The weathering of norite at Black Hill, South Australia
作者:
J. T. Hutton,
DianneS. Lindsay,
C. R. Twidale,
期刊:
Journal of the Geological Society of Australia
(Taylor Available online 1977)
卷期:
Volume 24,
issue 1-2
页码: 37-50
ISSN:0016-7614
年代: 1977
DOI:10.1080/00167617708728965
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
Black Hill is a boulder‐strewn residual of norite standing 45 m above the Murray Plains about 80 km northeast of Adelaide. Between the boulders, the crystalline rock has weathered to a dark‐brown terra rossa‐rendzina soil with calcite, illite, kaolin, and hematite as the principal secondary minerals. At one site on the smooth lower slopes of the outcrop, the material above the norite consists of partially weathered granular fragments with considerable dolomite and some calcite in nodular form. Below the surface, the rock has been weathered along joints to produce the clay mineral nontronite, and between each corestone and this plastic clay there is a zone of laminated but essentially unaltered rock 10–25 cm thick. Pieces of amorphous silica occur sporadically in some joints and on the surface.
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