authigenic


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authigenic

(ˌɔːθɪˈdʒɛnɪk)
adj
(Geological Science) (of minerals) having crystallized in a sediment during or after deposition
[C19: from German authigene from Greek authigenēs native + -ic]
References in periodicals archive ?
It can form massive, either sedimentary or hydrothermal deposits (Hanor 2000; Griffith & Paytan 2012), but is also common as a dispersed authigenic mineral in marine sediments (Paytan et al.
For Lumshiwal Formation, both physical and chemical compaction, authigenic mineralization, cementation, and late stage dissolution are commonly observed, that included calcite, ferroan dolomite, kaolinite, illite and quartz overgrowth cements.
Some organic-rich rocks are enriched in authigenic uranium and hence they can be more radioactive (Schmoker, 1981; Meyer and Nederlof, 1984; Mann et al, 1986; Wignall and Myers, 1988; Stocks and Lawrence, 1990; Liming and Kolonie, 2003).
In a number of cases, these authigenic clays were found in fairly young craters, ones formed in the last 2 billion years or so.
The presence of palygorskite and sepiolite in the Tertiary sediments of the southern margin of Tethys has been related to their authigenic formation in shallow saline and At P/ET[degrees] values >0.
Crush resistance of frac sand is dependent upon hardness of grain; grain crystallinity; absence of weak planes that could have developed during tectonism; absence of deep pitting of grains, and absence of authigenic overgrowths on quartz grains (Zdunczyk, 2007), To reduce the presence of weaker grains, the ISO 13503-2 proppants standard for percent clusters is [less than or equal to] 1.
2005) and can be formed by either authigenic or diagenetic processes related to a chemical, physical, or biological change after its initial deposition.
If not fully removed, elements can precipitate as or become incorporated in authigenic minerals such as jarosite (K[Fe.
These processes mainly reflect interaction of the basaltic glass clasts and glass rich matrix with the percolating water, including palagonitization, formation of authigenic clays, zeolites and calcite (Kabesh et al.
The smaller, rounded, darker pellets of composite glauconite within these sandstone beds could have been transported from shallower shelf environment, with the surrounding lighter colored authigenic glauconite forming in-situ.
We made smear slides every 15 cm along the core and estimated percentages of clastic, authigenic, and biogenic components, organic matter, and aquatic amorphous organic matter to determine the core's composition and to establish where changes in the core's composition occurred.