云南易门狮子山铜矿床基性侵入岩地球化学特征及其地质意义
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摘要
云南易门狮子山矿床是元古宙昆阳裂谷内的典型铜矿床之一。近年在狮子山矿床深部发现基性侵入岩—辉长岩,本文主要介绍了狮子山矿区辉长岩体地质特征、岩石学和岩石地球化学特征,并且讨论了辉长岩岩石类型、构造环境判别、源区性质、成因过程和含矿性等特征。
(1)辉长岩形成于大陆初始裂谷环境,具有板内玄武岩特征。区内辉长岩体呈岩脉或岩床沿NE向断裂、NW向断裂及层间破碎带侵入到中元古代昆阳群落雪组、因民组内。结合区域地质背景,认为该区辉长岩可能是晋宁—澄江期侵入的产物。
(2)辉长岩SiO2含量为44.65%～48.35%；Na2O+K2O的含量较高,范围为4.62%-7.63%,显碱性,Na2O/K20均大于1,显示了高钠低钾的特点；主量元素Harker图解表明辉长岩是由玄武岩浆演化过程中受地壳物质同化混染而成。
(3)不相容元素表现为大离子亲石元素K、Rb、Th明显富集,Sr、Ta、Nb、Yb、Cr、Y等元素亏损,显示了大陆裂谷玄武岩的特征；Ti、Pb、Mo等亲铜元素和Co、V普遍较高,亲铁元素Cr、Ni和亲氧元素Sc含量偏低,反映辉长岩是与深源岩浆作用有关的成因类型；
(4)稀土元素组成及特征参数相对稳定,轻稀土分馏较好。δEu显弱负异常、δCe异常不明显和(La/Yb)N均大于4的特征反映了轻稀土丰度相对较高的壳源物质参与岩浆作用的结果。
(5)狮子山与东川的辉长岩在形成时代、岩体特征、岩石地球化学特征和岩体含矿性特征具有一定的相似性。两个矿区多个辉长岩体具有不同程度的铜铁钛矿化,且少数岩体中(新塘、白锡腊矿区)已发现工业矿体,表明基性岩浆侵入可以直接形成矿体,对狮子山矿区下一步该类矿(化)体的找矿提供了新思路。
Shizishan Copper deposit in Yimen Yunnan is the one of typical deposit which located at the Kunyang Rift of Proterozoic。We discovered basic intrusive rock-gabbro in shizishan copper deposit in recent years。This paper describes geological features、petrology and geochemical characteristics of gabbro in the Shizishan Copper, and discussed the gabbro rock type、tectonic discrimination、source region、the causes of the process and ore。
(1) The gabbros formed in initial continental rift environment, and has intraplate basalt feature。The gabbros are in the form of dyke or sill along the NE trending faults or NW-trending fault and fracture zone between layers penetrated into the each stratum of kunyang Group in the Shizishan Copper。Combined with regional geological background, the paper believe that the gabbros may be formed in the jinning-chengjiango
(2) The concentration of SiO2 of The gabbros are between 44.65% and 48.35%, Na2O+K2O are between 4.62% and 7.63%, Na2O/K2O>1, which shows the characteristics of high Na low K; Harker diagrams of major elements show that the gabbro is the evolution of basaltic magma by assimilation of crustal material。
(3) Relative neglect elements expressed as highly enriched in K、Rb、Th,lowly in Sr、Nb、Yb、Cr、Y, similar to the intra-continental rift basalts; The gabbros has higher contents such as Ti、Pb、Mo、Co、V, and Cr、Ni、Sc were lower, which show that the gabbros were related to the role of deep magma causes of type;
The composition and characteristic of REE are relatively stable, LREE has better fractionation。no pronounced Eu and Ce negative anomaly and (La/Yb) N greater than 4 show that the role of crustal material involved in the result of magma。
Shizishan gabbros are similar to the Dongchuan gabbros in the formation of age、rock characteristics、geochemical characteristics and ore-bearing rock characteristics。Numbers of gabbros has various degrees of Cu、Fe、Ti mineralization, and a few ore bodies had been found in Xintang and Baixila deposit, which show that the mafic magma intrusion can form ore。These will provide a new way to the next prospecting in this ore bodies。
