| Griesbachian Cyclostratigraphy at MajiashanSection, Anhui Province, China |
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| 作者姓名： | Peng Yuanqiao Tong Jinnan Faculty of Earth Sciences China University of Geosciences Wuhan Gao Yongqun China University of Geosciences Press Wuhan |
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| 作者单位： | Peng Yuanqiao Tong Jinnan Faculty of Earth Sciences，China University of Geosciences，Wuhan 430074 Gao Yongqun China University of Geosciences Press，Wuhan 430074 |
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| 基金项目： | the National Natural Science Founda-
tion of China (No. 49632070). |
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| 摘 要： | INTRODUCTIONAs a large regression continued over the world at the endof the Paleozoic, a new remarkable transgression was intrudinginto the Lower Yangtze located in the eastern Tethys duringthe Late Permian, resulting in many excellent continuous marine Permian-Triassic sequences in this region. But the middleTriassic indosinian movement transformed this region from marine to continental factes, resulting in the deposition of theLower Triassic in the marked regression setting prior to …
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Griesbachian Cyclostratigraphy at Majiashan Section, Anhui Province, China |
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| Peng Yuanqiao Tong Jinnan Faculty of Earth Sciences,China University of Geosciences,Wuhan Gao Yongqun China University of Geosciences Press,Wuhan .Griesbachian Cyclostratigraphy at MajiashanSection, Anhui Province, China[J].Journal of China University of Geosciences,2001,12(1). |
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| Authors: | PENG Yuanqiao Tong Jinnan Gao Yongqun |
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| Abstract: | The Lower Triassic at Majiashan Section, deposited in the deep part of the Lower Yangtze carbonate ramp, is the only outcrop of the deep Lower Triassic preserved in the present Lower Yangtze region. Even so, the alternations of mudrock of mudrock and marl (or limestone) are still very distinct and recognizableable, though usually more or less condensed. The lithological and geochemical cycles at Majiashan Section are discussed in terms of the sedimentary characters and the contents of some elements analyzed at a 2-centimeter-interval with no hiatus of the Lower Triassic. The division resolution of the Griesbachian stratigraphy may increase to the scale of ten thousand years by the mudrock-marl (or limestone) bundles and the geochemical cycles. The analysis of the relationship between the sedimentary cycles/the geochemical cycles and the Milankovitch cycles may suggest the time limit and the sedimentary rates. |
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| Keywords: | Majiashan Section Griesbachian sedimentary bundles geochemical characters Milankovitch cycles |
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