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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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北秦岭西部陕西铜峪VHMS型铜矿床矿化地质特征、成矿背景与矿床成因
, PP. 970-995
Keywords: 北秦岭西部,VHMS型铜矿床,成矿背景,矿床成因
Abstract:
？本文对位于北秦岭西部斜峪关群中的陕西铜峪铜矿床矿化地质特征和矿石、矿化岩、赋矿火山岩围岩的主量、微量元素地球化学特征进行了详细研究,并对侵入于矿区南部的煤沟花岗闪长岩进行了单颗粒锆石LA-ICP-MSU-Pb精确定年、Lu-Hf同位素分析及岩石地球化学研究.研究表明,赋矿火山岩围岩为钙碱性岛弧火山岩,成矿物质与火山岩围岩具有相同的物质来源.铜峪铜矿床是古秦岭洋板片在472Ma左右的俯冲事件中,由俯冲板片脱水产生的高氧逸度流体进入地幔楔,活化萃取地幔楔的Cu等金属元素并导致地幔楔部分熔融产生的钙碱性岩浆在岛弧区喷发形成的VHMS型矿床.煤沟花岗闪长岩锆石U-Pb加权平均年龄为(439.3±3)Ma,显示其形成与古秦岭洋板片在440Ma左右的俯冲事件有关,岩石具有高Mg#,富Ni和Cr,轻重稀土强烈分馏,Eu异常不明显,高Sr、低Y、高Sr/Y比值,锆石Hf二阶段模式年龄集中在908~723Ma之间,εHf(t)>0,表明煤沟花岗闪长岩体属于俯冲的古秦岭洋玄武质板片部分熔融产生的熔体与地幔楔发生交代作用形成的具埃达克岩性质的岛弧花岗岩.铜峪铜矿床属形成于奥陶-志留纪之交((439.3±3)~(472±11)Ma))岛弧环境中的VHMS型块状硫化物矿床,与火山岩同期的火山喷流-沉积作用形成了该矿床的初始矿化;初始矿体形成后,伴随秦岭造山带印支期全面碰撞造山过程,矿体和含矿层受到强烈的构造改造和叠加.铜峪铜矿床与经典的VHMS型如日本黑矿型块状硫化物矿床存在差异,其矿化地质特征显示出岛弧火山喷发沉积和构造叠加改造成矿的双重特点.因此,铜峪铜矿床应为岛弧火山喷发沉积-构造叠加改造型矿床.
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