仙居幅卫片上环形体的火山构造意义  

The Circular Features on the Xianju Landsat Image and Its Volcanic Structural Significances

作　　者：张福祥[1] 张登荣[1] 

机构地区：[1]浙江大学地质系

出　　处：《浙江大学学报（自然科学版）》1990年第3期465-473,共9页

摘　　要：仙居幅MSS和TM图像上显示的大量环形影像体可分为单圆环块、多圈环带、大型综合环块和弧形线环群四种类型。前三看又可进一步分为正向和负向两个亚类。本文具体剖析了它们的影像特征、地质内涵和所对应的火山构造(或机构)、区域展布格局以及同矿产的关系。研究结果有力证明:卫星影像环体分析对查明中生代火山岩大面积覆盖地区的区域构造及指导找矿有十分现实的意义。Analysis of the circular features on the landsat image in Mesozoic volcan-ics area is very instructive for the research cf regional volcanic structury.On the Xianju landsat image, the four kinds of circular feature---themonocircular piece, the multiring gridle, the large-scale combined circular piece,and the group of the are circular lines are distinguished. Generally speaking, the monocircular piece is usually connected with the mediosilicic-acidity Intrusive body or the paleovocanic cone, and the multiring gridle with the compound vocanic cone, the volcanic dome, the volcanic sedimetary depression or the caldera. The large-scale combined circular piece is homologous with the volcano-tectonic dome or the volcano-tectonic basin while the groop of the circular lines usually belongs to the boundry of the volcano-tectonic dmoe or basin.There are seven large-scale combined circular pieces in the area of the Xianju Landsat image. Those,together with the faulted subsiding basins distributed among them, as well as the regional big fractures of the strike NNE and NW constructed basic setup of the regional volcanic structure in the area.

关 键 词：火山构造 卫星影像 环形体 古火山 

分 类 号：P542.35[天文地球—构造地质学]