Mafic peperite from the Gold Creek Volcanics in the Middle Proterozoic McArthur Basin, Northern Territory
作者:
D. J. Rawlings,
期刊:
Australian Journal of Earth Sciences
(Taylor Available online 1993)
卷期:
Volume 40,
issue 2
页码: 109-113
ISSN:0812-0099
年代: 1993
DOI:10.1080/08120099308728068
出版商: Taylor & Francis Group
关键词: Gold Creek Volcanics;intrusions;mafic;McArthur Basin;Middle Proterozoic;Northern Territory;peperite
数据来源: Taylor
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.
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