青藏高原北部NNW向构造活动方式及形成年代
|
摘要
对青藏高原北部ＮＮＷ向构造的地质地貌组合特征、活动方式及形成年代等问题进行的研究表明，ＮＮＷ向构造在地貌上由西向东表现为隆、拗相间排列的构造格局。其中ＮＮＷ向活动断裂依次发育在隆起带的东缘，形成伴有褶皱构造的逆冲－挤压构造带。拗陷带则由一系列位于隆起带之间的压陷性盆地带组成。ＮＮＷ向构造活动强烈，特别是在第四纪中、晚期以来，它们不仅制约着青藏高原北部区地质地貌的发生和发展，而且还在地震活动及强震孕育和发生过程中扮演着重要的角色，ＮＮＷ向隆起从第三纪末期至第四纪初期开始发育，但大规模隆起发生在第四纪中更新世以来。
Based on the recent field work,we analyze the geological geomorphic characteristics,activity ways and formation ages of the NNW tectonics developed in the northern Tibet plateau The results indicate that this NNW tectonics exists in all the area from north to the east of Kunlun moutain to the Hexi corridor In geomorphology it represents the structural configuration of uplift downsink jaxuposition from east to west The NNW faults developed in the east margin of the uplift zone as fold companion thrust compression zone The downsink zones are composed of a series of depressive basins located between middle and late Quaternary,highly active which not only control the formation and development of the geomorphic feathers but also play vital roles to seismic activity and orogeny and occurrence of strong events The NNW tectonics began to develop from the late Tertiary to early Quaternary and uplift of large scales happened from middle Pleistocene
Based on the recent field work,we analyze the geological geomorphic characteristics,activity ways and formation ages of the NNW tectonics developed in the northern Tibet plateau The results indicate that this NNW tectonics exists in all the area from north to the east of Kunlun moutain to the Hexi corridor In geomorphology it represents the structural configuration of uplift downsink jaxuposition from east to west The NNW faults developed in the east margin of the uplift zone as fold companion thrust compression zone The downsink zones are composed of a series of depressive basins located between middle and late Quaternary,highly active which not only control the formation and development of the geomorphic feathers but also play vital roles to seismic activity and orogeny and occurrence of strong events The NNW tectonics began to develop from the late Tertiary to early Quaternary and uplift of large scales happened from middle Pleistocene
引文
才树华．1989．河西构造系及其与青藏高原东北部地震活动的关系．西北地震学报，11（1）：53～61．蔡厚雄．1986．谈谈河西走廊新构造运动．甘肃地质（6）：95～101．陈杰．1995．祁连山西段第四纪构造动阶段、性质及其年代研究：［学位论文］．北京：国家地震局地质研究所．国家地震局地质研究所，宁夏地震局．1988．海原活动断裂．北京：地震出版社．国家地震局地质研究所．1993．祁连山－河西走廊活动断裂系．北京：地震出版社．国家地震局兰州地震研究所．1992．昌马活动断裂带．北京：地震出版社．黄宝仁．1984．青海共和盆地上新统及下更新统介形类化石．中国科学院南京地质与古生物研究所集刊（19）．北京：科学出版社．45～49．侯康明．1996．1927年古浪8级大震的发震构造条件及区域动力学环境研究：［学位论文］．北京：国家地震局地质研究所．兰州地震大队地震地质队．1979．陕甘宁青活动构造体系及其控震作用的初步分析．地质力学论丛（第5号）．北京：科学出版社．李四光．1955．旋卷构造及其它有关西北大地构造体系复合问题．北京：科学出版社．李四光．1973．地质力学概论．北京：科学出版社．李四光．1974．天文地质古生物资料摘要．北京：科学出版社．李玉龙，侯珍清，康哲民．1986．中国西北陕甘宁青地震区划．兰州：甘肃人民出版社．刘东生．1964．中国的黄土堆积．北京：科学出版社．潘桂棠，王培生，徐耀文，等．1991．青藏高原新生代构造演化．北京：地质出版社．潘保田．1991．黄河发育与青藏高原隆起问题：［学位论文］．兰州：兰州大学．徐叔鹰，潘保田．1984．共和盆地地貌发育与环境演化探讨．兰州大学学报（自然科学版），20（1）：146～157．徐叔鹰，潘保田．1987．青海共和组地层的沉积时代与沉积环境．兰州大学学报（自然科学版），23（2）：109～119．周本雄．1959．青海共河盆地更新世的哺乳动物化石．古脊椎动物与人类，1（4）：8～12．中国科学院兰州地质研究所．1979．青海湖综合考察报告．北京：科学出版社．audemerY，TapponnierP，MeyerB，etal．1995．Partitionofcrustalslipbetwenlinked，activefaultintheeasternQilianshanandevidenceforamajorseismicgap，The“Tianzhugap”，onthewesternHaiyuanfault，Gansu（China），GeophysJInt，120：599～645．TapponnierP，Meyer，B，AvouacJ，etal．1990．ActivethrustingandfoldingintheQilianshan，anddecouplingbetwentheuppercrustandmentleinnortheasterntibet，Earthplanet．SciLet，97：382～403
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心