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| Titel: |
The weathering of norite at Black Hill, South Australia |
| Auteur: |
Hutton, J. T. Lindsay, Dianne S. Twidale, C. R. |
| Verschenen in: |
Australian journal of earth sciences |
| Paginering: | Jaargang 24 (1977) nr. 1-2 pagina's 37-50 |
| Jaar: |
1977-03 |
| Inhoud: |
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. The dark-brown soil appears to be related to the present environment but the nontronite in the joint weathering, the dolomite, and the amorphous silica are all consistent with the norite having been inundated, possibly during the Miocene marine transgression. Calculations based on the retention of elements such as aluminium, potassium, titanium, and iron have been used to predict quantitatively the amount of certain minerals such as quartz, calcite, and dolomite introduced to the weathering profiles. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 11 van 13 gevonden artikelen
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