This paper discribed concisely the necessity of renewing old geological maps, and presented the importance of remote sensing technology in geological mapping of a new generation of China for improving the geographical base map's reality, identifying the classification system of geological unites, providing informations of stratigraph, structure, intrusive body, and discovering some important geological body and geological phenomenon that cann't be founded by normal methods. It has been outlined in general how remote sensing data are selected in geological mapping of a new generation.
In this paper, a new theory about the evolution of the granite magma with the same source and a new method of geological mapping of unit and super-unit system is introduced based on the evolution sequence of mineral composition and texture of granite. which can be recognized with the line of reflected spectrum of diffrent granite units. The methods of the recognizing of the unit of granites, arrangement of the unite and analyzing of the structure of the granite system are also introduced. It is proved that after the renerwing of the geological theory about granite, the advantage of remote sensing on geological mapping of unit-superunit system for granite remains with correct way and the precision of processing and the level of geological investigation can meet recent geological mapping of unit-superunit system.
Both Wangangheng and Shigezhuang complexes strongly correlate with regional mineralization and diagenesis of complexes in northern part of Taihang mountains. It is obvious that the mineralization and diagenesis are controlled by circular structures and tectonic zones which strike in NNE, NE, SN, EWand NWdirection respectly, especially those tectonic zones in SNand NWdirection have strongest relationship with mineralization in the study area. The structure dominate the emplacement and distribution of intrusions and, partial boundary and geometrical pattern of complexes. The Structure can become the host structure and control the distribution of altered rocks.
It has a remarkable effect to use technologies of synthetical remote sensing and multi-source imformation compounding such as the land- satellites TMand MSSimages, the airborne colour infrared photography and the infra led scanning digital image, during the 1:50000 remote sensing geological survey and the prognosis of gold and uranium mineralization in the area of the north in Anxi, Gansu (westen area in south band of Bei Shan). It has procured a great development in the fields of the synthetical application of remote sensing technology, the basic geology, the prognosis of gold (uranium) minerals and the 1:50000 remote Sensing geologic mapping study. During the three years, we have completed 1: 50000 geologic map and 1:50000 mineral resource map 21 pictures for each. Nearly one thousand of altered rock and 67 gold-ore targets were found out, favourable areas of uranium mineralization are identified further. It supplies amount of important bases for searching new mines.
This paper discusses and analyses the factors of the influence upon the geometric shape (slope.aspect) of targets on the imging radar(SIR-A) image. surface roughness. physical and electric characteristics of targets and the interpretative features on SIR-Aimage in bedrock area. The Chuanli ring structure is found. It is difficult to show the ring strueture on the other remotely Sensed image. Combining geological conditions of regional minerogenesis, The Conceal matrix and mineral deposit are prospected in study arear.
According to the interpretation of TMimages around the copper-gold deposit in Ziginshan, shanghang county, Fujian, the "line.circle. colour"remote sensing geology model of the known deposit has been set up, minerogenetic geological environment around the deposit has been estimated and twelve prospective areas have been looped. Geological Parties have found some copper mineral occurrences and mineralized points in our prospective areas in recent two years.
This paper discusses the application of multitemporal remote sensing data for dynamic comparision studies on the character of geological environment, the current situation and development trend of major environmental geological problems in Shenfu-Dongsheng area of 48000 km2 (including mining region of 9500 km2). Then, the quality of environmental geology is comprehensive assessed for whole area.
Lineament field in a remotely sensed image is the reflection of geotectonic and geological minerlizing field on the surface of the earth and on the image, and is an indicator for geologic study and mineral exploration. From the point of view of the concepts of geological anomaly and lineament field, digital analysis methodes are discussed by using image processing techniques in the paper, and the digital analysis model are developed: (1) the calculating and diagramming of statistic features of lineament field; (2) digital presentation of the field; (3) mathematical analysis of the field. The lineament field analysis in Tongling Region was taken for an example to illustrute the application of the methodes to geological tectonic study and mineral prospecting.
Mineralization often is related to altered rocks. Landsat TMwith two bands within the short infrared wavelength (1. 1-2.5 μm) supples the ability for altered rocks mapping. But the vegetation covery masks the altered rocks information and confuses the reflectance spectrum. Three methods were developed for altered rock mapping in middle density vegetation area. They are principal component analysis, least square fit and unmixing. These methods are successfully applied in DianQingGui area for disseminated gold exploration. The clay minerals distribution information which is related to disseminated gold deposits were extracted and mapped,
According to defined the texture as the measurement of image gradient of grey, two parameters can be obtained to describe remote sensing image quantitatively. They are tile texture intensity and the texture density. The texture intensity is used to show differences of one pixel with its neighbours, while the texture density is used to show the frequency of changes of grey level. In addition the relative gradient are defined to describe the texture characteristic of image from tile relative changes of grey level. The producted texture images from this method include both the information of space and part of information of spectrum. So the texture structures in the overbright and over-dark ranges can be shown obviously. In this paper, we also discuss how to select the size of the moving window.
