Adv. Space Ret. Vol. 12, No. 7, pp. (7)27—(7)30, 1992 0273—1177/92 $15.00 Printed in Great Britain. All rights reserved. Copyright © 1992 COSPAR INTEGRATED MSS-SAR-SPOT- GEOPHYSICAL AND GEOCHEMICAL DATA FOR EXPLORATION GEOLOGY IN YEDER AREA Guo Huadong and Dong Pinliang Institute of Remote Sensing Application, Academia Sinica Be~ing 100101, China ABSTRACT The Yeder test area is located in the north Xinjiang Uygur Autonomous Region of China, in an area with an arid continental climate, sparse vegetation cover and extensive rock outcrops. This paper presents a part of the results of our finished project entitled “Remote Sensing for Geological and Mineral Exploration in Xinjiang Region of China”. The X—band synthetic aperture radar (SAR) imagery with two illuminated directions is acquired and digitally processed, which demonstrates the effectiveness for the study of geological structure. The Landsat MSS and high resolution SPOT imagesare mainly used for recognition of rock types. The integrated analysis of remotely sensed, aeromagnetic and geochemical data has been made with the support of the geographic information system. In corrobo- ration with intensive field investigation, we have defined the existence of the “Yeder arc structure”, in which three gold anomalies and an alteration zone have been found. INTRODUCTION Geological exploration using remote sensing techniqueshas been extensively documented. Increasingly, multi-source data has been used to aid in exploration geology /1 ,2/. In the last three years, a national key project entitled “Remote Sensing for Geological and Miner— al Exploration in Xinjiang Region of China” has been carried out by the authors et al. As part of the project, the work described here aims at demonstrating the integrated analysis of remotely sensed, geophysical and geochemical data for exploration geology in Yeder area. The Yeder test area, approximately 36x36 sq-KM, is located in the central part of Ertix region of north Xinjiang with sparse vegeta- tive cover and relatively extensive outcrop (Figure 1). Geologically, this ares is situated on the compressive boundary between the Al- tay folding belt and the Junggar block. The two tectonic elements are separated by the Ertix Fault whose general trend is NW-SE. Cor- respondingly, the area is divided into two stratigraphical districts by the Ertix Fault. The main rocks are the metamorphic ones on the north side of the Ertix Fault, while all kinds of rocks are not metamorphosed on the south side of the Ertix Fault. For the last few decades, several mineral deposits such as iron, copper and nickel have been reported in the test area. SAR imagery (E—W direction) SAR imagery (S — N direction) I MSS imagery 88~E I aeromagnetjc data (ST) ~~Fuhai ~ ~ geochemical data (Au) I ~ geochemical data (Cu) i6~N 46~N geochemical data (Ni) ~ geochemical data (Cr) lineasnent density data geologic structure Qitai rock—type 44~N©wuiumuqi ° mineral occurrences Fig .1. Location map Fig .2. Integrated data sets of the test area. showing test area. (7)27