老挝琅勃拉邦爬奔金矿构造特征及控矿作用

Structural Characteristics and Ore-controlling Role of Phapon Gold Deposit in Luang Prabang,Laos

爬奔(Phapon)金矿位于中国"三江"成矿带南延琅勃拉邦岛弧带中段,矿体赋存于石炭系—下二叠统海相碳酸盐岩地层中,受构造控制明显。矿石中金属矿物少见,脉石矿物以方解石为主,属于少硫化物型中—低温热液矿床。通过野外地质调查,并结合前人成果,对区域和矿区构造控矿作用进行了系统分析。研究表明,NE向琅勃拉邦断裂带控制着区域构造格架;次级韧—脆性剪切带(F5)控制着区域地层、矿化蚀变及化探异常分带;次级韧性剪切带(F1和F2)控制着赋矿地层及金矿带的分布;衍生构造NNW向张扭断裂控制矿化蚀变分带、金矿体定位及矿体形态,构造交会部位是成矿有利位置。构造是爬奔金区内重要的找矿标志,结合地层、矿化蚀变等标志,有助于指导外围找矿工作。

Phapon gold mine locates in the middle of the Luang Prabang island arc belt, which is the south part of Sanjiang ore cluster area in China.It is controlled by structures and the orebody occurs in the Carboniferous- Lower Permian marine carbonate strata.Rare metal mineral in the ore, and gangue mineral is given priority to with calcite, the deposit is a less sulfide type middle-low temperature hydrothermal deposit.Through field investigation, combining previous research results, we analyse and study the structure characteristics and ore-controlling role of the region and mining area.Researches show that the NW Luang Prabang arc fault controls regional structural framework,the secondary parallel F5 ductile-brittle shear belt controls the distribution of stratigraphic, mineralization and alteration and geochemical anomalies, the secondary syntropy F1 and Fz ductile-brittle shear belt controls the distribution of stratum and gold belt; the derived structure NNW tensional-shear faults controls the mineralization and alteration belting,position and output of gold ore body.Intersections of mineralization structure is advantageous position.As an important structure is used to guide peripheral ore prospecting. symbols,with stratum and mineralization and alteration,