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黄金科学技术 ›› 2017, Vol. 25 ›› Issue (5): 30-38.doi: 10.11872/j.issn.1005-2518.2017.05.030

• 矿产勘查与资源评价 • 上一篇    下一篇

桂西阳圩地区基性岩地球化学特征及区域构造背景分析

陈丽菲1,2,付伟 1,3*,黄祥林2,陈宏毅 1,同锐灵 2   

  1. 1.桂林理工大学地球科学学院,广西  桂林   541006;
    2.广西壮族自治区区域地质调查研究院,广西  桂林   541003
    3.广西隐伏金属矿产勘查重点实验室,广西  桂林   541006
  • 收稿日期:2017-07-19 修回日期:2017-08-29 出版日期:2017-10-30 发布日期:2018-02-12
  • 通讯作者: 付伟(1980-),男,山西太原人,教授,从事矿床学与地球化学方面的教学与研究工作。fuwei@glut.edu.cn
  • 作者简介:陈丽菲(1988-),女,山西长治人,硕士研究生,从事岩石学、矿物学和矿床学研究工作。769524528@qq.com
  • 基金资助:

    广西找矿突破战略行动地质矿产勘察项目“广西1∶5万者仙圩、大琶、剥隘、阳圩区域地质矿产调查”(编号:桂国土资函[2015]436号)和广西自然科学基金项目“广西离子吸附型稀土矿床的表生成矿系统研究”(编号:2014GXNSFAA118304)联合资助

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

摘要:

桂西地区位于华南板块西南缘,越北地块以北。区内广泛发育的基性岩脉是扬子地块西部晚古生代构造—岩浆作用的重要组成部分。阳圩一带发育的基性岩与峨眉山火成岩具有相似的地球化学性质,轻、重稀土分馏明显,富集大离子亲石元素(LILE)和高场强元素(HFSE),显示出似OIB地球化学特征,与峨眉山高Ti玄武岩具高度亲缘性,同时也反映其源区具有板内岩浆作用的特征;从微量元素比值及相关图解对岩浆源区和构造环境进行判别,结果表明阳圩基性岩来自富集OIB地幔源区,结合岩石地球化学特征及区域地质背景,认为阳圩基性岩可能为峨眉山地幔柱岩浆作用的产物,总体上与板内岩浆环境有关,其成因可能受到板内岩浆和岛弧玄武岩浆的共同作用。

关键词: 基性岩, 地球化学, 地幔柱, 高Ti玄武岩, 岩浆作用, 阳圩, 桂西地区

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

中图分类号: 

  • P596

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