Collaborative research: Testing Himalayan tectonic and erosional history via chronostratigraphic correlation between the Lesser Himalaya and Indian craton

合作研究：通过小喜马拉雅山和印度克拉通之间的年代地层相关性测试喜马拉雅构造和侵蚀历史

• 批准号: 1124518
• 负责人: Paul Myrow
• 金额: $ 6万
• 依托单位: Colorado College
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2011
• 资助国家: 美国
• 起止时间: 2011-10-01 至 2015-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1124518&HistoricalAwards=false
• 关键词: Collaborative; research; Testing; Himalayan; tectonic

Collaborative Research: Testing Himalayan tectonic and erosional history via chronostratigraphic correlation between the Lesser Himalaya and Indian cratonNigel Hughes, University of California, Riverside EAR-1124303Shuhai Xiao, Virginia Tech EAR-1124026Paul Myrow, Colorado College EAR-1124518Ganging Jiang, Univ. Nevada, Las Vegas EAR-1124545ABSTRACT This project will test the hypotheses that (1) the Paleoproterozoic, Mesoproterozoic, Neoproterozoic, and Cambrian of all parts of the Himalaya are part of a continuous passive margin succession and not part of an accreted terrane; (2) that neodymium isotopic values (åNd) of Himalayan rocks are primarily controlled by depositional age, rather than by geographical source; and (3) that the erosion of Neoproterozoic and Cambrian material from the northern or 'inner' part of the Lesser Himalaya (LH) requires that uplift in that region took place several million years before currently accepted. Confirmation of these hypotheses, which preliminary data suggests is likely, will be achieved by detailed stratigraphic correlation between strata of the Himalayan region and the Indian craton. If confirmed, our results will require that progressive unroofing of a continuous margin succession took place, initially with erosion of a thick succession of ?outer? LH-age strata with a geochemical signature identical to that of the Greater and Tethyan Himalaya. As a consequence, the initiation of uplift of the LH took place significantly earlier in the Miocene than currently invoked, thus significantly revising the Cenozoic uplift history of the Himalayan region. Hence in addition to clarifying the pre-deformational history of the northern Indian margin, this proposal will impact understanding of Himalayan tectonics, uplift, and erosion. Furthermore, the fossils present in these deposits are poorly known and detailed analysis may also provide novel insights into early eukaryotic evolution.As the world's greatest mountain chain the Himalaya has significant impact on a wide range of environmental issues, ranging from the chemistry of ocean waters to the nature of global climate. Accurate understanding of this influence requires knowledge how global systems changed during the growth of these mighty mountains. This, in turn, requires knowledge of conditions prior to the event that initiated Himalayan uplift - the collision of the Indian subcontinent with Asia. This project brings together scientists with a wide range of experience who will jointly investigate the geological relationship between rocks that make up the much of the Himalayan bedrock and those that occur within the heart of India itself. This comparison will test the currently popular idea that much of the Himalaya is 'exotic', meaning that it was not originally attached to the core landmass of India. This idea is important because, if correct, it means that PIs can ?fingerprint? the uplift and erosional history of the Himalaya based on when 'exotic' and, when truly Indian materials, first appeared in the record of Himalayan uplift and erosion recorded in the rocks of the Bay of Bengal and other areas. PIs initial studies suggest that the ?exotic? idea is incorrect, and rests on a misunderstanding of the ages of formation of the original Himalaya rocks. If PIs are right, it will suggest that the southern Himalaya began uplift 5 million years before currently accepted, and will reconcile an important global geochemical shift with the timing of Himalayan uplift. In addition to training undergraduate and graduate students, this award also will facilitate publication of children?s book on global environmental change in a major Indian regional language, and its dissemination to village schools in rural Bengal.

合作研究：通过较小的喜马拉雅山与印度克拉通尼格尔·休斯（Indian Cratonnigel Hughes），加利福尼亚大学河滨大学EAR-1124303SHUHAI Xiao，Virginia firginia Tech Tech EAR-1124026Paul Myrow Coloriv，Coloriv Eariv n g Coloriv n g Colorygng，测试喜马拉雅构造和侵蚀历史的测试。内华达州，拉斯维加斯EAR-1124545删除该项目将测试（1）（1）旧神经元，中元，新神经古生代和喜马拉雅山脉所有部分的旧古代仓，中元和寒武纪，是连续的驱动力余量成功的一部分，并且不是接受的terrane的一部分； （2）喜马拉雅岩石的同位素异位值（Ånd）主要由沉积年龄控制，而不是由地理来源控制； （3）从北部或较小喜马拉雅山（LH）的北部或“内部”部分侵蚀了新元古代和寒武纪材料，要求该地区的隆升在目前接受了数百万年之前。初步数据表明的这些假设的确认可能是通过喜马拉雅地区和印度克拉通之间的详细地层相关性来实现的。如果得到确认，我们的结果将要求进行连续边缘成功的渐进性不盖，最初是侵蚀了外部的巨大成功？ LH-AGE地层具有与大型和Tethyan喜马拉雅山相同的地球化学标志。结果，在中新世比目前所调用的LH升高的开始时间要早得多，因此显着修改了喜马拉雅地区的Cenozoic隆升历史。因此，除了澄清北印度北部边缘的预言历史外，该提议还将影响对喜马拉雅构造，隆起和侵蚀的理解。此外，这些沉积物中存在的化石是众所周知的，详细的分析也可能提供对早期真核进化的新见解。作为世界上最伟大的山脉，喜马拉雅山对从化学的环境问题到广泛的环境问题产生了重大影响，从海洋水域到全球气候的性质。对这种影响的准确理解需要知识在这些强大的山脉增长过程中如何改变全球系统。反过来，这需要在启动喜马拉雅uplift的事件之前了解条件 - 印度次大陆与亚洲的碰撞。该项目将科学家汇集在一起​​，具有广泛的经验，他们将共同研究构成喜马拉雅基岩的大部分岩石之间的地质关系，以及发生在印度中心本身内的岩石之间的地质关系。这种比较将测试当前最受欢迎的想法，即喜马拉雅人的大部分是“异国情调”，这意味着它最初并不是印度的核心地块。这个想法很重要，因为，如果正确，这意味着PIS可以？指纹？喜马拉雅山的隆起和侵蚀历史基于何时“异国情调”，当真正的印度材料时，首先出现在喜马拉雅隆起和侵蚀的记录中，记录在孟加拉湾和其他地区的岩石中。 PIS的初步研究表明，外国人？想法是不正确的，并且基于对原始喜马拉雅岩石形成时代的误解。如果PI是正确的，这将表明，喜马拉雅南部开始上升500万年，并将与喜马拉雅山的时机调和重要的全球地球化学转变。除了培训本科生和研究生培训外，该奖项还将有助于出版有关印度主要地区语言全球环境变化的儿童书籍，并将其传播给孟加拉农村地区的乡村学校。