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Eocene magmatism from the Liemai intrusion in the Eastern Tethyan Himalayan Belt and tectonic implications

Published online by Cambridge University Press:  27 November 2017

LIMING TIAN ,
LIYUAN WANG ,
HAITAO ZHENG  and
BO YANG
LIMING TIAN
Affiliation:
Geophysical and Geochemical Exploration Brigade of Jiangxi, Nanchang, 330002, China
LIYUAN WANG*
Affiliation:
College of Zijin Mining, Fuzhou University, Fuzhou, 350116, China
HAITAO ZHENG
Affiliation:
Institute of Geological Survey, China University of Geosciences, Wuhan, 430074, China
BO YANG
Affiliation:
College of Energy, Chengdu University of Technology, Chengdu, China
*
†Author for correspondence: Email: [email protected]
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Abstract

Multistage magmatic thermal events occurred in the Yardoi Dome and contain important information on the tectonomagmatic processes. The dome has played a crucial role in understanding the collisional evolution of the Tethyan Himalayan. We present new geochronological and geochemical data for muscovite-granite exposed in the Liemai area, Eastern Tethyan Himalayan Belt. Liemai muscovite-granite is strongly peraluminous, with A/CNK values characterized by evolved geochemical composition with high contents of SiO2-enriched large-ion lithophile elements, and is depleted of high-field-strength elements. These geochemical features indicate that granites possibly derived from partial melting of metasedimentary rocks and plagioclase fractional crystallization probably played a critical role in production of peraluminous granitic melts. Zircon U–Pb dating from muscovite-granite yielded ages of approximately 48.5 ± 1.1 Ma, representing its crystallization ages. This age is the oldest age of Tethyan Himalayan leucogranite from the Yardoi Dome and adjacent areas. However, the inherited zircon cores have ages of 135.7–3339.2 Ma. The εHf(t) values of all zircons vary from –6.4 to –2.3 and have varying Hf-isotope crustal model ages of 731–839 Ma. The geochemical and isotopic compositions indicate that magma of the Liemai granite can most likely be interpreted as products of the break-off related to thermal perturbation along the break-off window associated with the subduction of Neo-Tethyan slab. These magmas were derived mainly from the anatexis of ancient crustal materials under contraction and thickening conditions due to subduction of the Indian continent beneath southeastern Tibet.

Keywords

Tethyan HimalayaLiemai muscovite-graniteZircon U–Pb datingcrustal anatexis
Type
Original Articles
Information
Geological Magazine , Volume 156 , Issue 3 , March 2019 , pp. 510 - 524
Copyright
Copyright © Cambridge University Press 2017 

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