本文選題：浩布高礦床　切入點(diǎn)：矽卡巖型礦床　出處：《中國地質(zhì)大學(xué)(北京)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：浩布高鉛鋅銅礦床位于內(nèi)蒙赤峰的北部,得天獨(dú)厚的地質(zhì)構(gòu)造背景使得本區(qū)擁有優(yōu)異的成礦條件。通過對(duì)浩布高礦區(qū)的區(qū)域地質(zhì)和礦床地質(zhì)特征研究,結(jié)合巖石、礦床地球化學(xué)特征進(jìn)行分析總結(jié),本文主要取得了以下認(rèn)識(shí):(1)梳理了浩布高鉛鋅銅礦的控礦因素,包括控礦構(gòu)造、賦礦地層和空間以及礦石特征。得出浩布高礦區(qū)的主要控礦構(gòu)造是廣泛分布在礦區(qū)的一系列NE向斷裂構(gòu)造,為成礦期構(gòu)造;礦體主要賦存于中酸性侵入巖與大石寨組大理巖的接觸形成的矽卡巖帶上及其附近;常見的礦石結(jié)構(gòu)有自形、半自形結(jié)晶結(jié)構(gòu)、固溶體分離結(jié)構(gòu)和交代結(jié)構(gòu)等;構(gòu)造以脈狀、細(xì)脈狀填充構(gòu)造為主,浸染狀構(gòu)造和條帶狀構(gòu)造也比較常見。(2)通過對(duì)浩布高采集樣品的硫同位素測(cè)試數(shù)據(jù)分析,分析樣品礦物硫化物的δ~(34)S值表現(xiàn)出塔式分布的特點(diǎn),表明S同位素在成礦作用過程中基本處于一種分餾平衡的狀態(tài);樣品中δ~(34)S值最低位-5‰,最高為0.6‰;平均值為-1.48‰,表現(xiàn)出幔源硫的特征,且其來源單一,主要來自地幔深部的巖漿。(3)浩布高鉛鋅銅礦床鉛同位素組成特征的μ值和ω值較低,這表明礦石鉛可能來源于富釷虧鈾的源區(qū),總體上表現(xiàn)出上地幔物質(zhì)來源特征且在巖漿侵入時(shí)混染了部分地殼的物質(zhì)。通過對(duì)比分析代表成巖物質(zhì)來源的鉀長石Pb同位素組成特征發(fā)現(xiàn),浩布高礦床礦區(qū)成巖物質(zhì)和成礦物質(zhì)的來源可能相同,他們均來自造山帶和地幔物質(zhì)。(4)H-O同位素分析表明,浩布高礦床礦區(qū)的成礦熱液有巖漿氣水熱液和大氣降水兩個(gè)來源,礦區(qū)成礦熱液在前期主要為巖漿氣水熱液,到后期大氣降水則逐漸轉(zhuǎn)變成為成礦熱液的主要來源。(5)成礦規(guī)律研究表明,浩布高礦床的形成受到地層、構(gòu)造和巖漿巖等多方面因素的綜合制約。表現(xiàn)為有利的地層下受到含礦的巖漿氣水熱液通過滲透交代作用在有利的部位(大理巖的層間斷裂或軸部的虛脫部位)聚集成礦。浩布高礦床的找礦預(yù)測(cè)模式有助于礦區(qū)找礦工作的部署,在北東向構(gòu)造帶內(nèi)尋找多金屬礦產(chǎn)前景較好。
[Abstract]:The Haobugao lead-zinc copper deposit is located in the northern part of Chifeng, Inner Mongolia. The unique geological tectonic background makes the area have excellent metallogenic conditions. The geochemical characteristics of the deposit are analyzed and summarized. In this paper, the following understanding is obtained: 1) the ore-controlling factors, including the ore-controlling structure, of the Haobugao lead-zinc copper deposit are combed. It is concluded that the main ore-controlling structures in Haobugao mining area are a series of NE-trending fault structures widely distributed in the ore area, which are metallogenic structures. The ore bodies mainly occur in the skarn belt formed by the contact between the intermediate-acid intrusive rocks and the marble of Dashizhai formation, the common ore structures are self-shaped, semi-automorphic, solid-solution and metasomorphic, etc. Based on the analysis of the sulfur isotopic data of the samples collected from Haobugao, it is found that the 未 ~ (34) S value of the mineral sulfides of the samples shows the characteristics of tower distribution. The results show that the S isotope is basically in a fractionation equilibrium state during mineralization, the lowest value of 未 ~ (34) S in the sample is -5 鈥，

本文編號(hào)：1644987