河北省涞源县木吉村铜(钼)多金属矿田成矿物质来源探讨

doi:10.13278/j.cnki.jjuese.201501109

摘要/Abstract

摘要：

木吉村铜(钼)矿田位于太行山脉中、北段阜平幔枝构造的北东倾伏端, 涞源哑铃状杂岩体连接处西侧上盘拆离带的次级断陷盆地中, 主要由斑岩型铜(钼)矿、矽卡岩型铁铜矿和外围热液脉型铅锌矿构成, 是河北省目前探明的唯一大型铜(钼)多金属矿田, 找矿远景巨大。鉴于矿床成矿物质来源在研究矿床成因和指导找矿中的重要作用, 对木吉村矿田主要矿床矿石中黄铁矿、黄铜矿、方铅矿、辉钼矿、磁铁矿、石英和石膏等单矿物进行了硫、铅、碳、氢、氧、硅、铼等同位素测定、对比和分析。结果表明:矿田中硫同位素主值域δ³⁴S=-3.5‰~3.2‰, 主平均值为0.3‰;铅同位素²⁰⁶Pb/²⁰⁴Pb=15.566 0~17.072 0, 平均为16.547 0, ²⁰⁷Pb/²⁰⁴Pb=15.031 0~15.523 0, 平均为15.258 0, ²⁰⁸Pb/²⁰⁴Pb=36.292 0~37.375 0, 平均为36.721 0;碳同位素δ¹³C为-2.94‰~-2.18‰, 平均为-2.62‰;硅同位素δ³⁰Si_NBS-28值域为-0.3‰~0.2‰, 平均0.0‰;辉钼矿w(Re)为(23.65~266.50)×10^-6, 平均值为142.33×10^-6;δ¹⁸O_H₂O值为-10.64‰~7.70‰, 极差为18.34‰, 平均值为-1.47‰, 较标准岩浆水值稍低, δD值为-148.4‰~-89.0‰, 极差为59.4‰, 平均值为-113.7‰, 略低于岩浆岩δD值域。从而认为, 木吉村矿田成矿物质主要来源于地球深部, 成矿溶液以岩浆水为主, 部分来自大气降水。

关键词: 幔枝构造, 物质来源, 成矿溶液, 铜(钼)矿床, 木吉村矿田, 太行山

Abstract:

The Mujicun copper (molybdenum) polymetallic orefield in the Taihang Mountains, is located in the secondary faulted basin developed in the upper block of detachment zone on the west side of the neck of the dumbbell shaped Laiyuan igneous complex, the northeastern pitching end of the Fuping mantle branch structure. It is composed of porphyry copper (molybdenum) deposit, skarn iron-copper deposit and hydrothermal vein lead-zinc-silver deposit in periphery, and become the most perspective large-scale copper (molybdenum) polymetallic orefield in Hebei Province at present. Considering the study of ore-forming material sources is crucial for further understanding the metallogenesis of the deposit and the direction of ore-prospecting, authors tested and analyzed sulfur, lead, carbon, hydrogen, oxygen, silicon, and rhenium isotopic compositions in such minerals from the ore as chalcopyrite, galena, pyrite, molybdenite, magnetite, quartz and gypsum. The data showed that the major value of δ³⁴S changes from -3.5‰ to 3.2‰, with the average of 0.3‰;²⁰⁶Pb/²⁰⁴Pb from 15.566 0 to 17.072 0, with the average of 16.547 0;²⁰⁷Pb/²⁰⁴Pb from 15.031 0 to 15.523 0, with the average of 15.258 0;²⁰⁸Pb/²⁰⁴Pb from 36.292 0 to 37.375 0, with the average of 36.721 0;δ¹³C from -2.94‰ to -2.18‰, with the average of -2.62‰;δ³⁰Si from -0.3‰ to 0.2‰, with the average of 0.0‰;w(Re) from 23.65 μg/g to 266.50 μg/g, with the average of 142.33 μg/g;δ¹⁸O_H₂O from -10.64‰ to 7.70‰, with the average of -1.47%, δD from -148.4‰ to -89.0‰, with the average of -113.7‰ which is less than that of the standard magmatic water. These isotopic data mentioned above show that the ore-forming materials were mainly derived from the deep source and the ore-forming solutions are mainly composed of magmatic water and partly of atmospheric water.

Key words: mantle branch structure, ore-forming material sources, ore-forming solution, copper (molybdenum) deposit, Mujicun orefield, Taihang Mountains

中图分类号:

P618.3

陈超, 王宝德, 牛树银, 张福祥, 马宝军, 张建珍, 孙爱群, 王海涛, 马国玺, 陈志宽, 王自力. 河北省涞源县木吉村铜(钼)多金属矿田成矿物质来源探讨[J]. 吉林大学学报(地球科学版), 2015, 45(1): 106-118.

Chen Chao, Wang Baode, Niu Shuyin, Zhang Fuxiang, Ma Baojun, Zhang Jianzhen, Sun Aiqun, Wang Haitao, Ma Guoxi, Chen Zhikuan, Wang Zili. Discussion on the Ore-Forming Material Sources of Mujicun Copper (Molybdenum) Polymetallic Orefield in Laiyuan County, Hebei Province, China[J]. Journal of Jilin University(Earth Science Edition), 2015, 45(1): 106-118.

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