本文選題：成礦流體 + 流體包裹體��； 參考：《貴州大學(xué)》2015年碩士論文

【摘要】：九星鐵礦床位于貴州省從江九星地區(qū),其大地構(gòu)造位置為江南古陸西南緣,即位于揚子地臺和華南褶皺帶之間的過渡帶,區(qū)域構(gòu)造上歷經(jīng)了武陵期、加里東期、印支期、燕山期、喜馬拉雅期多期次構(gòu)造運動。區(qū)域上出露的地層主要為新元古界四堡巖群文通巖組(Pt3w)、唐柳巖組(Pt3t)以及新元古界青白口系下江群甲路組(Qbj)、烏葉組(Qbw)、番召組(Qbf)。本文在前人的研究基礎(chǔ)之上,對九星鐵礦床開展了較系統(tǒng)的礦床地質(zhì)和成礦流體地球化學(xué)研究,獲得了成礦流體性質(zhì)和來源特征,并探討成礦流體在九星鐵礦床的形成過程中的作用和意義。取得了如下主要成果:(1)成礦具有多期次作用特點,主要可分為區(qū)域變質(zhì)成礦期、熱液成礦期和表生成礦期。(2)熱液成礦期石英流體包裹體巖相學(xué)觀察,富液體包裹體最為發(fā)育,主要為NaCl-H2O溶液。(3)流體包裹體測溫學(xué)表明,成礦流體鹽度為0.71~21.61wt%(NaCl eqv),均值為13.40wt%(NaCl eqv),是中等鹽度流體;均一溫度為108~383℃,均值為220℃,是中溫流體;成礦壓力為8.9~46.9MPa,均值為24.37MPa;成礦深度為0.35~1.56Km,均值為0.90Km,是淺成成礦深度。(4)單個流體包裹體成分的激光拉曼光譜原位成分分析表明,包裹體液相成分主要是H2O,其次是N2和CO2,氣相成分主要是H2O、N2和CO2。(5)成礦流體H同位素組成為水為-101.5~-89.0‰。石英中O同位素石英為10.2~10.8‰,經(jīng)過計算得出流體O同位素組成水為-1.16~1.24‰,均值為-0.18‰。H-O同位素組成特征表明,氧具有漂移特征,表明流體多來源特征。綜上所述,九星鐵礦床流體的成礦作用機制較為復(fù)雜,礦體是在有利的區(qū)域變質(zhì)作用、地層、巖性、構(gòu)造條件下,流體對成礦物質(zhì)的活化、轉(zhuǎn)移并在適宜成礦環(huán)境富集沉淀而形成。
[Abstract]:The Jiuxing iron deposit is located in the Jiangjiuxing area, Guizhou Province. Its tectonic location is the southwestern margin of the Yangtze ancient land, that is, the transitional zone between the Yangtze platform and the South China fold belt. The regional structure has gone through the Wuling, Caledonian and Indosinian periods. Yanshanian period, Himalayan stage multiple times tectonic movement. The strata exposed in the region are mainly composed of Pt3WN and Pt3t of the Neoproterozoic Sibao Group, and the Lower Jiangqun Group of the Neoproterozoic Qingbakou formation, the Lower Jiangqun Road formation of the Neoproterozoic, the Wuye formation and the Panzhao formation. Based on the previous studies, a systematic study of ore deposit geology and ore-forming fluid geochemistry has been carried out in this paper, and the ore-forming fluid properties and source characteristics have been obtained. The role and significance of ore-forming fluid in the formation of Jiuxing iron deposit are also discussed. The main results obtained are as follows: the ore-forming stage has the characteristics of multiple stages, which can be divided into regional metamorphic metallogenic period, hydrothermal metallogenic stage and epigenetic ore forming stage. (2) the petrographic observation of quartz fluid inclusions in hydrothermal metallogenic period shows that liquid rich inclusions are the most developed. The temperature measurement of fluid inclusions mainly in NaCl-H2O solution shows that the salinity of ore-forming fluid is 0.71~21.61wt%(NaCl eqvn, the mean value is 13.40wt%(NaCl eqvn, which is medium salinity fluid, the homogenization temperature is 108 ~ 383 鈩，

本文編號：1977140