本文選題：金廠金礦　切入點：流體包裹體　出處：《中國地質(zhì)大學(xué)(北京)》2017年碩士論文

【摘要】：黑龍江金廠金礦床位于元古界太平嶺隆起與中生代老黑山斷陷的交接部位,屬于興凱湖地塊南段。該區(qū)南鄰華北板塊北緣,北鄰佳木斯、興凱地塊,位于中亞—蒙古構(gòu)造域和濱西太平洋構(gòu)造域交接復(fù)合區(qū)段。本文在金廠金礦床已有地質(zhì)資料收集整理、野外調(diào)研及室內(nèi)分析測試等基礎(chǔ)上,總結(jié)區(qū)域地質(zhì)背景和礦體特征,研究了金廠金礦床的流體包裹體特征、同位素特征,分析了礦床成因;并通過物化遙綜合分析,總結(jié)找礦標志,獲得以下主要認識:本文將礦區(qū)內(nèi)礦體分為兩類:早期的角礫巖型礦體及晚期的裂隙充填脈型礦體。其中,角礫巖型礦體在礦區(qū)內(nèi)分布較多,包括侵入角礫巖型和坍塌角礫巖型,受北西向斷裂控制,在北西向呈串珠產(chǎn)出;裂隙充填型礦體分為環(huán)狀蝕變巖型、巖漿穹隆型及放射狀裂隙充填型礦體,主要集中在半截溝一帶,受深部巖漿上侵和塌陷影響形成的環(huán)狀斷裂、放射狀裂隙構(gòu)造。對于角礫巖型礦體,其流體包裹體類型主要是純氣相、氣液兩相、含子礦物流體包裹體,且J-0、J-11溫度最高,J-1溫度較低,J-9居中,認為含礦熱液以兩個巖體為起始中心,沿北東向J-0至J-1和北西向J-11至J-1運移,最終形成各礦(化)體。裂隙充填型礦體的流體包裹體以氣液兩相及含子礦物流體包裹體為主,Ⅱ號礦體、Ⅲ號脈群及18號礦體成礦溫度相近,其中Ⅱ號礦體溫度稍高,認為流體從深到淺的順序為環(huán)狀蝕變巖型至裂隙充填脈型。通過氫氧同位素數(shù)據(jù)分析,確定了角礫巖型礦體的流體來源主要是巖漿水,裂隙充填脈型礦體的流體以巖漿水和后期改造水為主。對比δ34SV-CDT(‰)值,裂隙充填脈型礦體中II號礦體稍偏高,18號礦體略偏低;角礫巖型礦體的δ34SV-CDT(‰)值分布較集中,多在2‰~4‰。兩類礦體的δ34SV-CDT(‰)值略有不同,但都具有深源硫特征。對比206Pb/204Pb值J-1J-0Ⅱ號礦體;207Pb/204Pb值J-IⅡ號礦體J-0礦體;208Pb/204Pb值J-0J-1礦體Ⅱ號礦體。兩類礦體Pb同位素演化稍有不同,但是差別不大,鉛同位素數(shù)值兼具地幔鉛與造山帶鉛的雙重特征,成礦物質(zhì)主要來源于地幔并有不同程度的地殼物質(zhì)加入。角礫巖型礦體的找礦標志主要為線性構(gòu)造的交匯的薄弱部位,以及硅化、黃鐵礦化、黃銅礦化等礦化蝕變組合;裂隙充填脈型礦體以環(huán)形構(gòu)造、放射狀斷裂,及硅化、黃鐵礦化、絹云母化、高嶺土化為重要的找礦標志。另外,礦區(qū)整體以不同巖性、巖相界線的構(gòu)造薄弱界面,及含子晶、子礦物包裹體和熔融包裹體、高溫、高鹽度包裹體的出現(xiàn),表現(xiàn)為金、銅較富集的找礦標志。
[Abstract]:The Jinchang gold deposit in Heilongjiang is located at the junction of the Proterozoic Taiping Ling uplift and the Mesozoic Laoheishan fault depression, and belongs to the southern section of the Xingkai Lake block, which is adjacent to the northern margin of the North China plate to the south, Jiamusi to the north, and Xingkai block to the north. This paper summarizes the regional geological background and orebody characteristics on the basis of geological data collection, field investigation and laboratory analysis and testing of the Jinchang gold deposit. The characteristics of fluid inclusions and isotopic compositions of the Jinchang gold deposit are studied, and the genesis of the deposit is analyzed. The main conclusions are as follows: in this paper, the orebodies in the mining area are divided into two types: the early breccia orebodies and the late fissure-filled vein orebodies, in which the breccia orebodies are more distributed in the mining areas. Including intrusive breccia type and collapse breccia type, controlled by NW fault and produced in NW direction, fissure filling orebodies are divided into annular altered rock type, magmatic dome type and radial fissure filling type orebody. It is mainly concentrated in the area of Banjiagou, which is formed by deep magmatic intrusion and collapse. For breccia type orebodies, the fluid inclusions are mainly pure gas phase and gas-liquid two-phase. The fluid inclusions containing sub-minerals, and the highest temperature of J-0 ~ (-11) and the lower temperature of J ~ (-1) are considered as the center of the hydrothermal fluid. It is considered that the hydrothermal solution of ore-bearing body is centered on two rock masses, and migrates from J-0 to J-1 and J-11 to J-1 from NW to J-1. The fluid inclusions of fissure-filled orebodies are mainly gas-liquid two-phase and submineral fluid inclusions, and the ore-forming temperatures of No. 鈪，

本文編號：1683037