THE SALPETERKOP RING STRUCTURE, CAPE PROVINCE, SOUTH-AFRICA

被引：7
|
作者：
VERWOERD, WJ
机构：
[1] Department of Geology, University of Stellenbosch, Cape Province
来源：
TECTONOPHYSICS | 1990年 / 171卷 / 1-4期
关键词：
D O I：
10.1016/0040-1951(90)90105-H
中图分类号：
P3 [地球物理学]; P59 [地球化学];
学科分类号：
0708 ; 070902 ;
摘要：
Salpeterkop (32°29′S, 21°51′E) near Sutherland forms part of a dome with radial fractures extending to a distance of at least 16 km. Four concentric zones of decreasing megascopic deformation are distinguished, including a central crater 1 km in diameter, but no unequivocal shock features could be found. Intense brecciation is indicative of explosive eruptions. A radial and concentric fracture pattern has been exploited by trachytic and carbonatitic dykes. The regular outward dip of the surrounding strata is ascribed to uplift by an intrusive plug represented by numerous clast-rich trachytic apophyses at surface. The Salpeterkop structure is interpreted as a dome overlying an alkaline-carbonatite ring complex, obscured by a volcanic superstructure that has been only partly eroded. © 1990.
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页码：275 / 285
页数：11
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