Geochemical characteristics and tectonic setting of the Tuerkubantao mafic-ultramafic intrusion in West Junggar,Xinjiang,China

查看全文 作　　者：Yufeng [1]Deng;Feng [1]Yuan;Taofa [1]Zhou;Chao [1]Xu;Dayu [1]Zhang;Xuji [2]Guo

机构地区：[1]School of Resources and Environmental Engineering, Hefei University of Technology;[2]No.706 Geological Party, Xinjiang Geoexploration Bureau for Nonferrous Metals

出　　处：《Geoscience Frontiers》索引2015年第6卷第2期,共12页

基　　金：financially supported by the Chinese National Science and Technology Program during the 12th Five-year Plan Period(2011BAB06B01);the Program for New Century Excellent Talents in University(Grant No.NCET-10-0324);NSFC research grants(41303031,41172090,41040025);the Fundamental Research Funds for the Central Universities(2013bhzx0015);Open Funds from the State Key Laboratory of Ore Deposit Geochemistry,Institute of Geochemistry,Chinese Academy of Sciences(201102) 摘　　要：Mineral chemistry,whole-rock major oxide,and trace element compositions have been determined for the Tuerkubantao mafic-ultramafic intrusion,in order to understand the early Paleozoic tectonic evolution of the West Junggar orogenic belt at the southern margin of the Central Asian orogenic belt.The Tuerkubantao mafic-ultramafic intrusion is a well-differentiated complex comprising peridotite,olivine pyroxenite,gabbro,and diorite.The ultramafic rocks are mostly seen in the central part of the intrusion and surrounded by mafic rocks.The Tuerkubantao intrusive rocks are characterized by enrichment of large ion lithophile elements and depleted high field strength elements relative to N-MORB.In addition,the Tuerkubantao intrusion displays relatively low Th/U and Nb/U(1.13—2.98 and 2.53—7.02,respectively) and high La/Nb and Ba/Nb(1.15—4.19 and 37.7—79.82,respectively).These features indicate that the primary magma of the intrusion was derived from partial melting of a previously metasomatized mantle source in a subduction setting.The trace element patterns of peridotites,gabbros,and diorite in the Tuerkubantao intrusion have sub-parallel trends,suggesting that the different rock types are related to each other by differentiation of the same primary magma.The intrusive contact between peridotite and gabbro clearly suggest that the Tuerkubantao is not a fragment of an ophiolite.However,the Tuerkubantao intrusion displays many similarities with Alaskan-type mafic-ultramafic intrusions along major sutures of Phanerozoic orogenic belts.Common features include their geodynamic setting,internal lithological zoning,and geochemistry.The striking similarities indicate that the middle Devonian Tuerkubantao intrusion likely formed in a subduction-related setting similar to that of the Alaskan-type intrusions.In combination with the Devonian magmatism and porphyry mineralization,we propose that subduction of the oceanic slab has widely existed in the expansive oceans during the Devonian around the Junggar block. 关键词：超镁铁质岩石地球化学特征西准噶尔侵入岩构造背景中亚造山带超基性岩体地球动力学背景

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Geochemical characteristics and tectonic setting of the Tuerkubantao mafic-ultramafic intrusion in West Junggar,Xinjiang,China

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