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 ?
Cement is siliciferous, the growth of authigenic quartz around detrital quartz grains is very common.
Argillaceous silt-stone had a high content of terrigenous detrital minerals and the interstitial materials were mainly made up of clay minerals and some amount of authigenic quartz.
However, there is uncertainty regarding a) whether the geochemical system is open or closed during diagenesis in sedimentary basins (Bjorkum & Gjelsvik, 1988; Bjorlykke & Jahren, 2010; Gluyas&Coleman, 1992; Sullivan et al., 1990; Worden & Barclay, 2000; Usman et al., 2018), and b) the origin and formation process of authigenic minerals, including clay minerals, and carbonate and quartz cements in sandstone (Barclay & Worden, 2000; Dowey, 2012;Worden & Morad, 2000).
In the two uppermost samples, only crystals of authigenic gypsum are entirely observed (Fig.
On the Pacific coast of Costa Rica, the seep sites known as Mound 11, Mound 12 and Jaco Scar are characterized by chemosynthethic macrofauna (clams, mussels, tube worms), authigenic carbonate rocks, and fine sediments (Furi et al., 2010).
Wang, "Climatic implication of authigenic minerals formed during pedogenic weathering processes," Earth Science, vol.
The samples contained a lot of honeycomb and flaky illite and smectite mixed layer, a small amount of needle-like chlorite and flake-flocculent chlorite and smectite mixed layer, and authigenic polyhedral quartz and strip albite crystal existing in particles.
Burley, "Distribution and origin of authigenic minerals in the Triassic Sherwood Sandstone Group, UK," Clay Mineralogy, vol.
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).
Both of these scenarios suggest that the clay minerals at these sites are likely "authigenic," meaning they formed in place sometime after impact occurred, rather than being excavated from underground.
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] 1.0.