西藏错那洞穹窿同构造矽卡岩特征及相关铍钨锡稀有金属矿化的成矿时代

doi:10.13278/j.cnki.jjuese.20190285

Abstract

Abstract: The newly discovered Cuonadong dome is located in the eastern part of the northern Himalayan gneiss domes (NHGD), which consists of three lithologic-tectonic units, i.e., core, detachment system,and cover rocks. Cuonadong super-large Be-W-Sn rare metals deposit is hosted by skarn and skarn marble in the middle of the dome. The skarn and/or skarnization marble are located in garnet-staurolite-bearing mica schist, and are closely related to the intensively deformed leucogranite and pegmatite, and some skarn minerals are in directional arrangement with strong shear characteristics (i.e. garnet, epidote and amphibole). The boundary between leucogranite and skarn is gradual or sharp, which suggests that both the skarn and the deformed leucogranite were resulted from the syntectonic magmatism.The Ar-Ar dating of biotite from the ore-hosting schist yields Ar-Ar plateau age of (16.6±0.3) Ma and inverse isochronal age of (16.7±0.3) Ma, which represent the age of D₂ top-to north extension deformation, and also represent the activity time of the southern Tibetan detachment system (STDS) of Cuonadong dome. The Ar-Ar dating of muscovite from skarn in Cuonadong dome yields Ar-Ar plateau age of (16.9±0.2) Ma, which is consistent with the Ar-Ar plateau age of (16.6±0.3) Ma in schist, and represent the formation age of the syntectonic skarns, which is interpreted as the mineralization age of Cuonadong Be-W-Sn rare metals deposit. Therefore, we suggest that Cuonadong Be-W-Sn rare metals deposit was resulted from the activity of the STDS, and the syntectonic magma intruded in the host rocks along the structural passage, further replaced the marble, which, in turn, resulted in the formation of the Be-W-Sn-bearing skarn ore bodies.

Key words: syntectonic skarn, rare metals, Ar-Ar dating, Cuonadong dome, Cuonadong Be-W-Sn rare metals deposits, north Himalaya

CLC Number:

P597

Fu Jiangang, Li Guangming, Wang Genhou, Zhang Linkui, Liang Wei, Zhang Xiaoqiong, Jiao Yanjie, Dong Suiliang. Syntectonic Skarn Characteristics and Mineralization Age of Associated Be-W-Sn Rare Metal Deposit in Cuonadong Dome, Southern Tibet, China[J].Journal of Jilin University(Earth Science Edition), 2020, 50(5): 1304-1322.

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Syntectonic Skarn Characteristics and Mineralization Age of Associated Be-W-Sn Rare Metal Deposit in Cuonadong Dome, Southern Tibet, China

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