原文服务方: 地球化学学报(英文)       
摘要:
First comprehensive investigations of the Cuonadong leucogranite exposed in North Himalayan gneiss dome of southern Tibet are presented in this study. The SIMS U-Pb ages of oscillatory zircon rims scatter in a wide range from 34.1 to 16.0 Ma, and the Cuonadong leucogranite probably emplaced at 16.0 Ma. High-precision 40Ar/39Ar dating on a muscovite sample yields an essentially flat age spectrum with consistent plateau and isochron ages, indicating that the Cuonadong leucogranite cooled below 450 ℃ at 14 Ma. Based on the youngest zircon U-Pb age and muscovite 40Ar/39Ar age, the Cuonadong leucogranite experienced rapid cooling with a rate of 119 ℃/Myr from 16 to 14 Ma. The geochronological data of this undeformed leucogranite also suggest that the ductile extension of the South Tibetan Detachment System in the eastern Himalaya ceased by ca. 14 Ma. Furthermore, the initial Sr-Nd isotopic compositions and Nd model ages demonstrate that the leucogranite was derived from metapelitic source within the Greater Himalayan Crystalline Complex. The distinct Ba depletion with high Rb/Sr ratios and negative Eu anomalies make it clear that the leucogranite melts were generated by breakdown of muscovite under fluid-absent conditions.
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篇名 Geochronological and geochemical constraints on the Cuonadong leucogranite, eastern Himalaya
来源期刊 地球化学学报(英文) 学科
关键词 Leucogranite SIMS zircon U-Pb dating 40Ar/39Ar dating Geochemistry North Himalaya
年,卷(期) 2022,(3) 所属期刊栏目
研究方向 页码范围 347-359
页数 12页 分类号
字数 语种 英文
DOI 10.1007/s11631-018-0273-8
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Leucogranite
SIMS zircon U-Pb dating
40Ar/39Ar dating
Geochemistry
North Himalaya
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地球化学学报(英文)
双月刊
2096-0956
52-1161/P
大16开
贵州省贵阳市观水路46号地球化学研究所
1982-01-03
英文
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