摘要
浙、赣、皖相邻地区金属矿产分布呈现南钢金北钨锡的特点。十六条主要线性断 裂带和九岭、怀玉地体的拼接带叠复构成区域一级控矿断裂网络，同期不同类型金属矿化围绕 网络结点处的岩体分布组成矿田尺度斑岩成矿体系，两者分别决定和控制了区域范围和矿田范 围金属矿床包括铜、金矿床的空间就位。燕山期强烈的构造岩浆活动伴随有爆发式的金属成矿 作用，铜、金矿化主要与燕山早期Ｉ型中酸性花岗岩类有关。成矿元素部分来自浅部不同地层， 特别是中元古和中一晚元古界含矿岩石建造，也有来自下地壳以至地幔。德兴铜金矿集区的成 矿地质条件和找矿标志组合在区内独一无二，但其周边地区仍然存在中、大型铜、金矿床的找矿 潜力，四个优选的普查靶区有望发展成铜、金勘查基地。利用成矿的断裂网络层次定位思路和 矿田级富铜、金斑岩体系找矿模型在该区进行铜、金预测一普查、有可能收到事半功倍的效果。
The adjacent area of prov. Zhejiang, Jiangxi and Auhui is characterized by the ore distribution pattern-Cu.Au on the South and W. Sn on the North, corresponding to relief changing of the Moho discontinuity. The mesozoic left lateral strike - slip tectonic movement of NNE direction in East Asia Continent and its margin leads to formation of ore - controlling fault network system, which is composed by the newborn NNE trending wrench fault zones and preexisted NE, NW and sublatitudial fault zones. In the studied region, 16 major linear fracture zones of NNE, NE and NW directions with interval of 40 -60km between the parallel ones and the amalgamation suture zone between the Jiuling terrane and Huaiyu terrane construct the first grade regional ore-controlling fault network. Intersections of the major faults determine location o f most industrial Cu. An. W. Sn ore deposits(ore fields) and related intrusive bodies of Yensha- nian period in the region. The highly deformed district(block), where 3 or more direction major linear fault zones intersected with each other and overlaped on the basement amalgamation suture zone might be potential for localization of ore concentration region and super - large ore deposits. The second grade ore - controlling fault network consisting of secondary fault zones with interval of 5 - 6km between themselves controls numerous ore occurences and some small scale ore deposits, as seen in the northwestern part of Zhejiang province. There also exists the local ore controlling fault network in scope of ore field and ore concentration region, that combined with other geologic structure forms control individial ore deposits and ore bodies. Contemporaneous ore mineralization of different types, located around a central porphyry body of I type granitoids at intersecions of the network compose ore field scale PCS. The fault network and PCS determine and controll the emplacement of metal accumulations (among them Cu - An accumulation) in scale of both region and ore field respectively. Intensive Yenshanian tectono-magmatic activities were accompanied by"explosive style"metallic mineralizations. The Cu - An mineralization is affiliated with the Early Yenshanian intermediate to intermediate-acidic granitoids of I type. Ore source is supplied partly by the ore-bearing rock formations of different ages, in particular, of the Middle and Middle-Upper Proterozoic and partly by the lower crust and the mantle. Though the Dexing Cu - An ore concentration district has a most favorable combination of ore - forming conditions and prospecting indicators, which is believed to be unique for the studied region, there still exists the prospecting potential of medium to large scale Cu - An ore deposits in its neiboring area. 4 targets were selected, which in further could be swiched to detail exploration. Using the concept of graded fault network control of ore location and the prospecting model for An - rich PCS might save both time and finance in the future prognosis and prospecting for Cu and An in the region.
出处
《火山地质与矿产》
1999年第3期155-171,共17页
Volcanology & Mineral Resources
关键词
斑岩铜矿体系
断裂网络
找矿潜力
铜矿床
金矿床
porphyry copper system fault network copper & gold potential adjacent area of prov. Zhejiang Jiangxi and Anhui
