期刊
SCIENCE BULLETIN
卷 62, 期 6, 页码 415-424出版社
ELSEVIER
DOI: 10.1016/j.scib.2017.02.003
关键词
Granitic gneiss; Neoproterozoic magmatism; Zircon U-Pb dating; Eastern Himalaya
资金
- National Natural Science Foundation of China [41425010, 41273034]
- Public Welfare Industry Scientific Special Expenditure [201511022]
- China Geological Survey Project [12120115027101, 12120114022701]
Geochronological investigation on gneisses of granitic to leucogranitic compositions in Cuona, south Tibet, reveal that their protoliths formed at 808.8 +/- 7.9-816.4 +/- 3.4 Ma and 855.8 +/- 7.0 Ma, respectively. Zircon rims from the granitic gneiss record a metamorphic age of 739.4 +/- 4.3 Ma. Lu-Hf isotopic analyses on zircon grains with Neoproterozoic ages yield negative epsilon(Hf)(t) values from -9.0 to -4.2, and the corresponding two-stage Hf model ages are 1965-2228 Ma. Whole-rock geochemical data indicate that all granitic gneisses are K-riched calc-alkali series. These new data together with literature data show that (1) the Himalayan terrane experienced an episode of Neoproterozoic magmatism at 850-800 Ma; (2) the Neoproterozoic magma of granitic compositions were derived from partial melting of ancient crusts, possibly due to the thermal perturbation related with the breakup of the Rodinia supercontinent. (C) 2017 Science China Press. Published by Elsevier B.V. and Science China Press. All rights reserved.
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