Early Paleozoic magmatism along the northern margin of East Gondwana

Zircon UPb analyses of granitic gneisses from the gneiss domes (Xiaru, Mabja, Lhagoi Kangri, and Kangmar)within the Tethyan Himalaya and from the High Himalaya (Gyirong, Yadong, and Namche Barwa)yield that their protolith ages range from 509 Ma to 429 Ma. Similar to the Himalayan Cenozoic leucograni...

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Bibliographic Details
Published in:Lithos 2019-06, Vol.334-335 (C), p.25-41
Main Authors: Gao, Li-E, Zeng, Lingsen, Hu, Guyue, Wang, Yaying, Wang, Qian, Guo, Chunli, Hou, Kejun
Format: Article
Language:English
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Granitic gneisses
Northern margin of Gondwana
Paleozoic
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Summary:Zircon UPb analyses of granitic gneisses from the gneiss domes (Xiaru, Mabja, Lhagoi Kangri, and Kangmar)within the Tethyan Himalaya and from the High Himalaya (Gyirong, Yadong, and Namche Barwa)yield that their protolith ages range from 509 Ma to 429 Ma. Similar to the Himalayan Cenozoic leucogranites, the Paleozoic granites are characterized by (1) high SiO2 (69.9–77.0 wt%), Al2O3 (12.4–16.1 wt%), K2O + Na2O (5.8–10.3 wt%) with K2O/Na2O > 1.0 and A/CNK > 1.0; (2) large variations in Rb (166–851 ppm), Sr (20–172 ppm), Ba (27–1474 ppm) and Rb/Sr ratios (1.0–38.3); (3) low degrees of LREE over HREE fractionation with (La/Yb)N 
ISSN:0024-4937
1872-6143
DOI:10.1016/j.lithos.2019.03.007