坦桑尼亚莫罗戈罗地区班巴拉维石墨矿地球化学特征及成矿研究

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英文篇名：Geochemical characteristics and metallogenic study of the Bambarawe graphite deposit in Morogoro,Tanzania 作者：曹义甲 ; 祁东 ; 张冬霞 ; 柴丽洁 ; 焦杨 英文作者：CAO Yi-jia;QI Dong;ZHANG Dong-xia;CHAI Li-jie;JIAO Yang;No.2 Institute of Geological&Mineral Resources Survey of Henan;Institute of Surveying Mapping and Geoinformation of Henan; 关键词：晶质石墨矿 ; 地球化学特征 ; 原岩恢复 ; 矿床成因 ; 坦桑尼亚 英文关键词：crystalline graphite ore;;geochemical characteristics;;restoration of the original rock;;genesis of the deposit;;Tanzania 中文刊名：矿产勘查 英文刊名：Mineral Exploration 机构：河南省地质矿产勘查开发局第二地质矿产调查院;河南省地质矿产勘查开发局测绘地理信息院; 出版日期：2019-02-28 出版单位：矿产勘查 年：2019 期：02 基金：2016年度河南省财政地质勘查(国外)项目(编号:豫国土资发[2016]46号)资助 语种：中文; 页：181-191 页数：11 CN：11-5875/TD ISSN：1674-7801 分类号：P619.252

摘要

班巴拉维石墨矿主要赋存于元古宙乌萨迦兰超群鲁匡古勒组特戈特罗段的含石墨片麻岩中,含矿岩系为石墨黑云斜长片麻岩,中—粗粒鳞片状变晶结构,片麻状构造,矿石类型为大鳞片晶质石墨矿石。石墨矿石主量元素具有低硅、贫钙、富铝、富钾的特征;K_2O/Na_2O的平均值为6. 43,变质原岩表现出沉积岩的特征。LREE/HREE-∑REE呈正相关,表明其原岩可能为海相沉积;LREE/HREE-δEu呈正相关,反映了其壳源特征;并表现为弱的负Eu异常。根据地球化学原岩恢复图解投点,得出原岩可能为一套含碳质、富铝的泥质沉积建造,其物源为混合型物源,主要形成于被动大陆边缘。班巴拉维石墨矿的成矿物质来源主要为原岩中的有机碳,矿床成因属于区域变质矿床。
        The Bambarawe graphite deposit is hosted in the graphite bearing metamorphic rock series of the Usagaran Super Group Lukwangule Formation Tegetero Member. The ore bearing rock series is plagioclase gneiss containing graphite and biotite, the ore is medium to coarse scale flaky texture, gneiss structure, and ore type is large scale crystalline graphite ore. The main elements of the graphite ore are characterized by low silicon, poor calcium, aluminum rich and potassium rich. The average value of K_2 O/Na_2 O is6. 43, and the metamorphic protolith is characterized by sedimentary rocks. LREE/HREE-∑REE is positively correlated, indicating that its original rock may be marine sediments. LREE/HREE-δEu is positively correlated, reflecting its source characteristics and showing a weak negative Eu anomaly. According to the graphical input point of geochemical original rock recovery, it is concluded that the original rock may be a carbonaceous and aluminum rich argillaceous sedimentary formation. The provenance of metamorphic protolith is mixed source, mainly formed on the passive continental margin. The source of ore-forming material of the Bambarawe graphite deposit is mainly organic carbon in the original rock, and the genesis of the deposit belongs to the regional metamorphic deposit.

引文

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