东海陆架盆地龙井运动构造影响及其发育背景  

Longjing Movement structural effect and developmental background in East China Sea Basin

作　　者：郭真[1] 刘池洋[1] 田建锋[2] 

机构地区：[1]西北大学大陆动力国家重点实验室/地质学系,陕西西安710069 [2]西安石油大学地球科学与工程学院,陕西西安710065

出　　处：《西北大学学报（自然科学版）》2015年第5期801-810,共10页Journal of Northwest University（Natural Science Edition）

基　　金：国家科技重大专项基金资助项目(2011ZX05023)

摘　　要：通过东海陆架盆地西湖凹陷构造的详细剖析,确定龙井运动发生于中中新世至中新世末,是一次逐渐增强又逐渐减弱的构造活动。龙井运动的主要影响是在中新世晚期使西湖凹陷中央形成了一条北强南弱的NN向反转背斜带,其影响范围随时间逐渐缩小。受舟山国头深大断裂的影响,龙井运动所形成的反转背斜带被错断,形成现今西湖凹陷内中央背斜带不规则的平面分布。西湖凹陷中中新世正断裂数量的减少,沉积范围的缩小,以及沉积物粒度的变化均为龙井运动所造成。龙井运动在时间和区域构造位置上都能与冲绳海槽初次张裂相对应,它的动力来源主要是菲律宾海板块俯冲造成冲绳海槽张裂,向西推挤钓鱼岛隆褶带而产生的。Through detailed structural analysis of Xihu Depression in East China Sea Basin,it can be determined that the Longjing Movement occurs from the Middle Miocene to the Late Miocene. And the intensity of this tectonic activity gradually changes from stronger to weaker. The main impact of Longjing Movement is forming a NNE-trending inversion uplift belt in the middle of Xihu Depression in the Late Miocene,the transformation of which is strong in the north and weak in the south. As affected by Zhoushan-Guotou deep faults belt,the inversion uplift belt Longjing Movement formed is staggered,thus the distribution of inversion uplift in Xihu Depression nowadays is anomalous. The reduction of normal faults number,the narrowing of deposition range and the change in the sedimentary grain size in Xihu Depression are caused by Longjing Movement in Miocene. Because Longjing Movement can be compared to the first opening of Okinawa Trough from time and regional tectonic location aspects,the main dynamical source of Longjing Movement is from the subduction of Philippine Plate,which caused the opening of Okinawa Trough and push Diaoyu Islands Fold-uplift beltwestward.

关 键 词：西湖凹陷 龙井运动 构造演化 深部断裂 冲绳海槽 反转构造 

分 类 号：P542[天文地球—构造地质学]