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Evidence for surface reaction‐controlled growth of carbonate concretions in shales
Author(s) -
RAISWELL R.
Publication year - 1988
Publication title -
sedimentology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.494
H-Index - 108
eISSN - 1365-3091
pISSN - 0037-0746
DOI - 10.1111/j.1365-3091.1988.tb01236.x
Subject(s) - geology , carbonate , precipitation , oil shale , diffusion , geochemistry , mineralogy , paleontology , chemistry , physics , organic chemistry , meteorology , thermodynamics
ABSTRACT Estimates for the rate of concretionary growth in shales are based on models which assume that growth is diffusion‐controlled. However, laboratory and field studies of CaCO 3 precipitation in organic carbon‐rich sediments indicate that surface reactions control growth, due to inhibition by various dissolved species. The spatial distribution of carbonate concretions in the Jet Rock (Lower Jurassic, England) is also inconsistent with diffusion‐controlled precipitation of CaCO 3 into concretions, and growth must have been at least partly surface reaction‐controlled.