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Provenance and tectonic setting of the Upper Palaeozoic sandstones in western Inner Mongolia (the Shalazhashan and Solonker belts), China: insights from detrital zircon U–Pb ages and Hf isotopes

Published online by Cambridge University Press:  14 December 2017

GUANZHONG SHI ,
GUANGZENG SONG ,
HUA WANG ,
CHUANYAN HUANG  and
BEN LI
GUANZHONG SHI
Affiliation:
Key Laboratory of Tectonics and Petroleum Resources, Ministry of Education, China University of Geosciences, Wuhan 430074, China Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, China
GUANGZENG SONG
Affiliation:
School of Resources and Environment, University of Ji'nan, Ji'nan 250022, China
HUA WANG*
Affiliation:
Key Laboratory of Tectonics and Petroleum Resources, Ministry of Education, China University of Geosciences, Wuhan 430074, China Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, China
CHUANYAN HUANG
Affiliation:
Key Laboratory of Tectonics and Petroleum Resources, Ministry of Education, China University of Geosciences, Wuhan 430074, China Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, China
BEN LI
Affiliation:
Institute of Petroleum Exploration and Development, PetroChina Huabei Oilfield Company, Cangzhou 062552, China
*
†Author for correspondence: wanghua@cug.edu.cn
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Abstract

The Solonker and Shalazhashan belts are hotly debated tectonic units of the Central Asian Orogenic Belt (CAOB), because they may either represent a Permian or Triassic suture zone of the CAOB, or a rifting zone overprinted on an Early Palaeozoic orogen. Provenance analysis of the Upper Palaeozoic sandstones in these belts may provide useful constraints on this issue. This study collected six sandstone samples from three study areas: the Mandula area of the Solonker Belt, the Quagan Qulu area of the Shalazhashan Belt but close to the Alxa block, and the Enger Us area of the Shalazhashan Belt, for framework petrography, zircon morphology, U–Pb and Lu–Hf isotopic analyses. Framework petrography reveals that the Mandula and Enger Us area samples contain high proportions of volcanic fragments, whereas the samples from the Quagan Qulu area include not only volcanic fragments but also significant amounts of biotite and muscovite. The detrital zircons of the Mandula area and the Enger Us area yield two main age groups: (i) 260–330 Ma, with dominant εHf(t) values of –5 to +12; and (ii) 420–550 Ma, with dominant εHf(t) values of –9 to +9, suggesting that Early Palaeozoic arc-related magmatic rocks and Late Palaeozoic syn-depositional volcanic rocks are the main source rocks. The detrital zircons of the Quagan Qulu area have one main age group of 420–500 Ma and some grains of 0.9–1.1 Ga, 1.4–1.5 Ga, 1.8–1.9 Ga and ~ 2.5 Ga, which derive from the northern margin of the Alxa block. The lithological and fossil assemblages of the Upper Palaeozoic sandstones suggest shallow-marine to deep-water depositional environments and a northward-deepening transition. Based on the zircon spectra, sedimentary environment analysis and previous studies, we argue that the Solonker Belt and the Shalazhashan Belt of the CAOB are in extensional basins of a fore-arc or rifting setting.

Keywords

provenance analysisdetrital zirconU–Pb agesAmushan FormationCAOB
Type
Original Articles
Information
Geological Magazine , Volume 156 , Issue 3 , March 2019 , pp. 547 - 571
Copyright
Copyright © Cambridge University Press 2017 

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