authigenic वाक्य
उदाहरण वाक्य
मोबाइल
- Common sedimentary authigenic minerals include calcium carbonate, apatite, and clays.
- This mode of preservation is known as authigenic mineralisation.
- Weddellite occurs as authigenic crystals in sea floor mud.
- In sediments it occurs as authigenic, diagenetic minerals and as a product of hydrothermal deposition.
- Faujasite occurs in vesicles within basalt and phonolite lava and tuff as an alteration or authigenic mineral.
- It was found that further chemical pre-treatment steps are required to completely remove authigenic uranium from sediments.
- They also have localized areas of lithified seafloor, generally authigenic carbonates but sometimes more exotic minerals such as barite are present.
- A key feature of this process, and exemplified by the reaction, is the production of a suite of by products which are precipitated as authigenic phases.
- These authigenic carbonates are known to be the most 13 C depleted carbonates on Earth, with ? 13 C values as low as-125 per mil PDB reported.
- These released elements form authigenic quartz, chert, calcite, dolomite, ankerite, hematite and albite, all trace to minor ( except quartz ) minerals found in shales and other mudrocks.
- Kastner's research expertise is in marine geochemistry; early research focused on the origin of authigenic feldspars and of zeolites in oceanic sediments, the opal-A and the control of dolomite formation.
- In order to calculate reliable comminution ages, authigenic uranium must be removed from the surface and pores of silicate minerals . used an etching procedure to evaluate the completeness of existing sample pre-treatment procedures.
- There is a clear relationship between known hydrocarbon discoveries at great depth in the Gulf slope and chemosynthetic communities, hydrocarbon seepage, and authigenic minerals including carbonates at the seafloor ( Sassen et al ., 1993a and b ).
- In benthic marine areas with strong methane releases from fossil reservoirs ( e . g . at cold seeps, mud volcanoes or gas hydrate deposits ) AOM can be so high that chemosynthetic organisms like filamentous sulfur bacteria ( see Beggiatoa ) or animals ( clams, tube worms ) with symbiont sulfide-oxidizing bacteria can thrive on the large amounts of hydrogen sulfide that are produced during AOM . The production of bicarbonate from AOM can result in the precipitation of calcium carbonate or so-called authigenic carbonates.
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