摘要
本文系统分析和总结了甘肃西秦岭龙得岗斑岩铜矿成矿地质背景和成矿特征,研究了成矿条件、成矿规律、成矿模式:印支、燕山期沿岷县-合作断裂带以北的中秦岭前陆盆地构造区岩浆频繁活动,岩浆携带了较丰富的成矿物质,岩浆在上升、侵位和演化过程中,不断萃取围岩中的成矿物质,使其不断富集,在岩体冷凝成岩过程中,因固结收缩,边部产生裂隙,成矿物质不断富集的残余岩浆沿边部裂隙贯入,充填及富集沉淀,在成矿有利部位交代形成"斑岩型"铜矿(化)体,部分富Cu流体在有利部位富集沉淀,形成"热液型"铜矿脉。系统总结了找矿标志,燕山早期花岗闪长(斑)岩及接触带,有自然重砂及Cu、Pb、Ag、Zn地球化学异常地段为找矿有利地段,对西秦岭地区同类型矿产的找矿工作具有一定的指导意义。
This paper analyzed the geological characteristics and regional prospecting indicators as well as metallogenic conditions, regularity and the metallogenic model of the Longdegang porphyry copper deposit in West Qinling, Gansu Province. The results suggest that in the Indosinian and Yanshanian periods, frequent magama activities occurred along the Middle Qinling foreland basin north of the Minxian - Hezuo fault. These magmas carried abundant metallogenic material, and extracted ore -forming material from the county rock during their rise, emplacement and evolution processes, which made the further enrichment of the ore - forming elements. When the magma condensed into magmatic rocks, fractures occurred in the marginal rocks, then the ore - forming elements accumulated, filled and precipitated in the fractures, and formed porphyritic copper ore bodies by metasomatism. Some other metallogenic flow enriched and precipitated in the favorable space,which generated hydrothermal copper veins. We summarized the prospecting indicators as the early Yanshanian granodiorites and contact zones, anomalous natural heavy minerals and Cu, Pb, Ag and Zn elements. This study is of significance to guide searching for the mineral deposits of the similar type in the West Qinling region.
出处
《地质与勘探》
CAS
CSCD
北大核心
2012年第6期1077-1086,共10页
Geology and Exploration
关键词
斑岩铜矿床
地质特征
找矿标志
龙得岗
甘肃秦岭
porphyry copper deposit, geological characteristics, regional prospecting indicators, 0inling, Gansu
