authigenic


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authigenic

[¦ȯ·thə¦jen·ik]
(geology)
Of constituents that came into existence with or after the formation of the rock of which they constitute a part; for example, the primary and secondary minerals of igneous rocks.
References in periodicals archive ?
Jordan samples from Arcadia, in Trempealeau County, Wisconsin, show originally rounded quartz grains with second-stage rounding of quartz overgrowths indicative of multi-cycling, and authigenic feldspar overgrowths that result in localized compromises to optimal frac sand properties (Runkel and Steenberg, 2012).
The granular and tubular bioalteration textures are fossilized and preserved by precipitation and encrustation of alteration products as authigenic clay minerals and iron oxides (Thorseth et al.
Zeolites are abundant and widespread authigenic minerals formed from volcanic glass and various rock-forming minerals by interaction with aqueous solutions in a wide variety of geochemical environments, in particular, as alteration products of aluminosilicates (Mumpton, 1977).
This paper documents the presence of oil seeps in the Southern Straits of Florida and provides new data on the sedimentary features, the sources of organic carbon an nitrogen based on stable isotopes, the diversity and density of surficial fauna, and the petrographic characteristics of seep-related authigenic carbonates.
The SEM micrographs (11A-F) showing altered ophiolite clasts partially coated by authigenic serpentine, talc (C), clay minerals (D) and well developed rhombohedral dolomite crystals (E,F).
Although others have examined the differences in calcium carbonate dissolution among biogenic and authigenic minerals, and the differences in available surface area (Cubillas et al.
The obtained data from Lake Verevi show that in the studied sheltered littoral area, where the sediment profiles consist of authigenic carbonates, siliciclastic suspended matter from the open area of the lake, and autochthonous organic matter, the sedimentation rates differ up to two times between adjacent sites in a relatively flat-bottomed area.
2010, Methane-derived authigenic carbonates from active hydrocarbon seeps of the St.
Based on geochemical data, the authors interpreted these magnetic phases as authigenic products, probably formed from pyrite clumps originated in the very reducing post-impact environment.
Detrial and authigenic feldspars in Permain and Early Triassic Sandstones, Eastern Alps.