Basalts and silcretes on the coast near Ulladulla, southern New South Wales
作者:
R. W. Young,
Ian McDougall,
期刊:
Journal of the Geological Society of Australia
(Taylor Available online 1982)
卷期:
Volume 29,
issue 3-4
页码: 425-430
ISSN:0016-7614
年代: 1982
DOI:10.1080/00167618208729224
出版商: Taylor & Francis Group
关键词: Basalt;silcrete;uplift of Southern Highlands (N.S.W.);K‐Ar ages
数据来源: Taylor
摘要:
Silcretes on the N.S.W. coast near Ulladulla have long been attributed to. a sub‐basaltic origin, but field evidence is at odds with all variations of the sub‐basaltic hypothesis, and one site shows good evidence that the basalt post‐dates the silcrete. K‐Ar ages averaging 29.7 ± 0.5 Ma from the basalts provide a minimum age for silcrete development in this area. Furthermore, the K‐Ar dates, together with evidence for an erosional rather than tectonic origin of the coastal lowland, demonstrate that the adjacent tablelands reached their present elevation prior to the mid‐Oligocene.
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