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滇东南广南县砂子塘铝土矿床地球化学特征研究
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  • 英文篇名:Geochemical Characteristics of the Shazitang Bauxite Deposit in Guangnan County,Southeast Yunnan
  • 作者:王行军 ; 王梓桐 ; 王根厚 ; 周洁 ; 崔银亮 ; 张道红 ; 李伟清 ; 范良军
  • 英文作者:WANG Xingjun;WANG Zitong;WANG Genhou;ZHOU Jie;CUI Yinliang;ZHANG Daohong;LI Weiqing;FAN Liangjun;China Coal Geology Group Co,LTD.;School of Earth Sciences and Resources,China University of Geosciences;Nonferrous Geological Bureau of Yunnan Province;Kunming Survey and Design Insitute Co.Ltd.,Southwest Non-ferrous Metal Geology Exploration Bureau;
  • 关键词:砂子塘 ; 铝土矿 ; 地球化学 ; 成矿物质 ; 成矿环境
  • 英文关键词:Shazitang;;bauxite deposit;;geochemical characteristics;;ore-forming materials;;mineralization environment
  • 中文刊名:XBDI
  • 英文刊名:Northwestern Geology
  • 机构:中煤地质集团有限公司;中国地质大学(北京)地球科学与资源学院;云南省有色地质局;西南有色昆明勘测设计(院)股份有限公司;
  • 出版日期:2018-12-05
  • 出版单位:西北地质
  • 年:2018
  • 期:v.51;No.210
  • 基金:云南有色地质局基金项目“云南省铝土矿成矿规律与成矿预测研究”(20100610-02),云南有色地质局基金项目“滇东南主要铝土矿矿床构造地质和成矿作用研究”(20100610-03)联合资助
  • 语种:中文;
  • 页:XBDI201804018
  • 页数:18
  • CN:04
  • ISSN:61-1149/P
  • 分类号:170-187
摘要
砂子塘铝土矿床以Al_2O_3含量高、A/S值高为特征,是滇东南地区少有高品质铝土矿床。笔者以砂子塘铝土矿床沉积型铝土矿为研究对象,研究了该矿床沉积型铝土矿的地球化学特征,进而对其成矿物质来源、成矿环境进行了讨论。含铝岩系的稀土总量总体较高,具中等程度的Eu负异常,具Ce正异常和Ce负异常;稀土配分曲线均为向右倾斜的弱"V"字型曲线,斜率不等,反映稀土元素分馏程度不等。含铝岩系明显富集大离子亲石元素U、高场强元素Nb、Ta、Zr、Hf、Th和亲铁元素Cr,其余元素则明显亏损。含铝岩系之中伴生有黑色金属Ti、稀土元素、分散元素Ga、稀有金属Nb和Li,可以与Al_2O_3一起综合利用。聚类分析显示,Al_2O_3与Nb、TiO_2、REE呈正相关,而与Ga、Fe_2O_3、Li呈负相关。含铝岩系灰岩标准化曲线为近水平的"U"字型曲线,含铝岩系的钛率(16.89)与下伏威宁组灰岩的钛率(13.09)接近,说明含铝岩系与下伏的威宁组灰岩关系密切。含铝岩系的Be含量低(3.60×10~(-6)),Th/U较高(6.07),多具Ce负异常,说明砂子塘铝土矿床来源于风化壳,后又经历了沉积作用的改造;Ga含量高(25.25×10~(-6)),Sr含量低(77.7×10~(-6)),Ba含量低(34.4×10~(-6)),V/Zr值较低(0.22),Eu/Sm值较低(0.21),显示出陆相沉积的特征;Sr/Ba值高(3.28),显示出海相沉积的特征。这预示着砂子塘铝土矿床的成矿物质来源于古风化壳,沉积作用改造不明显。
        Shazitang bauxite deposit is a rare high-quality bauxite deposit in Southeast Yunnan,which is characterized by high Al_2O_3 content and A/S ratio.In this paper,the sedimentary bauxite has been taken as the research object to study its geochemical characteristics,and then its oreforming materials sources and metallogenetic environment have been discussed.Aluminum-containing rock series has higher REE contents,showing moderate negative Eu anomaly,positive Ce anomalies and negative Ce anomalies;REE distribution patterns are tilted to the right curve with weak"V"-shaped and various slope,reflecting the varying degree of REE fractionation.LILE(U),HFSE(Nb,Ta,Zr,Hf,Th)and siderophile element(Cr)are significantly enriched in aluminum-containing rock series,the other elements are significantly loss.Cluster analysis shows that Al_2O_3 is positively correlated with Nb,TiO_2 and REE,but it has significantly negative correlation with Ga,Fe_2O_3 and Li.Aluminum-containing rock series is associated with black metal(Ti),rare earth elements,dispersed elements(Ga),rare metals(Nb and Li),and it can be comprehensively utilizated with Al_2O_3.REE distribution pattern for normalized aluminum-containing rock series are nearly horizontal"U"-shaped curve,the TiO_2/Al_2O_3 ratio of aluminum-containing rock series(16.89)is close with the TiO_2/Al_2O_3 ratio of limestone in Weining Formation(13.09),illustrating the close relationship between aluminiferous rock series and underlying limestone in Weining Formation.Among aluminum-containing rock series,Be content is low(3.60× 10~(-6)),Th/U ratio is high(6.07),and more samples have negative Ce anomalies.These geochemical characteristics indicate that the Shazitang bauxite deposit was sourced from weathering crust and experienced the sedimentation transformation.Ga content is high(25.25×10~(-6)),Sr content is low(77.7×10~(-6)),Ba content is low(34.4×10~(-6)),and V/Zr ratio(0.22)is lower,Eu/Sm ratio is lower(0.21),which shows the continental sedimentary characteristics;Sr/Ba ratio is high(3.28),which indicates the sea facies characteristics;these characteristics indicate that the Shazitang bauxite deposit was derived from the weathering crust,without obvious sedimentation transformation.
引文
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