Devonian to carboniferous tectonic evolution of the Kangguer Ocean in the Eastern Tianshan, NW China: Insights from three episodes of granitoids

Deciphering the tectonic evolution of the Kangguer Ocean is critical to understand the architecture of the Eastern Tianshan, NW China. Previous studies for the Kangguer Ocean mainly concentrated on final closure during the Latest Carboniferous to Permian. Three distinct episodes of granitoids have b...

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Bibliographic Details
Published in:Lithos 2019-12, Vol.350-351, p.105243, Article 105243
Main Authors: Du, Long, Zhang, Yunying, Huang, Zongying, Li, Xu-Ping, Yuan, Chao, Wu, Bin, Long, Xiaoping
Format: Article
Language:English
Subjects:
Adakite
Eastern Tianshan
Granite
Kangguer ocean
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Summary:Deciphering the tectonic evolution of the Kangguer Ocean is critical to understand the architecture of the Eastern Tianshan, NW China. Previous studies for the Kangguer Ocean mainly concentrated on final closure during the Latest Carboniferous to Permian. Three distinct episodes of granitoids have been recognized in the Kangguer belt: Late Devonian (ca. 360 Ma) normal I-type granites, Early Carboniferous (ca. 348 Ma) fractionated I-type granites, and Late Carboniferous (ca. 317–302 Ma) adakitic granites, attempting to provide constraints on the sources of these rocks, which further unravels the evolution of the Kangguer Ocean during this period. The Late Devonian granites exhibit calc-alkaline characteristics, with negligible Eu anomalies and low (K2O + Na2O)/CaO ratios, akin to I-type granites without significant fractional crystallization. They display high SiO2 (>70 wt.%), with low MgO (
ISSN:0024-4937
1872-6143
DOI:10.1016/j.lithos.2019.105243