Late Cretaceous tectonic switch from a Western Pacific‐ to an Andean‐Type continental margin evolution in East Asia,and a foreland basin development in NE China |
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| Authors: | Feng‐Qi Zhang Yildirim Dilek Han‐Lin Chen Shu‐Feng Yang Qi‐An Meng |
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| Institution: | 1. School of Earth Sciences, Zhejiang University, Hangzhou, China;2. Structural Research Center of Oil & Gas Bearing Basin of Ministry of Education, Hangzhou, China;3. Department of Geology & Environmental Earth Science, Miami University, Oxford, OH, USA;4. Research Institute of Petroleum Exploration & Development Daqing Oilfield Co. Ltd., Daqing, China |
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| Abstract: | The early Cretaceous structure of NE China was a result of slab‐rollback‐driven extensional tectonics, characteristic of Western Pacific‐type continental margins. Oblique docking of a microcontinent along the Asian active margin in the early Late Cretaceous induced a compressional stress regime that brought about an Andean‐type continental margin development. Partitioning of contractional–transpressional strain across NE China produced a retroarc foreland basin system, comprising, from east to west, an orogenic wedge, a foredeep (Songliao basin), a forebulge (Great Xing'an Range) and a back‐bulge depozone (Hailar and Erlian basins). A sub‐circular lacustrine depozone in the pre‐existing Songliao basin evolved into a NNE‐trending depocentre near the forebulge and acquired a westward flowing fluvial–deltaic drainage system during the Campanian. Development of this retroarc foreland basin system signals a significant tectonic switch from a Western Pacific‐type to an Andean‐type continental margin evolution in the geological history of East Asia. |
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