The influence of Cretaceous paleolatitude variation of the Tethyan Himalaya on the India-Asia collis

来源 :Science China(Earth Sciences) | 被引量 : 0次 | 上传用户:hhgzju1
下载到本地 , 更方便阅读
声明 : 本文档内容版权归属内容提供方 , 如果您对本文有版权争议 , 可与客服联系进行内容授权或下架
论文部分内容阅读
Identifying when, where, and how India and Asia collided is a prerequisite to better understand the evolution of the Himalayan-Tibetan Plateau. Whereas with essentially the same published paleomagnetic data, a large range of different India-Asia collision models have been proposed in the literature. Based upon the premise of a northwards-moving Indian plate during the Cretaceous times, we analyze the significant variations in relative paleolatitude produced by a nearly 90° counterclockwise(CCW)rotation of the plate itself during the Cretaceous. Interestingly, recent studies proposed a dual-collision process with a Greater India basin or post-Neo-Tethyan ocean for the India-Asia collision, mainly in the light of divergent Cretaceous paleolatitude differences of the Tethyan Himalaya between the observed values and expected ones computed from the apparent polar wander path of the Indian plate. However, we find that these varied paleolatitude differences are mainly resulted from a nearly 90° CCW rotation of a rigid/quasi-rigid Greater Indian plate during the Cretaceous. On the other hand, when the Indian craton and Tethyan Himalaya moved as two individual blocks rather than a united rigid/quasi-rigid Greater Indian plate before the India-Asia collision, current available Cretaceous paleomagnetic data permit only multiple paleogeographic solutions for the tectonic relationship between the Indian plate and the Tethyan Himalayan terrane. We therefore argue that the tectonic relationship between the Indian plate and the Tethyan Himalayan terrane cannot be uniquely constrained by current paleomagnetic data in the absence of sufficient geological evidence, and the so-called Greater India basin model is just one of the ideal scenarios. Identifying when, where, and how India and Asia collided is a prerequisite to better understand the evolution of the Himalayan-Tibetan Plateau. Whereas with essentially the same published paleomagnetic data, a large range of different India-Asia collision models have been proposed in the literature based on the premise of a northwards-moving Indian plate during the Cretaceous times, we analyze the significant variations in relative paleolatitude produced by a nearly 90 ° counterclockwise (CCW) rotation of the plate itself during the Cretaceous. Interestingly, recent studies proposed a dual-collision process with a Greater India basin or post-Neo-Tethyan ocean for the India-Asia collision, mainly in the light of divergent Cretaceous paleolatitude differences of the Tethyan Himalaya between the observed values ​​and expected ones computed from the apparent polar wander path of the Indian plate. However, we find that these varied paleolatitude differences are mainly resulted from a nearly 90 ° CCW rotation of a rigid / quasi-rigid Greater Indian plate during the Cretaceous. On the other hand, when the Indian craton and Tethyan Himalaya moved as two individual blocks rather than a united rigid / quasi-rigid Greater Indian plate before the India -Asia collision, current available Cretaceous paleomagnetic data permit only multiple paleogeographic solutions for the tectonic relationship between the Indian plate and the Tethyan Himalayan terrane. We therefore argue that the tectonic relationship between the Indian plate and the Tethyan Himalayan terrane can not be uniquely constrained by current paleomagnetic data in the absence of sufficient geological evidence, and the so-called Greater India basin model is just one of the ideal scenarios.
其他文献
随着我国经济的不断发展,我国企业之间的竞争更加激烈,企业生产经营的压力也在不断增加,为了提高自身的市场竞争力,企业急迫的需要提高自身的管理水平.标准化管理是提高企业
中国观赏石博览会·2007“走进奥运”北京邀请展已经落下帷幕。本编辑部记者有幸对本次“北京邀请展”进行了全程采访,广泛接触了展会组织者、承办者、参展者和众多的参观者,
近年来我国经济的发展使人们的生活质量水平得到大幅度提升,人们的消费结构相比较以前也发生了很大的改变,因为生活水平提高,对于旅游业等第三产业的需求提升,有了更多的精神
随着我国医疗快速发展,医院之间的竞争也日益激烈,财务分析对于大型公立医院的长远发展及规划具有的积极性作用,既能够让医院的战略目标进一步得到强化,同时也能促进医院自身
在当前各高校建设发展过程中,后勤管理工作是不可缺少的重要组成部分,其能够为高校实现可持续发展目标提供充足的源动力.因此,要想促使高校后期管理工作发挥出最大的价值作用
随着信息技术的不断发展,其获得了非常广泛的应用,通过将其与党建工作进行有机结合,有助于促进党建工作水平的不断提高.本文结合四川川煤石洞沟煤业有限责任公司党建智慧云平
近年来,网络技术、信息技术飞速发展,广播电视无线传输迎来了新的机遇与挑战.在此背景下,无线广播电视传输需要结合时代发展背景,跟随科技进步的脚步,保障传输良好运行的基础
无线发射技术在广播电视中的应用能够有效地提高广播电视质量,充分满足人们的精神文化需求,本文从无线发射技术的技术特征和当前仍然存在的问题入手,提出了加强无线发射技术
企业在各个时期发展下发的文书,形成了档案信息.档案的书写规范包括字迹、格式、内容,如书写的不够规范,直接对档案的质量产生影响.进而要求必须具有较强的文书工作能力,对公
长期以来,IT 技术人员非常注重的一项问题就是加强软件产品质量的措施.软件测试是检验软件问题的主要措施和方法,可以有效辨别软件隐藏的技术不足和问题.根据目的的差异,根据