STUDY ON THE FAULT SYSTEM OF HEBAOSHAN-CHANGXING VEIN GOLD DEPOSITS IN TAINING COUNTY, FUJIAN PROVINCE

Taking Hebaoshan-Changxing vein gold deposits as the study object, the paper aims to find the relation between multi-order fault structures and mineralization and solve the problems restricting the deep and periphery prospecting in the area. The ore-controlling characteristics of multi-order faults on different scales of metallogenic units are summarized and the tectonic framework is established on the basis of orefield structure survey and indoor multivariate information analysis. The main results are as follows: Aoshang-Nanxi and Yejia faults, as the rock- and ore-controlling structures in the orefield distribution area, control the spatial distribution of orefield. Zhuxi and Damaxu faults are the rock- and ore-controlling structures in Hebaoshan orefield to control the spatial distribution of deposit. The NE- and NW-trending faults are the major ore-controlling/conducting faults, belonging to metallogenic structure and controlling the location of ore belt. The NEE- and NW-trending ore-host faults of the metallogenic period control the orebody occurrence. Zhuxi and Damaxu faults are the boundary faults of the vein gold deposit, beyond which the metallogenic scale and grade drop down sharply. The orebody is obviously controlled by the contact zone of Caledonian intrusive rocks, NEE- and NW-trending structures. The composite of faults, lithological contact and position with obvious occurrence change are all potential mineralization sites and structural indicators for prospecting.