發(fā)布時間：2019-01-25 19:40

【摘要】：大河溝銻礦床分布在中元古界秦嶺群變質(zhì)巖內(nèi),礦體產(chǎn)出受雙槐樹深大斷裂及其旁側(cè)斷裂控制,是一個構(gòu)造控礦因素明顯的低溫熱液礦床。為了深入探索它的成礦構(gòu)造與成礦元素富集的有機聯(lián)系及成礦機理,選擇礦床內(nèi)典型構(gòu)造巖開展了構(gòu)造巖特征和礦石的主微量元素、礦石礦物學、同位素地球化學和包裹體測試等分析。研究結(jié)果表明:礦床分布受區(qū)域韌性剪切帶的控制,礦體圍巖的糜棱巖化時限198.6"4.74Ma,并具有成礦元素礦源層的性質(zhì);輝銻礦可能在單一環(huán)境和封閉條件下形成,有獨特的輝銻礦晶體特征峰值,含高的As、Au、Ag、Mo、Hg、Pb和Zn元素;方解石礦物的C—O同位素屬于巖漿-地幔來源;輝銻礦硫同位素的值域為δ34S介于1.8‰~2.6‰之間,鉛同位素顯示地層鉛的變化與輝銻礦相近;包裹體成分的測定表明流體具有硫酸鹽的性質(zhì),局部為重碳酸根型水溶液,以熱液改造沉積鹵水為特征,成礦作用在還原條件下進行,石英包裹體中含有較高的H2暗示成礦流體具有深源性質(zhì)。綜合研究認為,礦床形成作用是深部熱流體沿深大斷裂活動,萃取了韌性剪切變形構(gòu)造帶中活動的金屬元素,然后在還原條件和低溫環(huán)境中沉淀成礦,成礦類型厘定為構(gòu)造-流體制約的變質(zhì)型礦床。
[Abstract]:The Dahegou antimony deposit is distributed in metamorphic rocks of Qinling Group in the Middle Proterozoic. The orebody is controlled by Shuanghuashu deep fault and its adjacent faults. It is a low temperature hydrothermal deposit with obvious structural ore-controlling factors. In order to explore the organic relation between metallogenic structure and ore-forming element enrichment and its metallogenic mechanism, the characteristics of tectonite and the main trace elements of ore and ore mineralogy were selected. Isotopic geochemistry and inclusion testing. The results show that the distribution of the deposit is controlled by the regional ductile shear zone, and the mylonization time of the surrounding rock of the orebody is 198.6 "4.74 Ma.The ore deposit has the property of ore-forming element source bed. Stibnite may be formed in a single environment and closed conditions with unique peak crystal characteristics of stibnite containing high As,Au,Ag,Mo,Hg,Pb and Zn elements and C-O isotopes of calcite minerals belong to magma mantle source. The range of sulfur isotopes of stibnite is between 1.8 鈥，

本文編號：2415126