The Late Paleozoic tectonic evolution of Central Asian Orogenic Belt in Central-Eastern Inner Mongolia

Abstract : Central-eastern Inner Mongolia, located in the southeastern part of the Central Asian Orogenic Belt (CAOB), is a key area to study the collisional-accretionary history between the North China Craton (NCC) and the northern continental blocks. The establishment of precise constraints of this tectonic framework and evolutional history are importantto understand the accretion of CAOB. However, no any consensus has been achieved about the way and the timing of the accretion between NCC and the northern blocks. Therefore, multidisciplinary studies have been carried out on the Late Paleozoic strata and magmatic rocks in central-eastern Inner Mongolia. Based on our sedimentological analyses, detrital zircon geochronological constraints, geochemical studies and paleomagnetic investigations, integrating the previous results in petrology, geochemistry and paleontology, the Late Paleozoic sedimentary-tectonic evolution of the central-eastern Inner Mongolia has been established. Detailed sedimentological and geochemical studies show atransition from the Devonian molassic deposits to the Early Carboniferous denudation and from the Late Carboniferous inland-sea sediments to the Permian extensional basin deposits. According to the comprehensive analyses on sedimentary facies, geochemical characteristics and paleomagnetic data, we propose a Paleozoic subduction-collision- post-orogenic extension tectonic model for central-eastern Inner Mongolia.
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Pan Zhao. The Late Paleozoic tectonic evolution of Central Asian Orogenic Belt in Central-Eastern Inner Mongolia. Tectonics. Université d'Orléans; Université de Pékin - Chine, 2014. Chinese. ⟨tel-01102290⟩

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