太平洋板块形成以来的中国东部构造动力学背景  

Tectonic Dynamics of Eastern China Since the Formation of the Pacific Plate

作　　者：包汉勇[1,2] 郭战峰[1] 张罗磊[3] 黄亚平[4] 

机构地区：[1]中石化江汉油田勘探开发研究院,湖北武汉430223 [2]同济大学海洋地质国家重点实验室,上海200092 [3]东京大学地震研究所 [4]中国矿业大学资源与地球科学学院,江苏徐州221116

出　　处：《地球科学进展》2013年第3期337-346,340-346,共10页Advances in Earth Science

基　　金：国家自然科学基金项目"西太平洋暖池与东亚古环境:沉积记录的海陆对比"(编号:40621063);国家油气重大专项项目"南方海相层系油气成藏与富集规律研究"(编号:2011ZX05005-003)资助

摘　　要：构造动力学研究是分析区域构造、沉积演化、岩浆活动及矿产分布的重要前提,前人研究证实自太平洋板块形成以来中国东部构造动力学背景发生了多次转变,但对于具体的转换机制还缺乏深入研究。为此,首先基于对近年来发表的同位素年龄和古地磁数据的系统收集和整理,对太平洋板块形成以来围限中国东部的太平洋板块、印度板块和菲律宾海板块等的形成年代、漂移轨迹和速率变化规律进行了详细梳理。然后依据这3大板块及其周缘板块的运动学规律,结合区域上的构造变形特征,将太平洋板块形成以来的中国东部构造动力学背景划分为:中侏罗世—早白垩世((175～170)～(145±5),(145±5)～125和125～95 Ma BP)、晚白垩世—古近纪(95～80,80～43和43～23 Ma BP)和新近纪—第四纪(23～10 Ma BP和10 Ma BP至今)等多个阶段。指出中国东部中侏罗世—早白垩世为压扭性背景,晚白垩世—古近纪则转为伸展拉张背景,到了新近纪—第四纪又转变为挤压背景,并对这3大阶段不同时期构造动力学背景作了进一步的论述。canie-magmatic ics had changed Tectonic dynamics is very important to the analysis of regional tectono-sedimentary evolution, volaction and metallogenic regularity. Although a lot of research have proved that the tectonic dynam- many times since the development of the Pacific plate, the varied mechanics needs to be explored deeply. In this paper, based on the collecting and sorting of the isotopic age and paleomagnetic data published recently, the drift trajectories and velocities of the Pacific plate, India plate and Philippines Sea plate since its distri-butions near the eastern China, are analyzed firstly. And then, according to the kinematics characteristics of these three main plates, as well as the regional tectonic deformation features, since the formation of the Pacific plate, the tectonics dynamics background of eastern China can be divided into three stages ： The Middle Jurassic-Early Cretaceous （ （ 175 ～ 170） ～ （145～5） Ma, （145～5） - 125 Ma and （ 125 - 95） Ma BP）, the late Cretaceous -Paleo- gene （95 ～ 80 Ma, 80 ～43 Ma and 43 ～ 23 Ma BP） and the Neogene-Quaternary 23 ～ 10 Ma BP and 10 Ma BP to present）. It is pointed out in the paper that the tectonic dynamics mechanics of eastern China in the Middle Juras- sic-Early Cretaceous are compress-shearing, changed to stretching and extension in the late Cretaceous-Paleoge and then turned to compression in the Neogene-Quaternary is point out, and the specific changes in these three tonic dynamic stages are discussed in detail at last last.

关 键 词：中国东部 太平洋板块 印度板块 菲律宾海板块 构造动力学 

分 类 号：P541[天文地球—构造地质学]