文章摘要
张 翔.甘肃省玛曲县大水金矿原生金矿石的发现及意义[J].地质与勘探,2019,55(2):484-495
甘肃省玛曲县大水金矿原生金矿石的发现及意义
Discovery and significance of primary gold ore in Dashui gold deposit, Maqu county, Gansu Province
投稿时间:2017-10-11  修订日期:2018-09-20
DOI:10.12134/j.dzykt.2019.02.004
中文关键词: 原生矿石 地球化学 矿源层 喷流成矿 大水金矿 玛曲县 甘肃省
英文关键词: primary ore, geochemistry, source bed, spout sediment, Dashui gold deposit, Maqu county, Ganu Province
基金项目:甘肃省省级基础地质科研类项目(编号:2016BG13)资助
作者单位E-mail
张 翔 甘肃省地质调查院甘肃兰州 兰州大学资源环境学院西部环境教育部重点实验室甘肃兰州 甘肃省地质矿产勘查开发局甘肃兰州 甘肃省地矿局第三地质矿产勘查院甘肃兰州 916685598@qq.com 
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中文摘要:
      甘肃玛曲县大水金矿是西秦岭地区规模最大、类型独特的金矿床之一,在多年的矿床勘探和开发过程中,在400m以上从未发现过原生金矿体或金矿石,因而对该矿床的成因认识一直存在着争论。本文利用矿山在89线竖井开拓过程中发现的原生金矿石,通过岩矿鉴定、微量元素和稀土元素分析,发现矿区存在英安质凝灰岩,是金矿石寄主岩石之一。原生金矿石具块状、条带状和角砾状构造,凝灰岩矿石或角砾具海底喷流沉积特征。新发现的原生金矿石与花岗闪长斑岩、黑云石英闪长玢岩型金矿石具有不同的微量元素、稀土元素变化趋势和硫同位素值,指示原生金矿石可能经历了喷流和后期岩浆热液改造两个阶段的成矿,这些发现对认识大水金矿床成因和今后找矿方向具有重要指导意义。
英文摘要:
      The Dashui gold deposit is one of the largest and special type of gold deposits in the West Qinling orogen. During the exploration and development for many years, the primary gold ore bodies or gold ores have never been found at least above depth 400 meters in this mine. And the genesis of this deposit remains controversial. This work used the primary gold ore found in a shaft on the exploration line No.89 to conduct rock-mineral identification and analyses of microelements and rare earth elements. Results suggest that primary gold ores are hosted in dacitic tuff. The ores are of massive, banded and breccia shapes. The ore-bearing tuff or rubble is characterized by submarine spout sediments. These protogenetic ores are different in geochemistry from granodiorite porphyry and biotite quartz diorite porphyry, and have sulfur isotope (δ34S ranges 9.79%~10.11%), indicating their mineralization has experienced two stages: early spout and later reform of magma thermal fluids. These findings can shed light on understanding the genesis of the gold deposits and the prospecting direction in the future.
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