catagenesis


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Related to catagenesis: kerogen

catagenesis

 [kat″ah-jen´ĕ-sis]
involution or retrogression.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

in·vo·lu·tion

(in'vō-lū'shŭn),
1. Return of an enlarged organ to normal size.
2. Turning inward of the edges of a part.
3. In psychiatry, mental decline associated with advanced age.
Synonym(s): catagenesis
[L. in-volvo, pp. -volutus, to roll up]
Farlex Partner Medical Dictionary © Farlex 2012

in·vo·lu·tion

(in'vŏ-lū'shŭn)
1. Return of an enlarged organ to normal size.
2. Turning inward of the edges of a part.
3. psychiatry Mental decline associated with advanced age.
Synonym(s): catagenesis.
[L. in-volvo, pp. -volutus, to roll up]
Medical Dictionary for the Health Professions and Nursing © Farlex 2012
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References in periodicals archive ?
At the same time, within the range of catagenesis stages cyclicity is observed in the changes of both geochemical parameters, one of which ([[delta].sup.13]C) in fact fixes the catagenesis stages of the Bazhenov Suite organic matter, the other (Eu) reflects, apparently, the intensity of catagenesis products interaction with the mineral component of sediments with the changing of the oxidation-reduction environment in the sedimentary rock masses in the process of catagenesis [11].
Notwithstanding the author's reluctantly positive sense of catagenesis, the world model he has created here is not only unstable, but is actually in perpetual disequilibrium.
At greater depths, microbial action decreases as thermogenic production increases with the onset of catagenesis (subsequent to diagenesis at shallower depths [8]).
Vitrinite reflectance values indicate mature to overmature organic matter in the catagenesis stage (1.61-3.7%; Table 2), suggesting oil-generation to gas-generation window.