冈底斯中段容果地区二长花岗岩锆石U-Pb年龄及其地球化学特征

doi:10.19388/j.zgdzdc.2020.04.09

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Abstract In order to determine the geochronology, petrogenesis and tectonic background of the monzonitic granite in Rongguo area, the authors conducted the research on petrology, LA-ICP-MS zircon U-Pb geochronology and geochemistry. The results show that the zircons from the monzonitic granite are of magmatic genesis, and the zircon ²⁰⁶Pb/²³⁸U dating is (69±1) Ma, belonging to the Late Cretaceous. Al₂O₃, Na₂O, K₂O contents and K₂O/Na₂O ratio are 13.83%~14.41%, 3.68%~3.94%, 4.28%~4.35% and 1.08~1.18 respectively. The average aluminum saturation index (A/CNK) is 1.02, belonging to the weak peraluminous series. The rocks are enriched in LILE (Rb,U,K), strongly depleted in HFSE (Nb, Ta, Ti, etc.). Combined with the study of regional tectonics, the authors insisted that magma activity had not stopped from 80 to 69 Ma. The rock mass is the magmatic product of the subduction of the Neo-Tethys Ocean, forming in the orogenic environment during the whole orogenic movement period.

Key words： monzonitic granite geochemistry LA-ICP-MS zircon U-Pb age Gangdise

Received: 31 July 2019

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	HU Lin
	XU Gang
	LIU Daming

Cite this article:

HU Lin,XU Gang,LIU Daming. Zircon U-Pb ages and geochemistry of the monzonitic granite in Rongguo area in Middle Gangdise Belt[J]. , 2020, 7(4): 67-75.

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http://www.zgdzdcbjb.com/EN/10.19388/j.zgdzdc.2020.04.09 OR http://www.zgdzdcbjb.com/EN/Y2020/V7/I4/67

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