MAFIC PEPERITE FROM THE GOLD CREEK VOLCANICS IN THE MIDDLE PROTEROZOIC MCARTHUR BASIN, NORTHERN-TERRITORY

被引:20
作者
RAWLINGS, DJ
机构
[1] Northern Territory Geological Survey, Department of Mines and Energy, Darwin, NT, 0801
关键词
GOLD CREEK VOLCANICS; INTRUSIONS; MAFIC; MCARTHUR BASIN; MIDDLE PROTEROZOIC; NORTHERN-TERRITORY; PEPERITE;
D O I
10.1080/08120099308728068
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
Peperite is a non-genetic term used to describe volcanic breccia in which a texture of dark blocks in a light matrix resembles a mixture of salt and pepper. In the Gold Creek Volcanics, peperite is a mixture of partly vesiculated basalt clasts in a mudstone-sandstone matrix. It is formed by the buoyant intrusion of basaltic magma into wet unconsolidated sediment. The intruding bodies deform and quench, giving rise to discordant masses of hyaloclastic breccia, confined largely to the subsurface. These basalt masses may remain hot enough to locally superheat pore water and produce convective systems where the basalt clasts and fluidized sediment become mixed, forming the distinctive peperite.
引用
收藏
页码:109 / 113
页数:5
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