Study On Metallogenic Regularity And Metallogenic Prediction Of Gold Deposits In Yata Area,Southwest Guizhou Province

The research area is located in the southwest of Guizhou Province,and the administrative division is under the jurisdiction of Yata Town,Ceheng County,Guizhou Province.The geotectonics is located in the SW of the structural variation area in the NW direction of Yangzi quasi platform--Qiannan platform depression--Wangmo,which is an important part of the "golden triangle" of Yunnan,Guizhou and Guangxi.Since the discovery of Banqi gold deposit in 1978,a series of gold deposits such as Yata gold deposit,Banwan gold deposit,Naban gold deposit and Dagou gold deposit were successively discovered.Although the exploration and research of gold minerals in the area have achieved fruitful results,the distribution of geological and mineral exploration is not balanced,and the research content also has its own focus.On the whole,in terms of the source of ore-forming fluids,some scholars have considered the characteristics of the combination of mantle and crust sources of ore-forming fluids of gold deposits in this area through studies on S,C,O,Pb and other isotopes,but there is a lack of strong evidence;In the summary of the metallogenic regularity and metallogenic prediction of gold deposits,the predecessors have made a lot of discussions on the relationship between structure and metallogenic,but there is a lack of detailed comprehensive study of geophysical,geochemical and remote sensing,and no effective prospecting prediction model has been established.In this paper,the Yata gold deposit and the Banqi gold deposit in the area are selected as typical deposits.The following works were did like large scale profile survey,geological route survey and exploration results of Geophysics,in order to understand the geological features of typical gold deposits in the area.Based on the above works,it is believed that there are mainly two types of ore deposit metallogenic model in this area,respectively "Fault-controlled type" which represented by Yata gold deposit and "Layer-Controled type" which represented by Banqi gold deposit,combined with the exploration results of Geophysics,Geochemistry and Remote Sensing at key section locations in this time.In addition,it is speculated that there may be a hidden acid rock body which is provided for the gold deposits in this areaMineralization deep in the Naban dome,through analyzed the findings of remote sensing geological interpretation of the Yata area,1: 50,000 area gravity measurement and broadband electromagnetic sounding this time.In terms of ore-controlling factors,it is believed to be mainly structure and stratigraphy: the regional Pingtang-Kaiyuan concealed fault along the Zhegao-Qiaoma-Yata-Zhema line passed through this area,and the existence of regional deep faults provide the space to the migration of deep ore-forming materials and ore-forming fluids;fracture structures and layered structures form the metallogenic structural planes of the gold deposits in this area;favorable lithological assemblages,especially the silica-calcium interface composed by the limestone of the Maokou Formation with good permeability and the fine-clastic rocks with good shielding properties plays a role as a geochemical barrier,further contributing to the formation of gold deposits in this area.When analyzing the anomalous characteristics in the area,this paper uses the gravity step belt in the gravity anomaly to infer faults,and uses the fluctuations of the resistivity anomaly gradient zone to infer the fluctuations of the P/T unconformity interface,and seven comprehensive anomalies are circled based on the 1:50,000 sediment measurement results,and the remote sensing anomaly analysis mainly focuses on hydroxyl anomalies and iron stain anomalies.Based on summarizing the metallogenic law of gold deposits in the Yata area,this paper then comprehensively analyzes various anomalies to refine and summarize the prediction factors,and construct a gold deposit prediction model in the Yata area.Finally,the MRAS2.0software is used to divide the mineralization prospect area,and 3 prospecting target areas are circled and introduced respectively.