STUDY ON THE FAULT SYSTEM OF HEBAOSHAN-CHANGXING VEIN GOLD DEPOSITS IN TAINING COUNTY, FUJIAN PROVINCE
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摘要:
以何宝山和长兴脉状金矿床为研究对象，意在找到多级断裂构造与成矿关联，解决制约本区深部及外围找矿难题.基于矿田构造调研和室内多元信息研究分析，总结了控矿构造框架中多级断裂对不同规模成矿单元的控矿特征，建立了构造格架.主要成果如下：1）坳上-南溪及叶家断裂，为矿分布区控岩控矿构造，控制矿田的空间展布；2）朱溪、大马圩断裂，为何宝山矿田控岩控矿构造，控制矿床的空间分布；3）北东向、北西向断裂，为主要的控矿（导矿）断裂，属成矿期构造，控制矿带产出位置；4）北东东、北西向断裂，属成矿期赋矿断裂，控制矿体产出；5）朱溪、大马圩断裂为脉状金矿床边界断裂，外围成矿规模及品位锐减；6）矿体受加里东期侵入岩接触带和北东东、北西向构造控制明显，在断裂构造复合部位、不同岩性接触部位和产状变化明显处，均可能是成矿有利部位可做为找矿构造标志.
Abstract: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.
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Key words:
- vein gold deposit /
- tectonic framework /
- ore-controlling structure /
- multiple phase /
- Fujian Province
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