuously exposed along a >1000 km long escarpment. We integrate legacy datasets of dispersed reports and theses, produced during the mapping campaigns in the 1980s–1990s, with reinterpreted published carbon-isotope curves and a new sedimentological section, with refined calcareous nannofossil biostratigraphy, using modern taxonomy, standardized biozonation, and a Bayesian age model. The C-isotope curve shows an early Callovian positive δ13C excursion in the upper part of the gracilis Ammonoid Zone, followed by a negative shift at the base of the anceps Zone coinciding with siliciclastic influx from the Arabian shield. δ13C values rise through the Middle Callovian global warming with enhanced organic carbon burial on the Arabian Plate. The late Callovian cooling phase records extensive coral–stromatoporoid bioherms terminated by a sea-level fall near the Callovian–Oxfordian boundary. This work establishes the Arabian Plate as a key northern Gondwanan reference point for Callovian chronostratigraphy and calibration of global paleoceanographic, depositional, and climatic trends.
中侏罗世加洛世阶段(~ 165.2 ~ 160.8 Ma)是地球历史上的一个关键时期,其特征是气候变化,包括变暖和变冷(冰川期-游动期)、广泛的有机质积累和碳循环的扰动。在阿拉伯板块,这一阶段见证了陆架内盆地的形成,大规模的珊瑚-叠层孔状礁的生长,以及冰川-海平面上升的波动。然而,详细的全球重建受到不连续地层记录、重大中断和缺乏综合数据集的阻碍。在这里,我们综合了沉积学、生物地层学、化学地层学和古环境数据,这些数据来自于沙特阿拉伯一个保存完好的、延伸的(290米厚)碳酸盐岩为主的Callovian演化系,该演化系沿着一条1000公里长的断崖连续暴露。我们整合了在20世纪80年代至90年代的制图活动中产生的分散报告和论文的遗留数据集,重新解释了已发表的碳同位素曲线和新的沉积学剖面,使用现代分类学,标准化生物分带和贝叶斯年龄模型,使用精细的钙质纳米化石生物地层学。c -同位素曲线显示,早callo世在股薄氨带上部出现正δ13C偏移,随后在羚羊带底部出现负偏移,与阿拉伯地盾的硅屑流入相吻合。中嘉禄世全球变暖期间δ13C值上升,阿拉伯板块有机碳埋藏增强。晚卡洛纪冷却期记录了广泛的珊瑚-叠层孔生物礁,在卡洛纪-牛津纪边界附近的海平面下降终止。这项工作建立了阿拉伯板块作为一个关键的冈瓦纳北部参考点,用于Callovian年代地层学和校准全球古海洋学,沉积和气候趋势。
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引用次数: 0
Alkaline magmatism in the Southern Granulite Terrane, India: Insights into Precambrian tectonics and mantle evolution 印度南部麻粒岩地体的碱性岩浆作用:对前寒武纪构造和地幔演化的启示
IF 1 1区 地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY Pub Date : 2026-02-01 Epub Date: 2025-12-09 DOI: 10.1016/j.earscirev.2025.105364
M.R. Nandu , Y. Anilkumar , M. Santosh , Cheng-Xue Yang , Sung Won Kim , A.P. Pradeepkumar , M.P. Manu Prasanth , A.S. Amrutha
Alkaline magmatism through space and time over the globe has contributed significantly to crustal growth and the formation of important rare metal and rare earth reserves. The Southern Granulite Terrane (SGT) in India is an important archive of Proterozoic alkaline complexes that are largely unmetamorphosed and undeformed, occurring as linear chains aligned along crustal-scale paleo-suture zones or major transcrustal faults. These alkaline magmatic suites include syenites, carbonatites, nepheline syenites, alkali granites and lamprophyres occur as ring complexes, individual plutons, intrusive lenses, dykes, and plugs. Here we present a comprehensive overview of the occurrence, petrology, geochemistry, and geochronology of seventeen alkaline magmatic suites, highlighting their petrogenetic significance and geodynamic implications. The Proterozoic alkaline magmatism in the Southern Granulite Terrane is marked by three distinct phases: an early Paleoproterozoic episode (∼2498–2340 Ma), a mid-Neoproterozoic episode (∼830–720 Ma), and a late Neoproterozoic (∼620–572 Ma). These alkaline magmatic suites exhibit variable morphologies, with some of the Cryogenian alkaline–carbonatite complexes occurring as ring or crescent-shaped structures. Carbonatites, unlike associated alkaline silicate and ultramafic rocks, display markedly steeper rare earth element (REE) patterns and pronounced LREE/HREE fractionation, consistent with derivation from low-degree