Wilson, Paul and Dickson, A. D. (1996) Radiaxial calcite: alteration product of and petrographic proxy for magnesian calcite marine cement. Geology, 24 (10), 945–948. (doi:10.1130/0091-7613(1996)024<0945:RCAPOA>2.3.CO;2).
Abstract
Radiaxial calcite is a common and distinctive pore fill in ancient limestones, but theorigin of this fabric is highly controversial. We present data from the Late Cretaceous equatorial Pacific that suggest that radiaxial calcite forms through alteration of earlymagnesian calcite (>7 mol% MgCO3) marine cement. These data suggest that radiaxial calcites are not straightforward indicators of pore-fluid chemistry. On the other hand, thepresence of radiaxial calcite in limestones may provide a distinctive petrographic proxy forearlier magnesian calcite cement and thus a generally warm CaCO3-saturated marine environment.
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