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Gold Science and Technology ›› 2017, Vol. 25 ›› Issue (5): 30-38.doi: 10.11872/j.issn.1005-2518.2017.05.030

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Analysis on Geochemical Characteristics and Regional Tectonic Background of Mafic Rocks in Yangxu Area,Western Guangxi

CHEN Lifei 1,2,FU Wei 1,3,HUANG Xianglin 2,CHEN Hongyi 1,TONG Ruiling 2   

  1. 1.College of Earth Sciences,Guilin University of Technology,Guilin    541006,Guangxi,China;
    2.Institute of Regional Geological Survey of Guangxi,Guilin    541003,Guangxi,China;
    3.Guangxi Key Laboratory of Hidden Metallic Ore Deposits Exploration,Guilin    541006,Guangxi,China
  • Received:2017-07-19 Revised:2017-08-29 Online:2017-10-30 Published:2018-02-12

Abstract:

Western Guangxi is located in the southwestern margin of the South China Block and the northern side of North Vietnam Block.Mafic dikes which widely developed in this region is an important component of the tectonic and magmatism in Late Paleozoic of Yangtze block.Yangxu mafic rocks have similar geochemical properties with Emeishan basalt,it shows an enrichment of LILE,HFSE,and significant fractionation between LREE and HREE,that akin to ocean island basalts OIB.These suggestive of an affinity with the Emeishan high-Ti basalts and also reflects the source have characteristics of intraplate magmatism.The ratio of trace elements and related diagrams may indicate that Yangxu mafic rocks came from the enriched OIB mantle source region.Combined with the geochemical characteristics of rocks and regional geological background,it is considered that Yangxu mafic rocks may be the products of magmatism of the mantle plume of Emeishan.On the whole,it is related to the intraplate magmatic environment,and its genesis may be affected by the interaction between intraplate magma and island arcbasalt.

Key words: mafic rocks, geochemistry, mantle plume, high-Ti basalts, magmatism, Yangxu, western Guangxi Province

CLC Number: 

  • P596

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