摘要
早古生代以前漂移在大洋中的塔里木、扬子、华北等小型克拉通板块在晚古生代开始聚敛拼贴,形成统一的大陆,奠定了中国中西部前陆冲断带发育的地质基础。新生代以来欧亚大陆与印度板块的碰撞及其远程效应,欧亚大陆强烈变形。随着青藏高原的隆升和向北、向东推挤,在远离碰撞缝合带的地方,古造山带复活,冲断带不断向外围扩展,形成统一的、规模巨大的环青藏高原盆山体系。在冲断带不断向青藏高原外围扩展的同时,在每一个单独的盆山体系(古造山活动控制的盆山耦合体系)内部发生强烈陆内变形,冲断带也依次从造山带向克拉通内部扩展,强烈的陆内造山隆升和构造挤压在造山带与克拉通之间形成了十余个前陆冲断带。从南向北分别选取了塔西南、库车、准南和准噶尔西北缘这四个前陆冲断带的构造缩短率和盆山耦合导致的高程差在平面上的变化特征,来研究环青藏高原巨型盆山体系内部的前陆冲断带在新生代的构造变形特征的空间分布规律。认为在欧亚大陆与印度板块的碰撞及其远程效应控制下,环青藏高原巨型盆山体系从内向外构造变形强度、盆山耦合程度具有依次降低的规律;克拉通边缘的单个盆山组合中从山前向克拉通方向构造变形强度依次降低,构造变形样式逐渐变得简单。
Those Plates, such as Tarim, Yangtze, Huabei etc started to converge in the late Paleozoic after drift from south to north in the ancient ocean in the early Paleozoic, then formed the unified continent which would be a basis of thrust tectonic in middle-western China. It took place strongly deformation intra-Eurasia continent result from the Indian/Eurasia collision and its remote effect. Tibetan plateau uplifted and pushed east-northwardly. Ancient orogenic belt rejuvenated and thrust toward Cratonic basin even in the distance. The uniform and large scale Circum-Tibet Plateau Basin and Range System formed with the whole thrust tectonic deformation propagated outward the Tibetan plateau. There also occurred basin-and-range coupling reaction, and thrust deformation propagated from orogenic belt to Cratonic basin in the same time. There are more than ten thrust and fold belts among the orogenic belts and Cratonic basins. The authors study the Cenozoic tectonic deformation characteristics and its spatial distribution based on the structural shortenee quantity resulted from thrust and fold, and the elevation distance resulted from basin-and-range coupling reaction in south-western Tarim basin, Kuqa area, southern Junggar basin ＆ north-western Junggar basin. The structural deformation degree and basin-and-range coupling intensity reduce gradually outward peripheral Tibetan Plateau. The structural deformation degree also reduces and structural style simplifies gradually from orogenic belt to Cratonic basin.
出处
《地质学报》
EI
CAS
CSCD
北大核心
2007年第9期1200-1207,共8页
Acta Geologica Sinica
基金
"中国中西部前陆构造特征研究"(编号2001BA616A-04-01)项目资助的成果
关键词
环青藏高原
盆山体系
前陆冲断带
构造缩短量
盆山耦合
circum-Tibet Plateau
basin and range system
foreland thrust belt
tectonic shortening
bosin-and-range coupling
作者简介
李本亮，男，1971年生。2000年获得南京大学构造地质学博士学位，现为中国石油勘探开发研究院盆地构造室高级工程师，从事构造地质研究。通讯地址：100083，北京海淀区学院路20号910信箱，实验研究中心；电话：010-62098458；Email：lbl@petrochina．com．cn。
