DOI: 10.1007/s00531-012-0826-8
Scopus记录号: 2-s2.0-84884418249
论文题名: Dextral transpression and late Eocene magmatism in the trans-Himalayan Ladakh Batholith (North India): Implications for tectono-magmatic evolution of the Indo-Eurasian collisional arc
作者: Sen K. ; Collins A.S.
刊名: International Journal of Earth Sciences
ISSN: 14373254
出版年: 2013
卷: 102, 期: 7 起始页码: 1895
结束页码: 1909
语种: 英语
英文关键词: AMS
; Granite
; Indus-Tsangpo Suture Zone
; LA-ICPMS
; Ladakh batholith
; Zircon
Scopus关键词: batholith
; collision zone
; convergent margin
; crystallization
; Eocene
; Eurasian plate
; geochronology
; granite
; I-type rock
; inductively coupled plasma method
; magmatism
; magnetic susceptibility
; oceanic lithosphere
; paleomagnetism
; rhyolite
; uranium-lead dating
; zircon
; India
; Indus-Yarlung Suture Zone
; Jammu and Kashmir
; Ladakh
英文摘要: The trans-Himalayan Ladakh batholith is a result of arc magmatism caused by the northward subduction of the Tethyan oceanic lithosphere below the edge of the Eurasian plate. The batholith dominantly consists of calc-alkaline I-type granitoids which are ferromagnetic in nature with the presence of magnetite as the principal carrier of magnetic susceptibility. The mesoscopic and magnetic fabric are concordant and generally vary from WNW-ESE to ENE-WSW for different intrusions of ferromagnetic granites in different parts of the batholith. Strike of magnetic fabric is roughly parallel with the regional trend of the Ladakh batholith in the present study area and is orthogonal to the direction of India-Eurasia collision. In Khardungla and Changla section, the magnetic fabric is distributed in a sigmoidal manner. It is inferred that this sigmoidal pattern is caused by shearing due to transpression induced by oblique convergence between the two plates. U-Pb zircon geochronology of a rhyolite from the southern parts of the batholith gives a crystallization age of 71.7 ± 0.6 Ma, coeval with ~68 Ma magmatism in the northern parts of the batholith. The central part of the batholith is characterized by S-type two-mica granites, which gives much younger age of magmatism at 35.5 ± 0.5 Ma. The magnetic fabric of these two-mica granites is at a high angle to the regional trend of the batholith. It is proposed that these two-mica granites were emplaced well after the cessation of subduction and arc magmatism, along fractures that developed perpendicular to the regional strike of the batholith due to shearing. © 2012 Springer-Verlag Berlin Heidelberg. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84884418249&doi=10.1007%2fs00531-012-0826-8&partnerID=40&md5=8ef241296cf027329b433ca5b2069579
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/70509
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: Wadia Institute of Himalayan Geology, 33 GMS Road, Dehradun, 248001, India; Tectonics, Resources and Exploration (TRaX), School of Earth and Environmental Sciences, University of Adelaide, Adelaide, SA, 5005, Australia
Recommended Citation:
Sen K.,Collins A.S.. Dextral transpression and late Eocene magmatism in the trans-Himalayan Ladakh Batholith (North India): Implications for tectono-magmatic evolution of the Indo-Eurasian collisional arc[J]. International Journal of Earth Sciences,2013-01-01,102(7)