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青藏高原隆升阶段性
  • ISSN号:1000-7857
  • 期刊名称:《科技导报》
  • 时间:0
  • 分类:P542.1[天文地球—构造地质学;天文地球—地质学]
  • 作者机构:中国科学院青藏高原研究所, 中国科学院青藏高原地球科学卓越创新中心,北京100101
  • 相关基金:基金项目:国家重大科学研究计划全球变化研究项目(2013CB956400);国家自然科学基金项目(41620104002)
作者: 方小敏
中文摘要:

摘要青藏高原的隆升不仅是印度板块与亚洲板块碰撞导致的地球内部岩石圈地球动力学作用过程的结果,并且对全球和亚洲气候变化、亚洲地貌和地表环境过程及大量地内和地表矿产资源的形成分布产生了深刻影响。因而研究高原隆升的历史不仅对解决上述重大科学问题提供重要途径,而且可为高原区域资源环境的开发和可持续发展提供理论依据。简要回顾和梳理了国内外近年来,围绕青藏高原隆升所取得的主要进展。研究表明新生代青藏高原经历了多阶段、多幕次、准同步异幅且高原南北后期加速隆升的演化过程。具体可划分为55~30、25~10及8~0Ma3个主要生长隆升期次。其中55~30Ma的高原早期隆升。主要集中在高原中南部的拉萨地块和羌塘地块,并且可能隆升到接近3km高度。或甚至更高。有人称之为“原西藏高原”,但其周缘存在准同步异幅的变形隆升响应;25~10Ma的中期隆升。“原西藏高原”南北缘的喜马拉雅山和可可西里一昆仑山开始强烈隆升,“原西藏高原”率先隆升到目前高度并开始向东西两侧挤出物质、拉张形成南北向裂谷,高原北缘普遍产生广泛变形隆升但幅度有限;从约8Ma开始的晚期隆升,高原南、北部边缘的喜马拉雅山和昆仑山一西秦岭以北的高原东北部隆升显著加速。经历一系列短暂快速的多幕次构造变形和生长隆升,最终形成现今高原面貌。

英文摘要:

The uplift of the Tibetan Plateau is the result of the collision of the India-Asia Plates with the result of the geodynamic process of the earth's lithosphere, and has profound impacts on the global and Asian climate changes, the Asian geomorphology and surface environment, and the abundant surface and underground mineral resources. Thus, the study of the uplift history of the Tibetan Plateau can not only solve the major scientific problems mentioned above, but also provide a theoretical basis for the plateau regional environmental resource exploitation and sustainable development. In this paper, we briefly review the main progresses of recent studies concerning the uplift of the Tibetan Plateau. It is shown that the Tibetan Plateau has experienced uplift processes of multiple stages and episodes, quasi- synchronous but with different amplitudes, which are accelerated in a later period. The uplift processes can be divided into three main uplift stages, those during 55~30 Ma, 25-30 Ma, and 8~0 Ma, respectively. The early uplift mainly happens in the Qiangtang and Lhasa terrains of the central-southern Tibetan Plateau during 55-30 Ma, which might be close to the modern plateau elevation and is called the "Proto-Tibetan Plateau"; they are deformation uplifts in the peripheral area, quasi- synchronous but with different amplitudes. The second stage uplift mainly occurs in the Himalaya and Hoh Xil-Kunlun Mountains in the north and south of the "Proto-Tibetan Plateau" during 25~10 Ma. The "Proto-Tibetan Plateau" may have first reached its present elevation and started to squeeze its materials out to both E-W sides, resulting in the N-S extensional rifts, accompanied by a widespread deformation and uplift of the northern part of the plateau, but with limited magnitudes. Since ~8 Ma, the Himalayas and NE Tibetan Plateau in the southern and northern margins of the major plateau begins to experience an accelerated uplift, manifesting as a set of episodic short intense tectonic deformation events, and finally

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期刊信息
  • 《科技导报》
  • 北大核心期刊(2011版)
  • 主管单位:中国科学技术协会
  • 主办单位:中国科学技术协会
  • 主编:项昌乐
  • 地址:北京市海淀区学院南路86号科技导报社
  • 邮编:100081
  • 邮箱:kjdbbjb@cast.org.cn
  • 电话:010-62138113
  • 国际标准刊号:ISSN:1000-7857
  • 国内统一刊号:ISSN:11-1421/N
  • 邮发代号:2-872
  • 获奖情况:
  • 国内外数据库收录:
  • 俄罗斯文摘杂志,美国化学文摘(网络版),英国农业与生物科学研究中心文摘,波兰哥白尼索引,美国乌利希期刊指南,美国剑桥科学文摘,英国科学文摘数据库,中国中国科技核心期刊,中国北大核心期刊(2008版),中国北大核心期刊(2011版),中国北大核心期刊(2014版)
  • 被引量:24858