What is Oomicrite?
oomicrite A limestone, defined by the Folk classification as comprising ooids set in a micrite matrix. A Dictionary of Earth Sciences.
What is Biomicrite?
biomicrite A limestone consisting of bioclasts set in a micrite matrix. It is the product of a poorly sorted accumulation of shell fragments and mud. See FOLK LIMESTONE CLASSIFICATION.
What is a biolithite?
biolithite A carbonate rock formed of organisms that grew and remained in place, comprising a rigid framework of organisms, together with associated debris. A reef represents a typical biolithite.
What is Allochemical?
Allochemical rocks are those that contain grains brought in from elsewhere (i.e. similar to detrital grains in clastic rocks). Allochemical rocks have grains that may consist of fossiliferous material, ooids, peloids, or intraclasts.
What is a micrite sedimentary rock?
micrite, sedimentary rock formed of calcareous particles ranging in diameter from 0.06 to 2 mm (0.002 to 0.08 inch) that have been deposited mechanically rather than from solution. When formed almost entirely of shell debris, the rock is termed coquina (q.v.).
How hard is chert?
Chert has two properties that made it especially useful: 1) it breaks with a conchoidal fracture to form very sharp edges, and, 2) it is very hard (7 on the Mohs Scale). The edges of broken chert are sharp and tend to retain their sharpness because chert is a very hard and very durable rock.
What is Fenestral porosity?
Porosity developed in carbonates due to the presence of fenestrae. Rocks with fenestral porosity will not form good reservoir rocks unless the fenestrae are interconnected to permit a good permeability to be established. See choquette and pray classification. From: fenestral porosity in A Dictionary of Earth Sciences »
What causes Fenestral fabric?
Tubular fenestrae probably formed by burrowing organisms in soft, wet intertidal and/or shallow subtidal sediments. Irregular and laminoid fenestrae formed by desiccation/lithification in more frequently exposed sediments resulting in hard, indurated surfaces in tidal flats, which inhibited further burrowing.
How do you identify Micrites?
Micrite is “lime mud”, the dense, dull‐looking sediment made of Clay sized crystals of CaCO3. Micrite forms from the breakdown of calcareous algae skeletons. It is not clear if all ancient Micrites formed in the same way. Many Carbonates are composed of nearly 100% Micrite.
What is a micrite in geology?
Micrite, sedimentary rock formed of calcareous particles ranging in diameter from 0.06 to 2 mm (0.002 to 0.08 inch) that have been deposited mechanically rather than from solution.
What is micrite used for?
Submarine diagenesis. Micrite envelopes document a period of alteration concurrent with deposition. The micritized surfaces of grains commonly survive dissolution and provide a surface for later precipitation of cements.
What is blue chert?
Blue Chert is the diplomat, the analyst, always thinking things through before committing. If you have these traits, you will probably be drawn to Blue Chert simply because your energy is attracted to similar energies.