New Zealand Journal of Geology and Geophysics abstracts

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Clinoptilolite in the Ashley Mudstone, Waihao River section, South Canterbury, New Zealand

DAVID N. JILLETT
DOUGLAS S. COOMBS

Geology Department
University of Otago
P.O. Box 56
Dunedin, New Zealand

Abstract  Euhedral high calcium clinoptilolite, with composition of a representative electron microprobe analysis (Ca2.31K0.34Mg0.44Na0.06Fe0.05)[[Sigma]]3.30(Al6.87Si29.91)[[Sigma]]36.08O72 .nH2, infills foraminifera and replaces shelly material in the late Eocene Ashley Mudstone, Waihao River, South Canterbury. The unit has been buried by later Tertiary sediments to a depth not greater than c. 1000 m, and has been subjected to temperatures of not more than a few tens of degrees. Phillipsite occurs with sideromelane in the underlying basaltic Kapua Tuff.

Keywords  clinoptilolite; phillipsite; Ashley Mudstone; Kapua Tuff; foraminifera; zeolites; diagenesis; Waihao River

New Zealand Journal of Geology and Geophysics, 1995, Vol. 38: 263-265

0028-8306/95/3802-0265 $2.50/0 (c) The Royal Society of New Zealand 1995

PDF file of entire paper: medium quality (1468K); (scanned from paper original: notes about this process)

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