Early Paleozoic magmatic history of central Inner Mongolia, China: implications for the tectonic evolution of the Southeast Central Asian Orogenic Belt

To provide insights into the Early Paleozoic tectonic evolution of the southern portion of the long-lived Central Asian Orogenic Belt, we have conducted major and trace element analyses and zircon U–Pb dating of granitoid samples from central Inner Mongolia. Our study area covers three pre-Mesozoic...

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Bibliographic Details
Published in:International journal of earth sciences : Geologische Rundschau 2016-07, Vol.105 (5), p.1307-1327
Main Authors: Wu, Chen, Liu, Changfeng, Zhu, Yan, Zhou, Zhiguang, Jiang, Tian, Liu, Wencan, Li, Hongying, Wu, Chu, Ye, Baoying
Format: Article
Language:English
Subjects:
Cambrian
Continental dynamics
Earth and Environmental Science
Earth Sciences
Geochemistry
Geological time
Geology
Geophysics/Geodesy
Island arcs
Magma
Marine
Mesozoic
Mineral Resources
Oceanic crust
Original Paper
Paleozoic
Plate tectonics
Sedimentology
Silurian
Structural Geology
Trace elements
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Summary:To provide insights into the Early Paleozoic tectonic evolution of the southern portion of the long-lived Central Asian Orogenic Belt, we have conducted major and trace element analyses and zircon U–Pb dating of granitoid samples from central Inner Mongolia. Our study area covers three pre-Mesozoic tectonic units from north to south: the Wenduermiao subduction–accretionary complex, the Bainaimiao magmatic belt, and the northern margin of the North China craton. Our new geochronological and geochemical data show the temporal and genetic relationships between the three tectonic units. Accordingly, we suggest that the Wenduermiao subduction–accretionary complex developed in the Middle Cambrian–Late Silurian (509–421 Ma), comprising of coeval oceanic crust, arc magmatism, and forearc deposits. The Bainaimiao continental arc was developed during the Late Cambrian to Early Silurian (501–437 Ma), which superposed on the basement with the affinity of the North China craton. The back-arc basin opened prior to Early Silurian and lasted to the Late Silurian, which is slightly younger than Bainaimiao island arc. The Wenduermiao Ocean, between the Wenduermiao subduction–accretionary complex and the Bainaimiao continental arc, existed in Early Paleozoic.
ISSN:1437-3254
1437-3262
DOI:10.1007/s00531-015-1250-7