The limestone also exhibits microstylolite set and the insoluble materials and mineral grains are often concentrated along the stylolite
1) Three meters of gray, thick-bedded limestone in which traces of stylolite
and dispersed fractures are observed.
The diagentic features of the Formation includecementation, dissolution, micritization, fracturing, stylolite
, recrystallization, pyrite mineralization and dolomitization and are explained by meteoric, marine and burial diagenetic history of the rock unit.
These are low amplitude stylolite
to stylolitic swarms and/or irregular stylolite
solution seams are isolated or swarm-like partings characterized by thin seams often with accumulations of insoluble residues (Logan and Semeniuk 1976).
These planes are usually but not always characterized by the accumulation of relatively insoluble residues or authigenic minerals along them which form the stylolite
The diagenetic fabric recognized in the Formation include compaction, cementation, aragonite to calcite transformation, microbial micritization, neomorphism, pressure dissolution and stylolite
formation, mechanical and chemical compactional features as fractured and broken grains, dolomitization, incorporation of iron into calcite and dolomite as late stage diagenetic events and deformation due to tectonism.
Photomicrographes of lime mudstone having calcite vain (Cv), stylolite
(Sy), ostracods (Os), sponge spicules (Sd) and pellet (Pe) in lime mudstone microfacies.
The presence of clayey/lime mud matrix, neomorphic spar cement, close packing with sutured contacts, stylolites
with iron oxide/ clay are the main porosity reducing factors in the Lower Gorn Formation.
Key words: Jutana Formation, Cross Bedding, Microfacies, Dolomite, Stylolites
Besides voids the stylolites
served as conduits for these fluids (Fig.
The movement along the plane of fracture is usually demonstrated by presence of some kind of the kinematic indicator (calcite steps, slickenlines, stylolites
The stone is massive, but the thickness of extracted blocks is limited by stylolites