【摘要】：內(nèi)蒙古林西邊家大院鉛鋅銀多金屬礦床是近年新發(fā)現(xiàn)的多金屬礦床,礦區(qū)由三種類(lèi)型礦床組成:西部斑巖鎢-錫-鉬礦床,中部角礫巖型銅-鉛-鋅礦床及東部熱液脈型鉛-鋅-銀礦床。本文通過(guò)對(duì)整個(gè)礦床29個(gè)閃鋅礦樣品進(jìn)行鋅同位素值測(cè)試分析,并結(jié)合前人對(duì)邊家大院鉛鋅銀多金屬礦床地質(zhì)特征、成礦流體的物理性質(zhì)總結(jié),取得如下認(rèn)識(shí):(1)梳理了邊家大院礦床地質(zhì)特征,通過(guò)巖石地球化學(xué)測(cè)試、巖石主微量元素、H-0、C-0同位素等研究了礦床的成礦物質(zhì)來(lái)源。(2)通過(guò)對(duì)邊家大院鉛鋅銀多金屬礦床29塊閃鋅礦研究得出,樣品中鋅同位素的值從西到東呈現(xiàn)增長(zhǎng)趨勢(shì)(+0.17%到+0. 36%),但在角礫巖型礦床中也觀(guān)察到較輕的鋅同位素樣品。系統(tǒng)增長(zhǎng)表明這三個(gè)小礦床應(yīng)來(lái)自于同一個(gè)成礦系統(tǒng),它們?cè)跁r(shí)間和空間上存在一定聯(lián)系;較輕的鋅同位素樣品,可能是成礦之后由于大氣降水引起的淋濾作用而改變了閃鋅礦中鋅同位素的值。(3)利用邊家大院礦床中的鋅同位素值測(cè)試分析,直接揭示出三種類(lèi)型礦床屬于同一個(gè)熱液系統(tǒng),并且之間存在相互聯(lián)系。該礦集區(qū)三類(lèi)礦床形成于太平洋俯沖下陸內(nèi)伸展的構(gòu)造背景,是早白堊世深源巖漿上侵構(gòu)造-巖漿作用的產(chǎn)物。這一研究也為下一步進(jìn)行礦床預(yù)測(cè)、開(kāi)展找礦工作指出了方向。
[Abstract]:The Lead-Zinc-Ag polymetallic deposit in Jiayuan, west of Inner Mongolia, is a newly discovered polymetallic deposit, which is composed of three types of deposits: the western porphyry tungsten-tin molybdenum deposit. The central breccia type copper-lead-zinc deposit and the eastern hydrothermal vein-type lead-zinc-silver deposit. In this paper, 29 sphalerite samples of the whole deposit are tested and analyzed, and the physical properties of ore-forming fluids are summarized according to the geological characteristics of the lead, zinc and silver polymetallic deposits in Bian Jia Yuan. The results are as follows: (1) the geological characteristics of the Bian Jia Yuan deposit are combed, and the rock geochemistry is measured. The source of ore-forming material has been studied by the main trace element of rocks, such as H-0C _ 0 isotopes. (2) through the study of 29 sphalerite deposits in Bian Jia Yuan Pb-Zn Ag polymetallic deposit, it is found that the values of zinc isotopes in the samples show an increasing trend from west to east (0.17% to 0. 7%). But lighter zinc isotopic samples were also observed in breccia deposits. The systematic growth indicates that these three small deposits should come from the same ore-forming system, and they have some relationship in time and space. It is possible that the zinc isotope values in sphalerite have been changed due to the leaching caused by atmospheric precipitation after mineralization. (3) by using the zinc isotopic values of the Bian Jia Yuan deposit, it is directly revealed that the three types of deposits belong to the same hydrothermal system. And there is a correlation between them. The three types of deposits formed in the tectonic setting of the subduction and subcontinental extension in the Pacific Ocean are the product of the early Cretaceous deep source magma transgression tectonic-magmatism. This study also points out the direction for further ore deposit prediction and prospecting.
【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(lèi)號(hào)】：P618.2

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本文編號(hào)：2215722