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<title lang=en>Polyorogenic evolution of the Paleoproterozoic Trans-North China Belt, new insights from the in Lüliangshan-Hengshan-Wutaishan and Fuping massifs</title>
<creator>Faure, Michel</creator>
<creator>Trap, Pierre</creator>
<creator>Lin, Wei</creator>
<creator>Monié, Patrick</creator>
<creator>Bruguier, Olivier</creator>
<contributor>Institut des Sciences de la Terre d'Orléans (ISTO) ; Institut national des sciences de l'Univers (INSU - CNRS) - Université d'Orléans (UO) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>State Key Laboratory of Lithospheric Evolution ; Institute of Geology and Geophysics, Chinese Academy of Sciences</contributor>
<contributor>Géosciences Montpellier ; Université des Antilles et de la Guyane (UAG) - Institut national des sciences de l'Univers (INSU - CNRS) - Université de Montpellier (UM) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>NSF of China grant n° 40472116 and A scholarship from the Conseil Régional du Centre for Pierre Trap</contributor>
<description>http://www.episodes.org/backissues/302/abstract2.htm</description>
<description>International audience</description>
<source>ISSN: 0705-3797</source>
<source>Episodes Journal of International Geoscience</source>
<publisher>Seoul National University</publisher>
<identifier>insu-00152972</identifier>
<identifier>https://hal-insu.archives-ouvertes.fr/insu-00152972</identifier>
<identifier>https://hal-insu.archives-ouvertes.fr/insu-00152972/document</identifier>
<identifier>https://hal-insu.archives-ouvertes.fr/insu-00152972/file/Episodes_TNCB_Faure_et_al.pdf</identifier>
<source>https://hal-insu.archives-ouvertes.fr/insu-00152972</source>
<source>Episodes Journal of International Geoscience, Seoul National University, 2007, 30 (2), pp.95-106</source>
<language>en</language>
<subject lang=en>Archean-Paleoproterozoic transition</subject>
<subject lang=en>Paleoproterozoic geodynamics</subject>
<subject lang=en>Ophiolites</subject>
<subject lang=en>Continental collision</subject>
<subject lang=en>Arc magmatism</subject>
<subject lang=en>Crustal melting</subject>
<subject lang=en>North China Craton</subject>
<subject>[SDU.STU.TE] Sciences of the Universe [physics]/Earth Sciences/Tectonics</subject>
<subject>[SDE.MCG] Environmental Sciences/Global Changes</subject>
<type>info:eu-repo/semantics/article</type>
<type>Journal articles</type>
<description lang=en>The Trans-North China Belt (TNCB) is a Paleoproterozoic collisional orogen (ca. 1.9-1.8 Ga) responsible for the amalgamation of the North China Craton. Detail field works in Lüliangshan, Hengshan, Wutaishan and Fuping massifs where the belt is well exposed, allow us to draw new tectonic map and crustal-scale cross sections. The available petrologic, radiometric, geochronologic data are integrated in a geodynamic evolution scheme for this orogen. The Low Grade Mafic Unit (LGMU) is interpreted as an ophiolitic nappe rooted in a suture zone located in the western part of the Lüliangshan. This ophiolitic nappe overthrusts to the SE upon the Orthogneiss-Volcanites Unit (OVU) that consists of a bimodal volcanicsedimentary series metamorphosed under amphibolite facies conditions intruded by calcalkaline orthogneiss. The OVU is a composite Neoarchean-Paleoproterozoic magmatic arc developed during two stages (ca. 2500 and 2100 Ma) upon a continental basement corresponding to the western extension of the Neoarchean Fuping massif. The OVU overthrusts to the SE the Fuping massif along the Longquanguan shear zone. This stack of nappe, coeval with an amphibolite facies metamorphism, is dated at ca 1880 Ma. Subsequently, the metamorphic series experienced a widespread migmatization at 1850 Ma and was intruded by post-orogenic plutons dated at 1800 Ma. The weakly to unmetamorphosed Hutuo Supergroup unconformably overlies the metamorphosed and ductilely deformed units (OVU and LGMU), but it is also involved in a second tectonic phase developed in subsurface conditions. These structural features lead us to question the ca 2090 Ma age attributed to the Hutuo supergroup. Moreover, in the Fuping massif, several structural and magmatic lines of evidence argue for an earlier orogenic event at ca 2100 Ma that we relate to an older west-directed subduction below the Fuping Block. The Taihangshan Fault might be the location of a possible suture zone between the Fuping Block and an eastern one. A geodynamic model, at variance with previous ones, is proposed to account for the formation of the TNCB. In this scheme, three Archean continents, namely from West to East, the Ordos, Fuping and Eastern Blocks are separated by the Lüliang and Taihang Oceans. The closure of the Taihang Ocean at ca 2100 Ma by westward subduction below the Fuping Block accounts for the arc magmatism and the 2100 Ma orogeny. The second collision at 1900-1880 Ma between the Fuping and Ordos blocks is responsible for the main structural, metamorphic and magmatic features of the Trans-North China Belt.</description>
<date>2007</date>
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