老挝XK离子吸附型稀土矿床斑状二长花岗岩地球化学特征及地质意义
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摘要
老挝XK离子吸附型稀土矿床是近年新发现的稀土矿床,产于斑状二长花岗岩风化壳。采集斑状二长花岗岩新鲜岩石进行分析测试。研究表明:斑状二长花岗岩具有过铝质的特征,属钙碱性系列岩石,稀土元素配分模式为右倾斜轻稀土富集型,重稀土分馏程度低,且伴有铕亏损,源区物质主要源于地壳,与区域铜金铁多金属成矿作用相关的花岗质岩体成岩、构造环境相同,暗示晚石炭世—早二叠世发生了一次重要区域成矿作用。通过与广西龙山、小平山大型离子吸附型稀土母岩等成矿条件对比,指示该区具有良好找矿前景。
The Lao XK ion-adsorbed rare earth deposit is a newly discovered rare earth deposit in recent years,which is produced in the porphyritic monzonitic weathering crust.The fresh rocks of the porphyritic monzonite were collected for analysis and testing.The results of the study showed that the porphyritic monzonitic granite is characterized by over-aluminum and belongs to the calc-alkaline series,its chondrite-normalized REE pattern exhibits a right-dipping V-type curve in europium loss.The granitic magma mainly originate from the crustal material.The diagenetic environment of the granite which related to the regional copper,gold,and iron polymetallic mineralization is the same as the tectonic setting,suggesting that an important regional mineralization occurred in the Late Carboniferous-Early Permian.Compared with the oreforming conditions of large-scale ion-adsorbed rare earth parent rocks in Longshan and Xiaopingshan,Guangxi,it indicates that the area has good prospecting prospects.
The Lao XK ion-adsorbed rare earth deposit is a newly discovered rare earth deposit in recent years,which is produced in the porphyritic monzonitic weathering crust.The fresh rocks of the porphyritic monzonite were collected for analysis and testing.The results of the study showed that the porphyritic monzonitic granite is characterized by over-aluminum and belongs to the calc-alkaline series,its chondrite-normalized REE pattern exhibits a right-dipping V-type curve in europium loss.The granitic magma mainly originate from the crustal material.The diagenetic environment of the granite which related to the regional copper,gold,and iron polymetallic mineralization is the same as the tectonic setting,suggesting that an important regional mineralization occurred in the Late Carboniferous-Early Permian.Compared with the oreforming conditions of large-scale ion-adsorbed rare earth parent rocks in Longshan and Xiaopingshan,Guangxi,it indicates that the area has good prospecting prospects.
引文
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[4]林方成,施美凤,李佑国,等.老挝-越南长山成矿带成矿规律与勘查靶区优选研究项目成果报告[R].2015.
[5]赵红娟,陈永清,卢映祥.老挝长山成矿带与花岗岩有关的铜金铁矿床的成矿模式[J].地质通报,2011,30(10):1619-1627.
[6]TATE N M.Geology and mineralisation of the Phu Kham copper-gold deposit Lao People’s Democratic Republic[M].Berlin,Heidelberg:Springer Berlin Heidelberg,2005:1077-1080.
[7]何文举.老挝中-东部大型铁铜金矿矿集区矿床地质:对云南“三江”地区找金的启示[J].云南地质,2004,23(2):164-178.
[8]CROMIE P W.Geological setting,geochemistry and genesis of the Sepon gold and copperdeposits,Laos.[D].Hobart:University of Tasmania(UTAS),2010.[2019-03-15].http://www.docin.com/p-1485728659.html.
[9]王疆丽,林方成,朱华平,等.老挝万象省爬立山铁矿成矿二长花岗岩锆石SHRIMP U-Pb定年及其地质意义[J].沉积与特提斯地质,2013,33(3):87-93.
[10]周雄,温春齐,费光春,等.西藏邦铺斑岩型钼矿床斑状二长花岗斑岩地球化学特征及构造意义[J].矿物岩石,2010,30(4)48-54.
[11]LEPVRIER C,VUONG N V,MALUSKI H,et al.Indosinian tectonics in Vietnam[J].Comptes Rendus Geoscience,2008,340(2/3):94-111.
[12]LAN C Y,CHUNG S L,SHEN J S,et al.Geochemical and SrNb isotopic characteristics of granitic rocks from northern Vietnam[J].Journal of Asian Earth Sciences,2000,18(3):267-280.
[13]卢见昆,廖航,黄长帅,等.广西新联稀土矿区莲塘花岗岩的地质地球化学特征及成矿意义[J].矿产与地质,2014,28(5):605-610,647.
[14]陆一敢,方科,卢见昆,等.广西龙江矿区离子吸附型稀土矿成矿规律对比[J].桂林理工大学学报,2015,35(4):660-666.
[15]梁发辉,党飞鹏,邓军,等.江西龙源坝地区花岗岩风化壳离子吸附型稀土矿成矿条件与分布特征[J].矿产与地质,2014,28(4):461-465,486.