Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/114081
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Type: Journal article
Title: Final subduction processes of the Paleo-Asian Ocean in the Alxa Tectonic Belt (NW China): Constraints from field and chronological data of Permian arc‐related volcano‐sedimentary rocks
Author: Song, D.
Xiao, W.
Collins, A.
Glorie, S.
Han, C.
Li, Y.
Citation: Tectonics, 2018; 37(6):1658-1687
Publisher: American Geophysical Union
Issue Date: 2018
ISSN: 0278-7407
1944-9194
Statement of
Responsibility: 
Dongfang Song, Wenjiao Xiao, Alan S. Collins, Stijn Glorie, Chunming Han, and Yongchen Li
Abstract: The timing of final subduction and closure of the Paleo-Asian Ocean (PAO) is controversial. Located in a key position within the southern Central Asian Orogenic Belt, the Alxa Tectonic Belt (ATB) provides a crucial window to evaluate the final subduction processes of the PAO. This study presents field and geochronological data for Permian volcano-sedimentary rocks from the southwestern ATB. Field observations revealed a syntectonic unconformity between the Middle and Upper Permian strata. Detrital zircon U-Pb analyses show a major peak at ~273 Ma and a subordinate peak at ~440 Ma for the Middle Permian sample. The Upper Permian samples show consistently unimodal age spectra with single peaks at ~261 and ~263 Ma, respectively. The Permian zircons from the analyzed samples yield predominately positive εHf(t) values, indicating major juvenile magmatic processes mixed with limited recycled Precambrian basement. The diagnostic zircon U-Pb-Hf isotopic characteristics and ubiquitous intermediate and felsic volcanic detritus in these rocks indicate rapid sediments accumulation sourced from a proximal magmatic terrane in a suprasubduction zone environment. The Paleozoic zircon U-Pb age peaks from this study are comparable to those for the Permian arc-related sediments along the Solonker Suture Zone, thus linking the Alxa active margin with the northern margin of the North China Craton during Middle-Late Permian times. Our study thus provides key constraints for the final subduction processes of the PAO, documented within the ATB, before the terminal amalgamation of the southern Central Asian Orogenic Belt.
Description: Published online 5 JUN 2018
Rights: ©2018. American Geophysical Union. All Rights Reserved.
RMID: 0030090854
DOI: 10.1029/2017TC004919
Grant ID: http://purl.org/au-research/grants/arc/DP150101730
Appears in Collections:Earth and Environmental Sciences publications

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