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The Hudesheng mafic–ultramafic intrusions in the Oulongbuluke Block, Qinghai Province, NW China: chronology, geochemistry, isotopic systematics and tectonic implications

Published online by Cambridge University Press:  19 December 2018

Haoran Li ,
Fengyue Sun ,
Liang Li  and
Jiaming Yan
Haoran Li
Affiliation:
College of Earth Sciences, Jilin University, Changchun 130061, PR China
Fengyue Sun*
Affiliation:
College of Earth Sciences, Jilin University, Changchun 130061, PR China
Liang Li
Affiliation:
College of Earth Sciences, Jilin University, Changchun 130061, PR China
Jiaming Yan
Affiliation:
College of Earth Sciences, Jilin University, Changchun 130061, PR China
*
Author for correspondence: Fengyue Sun, Email: [email protected]
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Abstract

The Hudesheng mafic–ultramafic intrusions are located in the Oulongbuluke Block, north of the Qaidam Block in Qinghai Province, NW China. We carried out a detailed study of the intrusions, including field observations, petrology, zircon U–Pb geochronology, Lu–Hf isotopes, bulk-rock major- and trace-element geochemistry, and mineral compositions, to provide a better understanding of their properties and the regional tectonic evolution. Zircon U–Pb dating on gabbro and pyroxenite samples yielded ages of 465 and 455 Ma, respectively. Geochemical data, in conjunction with the field observations and petrological features, suggest that the complex is Alaskan-type and the magma was derived from a depleted mantle source that was hydrous picritic basalt in composition and influenced by crustal contamination and slab-derived fluid metasomatism. Based on all the chronological, petrological, mineralogical and geochemical and regional geological data, we conclude that the palaeo-ocean closed diachronously from west to east between the Qaidam and Oulongbuluke blocks, and that the ocean in the east of the North Qaidam region closed after ∼455 Ma.

Keywords

Alaskan-type intrusionarc magmatismmafic–ultramafic complexOulongbuluke BlockQaidam Block
Type
Original Article
Information
Geological Magazine , Volume 156 , Issue 9 , September 2019 , pp. 1527 - 1546
Copyright
© Cambridge University Press 2018 

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