黑龙江省争光金矿矿床模型
发布时间：2018-10-13 12:13
【摘要】：争光金矿位于大兴安岭东北部地区,是多宝山矿集区内重要的金矿床。目前,金的储量已达30吨以上,平均品位为3.49克/吨,达到大型金矿床的规模。由于争光金矿目前研究程度非常低,所以本文从岩矿相学、元素地球化学、同位素以及年代学四方面对其进行系统地研究,并进一步建立矿床模型。主要的研究成果包括:(1)矿石中金的存在形式主要为银金矿和含金碲银矿,金矿物通常赋存在黄铁矿的裂隙中,或者处于石英与方铅矿的接触面上。含金矿物通常与黄铜矿、闪锌矿和方铅矿共生在一起。除金之外,部分矿石中Cu、Pb、Zn也达边界品位,可加以综合利用。(2)发现了低硫型浅成低温热液型矿床标志矿物冰长石和富铁闪锌矿。且矿石中石英和方解石具有典型的梳状构造,H-O同位素表明其流体组成具低硫型特征,多方面因素共同证实争光为低硫型浅成低温热液型矿床。(3)H-O同位素(δ18O水=-3.2‰~-1.0‰,δD水=-113.5‰~-119.8‰)研究显示成矿流体主要为大气水,含有少量岩浆水的参与。C-O同位素(δ13CPDB=-4.06‰~-1.60‰,δ18OSMOW=6.30‰~14.65‰)研究表明成矿流体中的C源于岩浆,并具低温蚀变的特征。Si-O同位素(δ30Si=-1.0‰~0.3‰,δ18O石英=10.9‰~13.6‰)显示石英中Si为岩浆来源,并显示其为热液成因。S同位素(δ34S主要为-5.4‰~-1.5‰,另有两个异常值-12.1‰和-8.9‰)显示成矿流体S主要来源于岩浆。(4)奥陶纪的多宝山组和闪长岩类具有下地壳来源的特征,而侏罗纪闪长岩具有中上地壳来源的特征。Lu-Hf同位素分析显示奥陶纪闪长岩类具有幔源特征(其εHf(t)=+11.94~+15.63),侏罗纪闪长岩类具有壳源特征并有少量幔源物质的参与(εHf(t)=-11.76~-1.00)。而矿石的稀土和微量元素特征显示多宝山组可能为主要的矿源层。(5)争光金矿经历了三次成矿作用。属于奥陶纪多宝山斑岩成矿系统的斑岩型和浅成低温热液型成矿作用(成矿年龄约460 Ma~480 Ma);侏罗纪早期古太平洋和蒙古-鄂霍茨克洋的俯冲造成了板内伸展背景下的浅成低温热液型成矿作用(成矿年龄为184.6±2.6 Ma);以及侏罗纪晚期蒙古-鄂霍茨克洋闭合导致的伸展作用及岩石圈拆沉背景下的浅成低温热液型成矿作用(成矿年龄为150.67±0.77 Ma)。
[Abstract]:Zhengguang gold deposit is an important gold deposit in Dobaoshan ore concentration area, located in the northeast of Daxinganling. At present, the gold reserves have reached more than 30 tons and the average grade is 3.49 g / t, reaching the scale of large gold deposit. Due to the very low degree of study of Gengguang Gold Mine at present, this paper systematically studies the gold deposit from four aspects of petrology, elemental geochemistry, isotope and geochronology, and further establishes the ore deposit model. The main results are as follows: (1) the main forms of gold in ore are silver gold deposit and gold tellurium silver deposit, which usually occurs in the fissure of pyrite or on the contact surface between quartz and galena. Gold-bearing minerals are usually associated with chalcopyrite, sphalerite and galena. In addition to gold, Cu,Pb,Zn also reaches boundary grade in some ores, which can be comprehensively utilized. (2) the low sulfur epithermal hydrothermal type deposits have been found to mark the mineral ice feldspar and marmatite rich in sphalerite. Quartz and calcite in ore have typical comb-like structure, H-O isotopes show that their fluid composition is of low sulfur type. It is confirmed by many factors that Gengguang is a low-sulfur epithermal hydrothermal deposit. (3) the study of H-O isotope (未 18O water = -3.2 鈥，
本文编号：2268581
[Abstract]:Zhengguang gold deposit is an important gold deposit in Dobaoshan ore concentration area, located in the northeast of Daxinganling. At present, the gold reserves have reached more than 30 tons and the average grade is 3.49 g / t, reaching the scale of large gold deposit. Due to the very low degree of study of Gengguang Gold Mine at present, this paper systematically studies the gold deposit from four aspects of petrology, elemental geochemistry, isotope and geochronology, and further establishes the ore deposit model. The main results are as follows: (1) the main forms of gold in ore are silver gold deposit and gold tellurium silver deposit, which usually occurs in the fissure of pyrite or on the contact surface between quartz and galena. Gold-bearing minerals are usually associated with chalcopyrite, sphalerite and galena. In addition to gold, Cu,Pb,Zn also reaches boundary grade in some ores, which can be comprehensively utilized. (2) the low sulfur epithermal hydrothermal type deposits have been found to mark the mineral ice feldspar and marmatite rich in sphalerite. Quartz and calcite in ore have typical comb-like structure, H-O isotopes show that their fluid composition is of low sulfur type. It is confirmed by many factors that Gengguang is a low-sulfur epithermal hydrothermal deposit. (3) the study of H-O isotope (未 18O water = -3.2 鈥，
本文编号：2268581
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