PALYGORSKITE IN THE REGOLITH FROM THE MOKAU DISTRICT, NORTH-ISLAND, NEW-ZEALAND

Authors
KIRKMAN JH WALLACE RC
Citation
Jh. Kirkman et Rc. Wallace, PALYGORSKITE IN THE REGOLITH FROM THE MOKAU DISTRICT, NORTH-ISLAND, NEW-ZEALAND, Clay Minerals, 29(2), 1994, pp. 265-272
Citations number
31
Categorie Soggetti
Mineralogy
Journal title
Clay Minerals → ACNP
ISSN journal
00098558
Volume
29
Issue
2
Year of publication
1994
Pages
265 - 272
Database
ISI
SICI code
0009-8558(1994)29:2<265:PITRFT>2.0.ZU;2-B
Abstract
Corrugated mats of palygorskite occurring in regolith overlying a fiss ured limestone were examined by X-ray diffraction, infrared spectrosco py. and electron optical techniques after heating at 50-degrees-C inte rvals to 700-degrees-C. Palygorskite 'anhydride' formed at 400-degrees -C and sillimanite formed at 500-degrees-C. The palygorskite is believ ed to have formed in joints in limestone of Upper Oligocene age (Duntr oonian) prior to uplift and subsequent weathering. It is highly crysta lline, and appears not to have altered or weathered since precipitatio n.