|
| volgende >> |
Tijdschrift beschrijving
Alle jaargangen van het bijbehorende tijdschrift
Alle afleveringen van het bijbehorende jaargang
Alle artikelen van de bijbehorende aflevering
Details van artikel 1 van 9 gevonden artikelen
| Titel: |
Allophane and opal speleothems from granite caves in south-east Queensland |
| Auteur: |
Webb, J. A. Finlayson, B. L. |
| Verschenen in: |
Australian journal of earth sciences |
| Paginering: | Jaargang 31 (1984) nr. 3 pagina's 341-349 |
| Jaar: |
1984-09 |
| Inhoud: |
Coralloidal and flowstone speleothems occur in two caves in the Stanthorpe Granite at Girraween National Park, south-east Queensland. The cave coral is found on the cave roofs and consists of banded opal-A with small mineral inclusions derived from the overlying granite. Coral from one cave contains a small component of allophane. The flowstone occurs on the floor of one cave, and is composed of thinly banded allophane, which has an unusual composition characterised by high levels of aluminium, phosphate and organic carbon. The allophane is precipitating only from water that has seeped through humus and soil. This is the first positive identification of allophane in speleothems, and also provides convincing evidence that allophane can precipitate directly from solution. (Most allophane forms by alteration of vitric parent materials in soils.) |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 1 van 9 gevonden artikelen
| volgende >> |