Characteristics And Metallogenic Regularity Of Explosive Breccia Type Deposits

With the continuous development of surface mineral resources,deep prospecting has become an imperative trend in the future.Cryptoexplosive breccia is a set of rock types formed by the subtle blasting of magma near the surface.It is often produced in the form of cryptoexplosive breccia.Its porosity is large and provides a good channel for ore-bearing hydrothermal fluids.It is an important type of minerals such as gold,copper,tungsten,molybdenum and uranium.The diagenesis is often accompanied by hydrothermal alteration,and the metallogenesis occurs inside the rock mass and its surrounding rock contact zone.Such deposits are generally large in size,diverse in associated components,concentrated in mineralization,large in depth,easy to mine,and high in economic value,and have an important position in the development and utilization of metal minerals.The Longtoushan gold deposit is located in the subvolcanic rock body at the southwest tip of the Longshan nose anticline in the Dayaoshan uplift.The southwestern part of the Pingtianshan gold-silver polymetallic ore field is a typical cryptoexplosive breccia-type gold deposit.In order to clarify the genesis and ore-controlling factors of ore deposits,the control effect of the structure on the deposits and ore bodies,ore mineral characteristics,diagenetic metallogenic age and metallogenic regularity,the formation,structure,magmatic rock,wall rock alteration and geochemistry of the study area A large amount of data collection work has been carried out in other aspects,and combined with the geological characteristics observed in the field survey to summarize and then establish a metallogenic model.Through this research,I have gained some understanding of Longtoushan gold deposit:The Cambrian Huangdongkou Formation and the Lower Devonian Lianhuashan Formation in the Longtoushan gold deposit are the main strata.Magmatic rocks are developed in the mining area,fold structures and fault structures are developed,and hydrothermal alterations such as tourmaline,silicification and pyrite mineralization are generally developed,tourmalinization silicide pyritization hydrothermal alteration,such as common development,ore tumble belt and alteration zoning has certain correlation between diagenetic mineralization has a period of time,give priority to with yanshan epoch source of ore-forming materials with mantle source material is given priority to,and in the process of magma rising from the extraction of surrounding rock in the enrichment of the ore-forming material sources of ore-forming materials with light rare earth-strong negative europium anomaly characteristics There are various ore-controlling factors within the deposit,and the overall shape of the deposit is controlled by cryptoexplosion breccia tube.Gold mineralization mainly occurs at the edge of the cryptoexplosion breccia tube and in the contact zone between the tube and the surrounding rock,with the mineralization characteristics of upper gold and lower copper.