Building India: Clues from the Singhbhum Craton & Southern India

建设印度：辛格布姆克拉通的线索

• 批准号: 1347942
• 负责人: Joseph Meert
• 金额: $ 23万
• 依托单位: University of Florida
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2014
• 资助国家: 美国
• 起止时间: 2014-08-15 至 2018-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1347942&HistoricalAwards=false
• 关键词: Building; India; Clues; Singhbhum; Craton

This award is focused on understanding the geological history of the Indian subcontinent and the complexities of its formation. Like many continents, India is composed of several geographically and geologically distinct elements that were welded together to form modern-day Peninsular India. The principal investigators for this project are examining two regions in India that are poorly studied (Singhbhum craton-northeast India and the southern Indian Dharwar craton and surrounding region). The project involves a combination of paleomagnetic and geochronologic studies that provide us with information regarding where and when these continental blocks were incorporated into India along with their relationship to other landmasses during the Proterozoic Eon (2.5 billion to 540 million years ago). It is hypothesized that the Indian subcontinent or some of its sub-regions may have been part of two ancient supercontinents called Rodinia and Columbia. This research is aimed at deciphering the complexities of how these supercontinents were assembled and subsequently dispersed due to plate tectonics, as well as examining any potential links to concomitant changes in the biosphere and climate. This project will provide key information regarding the timing and location of the suture/rift zones between continental blocks within India and the larger landmasses of Columbia and Rodinia. The work involves an international team of scientists from the United States, India, and Canada. In addition to the research objectives of the project, the award is supporting the training of undergraduate and graduate graduate students in a STEM discipline. The principal investigators are working to broaden participation of underrepresented groups in STEM by recruiting students from under-represented groups in the Geosciences. The research results from this project will be disseminated through top journals, meetings, presentations at K-12 educational institutions and other public outreach efforts. Our knowledge of Proterozoic supercontinents such as Rodinia and Columbia are based on a relatively small (but growing) paleomagnetic database. East Gondwana (Australia, Antarctica, India, Madagascar and Sri Lanka) is a critical piece of the supercontinental models. Only India and Australia contain rocks that are relatively un-deformed and un-metamorphosed considered useful for paleomagnetic studies. Our goal in this proposal is to fill in critical gaps in India's drift history through the combined use of paleomagnetism and geochronology. The results are providing researchers with key tie points in reconstructing past continental assemblies. These reconstructions, in turn, will be evaluated for their effects on global climate change, evolution, mantle dynamics and mineral exploration. The key focus of this proposal is to obtain high-quality paleomagnetic data from a series of dykes in the Singhbhum craton and localities in southern India. These data will include geochronological data and field tests to fully constrain the age of magnetization in the rocks. The methodologies employed in this proposal have already proven effective in improving our knowledge of India?s relationship to other landmasses. This proposal will obtain well-dated paleomagnetic poles from the Singhbhum craton (east-central India) and the southernmost Dharwar craton (south India) in an effort to: (a) expand the Proterozoic paleomagnetic and geochronological database for India (its barcode); (b) use paleomagnetism to test cratonic coherence between the north and south Indian cratons across the Central Indian Tectonic zone during the Proterozoic; (c) establish the extent of a proposed ~1.9 Ga radiating dyke swarm already established in the Bastar and Dharwar cratons and (d) establish the position of India in the supercontinents of Rodinia and Columbia. These ideas will be tested by collecting paleomagnetic and geochronologic samples from the targeted regions within India.

该奖项的重点是理解印度次大陆的地质历史及其形成的复杂性。 像许多大洲一样，印度由几个地理和地质上不同的元素组成，它们被焊接在一起形成现代半岛印度。 该项目的主要研究人员正在研究印度研究不足的两个地区（Singhbhum Craton-Northeast印度和印度南部Dharwar Craton及其周边地区）。 该项目涉及古磁和地质研究的结合，这些研究为我们提供了有关这些大陆块的何时何地和何时将这些大陆块纳入印度的信息，以及它们与proteroyocic eon期间与其他地块的关系（25亿至5.4亿年前）。 假设印度次大陆或其某些子区域可能是两个古老的超级官员的一部分，称为Rodinia和Columbia。 这项研究旨在解释这些超强如何组装并随后由于板块构造而分散的复杂性，并检查了与生物圈和气候变化的任何潜在联系。该项目将提供有关印度大陆区与哥伦比亚和罗迪尼亚较大大陆区域之间缝合线/裂谷区域的时机和位置的关键信息。 这项工作涉及来自美国，印度和加拿大的国际科学家团队。 除了该项目的研究目标外，该奖项还支持STEM学科的本科生和研究生研究生的培训。首席研究人员正在通过招募地球科学中代表性不足的群体的学生来扩大代表性不足的STEM的参与。 该项目的研究结果将通过顶级期刊，会议，K-12教育机构的演讲以及其他公共推广工作进行传播。 我们对诸如Rodinia和Columbia之类的原始超中国的了解是基于一个相对较小的（但增长）的古磁数据库。东冈瓦纳（澳大利亚，南极洲，印度，马达加斯加和斯里兰卡）是超大型模型的关键部分。只有印度和澳大利亚包含相对未变形且未用的岩石，被认为对古磁研究有用。我们在这项提案中的目标是通过古磁和地质学的综合使用来填补印度漂移历史上的关键空白。结果为研究人员提供了重建过去大陆集会的关键领域。反过来，将评估这些重建对全球气候变化，进化，地幔动力学和矿物勘探的影响。该提案的重点是从Singhbhum Craton和印度南部地区的一系列堤坝中获取高质量的古磁数据。这些数据将包括年代学数据和现场测试，以完全限制岩石中磁化的年龄。该提案中采用的方法已经证明有效地提高了我们对印度与其他陆地的关系的了解。该提案将从Singhbhum Craton（印度东部）和最南端的Dharwar Craton（印度南部）获得良好的古磁极，以：（a）扩大印度印度（其条形码）的properreocic古代古磁性和地球人类学数据库； （b）使用古磁性测试proterokoic期间印度中部构造区的北印度和南印度克拉通之间的克拉替态相干性； （c）建立〜1.9 GA辐射的堤防群的范围已经在Bastar和Dharwar cratons中建立，并且（D）在Rodinia和Columbia的超前建立了印度的地位。这些想法将通过从印度范围内的有针对性地区收集古磁和地质样品来测试。