(1)辉长岩形成于大陆初始裂谷环境,具有板内玄武岩特征。区内辉长岩体呈岩脉或岩床沿NE向断裂、NW向断裂及层间破碎带侵入到中元古代昆阳群落雪组、因民组内。结合区域地质背景,认为该区辉长岩可能是晋宁—澄江期侵入的产物。
(2)辉长岩SiO2含量为44.65%～48.35%；Na2O+K2O的含量较高,范围为4.62%-7.63%,显碱性,Na2O/K20均大于1,显示了高钠低钾的特点；主量元素Harker图解表明辉长岩是由玄武岩浆演化过程中受地壳物质同化混染而成。
(3)不相容元素表现为大离子亲石元素K、Rb、Th明显富集,Sr、Ta、Nb、Yb、Cr、Y等元素亏损,显示了大陆裂谷玄武岩的特征；Ti、Pb、Mo等亲铜元素和Co、V普遍较高,亲铁元素Cr、Ni和亲氧元素Sc含量偏低,反映辉长岩是与深源岩浆作用有关的成因类型；
(4)稀土元素组成及特征参数相对稳定,轻稀土分馏较好。δEu显弱负异常、δCe异常不明显和(La/Yb)N均大于4的特征反映了轻稀土丰度相对较高的壳源物质参与岩浆作用的结果。
(5)狮子山与东川的辉长岩在形成时代、岩体特征、岩石地球化学特征和岩体含矿性特征具有一定的相似性。两个矿区多个辉长岩体具有不同程度的铜铁钛矿化,且少数岩体中(新塘、白锡腊矿区)已发现工业矿体,表明基性岩浆侵入可以直接形成矿体,对狮子山矿区下一步该类矿(化)体的找矿提供了新思路。
Shizishan Copper deposit in Yimen Yunnan is the one of typical deposit which located at the Kunyang Rift of Proterozoic。We discovered basic intrusive rock-gabbro in shizishan copper deposit in recent years。This paper describes geological features、petrology and geochemical characteristics of gabbro in the Shizishan Copper, and discussed the gabbro rock type、tectonic discrimination、source region、the causes of the process and ore。
(1) The gabbros formed in initial continental rift environment, and has intraplate basalt feature。The gabbros are in the form of dyke or sill along the NE trending faults or NW-trending fault and fracture zone between layers penetrated into the each stratum of kunyang Group in the Shizishan Copper。Combined with regional geological background, the paper believe that the gabbros may be formed in the jinning-chengjiango
(2) The concentration of SiO2 of The gabbros are between 44.65% and 48.35%, Na2O+K2O are between 4.62% and 7.63%, Na2O/K2O>1, which shows the characteristics of high Na low K; Harker diagrams of major elements show that the gabbro is the evolution of basaltic magma by assimilation of crustal material。
(3) Relative neglect elements expressed as highly enriched in K、Rb、Th,lowly in Sr、Nb、Yb、Cr、Y, similar to the intra-continental rift basalts; The gabbros has higher contents such as Ti、Pb、Mo、Co、V, and Cr、Ni、Sc were lower, which show that the gabbros were related to the role of deep magma causes of type;
The composition and characteristic of REE are relatively stable, LREE has better fractionation。no pronounced Eu and Ce negative anomaly and (La/Yb) N greater than 4 show that the role of crustal material involved in the result of magma。
Shizishan gabbros are similar to the Dongchuan gabbros in the formation of age、rock characteristics、geochemical characteristics and ore-bearing rock characteristics。Numbers of gabbros has various degrees of Cu、Fe、Ti mineralization, and a few ore bodies had been found in Xintang and Baixila deposit, which show that the mafic magma intrusion can form ore。These will provide a new way to the next prospecting in this ore bodies。
引文
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