胶东谢家沟金矿岩石地球化学及流体包裹体研究

GEOCHEMICAL CHARACTERISTICS AND FLUID INCLUSION IN THE XIEJIAGOU GOLD DEPOSIT,JIAODONG AREA

文章对谢家沟金矿进行了详细的地质学、岩石地球化学及流体包裹体研究。微量元素研究表明,谢家沟金矿控矿的主因子组合F1为:Au、Ag、As、Bi、Cu、Pb、Mo、Sb、Co、Ni、Mn,其贡献百分比占65.691%,为主成矿作用所致,形成了该区的韧性剪切带型金矿;通过对流体包裹体的研究得知,谢家沟金矿形成于深成、中低温的成矿环境,其成矿温度为270℃~330℃,成矿压力为3100×105Pa,约在地下11km深处;最后,结合胶东地区所处的区域地质背景及其演化,认为谢家沟金矿形成于碰撞造山晚期的伸展构造环境。胶东地区主断裂带剪切应力场大小和方向的不断调整在研究区产生了剪切应力场,是控制谢家沟矿化的主要构造。

Detailed researches on geology, geochemistry and fluid inclusion are taken for Xiejiagou gold deposit. Research on trace elements shows that the major factor F1 in the Xiejiagou gold deposit is Au, Ag, As, Bi, Cu, Pb, Mo, Sb, Co, Ni, Mn, and its distribution is 65. 691%, which is the result of the main mineralization. Fluid inclusion data shows that Xiejiagou gold deposit was formed in the deep environment and middle to low tempera- ture. Metallogenetic temperature is from 270~C to 330~C and metallogenetic pressure is 3100 x 10SPa. Considering regional geological setting and its evolvement, it is suggested that Xiejiagou gold deposit was formed in an extensional tectonic environment during the late pent^l of plate collision. The sheering stress field, formed by the adjustment of intention and direction of the main faults in the Jiaodong area, is the dominant ore - controlling structure in the Xiejiagou gold deposit.