The Ore-controlling Structure And The Ore-forming Characteristics Of Laocaogou Pb-Zn Deposit,Hongya,Sichuan

Laocaogou Pb-Cu deposit located in the Yangtze plantform(Ⅱ),the upper Yangtze syneclise(Ⅱ),Emei Shan fault arch(Ⅲ),Wa Shan faulted dome(Ⅳ),the eastern edge of the north of the mine area is Kangdian axis, belong to the south east of Sanjiang metallogenic.The study area located between three linear structure-metallogenic belt which pass through deep and large fault,from the west to the east they are: Hanyuan-Ebian-Shimian-Yuexi-Huili metallogenic belt, Ganluo-Bushi-Ningnan metallogenic belt,Hongya-Ebian-Mabian-Leibo metallogenic belt. The study area located in Shimian-Hongya metallogenic belt which located in the north of the three metallogenic belt. In the study area Zbdn and ?1m are important ore-storage stratums.In the area abnormal element assemblage are Ag、Pb、Zn、Hg、P、Cd、Mn.,which show low temperature hydrothermal geochemistry feature, the interlinked occurrente of Pb、Zn、Ag show content is high,steep gradient, centralized concentrations.In the area Pb-Zn deposit are widely distributed, we have found Baishahe、Heiqu、Tangjia、Tuanbaoshan etc, more than 20 Pb-Zn deposit or mineral occurrence, there are two main metallogenic type, Pb-Zn deposit occurred in the tectonic fracture of Zbdn,and occurred in the interlaminar fracture of ?1m.Jinning-Chengjiang geological movement form a north-south Chuandian tectonic zone, and west-east Shimian-Ebian, Huili-Ningnan coat long fold belt, which control the form the old paleo sea basin and material sources, constrain the metarial sources come fome basis der verwitterung und denudation in sinian, then formed the north-south, eastward dicke erreicht hundred to thousand meter Zbdn and ?1m reich an algen、magnesim、kiesel dolomit mineralisierten schicht.Regional tectonic of study area is special, it located in the junction of Kangdian axis and Longmenshan overthrust structure, and affected by the Longmenshan overthrust structure, which bring out this area tectonic very complicated. Show out in the middle as the boundary Tuanbaoshan-Honghua-Wusihe, in the west fault and layer towards to NW; in the east fault and layer towards to NE. Which cause Pb、Zn geophysical anomaly and geochemical anomaly, the Pb、Zn deposit is refomed,which have the same shape with the fault and layer,show out the fault and tectonic contol the deposit.This text main through analysis the preserved position、movement of bearing fluid 、enrichment regulation of Pb-Zn deposit, which show out the near north-south fault is the metallogenic activity tectonic systerm, the north-south tectonic systerm is the main geology structure of Laocaogou Pb-Zn deposit. The near north-south extusion pressure control the direction and space distribution of the ore-controlling structure, and control the rise、dirction of motion and route of the ore bearing hydrothermal solution.In Laocaogou deposit when the near north-south fault area intersect with the near north-south interlayer fracture zone,the ore bearing hydrothermal solution along the near north-south fault to move, at last enrichment and mineralization in the interlayer fracture zone. Because of the various combinations of near north-south fault with interlayer fracture zone, which cause the difference character of enrichment and morphological character of deposit. Show out near north-south fault and interlayer fracture zone owner-menber relationship, ore-storage charactor.This text summarizes the deposit ore-forming and Ore-controlling structure of Laocaogou Pb-Zn deposit. Generaly find out the geological characteristics of the deposit and the ore-controlling structure of the deposit, provide some theory to nest work in this area.