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Slab break-off origin of 105 Ma A-type porphyritic granites in the Asa area of Tibet

Published online by Cambridge University Press:  26 February 2020

Hang Li
Affiliation:
College of Earth Sciences, Jilin University, Changchun, 130061, China
Ming Wang*
Affiliation:
College of Earth Sciences, Jilin University, Changchun, 130061, China Key Laboratory of Mineral Resources Evaluation in Northeast Asia, Ministry of Land and Resources, Jilin University, Changchun, 130061, China
Xiao-Wen Zeng
Affiliation:
College of Earth Sciences, Jilin University, Changchun, 130061, China
An-Bo Luo
Affiliation:
College of Earth Sciences, Jilin University, Changchun, 130061, China
Yun-Peng Yu
Affiliation:
College of Earth Sciences, Jilin University, Changchun, 130061, China
Xian-Jin Zeng
Affiliation:
College of Earth Sciences, Jilin University, Changchun, 130061, China
*
Author for correspondence: Ming Wang, Email: wm609@163.com

Abstract

The study of the petrogenesis of some magmatic rocks with special geochemical attributes provides effective information for us to explore the deep geodynamic background of their formation. A series of granitic porphyry dykes have been found in the mélange zone of the Asa region in southern Tibet, whose genesis may be closely related to the evolution of the Meso-Tethyan Ocean. Regional geodynamic evolution is investigated by whole-rock geochemical analysis, zircon U–Pb dating and Lu–Hf isotopic analysis of two porphyritic granites. The Asa porphyritic granites have high SiO2 (74.29–78.65 wt %) and alkalis (Na2O + K2O = 6.51–9.35 wt %) contents, and low Al2O3 (11.60–14.51 wt %), CaO (0.04–0.19 wt MgO (0.01–0.10 wt %) contents. They are enriched in Zr, Nb, Ce, Y and Hf and depleted in Ti, Ba, Sr and P, consistent with A-type granites. The samples are relatively rich in LREEs, with LREE/HREE ratios of 1.73–3.04. They display negative Eu anomalies (Eu/Eu* = 0.24–0.28) and obvious Ce anomalies in some samples. Zircon U–Pb analyses show that the porphyritic granites formed in late Early Cretaceous time, 107.4 to 105.5 Ma. Zircon εHf(t) values are in the range of 6.9 to 12.0. These data indicate that the porphyritic granites were sourced from interaction between mantle-derived and juvenile lower crust-derived melts, with the addition of oceanic sediment-derived melts. This occurred when the subducting Bangong–Nujiang oceanic crust split to create a slab window. Rising asthenosphere triggered re-melting of lower crust basalts, resulting in the formation of the late Early Cretaceous A-type granites around Asa.

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Original Article
Copyright
© Cambridge University Press 2020

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Slab break-off origin of 105 Ma A-type porphyritic granites in the Asa area of Tibet
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