摘要
广西宜州是石炭纪沉积型锰矿较为发育的地区。本文以区内具有代表性的龙头锰矿床作为研究对象,系统开展了锶同位素组成研究。锰矿石^(87)Sr/^(86)Sr比值为0.708172~0.708213,平均0.708200,围岩^(87)Sr/^(86)Sr比值为0.708181~0.708248,平均0.708214,反映锰矿成矿物质可能具有多元混合的特征。结合岩相学研究,认为海底热液活动和陆源风化作用共同控制锰矿成矿。龙头锰矿床从Ⅰ矿层到Ⅳ矿层的矿石和围岩^(87)Sr/^(86)Sr比值呈现逐渐降低的趋势,认为可能与古大陆风化作用及对锰矿有重要控制作用的龙头式台沟阶段演化有关。
The Yizhou area of Guangxi Province is an important area in which many Carboniferous sedimentary manganese deposits are relatively developed. In this paper, the representative Longtou manganese deposit in the Yizhou area has been taken as the research object to systematically study the strontium isotope composition. The ^(87)Sr/^(86)Sr ratios of manganese ores range from 0.708172 to 0.708213, with an average of 0.708200. The ^(87)Sr/^(86)Sr ratios of wallrocks range from 0.708181 to 0.708248, with an average of 0.708214.These reflect that the ore-forming materials of manganese ores may have the characteristics of multivariate mixing. Combined with petrographic studies, it is considered that the submarine hydrothermal activity and continental weathering had jointly controlled the manganese ore mineralization. Meanwhile, the ^(87)Sr/^(86)Sr ratios of ores and wallrocks from the I, to II, III, to IV ore-layers of the Longtou manganese deposit are gradually decreased, inferring that this characteristics could be related to the continental weathering and the Longtou platform trench evolution which played an important controlling role in the manganese mineralization.
作者
周许梅
高军波
杨瑞东
陈军
徐海
薛忠喜
杨贵园
ZHOU Xu-mei;GAO Jun-bo;YANG Rui-dong;CHEN Jun;XU Hai;XUE Zhong-xi;Yang Gui-yuan(College of Resources and Environmental Engineering,Guizhou University,Guiyang 550025,China;Key Laboratory of Karst Geological Resources and Environment,Ministry of Education,Guizhou University,Guiyang 550025,China;Department of Tourism and Geography,Tongren University,Tongren 554300,China)
出处
《矿物学报》
CAS
CSCD
北大核心
2023年第2期185-190,共6页
Acta Mineralogica Sinica
基金
国家自然科学基金项目(编号:42163006,41890841,U1812402)
贵州省科学技术厅项目(编号:黔科合战略找矿[2022]ZD004,黔科合平台人才[2018]5613)
贵州省人才基地项目(编号:RCJD2018-21)
贵州大学培育项目(编号:[2020]7)
关键词
锶同位素
锰矿
石炭纪
广西宜州
Strontium isotope
manganese deposit
Carboniferous
the Yizhou area of Guangxi
