| The Beishan metallogenic belt is located in the docking site of the Tarim plate and the Kazakhstan plate.The regional tectonic-magmatic activity is strong,and the distribution of copper,gold and polymetallic minerals in the area is more.Copper deposits such as Tuwu,Yandong,Mopanshan and Huitongshan are found,indicating that the region has good prospecting prospects.The Beishan metallogenic belt is located at the junction of Gansu,Xinjiang and Inner Mongolia provinces,and convenient transportation has greatly promoted regional mineral exploration.The metallogenic belt has become an important copper polymetallic ore belt in northwest China,and has attracted much attention.Previous studies have suggested that Huitongshan copper deposit is a typical skarn deposit,and the output of the deposit is mainly controlled by the contact zone between the brick red syenite granite and the marble of the Lower-Middle Ordovician Huaniushan Group.In view of the obvious distribution characteristics of the contact zone between the rock mass and the stratum in this region,it is an important ore-controlling condition for the regional copper deposit,and the traditional geological survey efficiency is not high.In this paper,high-precision multispectral remote sensing data are used to interpret the strata,structure,lithology and mineral alteration information in bedrock exposed areas.The remote sensing prospecting prediction of regional copper deposits can greatly improve the work efficiency,find new ore-bearing rock masses,new mineralization and alteration,and put forward new prospecting clues,in order to provide reference for the prospecting of northern Tianshan copper deposits.Taking Huitongshan as the study area,NW-trending faults as the main ore-controlling structures and modern metallogenic prediction theory as the theoretical guidance,this paper comprehensively analyzes the geological metallogenic conditions of Huitongshan ore belt and summarizes the metallogenic regularity.O n the basis of geological analysis to carry out remote sensing information technology extraction,the establishment of regional copper ore remote sensing prospecting model,the main achievements :(1)Summarizing the previous results that the main deposit type of Beishan metallogenic belt is porphyry copper deposit;It is considered that the fault is the main ore-controlling factor,and the NW-trending fault structure is the most favorable for the mineralization of Huitongshan copper deposit.The upper rock group of the Lower-Middle Ordovician Huaniushan Group is an important horizon for the occurrence of copper deposits,providing abundant mineral sources.Skarnization,serpentineization and hornfelsization are important alteration types of regional copper deposits;Malachitization and chalcopyrite mineralization in marble contact zone between Indosinian brick red syenite granite and Lower-Middle Ordovician Huaniushan Group are important prospecting indicators;(2)The study shows that granite and marble are widely distributed in the area,and the use of remote sensing interpretation can quickly identify the contact area between granite and marble,and delineate the new favorable prospecting area of Huitong Mountain;In this paper,the band ratio(BR),pseudo-color synthesis(FCC)and support vector machine method are used to enhance the metallogenic information.A new contact zone between granite and marble is found,and a new prospecting space is proposed.It is considered that the contact zone between granite a nd marble in the eastern Huitong Mountain is the best metallogenic favorable area;(3)In order to further analyze the ore-controlling structure of Huitongshan Copper Mine,this paper uses remote sensing technology to effectively identify and extract the distribution of major faults in the area by using directional filtering and Laplace operator edge linear enhancement.Combined with the geological data of the study area,nine major faults and 24 secondary faults are extracted in this study.It is believed that the structural trend in the study area is mainly distributed in NW,NE and nearly EW directions,and NW-trending faults are the main metal ogenic structures;(4)Studies suggest that ore bodies occur in skarnized marble,often copper skarn;The main ore-bearing altered minerals are divided into four groups : Mg-OH minerals such as serpentine and epidote;Chlorite,chlorite and other Fe-OH minerals;Iron minerals(limonite,hematite);Carbonate minerals(calcite,dolomite).In this paper,the principal component analysis is used to extract the alteration information of Mg-OH,Fe-OH,iron staining and carbonate.Corresponding to the four groups of alteration minerals,the extracted alteration information has high reliability,which provides a new prospecting space for finding new mineralization and alteration in the region,and further proves that the eastern periphery of Huitongshan has a good potential for prospecting skarn copper deposits;(5)Combined with the analysis of geological metalloge nic conditions of regional copper deposits,the prospecting criteria and prospecting model of remote sensing in the study area are established;According to the metallogenic geological conditions of the study area,combined with the four groups of alteration and mineralization information extracted by remote sensing,three target areas were delineated in the study area,which provided a new favorable prospecting area for the prospecting of northern Tianshan copper mine,and also provided a new method for the exploration of regional copper mine. |
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