An Analysis of Tectonic Stress Field and Prospecting Direction in the Gaoshan Gold and Silver Deposit, Longquan Area, Zhejiang Province
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摘要: 高山金银矿是遂昌—龙泉地区典型的中低温火山-次火山热液型矿床,断裂控矿特征明显。在野外实地观测和节理测量的基础上,利用区域构造解析法、节理统计分析法、共轭剪节理分析法等,通过吴氏网投图分析和计算机软件处理,厘定了高山金银矿区多期次构造变形特征及其主压应力的转变过程,并根据构造变形交切关系及相应的地层时代证据,推断应力作用的期次和时代。据此,将高山金银矿区的构造应力场划分为6个阶段,包括:成矿前的基底变形期(包括3个阶段),成矿期的早期成矿阶段和晚期成矿阶段,以及成矿后矿体被破坏阶段;并结合矿区目前找矿实际,提出下一步找矿方向应重点向矿区深部勘查,在综合研究确定矿体可能赋存部位的前提下,可以采取少量深部钻探工程验证。Abstract: Located in Suichang–Longquan area, the Gaoshan gold and silver deposit is a typical volcanic-subvolcanic meso-epithermal deposit with its mineralization closely controlled by fault activities. This paper mainly presents field measurements of joints and faults for identifying features of activities and the principal stress direction by using traditional methods in tectonic stress field research. Stages and times of the tectonic stress field are also determined based on deformation and intersection relations with structures and diagenesis ages of strata. The results show that the tectonic stress field in the Gaoshan gold and silver deposit can be divided into six periods. Basement structural deformation occurred before the metallogensis. Ore-controlling fault activities and main mineralization could be divided into two periods, and gold and silver orebodies were locally dislocated by fault activities after the formation of the ore deposit. Present prospecting progress and characteristics of different phases of tectonic activities are additionally discussed; on such a basis, the authors hold that much attention should be attached to the depth in further ore prospecting.
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