The geochemical characteristics, geochronology and tectonic significance of the Carboniferous volcanic rocks of the Santanghu area in northeastern Xinjiang, China

The Santanghu area is located on the northeastern margin of the Junggar Basin, northern Xinjiang, Northwest China. The Car- boniferous volcanic rocks in this area are widely distributed in Kaokesaiergaishan, Santanghu, Daheishan and Naomaohu dis- tricts, which are located to the north of the Kalamei...

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Bibliographic Details
Published in:Science China. Earth sciences 2013-08, Vol.56 (8), p.1318-1333
Main Authors: Li, Wei, Liu, YiQun, Dong, YunPeng, Zhou, XiaoHu, Liu, XiaoMing, Li, Hong, Fan, TingTing, Zhou, DingWu, Xu, XueYi, Chen, JunLu
Format: Article
Language:English
Subjects:
Carboniferous
Crystallization
Earth and Environmental Science
Earth Sciences
Geochemistry
Island arcs
Isotopes
Magma
Plate tectonics
Research Paper
Volcanic rocks
Volcanoes
三塘湖
东北部
同位素年代学
地球化学特征
基性火山岩
新疆北部
构造意义
石炭纪
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Summary:The Santanghu area is located on the northeastern margin of the Junggar Basin, northern Xinjiang, Northwest China. The Car- boniferous volcanic rocks in this area are widely distributed in Kaokesaiergaishan, Santanghu, Daheishan and Naomaohu dis- tricts, which are located to the north of the Kalameili Fault. These rocks, sourced from a cognate magma, consist of basic, in- termediate, and acidic lavas, and pyroclastic rock. The basic volcanic rocks are enriched with large-ion lithophile elements （LILE）, but are relatively depleted in high field strength elements （HFSE）, and have an obvious negative Nb-Ta-Ti anomaly. They were most probably derived from a depleted mantle source, and during their ascent, these magmas were not contaminated by the crustal material as they underwent magma crystallization differentiation. Based on the Carboniferous volcanic assem- blage and geochemical data, it is apparent that the early Carboniferous volcanism occurred in a subduction-related tectonic set- ting. New LA-ICP-MS zircon U-Pb analyses constrain the age of the andesite within the volcanic rocks as the early Carbonif- erous （328.9-331.3 Ma）. Combined with the regional geological record, comprehensive analysis of the isotope geochronological data indicates that the subduction of the Junggar Ocean predates the early Carboniferous, and that the Santanghu island arc magmatism was induced by the subduction of the Junggar Ocean in the Carboniferous.
ISSN:1674-7313
1869-1897
DOI:10.1007/s11430-012-4483-3