| Mengzi County of Yunnan province Bainiuchang ore deposit is a very large-super large silver polymetallic deposit in Southeast of Yunnan polymetallic metallogenic belt.At present,the genesis of the ore deposit are still controversial,and affecting the direction and method for further exploration.This article use remote sensing digital image processing and human-machine interactive interpretation method.Mainly by the Erdas Imagine software way of platform.Collected the TM/ETM+,ASTER remote sensing data of Gejiu and Bainiuchang area to mosaic image,clipping and geometric correction,then analysis each band of the remote sensing data characteristics.Choose the best band to do the color combination,principal component analysis,histogram stretching,ratio operation and a series of image enhancement processing.The article combined with the basic theory of remote sensing technology and the basic theory of mineral deposit geology.From the metallogenic geological environment,the distribution regularity of ore deposit and ore deposit characteristics,to reveal the internal connection between the ore deposit characteristics and remote sensing information.Interpretate and analysis the image linear-ring structure pattern of Bozhushan-Bainiuchang area.Determining the linear structure,ring structure,find the relationship of combinations and grade system among them in Bainiuchang area.In this study,we find there is a EW axial lense in Shidong-Baizhuge area.It is not coordinated with NE-NW tectonic system in this area.And the core part is secondary east-west axial of lense—the Bainiuchang lense.It maybe reflected in early depression basin to the sea on the remote sensing images.The lense is correspond to near east-west axial Yuanbaoshan syncline which is control the ore distribution.These information reveals some characteristics of concealed structure in this area.So,this article compare with the image linear-ring structuce and alteration information in Bainiuchang ore deposit and Gejiu ore deposit to analysised.The conclusion is that the east-west axial lense and north-east axial complex fold are superposition.Being a ring and ring transverse overlapping style structure what was the important ore controlling structure in this area.Reflect the characteristics of Bainiuchang ore deposit was multi stage homothetic mineralization.This is different from the couple rings structure and multiple equiaxed ring intensive development characteristics in Gejiu ore deposit.And,the phenomenon of iorn staining and argillation alteration information were weak.Display the genesis of the deposit is different between Bainiuchang ore deposit and Gejiu ore deposit.And the mineralization characteristics maybe difference. |
PDF Full Text Request