本文選題：礦田構造 + 流體包裹體��； 參考：《廣西大學》2015年碩士論文

【摘要】：五圩礦田位于桂西北丹池成礦帶南東段,是一個以鉛、鋅、銻、銀、汞、砷等一套中低溫元素成礦為主的多金屬礦田,區(qū)內主要礦床(點)有箭豬坡鉛鋅銻多金屬礦(大型)、三排洞鉛鋅銻多金屬礦(中型)、塘志-坡平鉛鋅銻多金屬礦(中型)、芙蓉廠鉛鋅銻礦(中型)、水落砷鉬汞多金屬礦(中型)、拔旺銻礦點和橋凳-九瓦汞礦點等。本文主要針對五圩礦田開展了礦田構造、礦物學特征、流體包裹體和礦床地球化學等的研究,在此基礎上,總結了礦田的成礦分帶特征,提出了今后找礦方向。取得的主要成果和認識有：(1)礦田內主要構造為NNW向五圩背斜和NNW向斷裂。五圩背斜為一軸向NNW的復式短軸背斜,由兩個次級背斜組成。背斜兩翼不對稱,東翼緩(20～50°)、西翼陡(60～85°),沿軸向呈“S型”拐彎,拐彎部位呈NW向。NNW向斷裂為礦田內主要斷裂構造,也是區(qū)內主要控礦構造。該組斷裂經歷了兩期活動,早期以擠壓為主兼具順時針(右旋)扭動,晚期以張性為主兼具逆時針(左旋)扭動,由于早期斷裂活動強烈,晚期構造活動僅在局部疊加,因此,斷裂總體表現(xiàn)出壓扭性特征。(2)通過對五圩礦田內主要礦床(點)的礦物學特征、流體包裹體、元素地球化學特征等研究,發(fā)現(xiàn)礦田內各礦床(點)的礦物粒徑、礦物顏色、成礦溫度和成礦元素特征比值等存在規(guī)律性變化,可劃分為三個成礦帶,即中低溫成礦帶(Ⅰ)、中溫成礦帶(Ⅱ)和中高溫成礦帶(Ⅲ)。由Ⅰ→Ⅱ→Ⅲ成礦帶閃鋅礦和輝銻礦的礦物粒徑逐漸增大,閃鋅礦顏色逐漸加深；成礦溫度由低到高(145～249℃→220-265℃→245-322℃);(Hg+As)/(Zn+Pb)和(Hg+As)/Zn等特征比值均出現(xiàn)較明顯遞減,即低溫礦物元素的富集呈遞減趨勢,而高溫礦物元素富集則呈遞增趨勢。(3)依據(jù)成礦分帶特征結合地球物理資料認為,礦田中部的箭豬坡礦區(qū)是五圩礦田的成礦中心和隱伏巖體可能的產出部位,箭豬坡礦床的深邊部尤其是NNW向背斜的拐彎部位是成礦最有利地段和今后的找礦遠景區(qū)。(4)由成礦期共軛節(jié)理所求得的交線產狀和主成礦階段斷裂面上的擦痕、階步所指示的運動方向推測,箭豬坡礦床成礦熱液可能來自NE方向,脈狀礦體向NE側伏,由此認為箭豬坡礦床NE方向的深部是尋找脈狀礦體有利部位。(5)本次調查在箭豬坡礦床310斜井壁(NNW向五圩背斜拐彎處)新發(fā)現(xiàn)有厚約7m的緩傾斜似層狀Sn-Pb-Zn-Sb礦體,其與大廠錫礦的似層狀礦體相類似,進一步證實了本研究認識的客觀性。
[Abstract]:The Wuxu ore field is located in the eastern section of the Danchi metallogenic belt in northwest Guangxi. It is a polymetallic ore field dominated by lead, zinc, antimony, silver, mercury, arsenic and so on. The main deposits (points) in this area are Qianzhoupo lead-zinc antimony polymetallic ore (large scale, Sanpaitong Pb-Zn antimony polymetallic ore) (medium-sized, Tangzhi-Puping lead-zinc antimony polymetallic ore) (medium scale, Furongchang lead, zinc and antimony ore, medium size, water arsenic and molybdenum mercury ore). Polymetallic ores (medium-sized, Bawang antimony and Qiaoben- Nine Watt mercury ore sites, etc. Based on the study of the structure, mineralogical characteristics, fluid inclusions and deposit geochemistry of the Wuwei ore field, this paper summarizes the ore-forming zonation characteristics of the ore field and puts forward the prospecting direction in the future. The main structures in the ore field are NNW anticline and NNW fault. Wuxu anticline is a compound short axis anticline with an axial NNW, which is composed of two secondary anticlines. The two wings of the anticline are asymmetrical, the east wing is 20 ~ (50) 擄/ m, and the west wing is 60 ~ 85 擄/ m. Along the axis of the anticline is a "S" bend, and the bend is NW. NNW trending fault is the main fault structure in the ore field and is also the main ore-controlling structure in the area. This group of faults experienced two stages of activity. In the early stage, the compression was mainly accompanied by clockwise (dextral) twisting, and in the late stage it was mainly tensional and counterclockwise (left-handed). Due to the strong early fault activity, the late tectonic activity was only superimposed locally, so, By studying the mineralogical characteristics, fluid inclusions and element geochemistry of the main deposits (points) in Wuwei ore field, it is found that the mineral particle size and mineral color of each ore deposit (spot) in the ore field. There are regular changes in metallogenic temperature and metallogenic element characteristic ratio, which can be divided into three metallogenic belts, I. e. Middle and low temperature metallogenic belts (鈪，

本文編號：1878728