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Origin and tectonic implications of Early Cretaceous high- and low-Mg series rocks and mafic enclaves in the Bomi–Chayu Fold Belt, SE Tibet

Published on Jun 1, 2019in Lithos3.913
· DOI :10.1016/j.lithos.2019.03.018
Xiaohan Dong1
Estimated H-index: 1
(CAS: Chinese Academy of Sciences),
Touping Peng25
Estimated H-index: 25
(CAS: Chinese Academy of Sciences)
+ 8 AuthorsLin-Li Chen3
Estimated H-index: 3
(CAS: Chinese Academy of Sciences)
Abstract
Abstract Early Cretaceous granitoids are widespread on the Tibetan Plateau and record the tectonic evolution of several Tethyan oceans. We describe Early Cretaceous high-Mg (Mg #  > 50) and low-Mg (Mg # Pb dating reveals two episodes of granitoid emplacement at ~122 and ~117 Ma. High-Mg series rocks have higher Mg # and compatible element concentrations (e.g., Cr and Ni) than low-Mg series samples. Their Mg # and compatible element abundances are also elevated relative to an experimental melt generated under the conditions of a thickened lower crustal. Enriched whole-rock Nd and zircon Hf isotopic signatures, coupled with low Y (
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