气候变化领域集成服务门户(CCPortal): Paleogene evolution of the Burmese forearc basin and implications for the history of India-Asia convergence

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DOI	10.1130/B35002.1
	Paleogene evolution of the Burmese forearc basin and implications for the history of India-Asia convergence
	Licht A.; Dupont-Nivet G.; Win Z.; Swe H.H.; Kaythi M.; Roperch P.; Ugrai T.; Littell V.; Park D.; Westerweel J.; Jones D.; Poblete F.; Aung D.W.; Huang H.; Hoorn C.; Sein K.
发表日期	2019
ISSN	167606
起始页码	730
结束页码	748
卷号	131 期号:2021-05-06
英文摘要	The geological history of the Burmese subduction margin, where India obliquely subducts below Indochina, remains poorly documented although it is key to deciphering geodynamic models for the evolution of the broader Tibetan-Himalayan orogen. Various scenarios for the evolution of the orogen have been proposed, including a collision of India with Myanmar in the Paleogene, a significant extrusion of Myanmar and Indochina from the India-Asia collision zone, or very little change in paleogeography and subduction regime since the India-Asia collision. This article examines the history of the Burmese forearc basin, with a particular focus on Eocene-Oligocene times to reconstruct the evolution of the Burmese margin during the early stages of the India-Asia collision. We report on sedimentological, geochemical, petrographical, and geochronological data from the Chindwin Basin-the northern part of the Burmese forearc-and integrate these results with previous data from other basins in central Myanmar. Our results show that the Burmese margin acted as a regular Andean-type subduction margin until the late middle Eocene, with a forearc basin that was open to the trench and fed by the denudation of the Andean volcanic arc to the east. We show that the modern tectonic configuration of central Myanmar formed 39-37 million years ago, when the Burmese margin shifted from an Andeantype margin to a hyper-oblique margin. The forearc basin was quickly partitioned into individual pull-apart basins, bounded to the west by a quickly emerged accretionary prism, and to the east by synchronously exhumed basement rocks, including coeval high-grade metamorphics. We interpret this shift as resulting from the onset of strike-slip deformation on the subduction margin leading to the formation of a paleo-sliver plate, with a paleo fault system in the accretionary prism, pull-apart basins in the forearc, and another paleo fault system in the backarc. This evolution implies that hyper-oblique convergence below the Burmese margin is at least twice older than previously thought. Our results reject any India-Asia convergence scenario involving an early Paleogene collision of India with Myanmar. In contrast, our results validate conservative geodynamic models arguing for a close-to-modern precollisional paleogeometry for the Indochina Peninsula, and indicate that any post-collisional rotation of Indochina, if it occurred at all, must have been achieved by the late middle Eocene. © 2018 Geological Society of America.
语种	英语
来源期刊	Bulletin of the Geological Society of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/184921
作者单位	Department of Earth and Space Sciences, University of Washington, Seattle, WA 98195, United States; Géosciences Rennes, UMR CNRS 6118, Université de Rennes, Rennes Cedex, 35042, France; Potsdam University, Institute of Earth and Environmental Science, Potsdam, 14476, Germany; Key Laboratory of Orogenic Belts and Crustal Evolution, Ministry of Education, Beijing, China; Geology Department, Shwe Bo University, Sagaing Region, Myanmar; Geology Department, University of Yangon, Pyay Road, Yangon, Myanmar; Instituto de Ciencias de la Ingeniería, Universidad de O'Higgins, Rancagua, Chile; Institute for Biodiversity and Ecosystem Dynamics, University of Amsterdam, Amsterdam, 1098 XH, Netherlands; Myanmar Geosciences Society, Yangon, Myanmar
推荐引用方式 GB/T 7714	Licht A.,Dupont-Nivet G.,Win Z.,et al. Paleogene evolution of the Burmese forearc basin and implications for the history of India-Asia convergence[J],2019,131(2021-05-06).
APA	Licht A..,Dupont-Nivet G..,Win Z..,Swe H.H..,Kaythi M..,...&Sein K..(2019).Paleogene evolution of the Burmese forearc basin and implications for the history of India-Asia convergence.Bulletin of the Geological Society of America,131(2021-05-06).
MLA	Licht A.,et al."Paleogene evolution of the Burmese forearc basin and implications for the history of India-Asia convergence".Bulletin of the Geological Society of America 131.2021-05-06(2019).