本文關(guān)鍵詞： 圍巖蝕變 地球化學(xué) 礦床成因 成礦預(yù)測(cè) 槍馬金礦　出處：《中國(guó)地質(zhì)大學(xué)(北京)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：槍馬金礦是小秦嶺地區(qū)一個(gè)代表性的大型石英脈型金礦。本文對(duì)槍馬金礦開(kāi)展了礦床地質(zhì)、礦床地球化學(xué)及同位素地球化學(xué)研究,在此基礎(chǔ)上分析了圍巖蝕變與金成礦的關(guān)系,探討了槍馬金礦的成因,總結(jié)了成礦規(guī)律,開(kāi)展了成礦預(yù)測(cè)。槍馬金礦主礦體為石英黃鐵礦脈,且空間上具有波狀起伏、尖滅再現(xiàn)的特征。構(gòu)造控礦作用顯著,厚大礦體多賦存在傾向傾角轉(zhuǎn)折部位。槍馬金礦礦體兩側(cè)普遍發(fā)育圍巖蝕變且空間上具有明顯分帶特征。自礦體向外依次發(fā)育黃鐵絹英巖化蝕變、硅化蝕變、堿性交代蝕變、綠泥綠簾石化蝕變和新鮮斜長(zhǎng)角閃巖。以黃鐵絹英巖化蝕變和堿性交代蝕變與礦體關(guān)系最為密切。Isocon圖解法質(zhì)量平衡計(jì)算結(jié)果表明,早期堿性交代蝕變使圍巖中的Au、Cu、Pb、Zn等元素發(fā)生活化進(jìn)入流體;硅化蝕變過(guò)程中流體與圍巖間元素交換緩慢;而黃鐵絹英巖化蝕變過(guò)程中發(fā)生強(qiáng)烈的硫化反應(yīng),破壞了金絡(luò)合物的平衡,導(dǎo)致金的大量沉淀;綠泥綠簾石化蝕變?yōu)槌傻V晚期的低溫蝕變,標(biāo)志著成礦作用的基本結(jié)束。礦石的微量和稀土元素配分模式與堿性交代和黃鐵絹英巖化蝕變巖相似,表明其可能具有相似的成礦物質(zhì)來(lái)源。鉛同位素測(cè)試結(jié)果表明,成礦物質(zhì)主要來(lái)自太華群變質(zhì)巖。綜合分析表明,構(gòu)造對(duì)礦體就位有重要的控制作用,堿性交代和黃鐵絹英巖化蝕變作用是導(dǎo)致金活化和沉淀的重要因素,這兩種蝕變也是重要的找礦標(biāo)志。預(yù)測(cè)59號(hào)勘探線南側(cè)深部具有良好的找礦潛力
[Abstract]:Guanma gold deposit is a representative large quartz vein type gold deposit in Xiaoqinling area. Ore deposit geology, deposit geochemistry and isotopic geochemistry have been studied in this paper. On this basis, the relationship between wall rock alteration and gold mineralization has been analyzed. In this paper, the origin of Guanma gold deposit is discussed, the metallogenic regularity is summarized, and metallogenic prediction is carried out. The main orebody of Qianma gold deposit is quartz pyrite vein, which has the characteristics of wave fluctuation and sharp out reappearance in space. The thick and large ore bodies mainly occur in the inclined angle turning position. The wall rock alteration is generally developed on both sides of the Gangma gold deposit and has obvious zonation characteristics in space. From the ore body out, the alteration of the pyrolite, the silicification and the alkaline metasomatism are developed in turn. Green mud and green curtain alteration and fresh oblique amphibolite. The results of mass balance calculation show that the alteration of yellow sericite and alkaline metasomatism is most closely related to the orebody. In the early alkaline metasomatic alteration, the elements such as Au-CuCuPb-Zn in the surrounding rock were activated into the fluid, the exchange of elements between the fluid and the surrounding rock was slow during the silication alteration, and the strong vulcanization reaction took place in the alteration process of the yellowsericite. The balance of gold complex is destroyed and a large amount of gold is precipitated. The alteration of green mud and green curtain turns into low temperature alteration in late metallogenic period. The trace and rare earth element distribution patterns of ore are similar to alkaline metasomatism and yellow sericite altered rocks, indicating that they may have similar metallogenic sources. The metallogenic material mainly comes from the metamorphic rocks of Taihua Group. The comprehensive analysis shows that the structure plays an important role in controlling the position of the orebody, and the alkaline metasomatism and the alteration of the Huangtianshinite are the important factors leading to the activation and precipitation of gold. These two kinds of alteration are also important indicators for prospecting. It is predicted that the south depth of Prospecting Line 59 has good prospecting potential.
【學(xué)位授予單位】：中國(guó)地質(zhì)大學(xué)(北京)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：P618.51
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本文編號(hào)：1501532