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西藏甲玛超大型矿床矽卡岩矿物组合及其分带模式*
投稿时间:2020-07-18  修订日期:2020-09-20  点此下载全文
引用本文:
DOI:10.19762/j.cnki.dizhixuebao.2021045
摘要点击次数: 84
全文下载次数: 92
作者单位地址
冷秋锋 中国地质调查局成都地质调查中心 四川省成都市金牛区一环路北三段2号
郑文宝 中国地质科学院矿产资源研究所 
唐攀 西南交通大学地球科学与环境工程学院 
林彬 中国地质科学院矿产资源研究所 
王艺云 中国地质调查局成都地质调查中心 
基金项目:中国地质调查局项目(DD20190444)和国家重点研发计划-深地专项(2018YFC0604101)的联合资助。
中文摘要:甲玛矿床作为我国规模最大的矽卡岩型铜多金属矿床,其保存了矽卡岩形成演化及成矿作用的重要信息。前人在矿床地质、矿床地球化学等方面对该矿床开展了详细的研究,但对于矽卡岩矿物学及其分带模式还缺少深入系统的总结,制约了矿床模型的完善。为此,本文通过详细的野外地质编录、系统的光薄片镜下鉴定和电子探针分析,开展矽卡岩矿物组合、矿物成分及其分带特征研究。本次工作在矿床中识别出一套典型的钙质矽卡岩矿物,包括石榴子石、辉石、硅灰石、符山石、绿帘石、绿泥石和角闪石等。矽卡岩矿物组合、化学成分及金属矿化在空间上具有明显分带性。硅灰石矽卡岩相对较独立,产于矽卡岩中下部与大理岩接触部位,主要赋存斑铜矿化,没有明显分带。透辉石-石榴子石矽卡岩从斑岩接触带近端矽卡岩→中部带矽卡岩→远端矽卡岩具有明显分带现象:石榴子石/辉石含量比值具有大于20∶1→约10∶1→约5∶1的变化趋势;石榴子石颜色由红-棕色→棕-绿色→绿-淡黄色;石榴子石端元组分为Ad71.82Gr26.52Pyr1.61→Ad62.09Gr36.26Pyr1.55→Ad54.37Gr44.10Pyr1.46,钙铁榴石(Ad)含量呈现减小的趋势;矿化元素表现为Mo-Cu±Au±Ag→Cu±Mo±Au±Ag→Pb-Zn±Cu±Au±Ag的分带规律。矽卡岩矿物组合和化学成分特征对于成矿环境及矿化类型具有重要指示意义,运用矽卡岩分带模式可以有效指导找矿勘探。
中文关键词:矽卡岩型矿床  矽卡岩矿物学  矽卡岩分带  甲玛矿床  冈底斯  西藏
 
Skarn mineral assemblage and zonation pattern in Jiama superlarge deposit, Tibet
Author NameAffiliationAddress
LENG QiuFeng Chengdu Center,China Geological Survey,Chengdu 四川省成都市金牛区一环路北三段2号
ZHENG WenBao MNR Key Laboratory of Metallogeny and Mineral Resource Assessment,Institute of Mineral Resources,CAGS 
TANG Pan Faculty of Geosciences and Environmental Engineering,Southwest Jiaotong University 
LIN Bin MNR Key Laboratory of Metallogeny and Mineral Resource Assessment,Institute of Mineral Resources,CAGS 
WANG Yiyun Chengdu Center,China Geological Survey,Chengdu 
Abstract:As the largest skarn type copper polymetallic deposit in China, the Jiama deposit has preserved the important information of skarn formation, evolution and mineralization. The geological and geochemical characteristics of the Jiama deposit have been studied by some researchers, but there is still a lack of summary of skarn mineralogy and its zoning pattern, which restricts the perfection of the deposit model. In this paper, the mineral assemblage, mineral composition and zonation characteristics of skarn are studied through detailed field geological logging, systematic optical microscopy and electron probe analysis. A set of typical calcareous skarn minerals have been identified in the deposit, including garnet, pyroxene, wollastonite, vesuvianitae of prograde stage and epidote, chlorite, amphibole of retrograde stage. The mineralogy and mineral chemical compositions display an outward zonation with respect to the source porphyry. The wollastonite skarn mainly present to the contact zone between skarn and marble, and displays no zonation and hosts mainly bornite mineralization. From the proximal skarn to the intermediate skarn to the distal skarn in the garnet-pyroxene skarn, the garnet/pyroxene ratio varies from >20:1 to ~10:1 to ~5:1, the garnet color varies from red-brown to brown-green to green-yellow, the average compositon of garnet varies from Ad71.82Gr26.52Pyr1.61 to Ad62.09Gr36.26Pyr1.55 to Ad54.37Gr44.10Pyr1.46, and the mineralization changes from Mo-Cu±Au±Ag to Cu±Mo±Au±Ag to Pb-Zn±Cu±Au±Ag ores, respectively. The mineral assemblage and chemical composition characteristics of skarn are important indicators of ore forming environment and mineralization type. The skarn zonation pattern can effectively guide ore prospecting and exploration.
keywords:Skarn Deposits  Skarn Mineralogy  Skarn Zonation  Jiama Deposit  Gangdes  Tibet
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