Linking a prolonged Neo‐Tethyan magmatic arc in South Asia: Zircon U‐Pb and Hf isotopic constraints from the Lohit Batholith, NE India
Linking a prolonged Neo‐Tethyan magmatic arc in South Asia: Zircon U‐Pb and Hf isotopic constraints from the Lohit Batholith, NE India
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DOI：
10.1111/ter.12056
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发表时间：
2013-12
期刊：
影响因子：
2.4
通讯作者：
Te-Hsien Lin;Sun‐Lin Chung;Anil Kumar;Fu-Yuan Wu;H. Chiu;I. Lin
中科院分区：
文献类型：
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作者：
Te-Hsien Lin;Sun‐Lin Chung;Anil Kumar;Fu-Yuan Wu;H. Chiu;I. Lin
在印度-亚洲碰撞之前的新特提斯俯冲作用导致了南亚的安第斯型辐合边缘，并与形成跨喜马拉雅岩基的广泛弧岩浆活动有关。然而，冈底斯基的东向对比是不确定的，因为它被喜马拉雅东部辐合所截断。本文报道了印度东北部Lohit岩基的新数据，包括：(i) 5个花岗岩类约148 ~ 96 Ma的锆石U - Pb年龄；(2)这些岩石的锆石Hf同位素产生较高且正的εHf(T)值。
The Neo‐Tethyan subduction that operated before the India‐Asia collision resulted in an Andean‐type convergent margin in South Asia 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 Tibet, 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 Himalayan syntaxis. Here, we report new data from the Lohit Batholith, NE India, 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 εHf(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 Tibet to Southeast Asia.