partial melting of a mantle source. The majority of δ18O and δ13C values for the Southern Granulite Terrane carbonatites fall within the field of primary mantle-derived carbonatites. Radiogenic SrNd isotopic signatures show a temporal trend toward more enriched compositions from the Paleoproterozoic to the Neoproterozoic, reflecting progressive geochemical evolution of the source mantle through time. The Sr–Nd–Pb–C–O isotopic compositions of these alkaline rocks and carbonatite indicate the involvement of compositionally heterogeneous mantle domains beneath the Southern Granulite Terrane. Field relationships, along with mineralogical and isotopic data, suggest that syenites, carbonatites, and pyroxenites were emplaced as discrete magmatic intrusions derived from compositionally distinct sources, rather than representing derivatives of a single parental melt. The alkaline rocks and carbonatites exhibit post-collisional geochemical signatures and isotopic evidence for source heterogeneity, consistent with an extensional tectonic regime. Prolonged extension likely facilitated lithospheric thinning, promoting asthenospheric upwelling and decompression melting of a metasomatized lithospheric mantle. These magmas subsequently interacted with subduction-modified lithospheric components of varying ages, producing compositionally diverse melts that were emplaced as shallow-level intrusions along major crustal-scale suture zones.
在全球范围内,碱性岩浆活动贯穿时空,对地壳生长和重要稀有金属和稀土储量的形成作出了重大贡献。印度南部麻粒岩地体(SGT)是一个重要的元古代碱性杂岩档案,这些杂岩基本上是未变质和未变形的,沿地壳尺度古缝合带或主要跨地壳断裂呈线性链排列。这些碱性岩浆套装包括正长岩、碳酸岩、霞石正长岩、碱性花岗岩和煌斑岩,它们以环状杂岩体、单个岩体、侵入透镜体、岩脉和岩塞的形式出现。本文全面介绍了17个碱性岩浆套的产状、岩石学、地球化学和年代学,强调了它们的成岩意义和地球动力学意义。南麻粒岩地体元古代碱性岩浆作用可分为三个阶段:古元古代早期阶段(~ 2498 ~ 2340 Ma)、新元古代中期阶段(~ 830 ~ 720 Ma)和新元古代晚期阶段(~ 620 ~ 572 Ma)。这些碱性岩浆组表现出不同的形态,一些低温系碱性碳酸盐岩复合体呈环状或新月形结构。与伴生的碱性硅酸盐和超镁质岩石不同,碳酸盐岩显示出明显陡峭的稀土元素(REE)模式和明显的LREE/HREE分馏,与地幔源低程度部分熔融的衍生相一致。南麻粒岩地系碳酸盐岩的δ18O和δ13C值大部分落在原生幔源碳酸盐岩范围内。放射性成因的SrNd同位素特征显示,从古元古代到新元古代,源区的化学成分逐渐富集,反映了源区地幔的地球化学演化过程。这些碱性岩和碳酸盐岩的Sr-Nd-Pb-C-O同位素组成表明南麻粒岩地体下存在成分不均匀的地幔域。现场关系以及矿物学和同位素数据表明,正长岩、碳酸岩和辉石岩是由不同成分来源的岩浆侵入体形成的,而不是单一母质熔体的衍生物。碱性岩和碳酸盐岩具有碰撞后地球化学特征和物源非均质性的同位素证据,符合伸展构造制度。延长的伸展可能促进了岩石圈变薄,促进了软流圈上涌和交代岩石圈地幔的减压融化。这些岩浆随后与不同年代的俯冲修正岩石圈成分相互作用,产生了成分多样的熔体,这些熔体沿着主要的地壳尺度缝合带作为浅层侵入体侵位。
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引用次数: 0
Serpentinization-mediated H2-generation and its genesis link to supra-subduction zone ophiolites 蛇纹岩介导的h2生成及其与超俯冲带蛇绿岩的成因联系
IF 1 1区 地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY Pub Date : 2026-02-01 Epub Date: 2025-12-19 DOI: 10.1016/j.earscirev.2025.105369
Xiaomei Wang , Zhichao Yu , Pingchang Sun , Ziming Zhang , Kun He , Shuichang Zhang , Zhijun Jin
Natural hydrogen, a pivotal alternative energy source for achieving net-zero carbon emissions, has attracted considerable global interest. It is generated by multiple geological processes, of which the serpentinization of Fe(II)-rich rocks is a well-established primary source of natural hydrogen. Large ophiolite complexes associated with supra-subduction zone (SSZ) processes represent major geological reservoirs of Fe(II) on Earth. In this review, we systematically examine the spatiotemporal distribution, hydrogen-generating lithology and mineral assemblages, and geochemical characteristics of hydrogen-generating rock units in SSZ-type ophiolites with high natural hydrogen contents distributed around the Neo-Tethys realm. The results identify three key geological features associated with natural hydrogen accumulation in SSZ-type ophiolites: (1) the dominant hydrogen-generating lithology assemblage consists of harzburgite, dunite and lherzolite; (2) the