D. Liu
Zircon records of Miocene ultrapotassic rocks from southern Lhasa subterrane, Tiben Plateau
Liu, D.; Zhao, Z.D.; Zhu, D.C.; Niu, Yaoling; Liu, S.A.; Wang, Q.; Liu, Y.S.; Hu, Z.C.
Authors
Z.D. Zhao
D.C. Zhu
Yaoling Niu
S.A. Liu
Q. Wang
Y.S. Liu
Z.C. Hu
Abstract
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.
Citation
Liu, D., Zhao, Z., Zhu, D., Niu, Y., Liu, S., Wang, Q., …Hu, Z. (2013). Zircon records of Miocene ultrapotassic rocks from southern Lhasa subterrane, Tiben Plateau. Yanshi xuebao 岩石学报 (Online) (网络版), 29(11), 3703-3715
Journal Article Type | Article |
---|---|
Acceptance Date | Aug 10, 2013 |
Publication Date | Aug 10, 2013 |
Deposit Date | Nov 13, 2014 |
Publicly Available Date | Jun 24, 2015 |
Journal | Yan shi xue bao = Acta petrologica Sinica |
Print ISSN | 1000-0569 |
Electronic ISSN | 2095-8927 |
Publisher | 科学出版社 = Science Press |
Peer Reviewed | Peer Reviewed |
Volume | 29 |
Issue | 11 |
Pages | 3703-3715 |
Keywords | Zircon, Ultrapotassic vein, U-Pb dating, Hf isotope, Xuena area, Lhasa terrane, Tibet Plateau. |
Publisher URL | http://www.ysxb.ac.cn/ysxb/ch/reader/view_abstract.aspx?flag=1&file_no=20131105&journal_id=ysxb |
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