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Petrogenesis and tectonic significance of the Late Permian–Middle Triassic calc-alkaline granites in the Balong region, eastern Kunlun Orogen, China

Published online by Cambridge University Press:  29 February 2012

JIN-YANG ZHANG ,
CHANG-QIAN MA ,
FU-HAO XIONG  and
BIN LIU
JIN-YANG ZHANG*
Affiliation:
Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, China
CHANG-QIAN MA
Affiliation:
Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, China State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan 430074, China
FU-HAO XIONG
Affiliation:
Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, China
BIN LIU
Affiliation:
Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, China
*
†Author for correspondence: [email protected]
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Abstract

Numerous calc-alkaline granitoid intrusions in the eastern Kunlun Orogen provide a valuable opportunity to constrain the evolution of the orogen. The age and genesis of these intrusions, however, remain poorly understood. The granitoid intrusions near the Balong region, eastern Kunlun Orogen, consist of granodiorite, diorite and syenogranite. The granodiorite contains crystallized segregations, abundant mafic microgranular enclaves (MMEs) and small quartz diorite stocks. In situ zircon U–Pb dating reveals that the granodiorites and quartz diorites were emplaced between 263 and 241 Ma, whereas the syenogranite was produced at c. 231 Ma. The granodiorite and quartz diorite have a calc-alkaline affinity and are metaluminous and Na-rich, with slightly enriched Sr–Nd isotope compositions. The granodiorite is characterized by fractionated REE patterns, whereas the quartz diorite displays a relatively flat REE pattern. The MMEs are consistent with the granodiorite in terms of incompatible elements and Sr–Nd isotope composition. Compared to the granodiorite and diorite, the syenogranite has higher SiO2, K, Rb, Th and Sr contents and a lower Rb/Sr ratio. The results presented here, when combined with regional geological data, indicate that the granodiorite and quartz diorite were derived from dehydration melting of mafic lower crustal rocks during the N-directed subduction of the Anyemaqen ocean lithosphere in Late Permian–Middle Triassic times, whereas the syenogranite was produced at a higher crustal level in a syn-collisional setting compared to the granodiorite.

Keywords

calc-alkalineocean subductioncollisiongranitoid intrusionsKunlun Orogen
Type
Original Articles
Information
Geological Magazine , Volume 149 , Issue 5 , September 2012 , pp. 892 - 908
Copyright
Copyright © Cambridge University Press 2012

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