upper ophiolite lavas unit is characterized by extreme enrichment in albite, depletion in K-feldspar, exhibiting the immobile element patterns of normal mid-ocean ridge basalt (N-MORB) with high Th/Nb ratios, deriving from a depleted mantle source; (3) the lower mantle peridotites unit exhibits a CIPW normative mineral composition marked by a W-shaped distribution of forsterite, fayalite, enstatite, and ferrosilite. The upper rock units of the ophiolite complexes, sealed by deep-sea sediments, pillow lavas, and dolerite/gabbroic dykes, are considered the most favorable structural position for natural hydrogen accumulation. The geological framework established in this review represents a significant advancement in the precise identification of SSZ-type ophiolite complexes, expands the potential frontiers for natural hydrogen exploration, and provides a scientific foundation for the scalable and economic recovery of natural hydrogen resources.
天然氢作为实现净零碳排放的关键替代能源,已经引起了全球的广泛关注。它是由多种地质作用产生的,其中富铁(II)岩石的蛇纹石化作用是公认的天然氢的主要来源。与超俯冲带(SSZ)作用有关的大型蛇绿岩杂岩是地球上主要的铁(II)地质储层。本文系统研究了新特提斯地区高天然含氢ssz型蛇绿岩的时空分布、生氢岩性和矿物组合以及生氢岩单元的地球化学特征。结果确定了ssz型蛇绿岩天然成氢的3个关键地质特征:(1)主要产氢岩性组合为辉锌矿、灰锌矿和辉锌矿;(2)上部蛇绿岩熔岩单元以钠长石极度富集、钾长石极度亏缺为特征,表现出高Th/Nb比的正常洋中脊玄武岩(N-MORB)的不动元素模式,来源于枯竭的地幔源;(3)下地幔橄榄岩单元的矿物组成符合CIPW标准,由橄榄石、铁长辉石、辉长辉石和硅铁铁矿组成。蛇绿岩杂岩的上部岩石单元被深海沉积物、枕状熔岩和玄武岩/辉长岩墙所封闭,被认为是天然氢气聚集最有利的构造位置。本文建立的地质格架在精确识别ssz型蛇绿岩杂岩方面取得了重大进展,拓展了天然氢勘探的潜在领域,为大规模经济开采天然氢资源提供了科学依据。
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引用次数: 0
Ecohydrological and geomorphological importance of glacial lakes 冰川湖的生态水文和地貌重要性
IF 1 1区 地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY Pub Date : 2026-02-01 Epub Date: 2025-12-02 DOI: 10.1016/j.earscirev.2025.105356
Taigang Zhang , Weicai Wang , Adam Emmer , Gang Jin , Keshao Liu , Baosheng An , Tandong Yao
Rapidly expanding glacial lakes are transforming cryospheric, hydrologic, ecologic, and societal dynamics worldwide. They affect water resources, hydropower, sediment transport, and carbon cycles while also being influenced by the increased instability and interactions with their surroundings due to global warming. Here, we present a state-of-the-art synthesis on glacial lakes, focusing on their ecohydrological and geomorphological importance. First, warming-driven deglaciation is inducing extensive glacial lake expansion, enhancing freshwater storage capacity and hydropower potential. Sediment-rich meltwater promotes underwater weathering, positioning glacial lakes as important yet underrecognized carbon sinks, with a preliminary global carbon consumption flux estimated at over 0.26 Tg C-CO2 yr−1. Second, glacial lakes profoundly reshape high mountain landscapes by acting as sediment sinks, drivers of catastrophic sediment transport events, and modulators of cascading hazards. They trap sediment fluxes from glacier-fed systems, creating long-term geological archives and influencing downstream geomorphology. Extreme lake outbursts can mobilize vast quantities of sediment, dramatically altering river networks, floodplains, and valley morphology. Moreover, interactions between expanding proglacial lakes, retreating and calving glaciers, and unstable ice-rich moraine dams heighten geomorphic instability under ongoing warming, increasing the susceptibility of lake outbursts. Overall, glacial lakes can significantly affect geomorphic evolution, biogeochemical cycles, and socioeconomic activities in the surrounding areas up to tens of kilometers downstream. Future research requires systematic field planning and monitoring to reveal these critical interactions and improve local risk management.
