What is authigenic sediment?
What is authigenic sediment?
authigenic sediment, deep-sea sediment that has been formed in place on the seafloor. The most significant authigenic sediments in modern ocean basins are metal-rich sediments and manganese nodules. Metal-rich sediments include those enriched by iron, manganese, copper, chromium, and lead.
What is the meaning of authigenic mineral?
In metamorphic petrology an authigenic mineral is one formed in situ during metamorphism, again by precipitation from fluids or recrystallization. For any mineral to be precipitated, the water must be oversaturated with respect to that mineral.
How is authigenic formed?
Commonly, authigenic mineral assemblages are a result of a series of dehydration and desilicification reactions during progressive burial. Examples are re- action of gypsum to anhydrite, goethite to hematite, opaline silica to quartz, smectite to illite, and trans- formation of zeolites to feldspars.
Which of the following mineral is authigenic?
Authigenic minerals, like calcite, halite, and gypsum, form in situ within the depositional site in response to geochemical processes.
What is a hydrogenous sediment?
Hydrogenous sediments include evaporites, meaning any type of sediment that forms from the evaporation of seawater. As seawater evaporates, the ions that remain behind can become so concentrated that they will combine with one another to form crystals that precipitate.
What is the source of terrigenous sediments?
Sources of terrigenous sediments include volcanoes, weathering of rocks, wind-blown dust, grinding by glaciers, and sediment carried by rivers or icebergs. Terrigenous sediments are responsible for a significant amount of the salt in today’s oceans.
Where are Biogenous sediments found?
The most important type of biogenous sediment comes from the tests of one-celled microscopic algae and protozoans living in the surface waters of the oceans.
What does Hydrogenous mean?
of or containing hydrogen
adjective. of or containing hydrogen. GOOSES. GEESES.
Where does Hydrogenous sediment come from?
Hydrogenous sediments come from chemical reactions in the water. Cosmogenous sediments come from space, filtering in through the atmosphere or carried to Earth on meteorites.
What is terrigenous sedimentary rocks?
Terrigenous clastic sedimentary rocks are composed of the detrital fragments of preexisting rocks and minerals and are conventionally considered to be equivalent to clastic sedimentary rocks in general. Because most of the clasts are rich in silica, they are also referred to as siliciclastic sedimentary rocks.
What is the meaning of terrigenous?
Definition of terrigenous : being or relating to oceanic sediment derived directly from the destruction of rocks on the earth’s surface.
What is Biogenous sediment?
Biogenous sediments are broadly defined as sediments consisting of large amounts of skeletal remains of macroscopic and microscopic organisms or remains of organic production.
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