Where is packstone 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.
Where are Grainstones found?
Grainstone is a grain-supported carbonate rock with little or no mud between the grains (Dunham, 1962). Grainstones that develop fitted fabrics are generally deposited in high-energy environments such as shoals, barrier bars and beaches or eolian settings, but not all such grainstones develop fitted fabrics.
How is packstone formed?
Dunham (1962) provided several scenarios for the origin of packstones: (1) they may be a product of compacted wackestones, (2) they may result from early or late mud infiltration of previously deposited mud-free sediments, (3) they may result from the prolific production of grains in calm water, or (4) they may record …
Where are carbonate depositional environments found?
Carbonate sand accumulations of reservoir size commonly occur near the seaward edge of banks, platforms, and shelves. Less commonly, they are formed within platform interiors and over topographically high areas within a regionally deep-water setting.
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.
What is Packstone rock?
A packstone is a carbonate rock that is grain-supported and have a matrix of micrite (lime mud). Grains (allochems) within a packstone are largely in contact with each other. The term packstone is part of the Dunham Classification of carbonate rocks.
What environments do carbonate rocks form?
Carbonate sediments originate on land and in the sea. They are formed in three major settings: On the conti- nents, within the transitional area between land and sea, and in the shallow and deep sea. Today only araund 10 % of marine carbonate production takes place in shallow seas.
Which rocks are carbonates?
Carbonate rocks are also a class of sedimentary rocks that are composed primarily of carbonate minerals. The two major types of carbonate rocks are limestone (CaCO3) and dolostone, primarily composed of the mineral dolomite (CaMg(CO3)2).
What is packstone rock?
What is the depositional environment of micrite?
Micrite
| Type | Sedimentary Rock |
|---|---|
| Composition | Calcite |
| Color | Black |
| Miscellaneous | Microcrystalline; Reacts with HCl; Hardness < Glass |
| Depositional Environment | Variable Depth Continental Shelf/Platform Marine |
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