迅速扩大的冰川湖泊正在改变世界范围内的冰冻圈、水文、生态和社会动态。它们影响着水资源、水电、泥沙运输和碳循环,同时也受到全球变暖导致的不稳定性增加和与周围环境相互作用的影响。在这里,我们提出了一个最先进的冰川湖综合,重点是他们的生态水文和地貌学的重要性。首先,全球变暖导致的冰川消融导致冰湖大面积扩张,增强了淡水储存量和水电潜力。富含沉积物的融水促进了水下风化,将冰川湖定位为重要的但尚未得到充分认识的碳汇,初步估计全球碳消耗通量超过0.26 Tg C-CO2 yr - 1。其次,冰川湖作为沉积物汇、灾难性沉积物运输事件的驱动因素和级联灾害的调节器,深刻地重塑了高山景观。它们捕获了冰川补给系统的沉积物通量,形成了长期的地质档案,并影响了下游的地貌。极端的湖泊爆发可以调动大量的沉积物,极大地改变河网、洪泛平原和山谷的形态。此外,扩大的前冰期湖泊、退缩和崩解的冰川以及不稳定的富冰碛垄之间的相互作用加剧了持续变暖下地貌的不稳定性,增加了湖泊溃决的易感性。总体而言,冰湖可以显著影响下游数十公里范围内周边地区的地貌演化、生物地球化学循环和社会经济活动。未来的研究需要系统的实地规划和监测,以揭示这些关键的相互作用并改善当地的风险管理。
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引用次数: 0
Borehole geophysical studies in glaciers. Part I: Borehole logging 冰川的钻孔地球物理研究。第一部分:钻孔测井
IF 1 1区 地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY Pub Date : 2026-02-01 Epub Date: 2025-12-03 DOI: 10.1016/j.earscirev.2025.105357
Pavel G. Talalay , Nan Zhang , Xiaopeng Fan , Yazhou Li , Da Gong , Bing Li
Glaciers including ice sheets, ice caps, and mountain glaciers cover more than 10 % of the Earth's land area. Borehole drilling in glaciers serves a wide range of scientific purposes, such as the evolution of the Earth's climate and environment, formation and movement of snow and ice, impact of glacial phenomena on landscapes, subglacial environment, and so on. Geophysical logging is a crucial component of most ice-drilling projects, providing valuable in-situ data on the physical and structural properties of the natural snow and ice surrounding the borehole. These properties include temperature, density, creep parameters, optical characteristics, visual stratigraphy, and subglacial electrical resistivity. However, conventional geophysical logging techniques are often not suitable for ice due to its distinct physical properties. Over the past six decades, specialized downhole tools—such as light-emitting loggers and optical televiewers—have been developed to image borehole walls and resolve stratigraphy at resolutions comparable to those of ice core analysis. These advanced methods bridge ice-core data with regional glaciological parameters, such as ice flow dynamics and geothermal heat flux. This paper provides an overview of current and emerging borehole logging techniques and their applications in glacier research, while a subsequent paper discusses long-term in-situ borehole observatories.
包括冰盖、冰帽和高山冰川在内的冰川覆盖了地球陆地面积的10%以上。冰川钻孔具有广泛的科学用途,如地球气候和环境的演变、冰雪的形成和运动、冰川现象对景观的影响、冰下环境等。地球物理测井是大多数冰钻项目的重要组成部分,它提供了有关井眼周围天然冰雪的物理和结构特性的宝贵现场数据。这些属性包括温度、密度、蠕变参数、光学特征、可视地层和冰下电阻率。然而,由于冰具有独特的物理性质,传统的地球物理测井技术往往不适用于冰。在过去的60年里,专门的井下工具(如发光记录仪和光学电视)已经被开发出来,用于成像井壁,并以与冰芯分析相当的分辨率来解析地层。这些先进的方法将冰芯数据与区域冰川参数(如冰流动力学和地热热通量)联系起来。本文概述了当前和新兴的钻孔测井技术及其在冰川研究中的应用,随后的论文讨论了长期的原位钻孔观测。
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Earth-Science Reviews
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