Modern-style Subduction Processes in the Archean: Evidence from the Shangyi Complex in North China Craton

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Modern-style Subduction Processes in the Archean: Evidence from the Shangyi Complex in North China Craton
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                        WANG RenminWANG Renmin
The School of Earth and Space Sciences, Peking University, Beijing 100871, China
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WAN YushengWAN Yusheng
Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China
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CHENG SuhuaCHENG Suhua
School of the Earth Science and Resources, China University of Geosciences, Beijing 100083, China
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FENG YonggangFENG Yonggang
The School of Earth and Space Sciences, Peking University, Beijing 100871, China
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基金项目:This paper is supported by the State Key Laboratory of Geological Processes and Mineral Resources, China (No. GPMR0741), Research Fund for the Doctoral Program of Higher Education of China (20070491516) and NSFC(No. 40472096 and 90814006), which is dedicated to the 100 anniversary of geological department, Peking university.

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This paper is supported by the State Key Laboratory of Geological Processes and Mineral Resources, China (No. GPMR0741), Research Fund for the Doctoral Program of Higher Education of China (20070491516) and NSFC(No. 40472096 and 90814006), which is dedicated to the 100 anniversary of geological department, Peking university.

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Abstract: Three fragments of the Archean oceanic crust have been found between the Archean granulite belt and the Paleo-Proterozoic Hongqiyingzi group in North China craton, which spread along the Shangyi-Chicheng ancient fault. This paper presents integrated field, petrology, geochemistry and geochronology evidence of the ancient oceanic fragments. The magma crystallizing age of the tonalite in the Shangyi complex is 2512±19?Ma and the geochemical characteristics suggest that the Nb-enriched basalts may be related to crustal contamination and formed in the intra-oceanic arc of the supra subduction zone setting.

关键词:low-Al2O3 tonalite, Nb-enriched basalts, intra-oceanic arc, Archean ancient oceanic crust, North China craton

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Key words:low-Al2O3 tonalite, Nb-enriched basalts, intra-oceanic arc, Archean ancient oceanic crust, North China craton

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WANG Renmin, WAN Yusheng, CHENG Suhua, FENG Yonggang.2009. Modern-style Subduction Processes in the Archean: Evidence from the Shangyi Complex in North China Craton[J]. ACTA GEOLOGICA SINICA(English edition),83(3):535~543

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收稿日期:2009-02-02
最后修改日期:2009-02-27
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