Extraction Of Gold Mineralization Information And Optimization Of Prospecting Target Areas In Yahua Xinzhai, Lancang, Yunnan

The advanced-exploration area of the Yahuaxinzhai Lancang County gold deposit in Yunnan Province is located at the junction of Lanping-Simao bidirectional arc-Intracontinental basin and Biluo snowy moutain-Lincang continental margin,is a variety of ore-forming favorable tectonic environment and a variety of important metallogenic geological role"superposition"and coupling areas,with a typical ore-forming multi-period,the source of multi-minerals,Metallogenic conditions for genetic types of multi-deposits.The mineralization phenomena such as gold,copper,lead and silver have been found along the junction parts of different tectonic units,which have better metallogenic conditions and metallogenic background.Based on the systematic study of regional geological background and regional geochemistry,this paper this paper makes a preliminary analysis of the origin and origin of the ore-forming materials,analyses the geological data,geochemical data and remote sensing image of the comprehensive research area,extracts the favorable information of ore-forming and establishes the multivariate information quantitative prediction model,thus completes the Metallogenic prediction and the target area optimization.Main results:1.The exploration area is located at the junction of the Tibet-Sanjiang orogenic belt???,the Yangtze West margin,the multi-island arc-basin system??-2?,the Lanping-Simao bidirectional arc-intracontinental Basin??-2-6?cloud-Jinghong arc Basin?P???-2-6-1?and the bi-Roshe-Lincang Continental margin arc belt?P-T₂???-2-7?Lincang magmatic arc zone??-2-7-2?.The main outcrop strata are the lower Proterozoic?Pt₁?,the Paleozoic Permian,the lower part B?Pt₁?and the Mesozoic Triassic,the upper part B?T₃b?;The Metallogenic belt in this region is mainly copper,lead and zinc,gold,silver and other polymetallic minerals.2.The advanced-exploration area is located at the junction of the Yunling-Jinghong Arc Basin and the Lincang magmatic arc zone,and is controlled by the Shangmangbo fold bundle and the Lancang River Fault fragmentation zone.Gold mineralization is located in the fault fractured zone of Lancang River,the geochemical characteristics of mineralized rocks and the combination of microscopic characteristic minerals are chalcopyrite-magnetic chalcopyrite-common pyrite,pyrite-arsenopyrite-gold-antimony glance;the metallogenic period is deduced to be at least the second period mineralization according to the element assemblage characteristics,and the basic substances in the strata of the Lower Permian B segment?P1B?are rich in Au,Ag,As,Sb,Cu,Pb,Zn and other metallogenic elements,under the influence of regional metamorphism and volcanic activity,promoting the activation and migration of Au and other metallogenic elements in the source layer,and integrate into the advantageous ore-forming tectonic parts,and the genesis of the deposit is the medium-low temperature hydrothermal deposit.3.The statistical characteristics of the contents of As,Sb,Bi,Hg,Au,Cu,Pb,Zn and Ag were analyzed,and the activation,migration and enrichment of metallogenic elements and the combination of elemental mineralization were discussed.According to the anomalous value of the elements,9elements of the combination anomaly zone are selected,and the high value areas converge in or near the fault zone,which also verifies the ore-controlling function of the fault structure.4.Based on the Landsat8 OLI and sentinel-2A images,this paper makes a quantitative analysis of the remote sensing geologic information of the advanced-exploration area and the extraction of the line and ring structure.According to the wave characteristics of altered minerals in the advanced-exploration area,the information of iron alteration anomaly and the abnormal hydroxyl alteration are extracted and classified,and the alteration anomaly region and the multivariate combination anomaly zone have good coincidence in space distribution and geographical location.5.According to the geological,regional geochemistry,remote sensing and so on of the advanced-exploration area,by using Morpas software,17 ore-forming favorable information,such as fault structure,ore-forming stratum,elemental chemical anomaly and linear structure are determined,the critical value of prospecting information is set up,And then delineated six favorable ore-forming target areas,of which one is the first level target,two are the?-level targets??₁ and?₂?and the third are the?-level targets??₁,?₂ and?₃?.