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Late Archaean to Palaeoproterozoic evolution of the Trans-North China Orogen: insights from synthesis of existing data from the Hengshan–Wutai–Fuping belt

By
Guochun Zhao
Guochun Zhao
1
Department of Earth Sciences, The University of Hong Kong
,
Pokfulam Road, Hong Kong
gzhao@hkucc.hku.hk
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Min Sun
Min Sun
1
Department of Earth Sciences, The University of Hong Kong
,
Pokfulam Road, Hong Kong
gzhao@hkucc.hku.hk
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Simon A. Wilde
Simon A. Wilde
2
Department of Applied Geology, Curtin University of Technology
,
GPO Box U1987, Perth 6845, Australia
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Jinghui Guo
Jinghui Guo
3
Institute of Geology and Geophysics, Chinese Academy of Sciences
,
Beijing, 100029, China
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Published:
January 01, 2004

Abstract

The Hengshan–Wutai–Fuping mountain belt constitutes the middle segment of the Trans-North China Orogen, which separates the North China Craton into the Eastern and Western Blocks. The belt consists of the high-grade Hengshan and Fuping complexes, and the intervening low- to medium-grade Wutai Complex. Previous tectonic models assumed that the high-grade complexes were an older basement (Archaean to Palaeoproterozoic) to the low-grade Wutai Complex. However, new geochronological data show that the emplacement of granitoid rocks and eruption of volcanic rocks in the Wutai Complex occurred essentially coeval with or slightly earlier than intrusion of the tonalitic–trondhjemitic–granodioritic (TTG) suites in the Hengshan and Fuping complexes. New isotopic data also reveal the widespread presence of Palaeoproterozoic granitoid rocks in these complexes. Structural and metamorphic data demonstrate similar tectonothermal histories for the three complexes, which are characterized by peak medium- to high-pressure metamorphism accompanied by the development of thrusting, isoclinal folding (F2) and penetrative foliations, followed by near-isothermal decompression and cooling and retrogression associated with the formation of large-scale ductile shear zones and asymmetrical folds (F3) with nearly vertical axial planes. These geochronological, structural and metamorphic data suggest that the tectonic evolution of the Hengshan–Wutai–Fuping mountain belt may not be related to local interaction of the three complexes, as suggested in earlier models, either through closure of a Wutai rift or collision between a Wutai arc and the Hengshan and Fuping micro-continental blocks. Instead, they may represent elements of a single Late Archaean to Early Palaeoproterozoic magmatic arc that was subsequently incorporated into the Trans-North China Orogen along which the Eastern and Western blocks amalgamated to form the North China Craton at around 1.85 Ga.

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Contents

Geological Society, London, Special Publications

Aspects of the Tectonic Evolution of China

J. Malpas
J. Malpas
The University of Hong Kong, Hong Kong
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C. J. N. Fletcher
C. J. N. Fletcher
The University of Hong Kong, Hong Kong
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J. R. Ali
J. R. Ali
The University of Hong Kong, Hong Kong
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J. C. Aitchison
J. C. Aitchison
The University of Hong Kong, Hong Kong
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Geological Society of London
Volume
226
ISBN electronic:
9781862394742
Publication date:
January 01, 2004

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