Geochronology, Geochemistry, and In Situ Sr-Nd-Hf Isotopic Compositions of a Tourmaline-Bearing Leucogranite in Eastern Tethyan Himalaya: Implications for Tectonic Setting and Rare Metal Mineralization

Author:

Drolma Yangchen1,Li Kaijun1,Li Yubin1,Zhang Jinshu1,Yang Chengye1,Zhang Gen1,Li Ruoming1,Liu Duo1

Affiliation:

1. School of Engineering, Tibet University, Lhasa 850000, China

Abstract

Himalayan leucogranite is an excellent target for understanding the orogenic process of the India–Asia collision, but its origin and tectonic significance are still under debate. An integrated study of geochronology, geochemistry, and in situ Sr-Nd-Hf isotopes was conducted for a tourmaline-bearing leucogranite in the eastern Tethyan Himalaya using LA-ICP-MS, X-ray fluorescence spectroscopy, and ICP-MS and LA-MC-ICP-MS, respectively. LA-ICP-MS U-Pb dating of zircon and monazite showed that it was emplaced at ~19 Ma. The leucogranite had high SiO2 and Al2O3 contents ranging from 73.16 to 73.99 wt.% and 15.05 to 15.24 wt.%, respectively. It was characterized by a high aluminum saturation index (1.14–1.19) and Rb/Sr ratio (3.58–6.35), which is characteristic of S-type granite. The leucogranite was enriched in light rare-earth elements (LREEs; e.g., La and Ce) and large ion lithophile elements (LILEs; e.g., Rb, K, and Pb) and depleted in heavy rare-earth elements (e.g., Tm, Yb, and Lu) and high field strength elements (HFSEs; e.g., Nb, Zr, and Ti). It was characterized by high I Sr (t) (0.7268–0.7281) and low ε Nd (t) (−14.6 to −13.2) and ε Hf (t) (−12.6 to −9.47), which was consistent with the isotopic characteristics of the Higher Himalayan Sequence. Petrogenetically, the origin of the leucogranite is best explained by the decompression-induced muscovite dehydration melting of an ancient metapelitic source within the Higher Himalayan Sequence during regional extension due to the movement of the South Tibetan Detachment System (STDS). The significantly high lithium and beryllium contents of the leucogranite and associated pegmatite suggest that Himalayan leucogranites possess huge potential for lithium and beryllium exploration.

Funder

key research and development program of Xizang Autonomous Region

2023 Central Government Support Fund for Reform and Development of Local Universities

Fundamental Research Funds for National Natural Science Foundation of China

Major Science and Technology Project of Xizang Autonomous Region

Second Tibetan Plateau Scientific Expedition and Research Program

Publisher

MDPI AG

Reference86 articles.

1. Geologic evolution of the Himalayan–Tibetan orogen;Yin;Annu. Rev. Earth Planet. Sci.,2000

2. Cenozoic tectonic evolution of Asia: A preliminary synthesis;Yin;Tectonophysics,2010

3. Metallogenesis in Tibetan collisional orogenic belt: Ⅲ. Mineralization in post-collisional extension setting;Hou;Miner. Depos.,2006

4. Himalayan leucogranite: Petrogenesis and implications to orogenesis and plateau uplift;Wu;Acta Petrol. Sin.,2015

5. Highly fractionated Himalayan leucogranites and associated rare-metal mineralization;Wu;Lithos,2020

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