OCCURRENCE OF NACRITE IN THE LODEVE PERMIAN BASIN (FRANCE)

Citation
Md. Buatier et al., OCCURRENCE OF NACRITE IN THE LODEVE PERMIAN BASIN (FRANCE), European journal of mineralogy, 8(4), 1996, pp. 847-852
Citations number
14
Categorie Soggetti
Mineralogy
ISSN journal
09351221
Volume
8
Issue
4
Year of publication
1996
Pages
847 - 852
Database
ISI
SICI code
0935-1221(1996)8:4<847:OONITL>2.0.ZU;2-G
Abstract
Authigenic euhedral kaolins of nano-to-millimetre size were found in d olomite cavities in the Cambrian basement of the Lodeve Basin, France. X-ray diffraction, DTA and infrared-spectroscopy data demonstrate tha t nacrite is the only kaolin phase present in the cavities. Nacrite is associated with authigenic quartz, barite, dolomite and calcite. Petr ographic data indicate a contemporaneous growth of nacrite and quartz after dolomite. In some cavities, barite and nacrite crystallized toge ther. The crystallization of quartz, nacrite and barite could be the r esult of fluid influx and trapping in a karstified basement during the Late Permian extensional tectonic regime that affected the Lodeve Bas in.