Permian–Triassic amalgamation of Asia: Insights from Northeast China sutures and their place in the final collision of North China and Siberia

The Central Asia Orogenic Belt (CAOB) corresponds to the domain where Siberia and Mongolia were welded to North China. The eastern extension of the CAOB in Northeast China is disputed, since both suture location and timing are poorly documented. This paper reports for the first time the recognition...

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Published inComptes rendus. Geoscience Vol. 340; no. 2-3; pp. 190 - 201
Main Authors Lin, Wei, Faure, Michel, Nomade, Sébastien, Shang, Qinghua, Renne, Paul Randall
Format Journal Article
LanguageEnglish
Published 01.02.2008
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Summary:The Central Asia Orogenic Belt (CAOB) corresponds to the domain where Siberia and Mongolia were welded to North China. The eastern extension of the CAOB in Northeast China is disputed, since both suture location and timing are poorly documented. This paper reports for the first time the recognition of two suture zones in the southern part of Northeast China (Manchuria), between the Fushun Mishan and Yilan-Yitong faults. In the Jilin Province, west-directed thrust sheets involving successively, from west to east, passive continental margin rocks, metamorphic rocks and ophiolites, block-in-matrix formations and arc plutons indicate a Permian-Early Triassic collision. In the Liaoning Province, arc plutonism and top-to-the-north ductile shearing, coeval with the emplacement of an ophiolitic nappe, suggest a Palaeozoic collision. These two sutures are correlated with the Ondor Sum and Solonker sutures, described in Inner Mongolia. A new geodynamic model involving rifting and collision of the southern part of the Xilinhot Block with North China is proposed.Original Abstract: La ceinture plissee d'Asie centrale (CAOB) correspond au domaine dans lequel la Siberie et la Mongolie se sont soudees a la Chine du Nord. L'extension orientale de ce domaine est discutee, car la localisation des sutures et la chronologie sont mal connues. Dans la partie sud de la Chine du Nord-Est (Mandchourie meridionale), entre les failles de Fushun-Mishan et de Yilan-Yitong, deux sutures sont reconnues pour la premiere fois. Dans la province de Jilin, des chevauchements vers l'ouest impliquent successivement, d'ouest en est, des roches de marge continentale passive, des roches metamorphiques et des ophiolites, une serie a blocs et des plutons d'arcs. Cette architecture s'accorde avec une collision d'age Permien superieur a Trias inferieur. Dans la province de Liaoning, des plutons d'arc et une serie ophiolitique deformee ductilement par des cisaillements vers le nord suggerent une collision d'age Carbonifere. Ces deux sutures sont correlees avec celles d'Ondor Sum et de Solonker, en Mongolie interieure. Un modele geodynamique impliquant deux subductions oceaniques entre les blocs continentaux de Chine du Nord et de Xilinhot est propose pour rendre compte de la formation de la terminaison orientale de la CAOB.
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ISSN:1778-7025
1631-0713
1778-7025
DOI:10.1016/j.crte.2007.10.008