广西东平地区碳酸锰矿床Ga含量高异常的发现及成因初探

发布时间：2018-04-17 11:58

本文选题：地球化学 + 北泗组　；参考：《矿床地质》2017年03期

【摘要】：Ga是一种典型的稀有分散元素,主要产于铝土矿、闪锌矿及煤矿之中。最近,在广西东平地区下三叠统北泗组碳酸锰矿床中发现Ga高异常含量,w(Ga)介于5.16×10~(-6)~82.80×10~(-6)之间,平均为33.76×10~(-6),达到了Ga工业品位标准;锰矿层和围岩中w(Ga)平均分别为46.40×10~(-6)、19.31×10~(-6),高于国内外已报道的大部分锰矿床。文中根据北泗组碳酸锰矿床地球化学特征,揭示了该锰矿床为热水沉积;同时,结合现代大洋铁锰沉积有关Ga的最新报道,提出北泗组碳酸锰矿床中Ga的赋存与含锰矿物密切相关,其来源与海底热液活动有关。最后,文中还利用Mn/Fe-Ga、Co-Ga关系图判别了古代铁锰沉积的成因类型。
[Abstract]:Ga is a typical rare dispersed element, mainly occurring in bauxite, sphalerite and coal mines.Recently, in the lower Triassic Beisi formation manganese carbonate deposit in Dongping, Guangxi, it was found that the high Ga anomaly content was between 5.16 脳 10 ~ (-10) ~ (-6) and 82.80 脳 10 ~ (10) ~ (-6), with an average value of 33.76 脳 10 ~ (10) ~ (-6), which reached the standard of Ga industry grade.The average wanglunga in manganese layer and surrounding rock is 46.40 脳 10 ~ (-10) ~ (-6), 19.31 脳 10 ~ (10) ~ (-1) ~ (6), which is higher than that of most of the manganese ore deposits reported at home and abroad.According to the geochemical characteristics of the Besi formation manganese carbonate deposit, it is revealed that the manganese deposit is hydrothermal deposit, and the latest report on Ga in the modern oceanic iron-manganese deposit is also given in this paper.It is suggested that the occurrence of Ga in the Besi formation manganese carbonate deposit is closely related to manganese bearing minerals, and its source is related to submarine hydrothermal activity.Finally, the genetic types of the ancient iron and manganese deposits are identified by using the mn / Fe-Ga Co-Ga relationship diagram.
【作者单位】：成都理工大学沉积地质研究院;成都理工大学油气藏地质及开发工程国家重点实验室;中国地质科学院矿产资源研究所;成都理工大学地球科学学院;
【基金】：国家科技支撑计划专题项目(编号:2011BAB04B10-2)资助
【分类号】：P618.32

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