张亚男;张莹华;吴慧;丁晓英;凌文黎;雷志远;翁申富;马倩;杜远生;

• 1:中国地质大学地质过程与矿产资源国家重点实验室
• 2:中国地质大学地球科学学院
• 3:贵州省地质矿产勘查开发局106地质大队

摘要(Abstract)：

铝土矿矿床中普遍含有不同比例的鲕状矿石,但目前对这些鲕粒的成因及其与成矿作用相互关系的了解相对有限。对贵州务正道地区铝土矿矿床中典型鲕状矿石中鲕粒进行了微区原位主量元素电子探针分析(EPMA)和激光剥蚀等离子体质谱(LA-ICP-MS)主量和微量元素分析,并与共存基质的元素组成进行了对比。研究表明,鲕粒的形成时间晚于基质,地表化学风化作用本身并不能导致铝土矿的形成;鲕粒的形成发生于强氧化和高酸度的环境,其成因被解释为在海进过程中在地层中一定的深度条件下形成了以黄铁矿为主的硫化物矿物,随后的海退作用过程导致硫化物蚀变并形成强酸环境,使得成矿元素Al相对于杂质元素(Si、Fe)发生相对富集,且该过程具有多期次振荡重复的特点。铝土矿形成是热带湿热气候条件下周期性海进-海退循环与长期的大陆古隆起区平坦海岸地形相互耦合的结果。

关键词(KeyWords)： 黔北;铝土矿;鲕粒;微区原位分析;地球化学特征;成矿意义

Abstract:

Keywords:

基金项目(Foundation): 贵州省地勘基金项目“贵州务正道地区铝土矿基础地质与成矿规律研究”

作者(Author): 张亚男;张莹华;吴慧;丁晓英;凌文黎;雷志远;翁申富;马倩;杜远生;

Email:

参考文献(References)：

• [1]Bárdossy G.Karst bauxites:Bauxite deposits on carbonaterocks[M].Amsterdam:Elsevier,1982.
• [2]Bárdossy G,Combes P J.Karst bauxites:Interfingering of deposi-tion and palaeoweathering[J].Special Publication of the Interna-tional Association of Sedimentologists,1999,27:189-206.
• [3]Bhattacharyya D P,Kakimoto P K.Origin of ferriferous oo-ids:An SEM study of ironstone ooids and bauxite pisoids[J].Journal of Sedimentary Research,1982,52(3):849-857.
• [4]Tardy Y,Nahon D.Geochemistry of laterites,stability of Al-goethite,Al-hematite,and Fe3+-kaolinite in bauxites and fer-ricretes:An approach to the mechanism of concretion forma-tion[J].American Journal of Science,1985,285:865-903.
• [5]Tardy Y.Petrology of laterites and tropical soils[M].Rotter-dam:Balkema,1997.
• [6]Delvigne J E.Atlas of micromorphology of mineral alterationand weathering[M].Ottawa:Canadian Mineralogist SpecialPublication,1998.
• [7]Mongelli G,Acquafredda P.Ferruginous concretions in a LateCretaceous karst bauxite:Composition and conditions of for-mation[J].Chemical Geology,1999,158(3/4):315-320.
• [8]Mongelli G.Growth of hematite and boehmite in concretionsfrom ancient karst bauxite:Clue for past climate[J].Catena,2002,50(1):43-51.
• [9]刘平.黔中-川南石炭纪铝土矿的地球化学特征[J].中国区域地质,1999,18(2):210-217.
• [10]刘平.三论贵州之铝土矿-贵州北部铝土矿成矿时代、物质来源及成矿模式[J].贵州地质,1993,10(2):105-113.
• [11]刘平.论黔北-川南石炭系大竹园组[J].中国区域地质,1996,15(2):123-130.
• [12]刘平.黔北务-正-道地区铝土矿地质概要[J].地质与勘探,2007,43(5):29-33.
• [13]黄兴,张雄华,杜远生,等.论黔北地区铝土矿形成的地质时代[J].地质科技情报,2012,31(3):49-54.
• [14]武国辉,金中国,鲍淼,等.黔北务正道铝土矿成矿规律探讨[J].地质与勘探,2008,44(6):31-35.
• [15]殷科华.黔北务正道铝土矿的成矿作用及成矿模式[J].沉积学报,2009,27(3):452-457.
• [16]刘平.五论贵州之铝土矿黔中-川南成矿带铝土矿含矿岩系[J].贵州地质,1995,12(3):185-203.
• [17]翁申富,廖友常.贵州省正安县红光坝铝土矿详查地质报告[R].遵义:贵州省地质矿产开发局106地质大队,2008.
• [18]雷志远,翁申富,廖友常,等.贵州省川县大竹园铝土矿区勘探地质报告[R].遵义:贵州省地质矿产开发局106地质大队,2010.
• [19]Liu Y S,Hu Z C,Gao S,et al.In situ analysis of major andtrace elements of anhydrous minerals by LA-ICP-MS withoutapplying an internal standard[J].Chemical Geology,2008,257(1/2):34-43.
• [20]Taylor S R,McLennan S M.The continental crust:Its com-position and evolution[M].Oxford:Blackwell Scientific Publi-cations,1985.
• [21]Gromet L P,Haskin L A,Korotev R L,et al.The“North A-merican shale composite”:Its compilation,major and trace el-ement characteristics[J].Geochimica et Cosmochimica Acta,1984,48(12):2469-2482.
• [22]Meyer F M,Happel U,Hausberg J,et al.The geometry andanatomy of the Los Pijiguaos bauxite deposit,Venezuela[J].Ore Geology Reviews,2002,20(1/2):27-54.
• [23]余文超,杜远生,顾松竹,等.黔北务正道地区早二叠世铝土矿多期淋滤作用及其控矿意义[J].地质科技情报,2013,32(1):27-32.
• [24]ztürk H,Hein J R,Hanili N.Genesis of the Doankuzuand Morta?Bauxite Deposits,Taurides,Turkey:Separationof Al,Fe,and Mn and implications for passive margin metal-logeny[J].Economic Geology,2002,97(5):1063-1077.
• [25]Moses C O,Nordstrom D K,Herman J S,et al.Aqueous py-rite oxidation by dissolved oxygen and by ferric iron[J].Geochimica et Cosmochimica Acta,1987,51(6):1561-1571.