Late Cretaceous high-Mg# granitoids in southern Tibet: implications for the early crustal thickening and tectonic evolution of the Tibetan Plateau?

Chen, Jian-Lin, Xu, Ji-Feng, Yu, Hong-Xia, Wang, Bao-Di, Wu, Jian-Bin and Feng, Yue-Xing (2015) Late Cretaceous high-Mg# granitoids in southern Tibet: implications for the early crustal thickening and tectonic evolution of the Tibetan Plateau?. Lithos, 232 12-22. doi:10.1016/j.lithos.2015.06.020

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Author Chen, Jian-Lin
Xu, Ji-Feng
Yu, Hong-Xia
Wang, Bao-Di
Wu, Jian-Bin
Feng, Yue-Xing
Title Late Cretaceous high-Mg# granitoids in southern Tibet: implications for the early crustal thickening and tectonic evolution of the Tibetan Plateau?
Journal name Lithos   Check publisher's open access policy
ISSN 1872-6143
0024-4937
Publication date 2015-09-01
Sub-type Article (original research)
DOI 10.1016/j.lithos.2015.06.020
Open Access Status File (Author Post-print)
Volume 232
Start page 12
End page 22
Total pages 11
Place of publication Amsterdam, Netherlands
Publisher Elsevier
Collection year 2016
Language eng
Formatted abstract
This study presents new major and trace element, plus Sr–Nd and zircon U–Pb isotope data for the Zhongcang granitic plutons, which are located to the south of the Yongzhu–Asuo ophiolite belt within the northwestern part of the central Lhasa subterrane, Tibetan Plateau. These data provide new insights into the Late Cretaceous tectonic evolution of southern Tibet. The Zhongcang plutons are dominated by granodiorites and granites that yield zircon U–Pb emplacement ages of 94–88 Ma. They can be further divided into metaluminous and peraluminous subtypes. The metaluminous rocks have adakite-like geochemical signatures, including high SiO2, Al2O3, and Sr concentrations, and low Yb and Y concentrations, and high Sr/Y and (La/Yb)N ratios. These rocks also have negative εNd(t) values (− 3.17 to − 0.17), variable initial 87Sr/86Sr(i) ratios (0.705927–0.707668), and high K2O and Th concentrations, suggesting that they were not derived from the partial melting of subducted oceanic crust in an arc setting. The Zhongcang adakitic rocks have higher MgO and Cr concentrations and Mg# values than do contemporaneous intrusive rocks derived from a region of thickened lower crust within the central Lhasa subterrane. These data suggest that the Zhongcang adakitic rocks were generated by the partial melting of a delaminated thickened lower crust within a Late Cretaceous continental setting. In comparison with the Zhongcang adakitic rocks, the peraluminous rocks have significant negative Eu and Sr anomalies and lower εNd(t) values (− 4.06 to − 6.64). This, combined with their high Mg# values, and Cr concentrations, suggests that the peraluminous units formed from primitive magmas similar to those that formed the Zhongcang adakitic rocks, but modified by contamination with ancient crustal material and by fractional crystallization of plagioclase and apatite during uprising and/or emplacement. The Zhongcang high-Mg# granitoids provide robust evidence for Late Cretaceous crustal thickening prior to India–Asia collision.
Keyword High-Mg# granitoids
Adakitic rocks
Late Cretaceous
Crustal thickening
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Earth Sciences Publications
Official 2016 Collection
 
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