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Evidence of Ostwald ripening related recrystallization of diagenetic chlorites from reservoir rocks offshore Norway

Published online by Cambridge University Press:  09 July 2018

J. S. Jahren
J. S. Jahren*
Affiliation:
Department of Geology, University of Oslo, PO Box 1047 Blindern, 0316 Oslo 3, Norway
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Abstract

Chemical variations in individual chlorite crystals of diagenetic origin delineated by energy dispersive X-ray spectroscopy (EDS) in a transmission electron microscope (TEM) indicate a temperature dependent chemical zonation in each grain. Silicon decreases and Al increases with higher temperature resulting in a decreasing Si/Al ratio away from the crystal core reflecting the time and rate of the crystal growth. Chlorite particle-size distributions obtained by scanning electron microscopy (SEM) give steady state profiles which suggests that the chlorite growth is controlled by a grain coarsening process related to Ostwald ripening.

Type
Research Article
Information
Clay Minerals , Volume 26 , Issue 2 , June 1991 , pp. 169 - 178
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1991

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