本文關(guān)鍵詞： 金礦床 地質(zhì)特征 流體包裹體 礦床成因 太陽坪　出處：《西南科技大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：太陽坪金礦床位于四川省廣元市,大地構(gòu)造背景處于揚(yáng)子地臺(tái)與摩天嶺褶皺帶中間的茂縣群地體,屬于陽平關(guān)斷裂帶金礦成礦系列。礦區(qū)出露地層以志留系黃坪組為主,為主要容礦圍巖;丁家林-太陽坪韌-脆性剪切斷裂控制了金礦床的分布、形態(tài)和產(chǎn)狀。該礦區(qū)目前已圈定了5個(gè)礦體,均為石英脈狀礦體,沿走向有尖滅再現(xiàn)的特點(diǎn),礦體與圍巖界線清楚。礦體長(zhǎng)245~399m,厚0.68~0.88m,礦體傾向?yàn)?65°~360°、傾角為53°~82°;礦石金屬礦物主要有黃鐵礦、閃鋅礦、黃銅礦、方鉛礦等,脈石礦物主要有石英、絹云母、綠泥石等。礦石結(jié)構(gòu)以自形-半自形粒狀、碎裂、環(huán)狀等結(jié)構(gòu)為主;礦石構(gòu)造主要有浸染狀、條帶狀以及團(tuán)塊狀等。圍巖蝕變有硅化、黃鐵礦化、綠泥石化、絹云母化等,其中硅化和黃鐵礦化與金成礦有密切關(guān)系。黃鐵礦的δ34S值的范圍為5.7~10.2‰,變化較小,說明硫同位素均一化程度高,硫的來源為圍巖;石英礦物中氫、氧同位素分析結(jié)果表明該礦床成礦流體來源以變質(zhì)水為主。流體包裹體研究表明,成礦溫度主要集中于180~279℃之間,屬于中溫范圍;成礦流體具有低鹽度(2.90~8.68 wt%Na Cl)、低密度(0.71~0.97g/cm3)的特征;成礦壓力為39.08~95.25Mpa,成礦深度為4.95~8.04km,具有中深成礦特征。礦床的主要控礦因素為地層和構(gòu)造因素,找礦標(biāo)志主要有構(gòu)造、圍巖蝕變、化探異常及舊采遺跡等標(biāo)志。確定其成因類型為中溫變質(zhì)熱液脈型金礦床,并建立了該礦床的成礦模式。
[Abstract]:The Niangping gold deposit is located in Guangyuan City Sichuan Province and the tectonic setting is located in the Maoxian Group between the Yangtze platform and the Ferris Ridge fold belt. It belongs to the metallogenic series of gold deposits in the Yangpingguan fault zone. The exposed strata of the mining area are dominated by the Silurian Huangping formation, which is the main host rock. The distribution, morphology and occurrence of the gold deposit have been controlled by the ductile-brittle shear fracture of Dingjialin-Sun Ping. At present, five orebodies have been delineated, all of which are quartz vein orebodies, with the characteristics of pinnacle reappearance along the strike. The boundary between the orebody and the surrounding rock is clear. The orebody is 245m long, 0.68m thick 0.88m, the orebody tends to 165 擄~ 360 擄and the inclination angle is 53 擄~ 82 擄; There are mainly pyrite, sphalerite, chalcopyrite, galena and so on. The gangue minerals are mainly quartz, sericite, chlorite and so on. The ore structures are mainly dyed, banded and lumped, etc. The wall rock is altered by silicification, pyrite, greenstone, sericite and so on. Among them, silicification and pyrite are closely related to gold mineralization. The 未 34S value of pyrite ranges from 5. 710. 2 鈥，

本文編號(hào)：1473591