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What is Wackestone in geology?
Wackestone is a type of limestone recognized in the Dunham (1962) Classification Scheme in which grains make up more than 10% of the rock but the grains are mud supported, i.e., the grains float in a mud matrix.
How is Wackestone formed?
Wackestone is limestone that consists mostly of hardened ooze with grains supported throughout the stone. In constrast, packstone has more grains that actually touch each other, forming a self-supporting framework containing hardened ooze only in the pores.
Where are Packstones found?
The mudstones and packstones are formed in deeper-water environments. Both grainstone units were likely deposited in carbonate shoals with the nested grainstones forming in slightly more-turbulent depositional environments.
What is a packstone in geology?
Under the Dunham classification (Dunham, 1962) system of limestones, a packstone is defined as a grain-supported carbonate rock that contains 1% or more mud-grade fraction.
Where are Grainstones found?
Pleistocene reef limestones, lagoonal packstone-wackestones, strandline grainstones, and calcretes are exposed in quarries and low sea cliffs along the Caribbean coast of the Yucatan Peninsula from the northern cape to Tulum (Fig. 7-1).
Where do Grainstones form?
Grainstone: Mud-free carbonate rocks, which are grain supported (Dunham, 1962). They generally are deposited in moderate- to high-energy environments, but their hydraulic significance can vary.
Is packstone a limestone?
packstone As defined by the Dunham classification, a limestone characterized by a grain-supported texture, together with a lime-mud matrix.
What type of rock is packstone?
muddy carbonate rock
Packstone: Grain-supported muddy carbonate rock (Dunham, 1962).
How do Grainstones form?
Dunham (1962) provided several suggestions for their origin: (1) they may be produced in high-energy, grain-productive environments where mud cannot accumulate, (2) they may be deposited by currents that drop out the grains and bypass mud to another area, or (3) they may be a product of winnowing of previously …
What is a Floatstone?
Definition of floatstone 1 : a light porous variety of opal occurring in concretionary masses. 2 : a bricklayer’s rubstone for smoothing gauged brickwork.
What are Oolids?
An ooid is a small spherical grain that forms when a particle of sand or other nucleus is coated with concentric layers of calcite or other minerals. Ooids most often form in shallow, wave-agitated marine water.
What is micrite made of?
Micrite is a limestone constituent formed of calcareous particles ranging in diameter up to four μm formed by the recrystallization of lime mud. Micrite is lime mud, carbonate of mud grade.
What are the characteristics of wackestone?
1. Wackestone Carbonate mud, micrite matrix-supported; skeletal grains (benthic foraminifers, gastropods) > 10%. 2. Wackestone Carbonate mud, micrite matrix-supported; skeletal grains (crinoids and sponge spicules, Tithonian, Upper Jurassic) > 10%. 3. Wackestone
What type of rock is winwackestone?
Wackestone is a matrix-supported carbonate rock that contains over 10% allochems in a carbonate mud matrix. This is part of the Dunham classification of carbonate rocks. In the other widely used classification due to Folk, an equivalent description would be, for example, an oopelmicrite, where the allochems in question are ooids and peloids.
What is packstone grain supported?
1. Packstone Grain-supported; carbonate mud matrix between skeletal grains (dasyclad algae, benthic foraminifers, bivalves) in interparticle pore space. Thin section kindly provided by T. Geel, Vrije Universiteit, Amsterdam
What is packstone made of?
Packstone Packstone of resedimented micritic ooids, aggregate grains and intraclasts. This packstone was depositied as a deep-water apron with ooids shed from a nearby platform margin. 6. Packstone/Grainstone Skeletal packstone-grainstone with gastropods and bivalves and micritic vadose meniscus cement followed by blocky sparite.