黑龙江省金厂金矿石英闪长玢岩固结温压条件及其深部预测

SOLIDFIED CONDITIONS OF QUARTZ-DIORITE PORPHYRITES IN THE JINCHANG GOLD DEPOSIT,HEILONGJIANG,NORTHEAST CHINA:IMPLICATION FOR GOLD PROSPECTIVE EXPLORATION

黑龙江东宁县金厂金矿位于兴蒙造山带松嫩地块之东端,是吉黑岩浆成矿域的重要组成部分。其围岩蚀变和流体包裹体研究均显示具典型斑岩Au-Cu矿体特征,与燕山晚期花岗斑岩、石英闪长玢岩密切相关。通过矿物温压计对矿区中部18号矿体下部出露的石英闪长玢岩固结温压条件进行分析表明,岩体固结温度约735℃～700℃,压力约0.63MPa～1.3MPa,侵位深度大致约2km～4km,与流体包裹体获得的成矿深度(2.1km～3.2km)接近。研究结果显示目前出露的矿体属于斑岩矿床成矿体系的中部,而深部斑岩体仍未大规模出露。因此,该矿区深部仍有很大的找矿潜力。

The Jinchang gold deposit is located in the eastern part of the Songnen Block of Xing- meng orogenic belt. It is indicated that, from the country rock alteration patterns and fluid inclu- sions data, the deposit is a porphyry-style gold deposit. Geological and geochronological data re- veal that gold mineralization is most likely to be related to the Yanshanian porphyrytic mag- matism. In order to shed light on the prospective exploration of the gold deposit, mineral geother- mobarometers are used to study the forming conditions of the quartz diorite porphyrites under- neath the No. 18 ore body. It is showed that the solidified temperatures of the quartz diorite por- phyrites are 700 ~C ~735 ~C ,pressures are 0. 63 MPa-1.3 MPa,with the corresponding depths of 2 km-4 km,similar to the mineralization depth （2.1 km-3.2 km）. Based on the characteristics of the porphyry metallogenic system,it is considered that the Jincharrg gold mine still have great potential prospection for further exploration.