Recognizing different types of ocean plate stratigraphy in the southeastern South Qilian Accretionary Belt, northeastern Tibet Plateau

Author:

Tao Lu1ORCID,Zhang Hongfei12,Gao Zhong3,Lu Zhuo4,Yang He5,Zhang Liqi6

Affiliation:

1. State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan 430074, P.R. China

2. School of Earth Sciences, China University of Geosciences, Wuhan 430074, P.R. China

3. Hubei Key Laboratory of Mine Environmental Pollution Control & Remediation, Hubei Polytechnic University, Huangshi, Hubei 435003, P.R. China

4. School of Jewelry, West Yunnan University of Applied Sciences, Tengchong, Yunnan 679100, P.R. China

5. Xinjiang Research Center for Mineral Resources, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, P.R. China

6. Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, P.R. China

Abstract

Dissection of relicts of ocean plate stratigraphy (OPS) in orogens could provide important insights into oceanic evolution, orogenic formation and continental growth. Here we describe a study of petrology, geochronology, geochemistry and Sr–Nd isotopes for OPS in the South Qilian Accretionary Belt with the aim of providing new constraints on the evolution of the Proto-Tethys Ocean (PTO). Three types of OPS units were recognized by their differing petrological, geochemical and isotopic features. Type 1 OPS, representing relicts of ocean islands or seamounts, comprises ocean island basalt and gabbro (t = 525 ± 4 Ma, (87Sr/86Sr)i = 0.7035–0.7039 andεNd(t) = +3.63 to +4.16) and (siliceous) carbonate rocks. Type 2 OPS, representing fragments of normal oceanic crust, consists of normal mid-ocean ridge basalt (N-MORB) and basaltic andesite ((87Sr/86Sr)i = 0.7059–0.7063 andεNd(t) = +6.33 to +7.44), chert and siliceous mudstone. Type 3 OPS could be oceanic plateau-derived and comprises enriched (E)-MORB and dolerite ((87Sr/86Sr)i = 0.7051–0.7064 andεNd(t) = +4.81 to +6.24), carbonate–siliceous mudstone and carbonate rock. These OPS units witnessed evolution of the PTO. Using available studies on regional arc-type magmatism and U–Pb geochronological data for detrital zircon in this study, a model of ‘trench jam accompanying subduction flip induced by accretion of the OPS’ is put forward.Supplementary material: Zircon U–Pb data, whole-rock major and trace element data and a supplementary figure are available athttps://doi.org/10.6084/m9.figshare.c.6764637Thematic collection:This article is part of the Ophiolites, melanges and blueschists collection available at:https://www.lyellcollection.org/topic/collections/ophiolites-melanges-and-blueschists

Funder

National Science Foundation of China

China Postdoctoral Science Foundation

Publisher

Geological Society of London

Subject

Geology

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