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Linking a prolonged Neo‐Tethyan magmatic arc in S outh A sia: Zircon U‐Pb and Hf isotopic constraints from the Lohit Batholith, NE I ndia
Author(s) -
Lin TeHsien,
Chung SunLin,
Kumar Anil,
Wu FuYuan,
Chiu HanYi,
Lin IJhen
Publication year - 2013
Publication title -
terra nova
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.353
H-Index - 89
eISSN - 1365-3121
pISSN - 0954-4879
DOI - 10.1111/ter.12056
Subject(s) - batholith , zircon , terrane , geology , magmatism , geochemistry , back arc basin , subduction , petrology , paleontology , tectonics
The Neo‐Tethyan subduction that operated before the I ndia‐ A sia collision resulted in an Andean‐type convergent margin in S outh A sia and was associated with extensive arc magmatism that formed the Transhimalayan batholiths. Magmatism in the Gangdese Batholith, the largest batholith exposed in the Lhasa terrane of southern T ibet, is considered to have lasted from the early Jurassic to Eocene. However, eastward correlation of the Gangdese Batholith is uncertain because it is truncated by the eastern H imalayan syntaxis. Here, we report new data from the Lohit Batholith, NE I ndia, including: (i) zircon U‐Pb ages of five granitoids from ca. 148 to 96 Ma; and (ii) zircon Hf isotopes of these rocks that yield high and positive ε Hf (T) values. We argue that the Lohit Batholith is the eastward extension of the Gangdese Batholith, and can be correlated southward to the Wuntho‐Popa arc in West Burma, thus linking a prolonged Neo‐Tethyan magmatic arc system from southern T ibet to S outheast A sia.