| 青海卡尔却卡铜多金属矿床地球化学特征与成矿物质来源 |
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| 引用本文： | 赖健清,黄敏,宋文彬,苏生顺,王守良.青海卡尔却卡铜多金属矿床地球化学特征与成矿物质来源[J].地球科学,2015,40(1):1-16. |
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| 作者姓名： | 赖健清 黄敏 宋文彬 苏生顺 王守良 |
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| 作者单位： | 1.中南大学有色金属成矿预测教育部重点实验室, 湖南长沙 410083 |
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| 基金项目： | 中国地质调查局“祁漫塔格地区成矿条件研究与找矿靶区优选”项目，中国地质调查局“祁漫塔格成矿带铁铜多金属成矿作用与勘查方法技术试验研究”项目 |
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| 摘 要： | 为了解卡尔却卡铜多金属矿床的物质来源, 探讨其成岩、成矿机制, 通过现场调查, 结合矿床地质成矿条件, 对矿区典型的岩浆岩、围岩及矿石进行了主量元素、微量元素分析及S、Pb同位素分析.结果表明: 矿区岩体属中酸性岩, 为高钾钙碱性系列岩石, 源于深部, 上侵时受地壳混染, 具同源特征.不同地质体稀土配分曲线均为右倾轻稀土富集型, 岩浆岩、矽卡岩和矿石为同一成矿系统.微量元素地球化学显示矿区花岗岩产于火山弧环境.矿石硫同位素δ34SCDT值为4.4×10-3~11.0×10-3, 处于岩浆硫跟围岩混合硫范围内, 成矿物质具多源性.矿石铅同位素Th/U值范围为3.46~3.69, μ值为9.46~9.52, 均低于9.58, 介于地壳与原始地幔值之间, 反应矿石铅具深源铅和壳源铅特征.铅同位素特征参数示踪、构造模式示踪和Δβ-Δγ图解示踪的结果表明: 铅来源与岩浆作用有关, 以壳源铅为主并混合少量深源地幔铅.总结矿床地球化学特征表明成矿物质主要来源于岩浆, 少量来源于周围地层.矿区岩体成矿演化过程复杂, 在岩体中形成斑岩型铜、钼矿化, 在与碳酸盐岩接触带形成矽卡岩型铅、锌矿化, 及至后期热液作用形成中低温热液脉型金矿化, 是一个多因复成矿床.
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| 关 键 词： | 地球化学 同位素 成矿物质来源 卡尔却卡 青海省 |
| 收稿时间： | 2014-04-03 |
Geochemical Characteristics and Source of Ore-Forming Materials of Kaerqueka Copper Polymetallic Deposit in Qinghai Province,China |
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| Lai Jianqing,Huang Min,Song Wenbin,Su Shengshun,Wang Shouliang.Geochemical Characteristics and Source of Ore-Forming Materials of Kaerqueka Copper Polymetallic Deposit in Qinghai Province,China[J].Earth Science-Journal of China University of Geosciences,2015,40(1):1-16. |
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| Authors: | Lai Jianqing Huang Min Song Wenbin Su Shengshun Wang Shouliang |
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| Affiliation: | Lai Jianqing;Huang Min;Song Wenbin;Su Shengshun;Wang Shouliang;Key Laboratory of Metallogenic Prediction of Nonferrous Metals,Ministry of Education,Central South University;School of Geosciences and Info-Physics,Central South University;Hunan Research Academy of Geological Sciences;Third Institute of Qinghai Geological Mineral Prospecting; |
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| Abstract: | Combined with field investigation and ore-forming geological conditions of the Kaerqueka copper polymetallic deposit, the geochemical characteristics of the deposit are summarized, the origin of the ore-forming materials is ascertained, and the rock-forming and ore-forming mechanisms are discussed according to the S, Pb isotopes as well as chemical analysis, including major element analysis, trace element analysis. Results of typical magmatic rocks, wall rocks and ores show that the magmatic rocks which were derived from deep and affected by crustal contamination during intrusion are intermediate acidity comagmatic rocks and belong to the high-K calc-alkaline series. All REE distribution patterns of different geologic bodies incline to the right and LREE-rich, indicating that the magmatic rock, skarn and ore belong to the same metallogenic system. The geochemistry of trace elements shows that the granites of the deposit occurred in volcanic arc environment. The δ34SCDT values of ore minerals lie between those of magmatic rock and country rock sulfur, with a range of 4.4‰ to 11.0‰, which indicates various metallogenic material sources. The Th/U values of lead isotope in ore minerals range from 3.46 to 3.69 and the μ values range from 9.46 to 9.52 (< 9.58), which fall between the values of crust and primitive mantle and indicate that the ore lead is characterized by both deep-sourced and crust-sourced origins. The tracer analysis regarding the characteristic parameters, lead composition model and Δβ-Δγ diagram show that the ore lead is mainly crust-derived and mixed with minor mantle-derived lead and affected by magmatism. The geochemical characteristics of Kaerqueka deposit suggest that the ore-forming materials mainly originated from magma with minor strata substance. The complicated evolution of magmatic rock is revealed by the porphyry-type copper-molybdenum mineralization in magmatic rock, the skarn-type lead-zinc mineralization following the contact of carbonate rock and the late low-medium hydrothermal vein-type gold mineralization, which indicates the Kaerqueka deposit is a polygenetic compound deposit. |
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| Keywords: | geochemistry isotope ore-forming material source Kaerqueka Qinghai Province |
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