Preprint Article Version 1 This version is not peer-reviewed

Petrogenesis and Tectonic Setting of a Granitic Pluton in the Northern Ya-Gan fault Zone, North Alxa, China: Constraints from Whole-Rock Geochemistry, Zircon U–Pb Ages, and Sr–Nd–Hf Isotope Compositions

Version 1 : Received: 17 June 2018 / Approved: 22 June 2018 / Online: 22 June 2018 (05:04:29 CEST)

How to cite: Xie, F.; Wu, Q.; Wang, L.; Shi, Z.; Xiao, W.; Cao, J.; Liu, B.; Jiang, J.; Song, J. Petrogenesis and Tectonic Setting of a Granitic Pluton in the Northern Ya-Gan fault Zone, North Alxa, China: Constraints from Whole-Rock Geochemistry, Zircon U–Pb Ages, and Sr–Nd–Hf Isotope Compositions. Preprints 2018, 2018060344 (doi: 10.20944/preprints201806.0344.v1). Xie, F.; Wu, Q.; Wang, L.; Shi, Z.; Xiao, W.; Cao, J.; Liu, B.; Jiang, J.; Song, J. Petrogenesis and Tectonic Setting of a Granitic Pluton in the Northern Ya-Gan fault Zone, North Alxa, China: Constraints from Whole-Rock Geochemistry, Zircon U–Pb Ages, and Sr–Nd–Hf Isotope Compositions. Preprints 2018, 2018060344 (doi: 10.20944/preprints201806.0344.v1).

Abstract

A series of precise data consisting of zircon U–Pb ages, whole-rock geochemistry and Sr–Nd–Hf isotope compositions from the Huhetaoergai granitic pluton was collected in this study and combined with data from the western Huhetaoergai, Zhuxiaogubuhe and Yagan granitic plutons to constrain the petrogenesis and tectonic setting of granitic plutons in the northern Ya-Gan fault zone, North Alxa, China. The Huhetaoergai pluton is composed of hornblende diorite, medium- to coarse-grained biotite adamellite and coarse-grained biotite adamellite with K-feldspar megacrysts. The U–Pb zircon ages of biotite adamellite are 220.5 ± 1.9 Ma and 226.5 ± 2.4 Ma. These granitoids are I-type granites with highly radiogenic initial 87Sr/86Sr of 0.708085–0.735470, negative eNd(t) average values of −2.98–3.23 and high eHf(t) of 9–11.05. These features indicate the granitoids were formed from magmas generated from juvenile crust. We speculate that the granitoids of the Huhetaoergai pluton were emplaced during an episode of intense intraplate orogenic movement evolution in an extrusional setting after a period of extensional postcollisional intraplate evolution.

Subject Areas

hetaoergai pluton; Yagan Belt; I-type granites; geochemistry; zircon U–Pb dating; Sr–Nd–Hf isotopes

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