气候变化领域集成服务门户(CCPortal): The exhumation of the Indo-Burman Ranges, Myanmar

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DOI	10.1016/j.epsl.2019.115948
	The exhumation of the Indo-Burman Ranges, Myanmar
	Najman Y.; Sobel E.R.; Millar I.; Stockli D.F.; Govin G.; Lisker F.; Garzanti E.; Limonta M.; Vezzoli G.; Copley A.; Zhang P.; Szymanski E.; Kahn A.
发表日期	2020
ISSN	0012821X
卷号	530
英文摘要	The Indo-Burman Ranges (IBR) are a mountain range comprised of Mesozoic-Cenozoic rocks which run the length of Western Myanmar, extending into India and Bangladesh; to the west lies the Indian Ocean, and to the east lies the Central Myanmar Basin (CMB) along which the Irrawaddy River flows. The IBR are considered to be an accretionary prism, developed at the juncture of the Indian and Sunda plates, and a number of hypotheses have been proposed for their evolution. However, in order for these hypotheses to be evaluated, the timing of IBR evolution needs to be determined. We undertook a two-pronged approach to determining the timing of uplift of the IBR. (1) We present the first low-temperature thermochronological age elevation profiles of the IBR using ZFT, AFT and ZHe techniques. Our data show: a major period of exhumation occurred around the time of the Oligo-Miocene boundary; we tentatively suggest, subject to further verification, an additional period of exhumation at or before the late Eocene. (2) We carried out a detailed multi-technique provenance study of the sedimentary rocks of the IBR and Arakan Coastal region to their west, and compared data to coeval rocks of the CMB. We determined that during Eocene times, rocks of the CMB and IBR were derived from similar local provenance, that of the Myanmar arc to the east. Therefore at this time there was an open connection from arc to ocean. By contrast, by Miocene times, provenance diverged. Rocks of the CMB were deposited by a through-flowing Irrawaddy River, with detritus derived from its upland source region of the Mogok Metamorphic Belt and Cretaceous-Paleogene granites to the north. Such a provenance is not recorded in coeval rocks of the IBR, indicating that the IBR had uplifted by this time, providing a barrier to transport of material to the west. To the previously published list of viable proposals to explain the exhumation of the range, we add a new suggestion: the period of exhumation around the time of the Oligo-Miocene boundary could have been governed by a change to wedge dynamics instigated by a major increase in the thickness of the incoming Bengal Fan sediment pile. © 2019 Elsevier B.V.
关键词	age-elevation profile detrital thermochronology and geochronology Indo-Burman Ranges Myanmar palaeo-Irrawaddy provenance
英文关键词	Geochronology; Metamorphic rocks; Piles; Temperature; age-elevation profile; Detrital thermochronology; Indo-Burman Ranges; Myanmars; palaeo-Irrawaddy; provenance; Sedimentary rocks; accretionary prism; elevation; exhumation; provenance; tectonic evolution; thermochronology; uplift; Ayeyarwady; Indo-Burma; Myanmar
语种	英语
来源期刊	Earth and Planetary Science Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/202802
作者单位	LEC, Lancaster University, Lancaster, LA1 4YQ, United Kingdom; Institut für Geowissenschaften, Universität Potsdam, Karl-Liebknecht-Strasse 24-25, Potsdam-Golm, 14476, Germany; BGS Keyworth, Nottingham, NG12 5GG, United Kingdom; The University of Texas at Austin, Department of Geological Sciences, Jackson School of Geosciences, 1 University Station C1100, Austin, TX 78712, United States; Fachbereich Geowissenschaften der Universitat Bremen, Postfach 330, Bremen, 28334, Germany; Laboratory for Provenance Studies, Department of Earth and Environmental Sciences, University of Milano-Bicocca, Milano, 20126, Italy; Department of Earth Sciences, Bullard Labs, Cambridge University, Cambridge, CB2 3EQ, United Kingdom; Key Laboratory of Tectonics and Petroleum Resources (China University of Geosciences), Ministry of Education, Wuhan, 430074, China; Earth Science Department, Chevron Energy Technology Company, Houston, TX 77002, United States
推荐引用方式 GB/T 7714	Najman Y.,Sobel E.R.,Millar I.,et al. The exhumation of the Indo-Burman Ranges, Myanmar[J],2020,530.
APA	Najman Y..,Sobel E.R..,Millar I..,Stockli D.F..,Govin G..,...&Kahn A..(2020).The exhumation of the Indo-Burman Ranges, Myanmar.Earth and Planetary Science Letters,530.
MLA	Najman Y.,et al."The exhumation of the Indo-Burman Ranges, Myanmar".Earth and Planetary Science Letters 530(2020).