西湖凹陷平湖斜坡带平湖组碎屑锆石U-Pb年龄及米兰科维奇旋回:对源-汇系统及沉积演化的约束Detrital Zircon U-Pb Age and Milankovitch Cycles of Pinghu Formation in the Pinghu Slope of Xihu Depression: Constraints on Source-Sink System and Sedimentary Evolution
蒋一鸣;
摘要(Abstract):
西湖凹陷位于东海陆架盆地东部坳陷带,是中国近海海域最大的凹陷之一。平湖组发育的多层薄煤层和富含有机质的泥岩被认为是西湖凹陷的主力烃源岩。利用碎屑锆石U-Pb定年分析技术和地震剖面精细刻画手段,重建了西湖凹陷平湖斜坡带平湖组的源-汇系统,揭示了源区特征、运输通道、汇聚区展布,对平湖组岩心的自然伽马数据进行了旋回地层学分析,建立了该组的相对天文年代标尺,并分析了沉积速率的变化。研究表明,平湖组沉积时期具有北部、西部和东部三大源区。平湖斜坡带靠近西部源区,东部物源供给影响明显减弱。砂体从西部源区通过下切谷搬运至平湖斜坡带三大主要汇聚区。平湖组沉积持续时间约为4.64 Ma,整段平均沉积速率约为15.4 cm/ka,其垂向演化具有周期性变化的特征。
关键词(KeyWords): 西湖凹陷;平湖组;碎屑锆石U-Pb;米兰科维奇旋回;源-汇系统
基金项目(Foundation): 国家重大科技专项(201605027001)
作者(Author): 蒋一鸣;
Email:
DOI: 10.19509/j.cnki.dzkq.2019.0615
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