论文部分内容阅读
抱伦金矿床是海南省新近发现的大型金矿床之一,属于发育于下志留统陀烈组浅变质岩系中受断裂构造裂隙控制的岩浆热液型金矿床。成矿流体包裹体特征和氢氧同位素研究表明,成矿流体以岩浆水为主,有部分变质水的参与,大气降水影响比较小;成矿元素地球化学背景、硫同位素、稀土元素和初始锶比值等反映成矿物质来源虽然以变质岩为主,但有部分来源于岩浆岩;成矿物质和成矿流体来源反映出成矿作用与岩浆活动的密切关系。由热液蚀变矿物Rb-Sr等时线年龄234Ma和K-Ar年龄213Ma可知,金矿化年龄为210～230Ma,所以,抱伦金矿床的成矿时代为印支期。这一结果与粤西-海南成矿带的成矿时代特征及特提斯构造演化特点相吻合。
The Baolun gold deposit is one of the newly discovered large gold deposits in Hainan Province and belongs to the magmatic hydrothermal gold deposit controlled by the fault structure fissures in the shallow metamorphic series of the Lower Silurian Tuoluo Formation. The characteristics of ore-forming fluid inclusions and hydrogen and oxygen isotopes indicate that the ore-forming fluid is mainly magmatic water with the participation of some metamorphic water and relatively little influence of atmospheric precipitation. The geochemical background of ore-forming elements, sulfur isotopes, rare earth elements and initial strontium The ratios reflect the origin of the metallogenic materials, although mainly metamorphic rocks, but are partly derived from magmatic rocks. The sources of metallogenic materials and ore-forming fluids reflect the close relationship between mineralization and magmatism. According to the Rb-Sr isochron age 234Ma and K-Ar age 213Ma, the gold mineralization age is 210 ~ 230Ma. Therefore, the mineralization age of the Baolun gold deposit is Indosinian. This result is consistent with the characteristics of the metallogenic epoch of the western Guangdong-Hainan metallogenic belt and Tethys tectonic evolution.