The formation and significance of coralline silica speleothems in the Sydney basin, southeastern Australia

Auteur(s) et Affiliation(s)



Description :
This paper focuses on a suite of less-commonly reported speleothems, those formed almost entirely of silica, and on a quartzose rather than carbonate base rock. Detailed analysis using SEM, XRD, and thin-section techniques revealed layered composition of both amorphous opal-A and crypto-crystalline chalcedony. Calcite forms no part of these stalactites. They clearly are not relict features and are forming under present-day temperate-climatic conditions, not the tropical conditions demanded by some AA. for silica stalactites elsewhere.


Type de document :
Article de périodique

Source :
Physical geography, issn : 0272-3646, 1997, vol. 18, n°. 1, p. 1-17, Collation : Illustration, Références bibliographiques : 59 ref.

Date :
1997

Editeur :
Pays édition : Royaume-Uni, Abingdon, Taylor and Francis