Petrogenesis and Tectonic Implications of the Paiku Leucogranites, Northern Himalaya

Zhengbin Gou; Xin Dong; Baodi Wang

doi:10.1007/s12583-019-1219-8

Volume 30 Issue 3

Jun 2019

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Journal of Earth Science > 2019 > 30(3): 525-534.

Zhengbin Gou, Xin Dong, Baodi Wang. Petrogenesis and Tectonic Implications of the Paiku Leucogranites, Northern Himalaya. Journal of Earth Science, 2019, 30(3): 525-534. doi: 10.1007/s12583-019-1219-8

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Zhengbin Gou, Xin Dong, Baodi Wang. Petrogenesis and Tectonic Implications of the Paiku Leucogranites, Northern Himalaya. Journal of Earth Science, 2019, 30(3): 525-534. doi: 10.1007/s12583-019-1219-8

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Petrogenesis and Tectonic Implications of the Paiku Leucogranites, Northern Himalaya

doi: 10.1007/s12583-019-1219-8

1.
Chengdu Center, China Geological Survey, Chengdu 610081, China
2.
Key Laboratory of Deep-Earth Dynamics of Ministry of Natural Resources, Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China

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Corresponding author: Xin Dong
Received Date: 25 Nov 2018
Accepted Date: 28 Mar 2019
Publish Date: 01 Jun 2019

Abstract

Abstract

The Himalayan leucogranites provide insights into the partial melting behavior of relatively deeper crustal rocks and tectono-magmatic history of the Himalayan Orogen. The Paiku leucogranites of northern Himalaya can be subdivided into two-mica leucogranite (TML), garnet-bearing leucogranite (GL), cordierite-bearing leucogranite (CL), and tourmaline-bearing leucogranite (TL). All of them are high-K, peraluminous, calc-alkalic to alkali-calcic rocks. They are enriched in light rare earth elements (LREE) and large ion lithophile elements (LILE), and show pronounced negative anomalies of Sr, Ba, K and Ti, but positive anomalies of Nb and Rb. LA-ICP-MS U-Pb zircon dating of one TML, one GL, and two CL samples yielded variable ²⁰⁶Pb/²³⁸U ages ranging from 23.6 to 16.1 Ma, indicating the Paiku leucogranites underwent a low degree of partial melting process. Combining with previous studies, we suggest the Paiku leucogranites were derived from partial melting of metasedimentary rocks of the Higher Himalayan Sequence (HHS). The GL and TL mainly resulted from the muscovite-dehydration melting, whereas the TML and CL were mainly derived from the biotite-dehydration melting. Finally, it is concluded that the Paiku leucogranites were probably formed during the subduction of the Indian crust.
- Paiku leucogranites,
- petrochemistry,
- U-Pb geochronology,
- dehydration melting,
- tectonic implications,
- northern Himalaya

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