• 责任者：Huang Baochun (State Key Laboratory of Lithospheric Evolution ; Institute of Geology and Geophysics ; Chinese Academy of Sciences ; Beijing 100029 ; China) ; Chen Junshan
• 刊名：Chinese Journal of Geophysics
• 出版年：2010
• 卷期：53(9)
• 关键词：板块碰撞 ; plate collision ; 印度板块 ; India Plate ; 亚洲 ; Asia
• 页码：p.2045-2058
• 图表：5 illus., 121 refs.
• 分类号：0300
• issnNo：ISSN0001-5733
• isbnNo：CN11-2074/P

The India-Asia collision was responsible for creating the Himalaya-Tibetan orogen which is a focus of today’s solid Earth sciences and is considered to be the best natural laboratory for establishing new theory of continental dynamics. Timing of the India-Asia collision is not only the key boundary condition in all models for the evolution of the Himalaya-Tibetan orogenic system, but also the starting point of all discussions in the formation and evolution of the orogenic system, as well as the dynamics of plateau uplift. This paper aims to explore constraints to the initial timing and paleopositions of the India-Asia collision by analyzing presently available paleomagnetic data from the Lhasa Block and Himalayas. The newly obtained paleomagnetic results from the Linzizong Group (about 64~44 Ma) imply that the southern leading edge of the Asian continent was situated at paleolatitudes of ~10°N in the Northern Hemisphere during the period of about 64~44 Ma and the initial contact between India and Asia was most likely occurred at 65~50 Ma. Given that Greater India comprised the present Indian continent and a ~950 km northern extension, which was determined from its pre break-up position within East Gondwana and the bathymetry of the west Indian Ocean of Australia, the authors argue that the initial India-Asia collision most probably occurred between ~55 and 60 Ma.