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Early Permian subduction-related transtension in the Turpan Basin, East Tianshan (NW China): implications for accretionary tectonics of the southern Altaids

Published online by Cambridge University Press:  14 November 2019

Qigui Mao
Affiliation:
Beijing Institute of Geology for Mineral Resources, Beijing100012, China Deep Exploration Technic Center for Non-ferrous Mines, Beijing10012, China
Wenjiao Xiao*
Affiliation:
Xinjiang Research Center for Mineral Resources, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi830011, China College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing100049, China
Brian F. Windley
Affiliation:
Department of Geology, University of Leicester, LeicesterLE1 7RH, UK
Minjie Yu
Affiliation:
Beijing Institute of Geology for Mineral Resources, Beijing100012, China
Min Sun
Affiliation:
Department of Earth Sciences, University of Hong Kong, Hong Kong, China
Songjian Ao
Affiliation:
College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing100049, China State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing100029, China
Ji’en Zhang
Affiliation:
College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing100049, China State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing100029, China
*
Author for correspondence: Wenjiao Xiao, Email: [email protected]

Abstract

The interaction of the Palaeo-Pacific and Palaeo-Asian Oceans is an enigmatic issue as their temporal and spatial features are controversial. To address this issue, we present a systematic study of large volumes of early Permian volcanic rocks and intrusions developed in the East Tianshan. The represented samples of basaltic andesites and rhyolites yield zircon crystallization ages of 285.1 ± 5.9 Ma and 275.3 ± 1.8 Ma, respectively. The basalts have normal mid-ocean ridge basalt (N-MORB) and arc-related geochemical signatures with high TiO2 contents, negative Rb, Th, U, Nb and Ta anomalies and positive Eu anomalies. Basaltic andesites and andesites have arc-related geochemical characteristics with moderate TiO2 contents and relatively negative Nb, Ta and Ti anomalies, together with slightly negative to positive Eu anomalies. The rhyolites show an affinity with A2-type granite with high SiO2, K2O + Na2O, Fe/Mg, Ga, Zr, Nb, Y, HFSE, REE and Y/Nb levels (>1.2). These geochemical data suggest that the rocks formed in a supra-subduction zone. The presence of high ϵNd(t) values of +4.6 to +8.2 and low (87Sr/86Sr)i (0.70342–0.70591) values indicates that the volcanic rocks originated from a depleted mantle. We propose that oblique subduction with slabs breaking off gave rise to transtension and to the emplacement of large volumes of mantle-derived melts in the early Permian in the East Tianshan, serving as an important record of the subduction zone of the Palaeo-Pacific Ocean.

Type
Original Article
Copyright
© Cambridge University Press 2019

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