滇东南丘北县大铁铝土矿床微量元素特征与成矿环境研究
Research on Trace element geochemical characteristics and ore-forming environment of the Datie bauxite deposit in Qiubei county, southeast of Yunnan province
投稿时间:2014-08-08  修订日期:2014-08-08
DOI:
中文关键词:  丘北  大铁 铝土矿  微量元素 成矿环境
英文关键词:Qiubei, Datie, Bauxite  deposit, Trace  element, ore-forming  environment
基金项目:云南省铝土矿成矿规律与成矿预测研究项目(云南有色地质局,编号:20100610-02)
作者单位邮编
王行军 中国地质大学北京地球科学与资源学院 100083
王根厚 中国地质大学北京地球科学与资源学院 
周洁 中国地质大学北京地球科学与资源学院 
桑学镇 中国地质大学北京地球科学与资源学院 
崔银亮 云南省有色地质局 
张道红 云南省有色地质局 
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中文摘要:
      大铁铝土矿床近年来在滇东南地区新发现的一个大型铝土矿床,普遍伴生Fe、Ti、Ga,为低铝高铁高钛铝土矿床。本文以大铁铝土矿含铝岩系为研究对象,通过ICP-MS分析测试,研究了含铝岩系微量元素的特征及成矿作用。大铁铝土矿含铝岩系Be(2.66CcCc10-6)含量较低、Th/U(4.83)比值中等、Ti(33702CcCc10-6)含量高、LREE/HREE(10.52)中等、δCe(1.55)高,说明其成矿物质来源于风化壳,后又经历了沉积作用的改造;Ga(29.63CcCc10-6)含量高、Sr/Ba(11.51)比值高、Sr(70CcCc10-6)含量低、Ba(518CcCc10-6)含量高、V/Zr(0.97)比值较高、Li(163CcCc10-6)含量高,总体上显示出海相沉积特征,部分样品显示出陆相沉积的沉积特征,这也预示着其成矿物来源于风化壳,局部沉积作用改造不明显,亦显示出近源沉积的特征。上述研究结果表明,大铁铝土矿床含铝岩系成矿物质来源于风化壳,残积作用明显,沉积作用起到对铝土矿改造和再沉积作用;大铁铝土矿床形成于海相环境,海水对成矿物质的改造不充分,部分微量元素显示出陆相沉积的特征。
英文摘要:
      ion: Datie bauxite deposit is a large bauxite deposit that newly discovered in the southeast Yunnan in recent years. The deposit is generally associated with Fe, Ti and Ga, and it is low Al, high Fe, and high Ti bauxite bed. In this paper, we put aluminum-containing rock series of Datie bauxite deposit in Qiubei county as study object. We study the trace element geochemical characteristics and the ore-forming environment of the aluminum-containing rock series of Datie bauxite deposit by ICP-MS analysis and testing. Aluminum-containing rock series of Datie bauxite are characterized by low levels of Be (2.66CcCc10-6) , ratio medium of Th/U (4.83) , high content of Ti (33702CcCc10-6) , medium level of LREE/HREE (10.52), high content of δCe (1.55), which indicate that the mineral derived from the weathering crust, and then experienced a deposition transformation. Aluminum-containing rock series of Datie bauxite are high content of Ga (29.63CcCc10-6), high ratio of Sr / Ba (11.51), low content of Sr (70CcCc10-6) , high content of Ba (518CcCc10-6), higher ratio of V/Zr (0.97) , and high Li (163CcCc10-6) , show the sea facies features in general, and some samples show characteristics of terrestrial sedimentary deposition, which also indicates that the mineral comes from weathering crust and the local deposition transformation is not obvious, also show near-source deposition characteristics. There results indicate that ore-forming material of aluminum-containing rock series of Datie bauxite deposit come form the weathering crust, eluviations was obvious, and sedimentation played right into the effect that reworked and redepositd bauxites; Tatie bauxite deposit formed in marine environment, it was inadequate that seawater reworked the ore-forming material.
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