广西天峨坪金矿床硫化物微量元素组成及铅同位素特征分析
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摘要
广西天峨坪金矿床为云开地块新发现具中型规模的金矿床,主要以浸染状矿化产于博白-岑溪断裂带次级断裂带蚀变岩中。蚀变主要有绢云母化、玉髓状硅化、黄铁矿化及碳酸盐化,为低温蚀变组合。分析了早矿化阶段(0.1≤Au≤1.0μg/g)、主矿化阶段(Au≥5μg/g)及其中特富矿段(Au≥20μg/g)和晚矿化阶段(Au≤1.0μg/g)中的黄铁矿和银黝铜矿主元素和微量元素组成以及黄铁矿的Pb同位素组成。主矿化阶段黄铁矿Ni含量在0.02%～0.24%之间,平均0.07%, Cu和As含量多小于0.01%;早晚矿化阶段黄铁矿Ni含量多小于0.01%、Cu含量平均为0.13%、As含量在0.02%～3.08%之间。主矿化阶段银黝铜矿Ag含量大于17.4%、As含量小于0.68%、Cu含量小于25%,而晚矿化阶段银黝铜矿Ag含量小于1.6%、As含量大于2.12%、Cu含量大于35%。天峨坪金矿床不同矿化阶段黄铁矿的Co/Ni比值主要位于热液成因区。主矿化阶段黄铁矿和早及晚矿化阶段黄铁矿Ni、Co、As含量在Co-Ni-As图上位于不同区域,主矿化阶段黄铁矿具高Ni含量、低Co/Ni比值及低As和Cu含量,而早及晚矿化阶段黄铁矿则具低Ni含量、高Co/Ni比值以及高As和Cu含量。主矿化阶段特富矿段银黝铜矿相对富Ag而贫Cu、As,而晚矿化阶段银黝铜矿则相对贫Ag而富Cu、As。黄铁矿及银黝铜矿元素组成特征表明,天峨坪金矿床主矿化阶段流体除更富Au外,还相对富Ag和Ni,贫As和Cu;早晚矿化阶段成矿流体相对富As和Cu,贫Ni。天峨坪金矿床和云开地块的基底变质岩及其中一些金矿床的Pb同位素组成相似,结合主矿化阶段黄铁矿相对富Ni的特征,暗示主矿化阶段成矿物质主要来自富Au及相对富易溶解Ni的元古宙基底。
The recently discovered Tian'eping medium-sized gold deposit is located in the Yunkai Block, Guangxi Zhuang Autonomous Region. Gold mineralization mainly occurred due to dissemination of the alteration rocks in the second fault of the Bobai-Cenxi fault belt. Hydrothermal alteration mainly includes sericitization, silicification, pyritization, and carbonatization, indicating low temperature alteration and mineralization. Mineralization and alteration characteristics show that the Tian'eping gold deposit could be classified as a low temperature structural altered-rock type gold deposit. The composition of main and trace elements of pyrite and freibergite were analyzed from the main stages of gold mineralization(Au content >5 g/t) and the bonanza zone(Au content >20 g/t), early stage of gold mineralization(Au content <1.0 g/t), and late stage pyrite veins(Au <1.0 g/t). Additionally, the Pb isotope composition of sulfide of the Tian'eping gold deposit was analyzed. Pyrite from the main stage of gold mineralization and bonanza zone had Ni content varying from 0.02% to 0.24%, with an average of 0. 07%, and Cu and As content of less than 0. 01%. In contrast, pyrite from early stage of gold mineralization and late stage pyrite veins had Ni content less than 0.01%, average Cu content of 0.13% and As content varying from 0.02% to 3.08%. Freibergite from the main stage of gold mineralization had Ag content more than 17.4%, As content less than 0.68%, and Cu content less than 25%. Freibergite from the late stage pyrite veins had Ag content less than 1.61%, As content more than 2.12%, and Cu content more than 35%. Pyrites from different stages of mineralization had Co/Ni values located on the domain of hydrothermal genetic pyrite. Pyrite from the main stage of gold mineralization was located on different domains of the Co-Ni-As triangular plot from the pyrite of early and late stage mineralization. The element variation characteristics of pyrite and freibergite at different mineralization stages show that the sulfides from the main stage of mineralization had much higher concentrations of Ni and Ag and lower concentrations of Cu and As than the early and late stages of mineralization. This suggests that the ore forming fluids of the main stage of gold mineralization had higher concentrations of Au, Ag, and Ni and lower concentration of As and Cu than the ore forming fluids of the early and late stages of mineralization. Pb isotopic composition shows that the Proterozoic basement was one of the main sources of the ore-forming material of the Tian'eping gold deposit
The recently discovered Tian'eping medium-sized gold deposit is located in the Yunkai Block, Guangxi Zhuang Autonomous Region. Gold mineralization mainly occurred due to dissemination of the alteration rocks in the second fault of the Bobai-Cenxi fault belt. Hydrothermal alteration mainly includes sericitization, silicification, pyritization, and carbonatization, indicating low temperature alteration and mineralization. Mineralization and alteration characteristics show that the Tian'eping gold deposit could be classified as a low temperature structural altered-rock type gold deposit. The composition of main and trace elements of pyrite and freibergite were analyzed from the main stages of gold mineralization(Au content >5 g/t) and the bonanza zone(Au content >20 g/t), early stage of gold mineralization(Au content <1.0 g/t), and late stage pyrite veins(Au <1.0 g/t). Additionally, the Pb isotope composition of sulfide of the Tian'eping gold deposit was analyzed. Pyrite from the main stage of gold mineralization and bonanza zone had Ni content varying from 0.02% to 0.24%, with an average of 0. 07%, and Cu and As content of less than 0. 01%. In contrast, pyrite from early stage of gold mineralization and late stage pyrite veins had Ni content less than 0.01%, average Cu content of 0.13% and As content varying from 0.02% to 3.08%. Freibergite from the main stage of gold mineralization had Ag content more than 17.4%, As content less than 0.68%, and Cu content less than 25%. Freibergite from the late stage pyrite veins had Ag content less than 1.61%, As content more than 2.12%, and Cu content more than 35%. Pyrites from different stages of mineralization had Co/Ni values located on the domain of hydrothermal genetic pyrite. Pyrite from the main stage of gold mineralization was located on different domains of the Co-Ni-As triangular plot from the pyrite of early and late stage mineralization. The element variation characteristics of pyrite and freibergite at different mineralization stages show that the sulfides from the main stage of mineralization had much higher concentrations of Ni and Ag and lower concentrations of Cu and As than the early and late stages of mineralization. This suggests that the ore forming fluids of the main stage of gold mineralization had higher concentrations of Au, Ag, and Ni and lower concentration of As and Cu than the ore forming fluids of the early and late stages of mineralization. Pb isotopic composition shows that the Proterozoic basement was one of the main sources of the ore-forming material of the Tian'eping gold deposit
引文
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