编号：CDUT-2021-58

标题：Middle Triassic lake deepening in the Ordos Basin of North China linked with global sea-level rise

入藏号：WOS:000707097700003

中国科学院文献情报中心期刊分区（升级版）：地球科学1区/TOP

本校作者：金鑫；Ogg, James G. ；Lu Gang；Shi, Zhiqiang

来源出版物：GLOBAL AND PLANETARY CHANGE  卷 207  文献号103670

出版年：2021年

第一单位：成都理工大学油气藏地质及开发工程国家重点实验室

关键词： BOUNDARY STRATOTYPE SECTION；CHANG 7 TUFF；YANCHANG FORMATION；GEOCHEMICAL CHARACTERISTICS；GEOLOGICAL SIGNIFICANCE；SEQUENCE STRATIGRAPHY；PALYNOLOGICAL RECORD；GANSU PROVINCE；SICHUAN BASIN；SOUTHERN ALPS

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摘要：The Yanchang Formation was deposited during the Middle Triassic in a vast lacustrine basin in the modern Ordos Basin and is a main target for hydrocarbon exploration in Central China. It is divided, based on sedimentary cycles and lithology, into the Chang 10 (the oldest) to Chang 1 (the youngest) members. During the deposition of the Chang 7 Member, the Ordos lake system reached its maximum depth and large volumes of organic-rich sediments were deposited. The evolution of the Ordos Basin sedimentary system during this phase is, however, not completely understood, and uncertainty still exists as for the chronostratigraphy of Chang 7 Member. We acquired palynological markers and palynofacies and a high-resolution delta 13Corg record through the entire Chang 7 Member, and a ID-TIMS 206Pb/238U date of 240.95 +/- 0.033 Ma from a volcanic ash bed in the middle of this Member. These imply that the maximum deepening phase of the lacustrine system was during the earliest Ladinian. Evidence of marine influence in the Ordos Basin at that time and comparison to the sea-level oscillations observed in Western Tethys suggest that a global eustatic rise and highstand may have played a role in determining lake-level variations.

文章链接地址： https://www.sciencedirect.com/science/article/pii/S0921818121002551?via%3Dihub