weathering and supergene alteration from the chemical and mineralogical point of view.
Supergene enrichment occurs at the base of the oxidized portion of an ore deposit.
Supergene processes include the predominance of meteoric water circulation with concomitant oxidation and chemical weathering .
Supergene processes include the predominance of meteoric water circulation with concomitant oxidation and chemical weathering.
Unlike the supergene, epistatic genes do not need to be closely linked or even on the same chromosome.
Volcanic rocks are divided into different groups according to their origin (lavas, debris flows and pyroclastic deposits) and the degree of alteration (hydrothermal and weathering).
We are working on spectral criteria (infrared absorption), which can be used to differentiate between certain minerals (phyllosilicates and opals) formed as a result of hydrothermal circulation and those formed as a result of supergene deterioration.
The duration, intensity and causes of this wildly different past surface environment remain poorly constrained, as do the processes involved (hydrothermal and supergene alteration), and how this primitive environment evolved.
The direct influence of shallow groundwater is responsible for supergene enrichment in recharge areas, and for the deposition of caliches and evaporites in discharge areas.
Requêtes fréquentes français :1-200, -1k, -2k, -3k, -4k, -5k, -7k, -10k, -20k, -40k, -100k, -200k, -500k, -1000k,
Requêtes fréquentes anglais :1-200, -1k, -2k, -3k, -4k, -5k, -7k, -10k, -20k, -40k, -100k, -200k, -500k, -1000k,
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