Evolution of a plume-influenced source-to-sink system: An example from the coupled central Emeishan large igneous province and adjacent western Yangtze cratonic basin in the Late Permian, SW China
Evolution of a plume-influenced source-to-sink system: An example from the coupled central Emeishan large igneous province and adjacent western Yangtze cratonic basin in the Late Permian, SW China
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DOI：
10.1016/j.earscirev.2020.103224
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发表时间：
2020-08
影响因子：
12.1
通讯作者：
Xuetian Wang;L. Shao;K. Eriksson;Zhiming Yan;Jumin Wang;Hui Li;R. Zhou;Jing Lu
中科院分区：
文献类型：
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作者：
Xuetian Wang;L. Shao;K. Eriksson;Zhiming Yan;Jumin Wang;Hui Li;R. Zhou;Jing Lu
为揭示地幔柱影响下的晚二叠世盆地演化过程，在时间约束的层序地层格架中，对扬子西缘晚二叠世乐平期和峨眉山大火成岩省内带非海相-海相过渡地层进行了源-汇古地理重建。乐平期含煤地层可划分为17个四级层序和3个三级复合层序，代表67.6 Myr。古地理重建表明，在远离ELIP中心的区域内，存在由西向东分布的南北向陆相、过渡相和海相带。地貌分析表明，源区的西边界与中央ELIP隆起的长轴重合。根据沉积通量估计和建模（BQART模型），中央ELIP的救济增加，从近海平面在最早的晚二叠世，并达到平衡，在约200米的最晚二叠世。沉积物体积分析表明，晚二叠世ELIP中部的总构造抬升超过500 m。耦合的中央ELIP和WYCB的演化可以划分为三个阶段，即爆发前的隆起阶段，爆发前和同时期的沉降阶段，同时期和爆发后的隆起阶段。火山爆发后盆地充填受沉积物供给控制，沉积物供给与构造抬升、流域地形和气候变化有关，盆地可容纳空间与海平面波动和地幔柱引起的同沉积构造有关。
Source-to-sink paleogeography in a time-constrained sequence stratigraphic framework has been reconstructed for the non-marine to marine transitional Lopingian strata (Late Permian) in the western Yangtze Cratonic Basin (WYCB) and the adjacent inner zone of the Emeishan large igneous province (ELIP) in order to reveal the evolution of a mantle plume influenced cratonic basin. The Lopingian coal-bearing strata can be subdivided into seventeen 4th-order sequences and three 3rd-order composite sequences representing 6.76 Myr. Paleogeographic reconstructions of the WYCB demonstrate the existence of N-S trending terrestrial, transitional and marine facies belts distributed west to east away from the central ELIP. Geomorphological analysis indicates that the western boundary of the source area coincided with the major axis of the uplifted central ELIP. Based on sediment flux estimates and modeling (BQART model), relief of the central ELIP increased from near sea-level in the earliest Late Permian and reached equilibrium at about 200 m in the latest Permian. Sediment volume backfilling analysis indicates that total tectonic uplift of the central ELIP in the Late Permian was more than 500 m. Evolution of the coupled central ELIP and WYCB can be subdivided into three stages, pre-eruptive uplift stage, pre- and syn-eruptive subsidence stage, and syn- and post-eruptive uplift stage. Post-eruptive basin filling was controlled by sediment supply that was related to tectonic uplift, drainage topography and climate change, and basin accommodation that was related to sea-level fluctuations and plume-induced syn-sedimentary tectonics.