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 |
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.). Coquinite is the consolidated equivalent.
Where is micrite formed?
The fine grained carbonate sediment micrite may be precipitated chemically or biochemically from seawater, derived from the abrasion of pre-existing calcium grains, or form during disintegration of calcareous green algae (figure above).
What minerals are in micrite?
Micrite = lime mud; CaCO3, the mineral calcite. Micrite is the equivalent of clay (rock = shale) in clastics. Originally deposited as microscopic aragonite needles, but now converted to calcite and then calcite cemented to form the rock.
What is the depositional environment of conglomerate?
It takes a strong water current to transport and produce a rounded shape on particles this large. Wind transport is unlikely to produce a conglomerate. The environment of deposition might be along a swiftly flowing stream or a beach with strong waves.
Is micrite organic or inorganic?
Micrite consists of 1 to 4 μm-diameter crystals and forms as an inorganic precipitate or through breakdown of coarser carbonate grains.
What are the major sedimentary depositional environments?
There are 3 kinds of depositional environments, they are continental, marginal marine, and marine environments. Each environments have certain characteristic which make each of them different than others. And different depositional environment, will have different structure and texture of sediments.
What are 3 depositional landscapes?
Depositional landforms are the visible evidence of processes that have deposited sediments or rocks after they were transported by flowing ice or water, wind or gravity. Examples include beaches, deltas, glacial moraines, sand dunes and salt domes.
Can micrite have fossils?
Many limestones are so fine-grained that you cannot see any individual grains. If you are lucky, you may find fossils or fossil debris. Most marine micrites started as soft carbonate mud on the sea floor.
How sediments are deposited in sedimentary depositional environment?
Much sediment is deposited where rivers empty into lakes, or into the ocean. This is because the velocity of the stream current comes to a stop there, and as the flow slows down, the sediments being transported by the stream settle to the bottom and are deposited.