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Zircon records of Miocene ultrapotassic rocks from southern Lhasa subterrane, Tiben Plateau.

Liu, D. and Zhao, Z.D. and Zhu, D.C. and Niu, Y.L. and Liu, S.A. and Wang, Q. and Liu, Y.S. and Hu, Z.C. (2013) 'Zircon records of Miocene ultrapotassic rocks from southern Lhasa subterrane, Tiben Plateau.', 岩石学报. = Acta petrologica Sinica., 29 (11). pp. 3703-3715.


Zircons entrained in mantle-derived magmas offer a prime opportunity to reveal cryptic magmatic episodes in the deep crust. We have investigated zircons from mantle-derived ultrapotassic veins in the Xuena area, southern Lhasa subterrane. Zircons in the Xuena ultrapotassic rocks reveal four major magmatic pulses around <100Ma, 300 ~ 400Ma, 450 ~ 500Ma, and 700 ~ 850Ma. The high U / Yb ratios and low Y contents of these zircons demonstrate their continental origin. Cenozoic-Mesozoic and Late Paleozoic magmatism have been widely identified from the southern Lhasa subterrane, suggesting the contribution from overlying juvenile crust. But similar Proterozoic-Early Paleozoic age distributions (450 ~ 500Ma and 700 ~ 850Ma) between these zircon xenocrysts and those dating records in the Himalayan orogenic belt corroborate the input from underthrusted Indian continental crust. Furthermore, the Increasing (Dy / Yb) N ratio since ~ 60 Ma zircon and Rapid Decreasing epsilon Hf ( t ) values, from + 10 ~ + 5 to -10 ~ -25, are Interpreted to reflect Significant and progressive Crustal Thickening in Response to India-Asia convergence and the contribution from subducted Indian continental crust to postcollisional magmatism in the southern Lhasa sub-terrane.

Item Type:Article
Keywords:Zircon, Ultrapotassic vein, U-Pb dating, Hf isotope, Xuena area, Lhasa terrane, Tibet Plateau.
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Date accepted:10 August 2013
Date deposited:24 June 2015
Date of first online publication:2013
Date first made open access:No date available

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