Abstract:

Most of Nanpinjing area among the foundary of Dian-Qian-Gui district are covered with Triassic clastic rocks,and is developed here and there with faults,folds,as well as with dense vegetation.Therefore,most of geological characteristics in this area can hardly be found out with conventional geological methods,however,interpretions of Landsat images would presents a better results.This articale is only concerned with the 109 cycular images of Landsat in this area,they can be divided into seven types:1.Longhuo type(surface dome);2.Longpang type(surface basin-like syncline);3.Balin type(dome on surface and in subsurface);4.Zhumushan type(basement dome);5.Daima type(rotated and rolled structure);6.Lugu type(depressed in deep but domed near surface);7.Sanxiangdong type(underground intrusive rocks).This paper deals with their regularity of distribution in space and their relationships to rifts,intrusives and geothermal active zones.As a result,we points out that they are highly coincident with the present gravity and magnetic anomaly.The author considered that a lot of cycular images in this area which correspond to surface positive and negative dome structure may be intrusives if it is tracked toward the depth.Thus,the sedimentary developing pattern of dome structure covered with Triassic clastic rock is established.The cycular images with different sizes,definite or ambiguous figures are some results of the geological bodies of underground depth(intrusive or geothermal bodies)with some components escaped and with different depth affecting the surface.Peeping the oil and gas potential of Nanpanjiang depresston from the satellit images,Zanba and Balin cycular images are the best districts favourable in prospecting.