Benthic Foraminifera; Assilina dandotica, Assilina laminosa, Assilina leymerie, Assilina spinosa, Nummulites globulus Leymerie, Nummulites atacicus Leymerie, Nummulites mammalitus, Discocyclina dispansa, Discocyclina ranikotensis, Lockhartia conditi, Operculina, Bigenerina, Miliolids, Textularia and Planktic Foraminifera; Globigerina along with some echinoderms and algal fragments often embedded in sparry calcite
or lime mud.
Cathodoluminescence images show growth zonations within certain sparry calcite
crystals, but dull to nonluminescent sector zonations are mostly observed (Figure 4).
Diagenetic processes starts with the crystallization of low- Mg sparry calcite
(microspar) as radial aggregates normal to the depositing surface of micritic microbial filaments (Fig.
The pore spaces are filled with sparry calcite cement.
The limestone contains some fractures filled with sparry calcite cement.
Allochemical constituents, carbonate mud matrix (micrite) and sparry calcite cement are the major components of carbonate rocks, Folk (1959, 1962).
Large coarsegrains of sparry calcite which were white and grey in colour were observed to be dominant in Plates 1 and 7.
cement and scattered quartz silt filled the micro-cracks.
Chert, sparry dolomite, sparry calcite
, malachite, and pyrite are present in rare brecciated pods.
Dissolution fractures are filled with bitumen and sparry calcite
in the 1st section of Donggangling Formation.
The diagenetic fabric is characterized by microbial micritization neomorphic alteration and presence of micro fractures filled with sparry calcite
Calcite cement is mainly in the form of sparry calcite