Hydrothermal Alteration and Alteration Types - Geology Science
2023年5月9日 · Argillic alteration typically occurs in the upper levels of a hydrothermal system, above the zone of phyllic alteration, and is often associated with porphyry copper and gold deposits. In addition to the formation of clay minerals, argillic alteration may also result in the formation of silica minerals, such as quartz and chalcedony, and the ...
Argillic alteration - Wikipedia
Argillic alteration is representative of supergene environments where low temperature groundwater becomes acidic. Argillic assemblages include kaolinite replacing plagioclase and montmorillonite replacing amphibole and plagioclase. Orthoclase is …
A selection of images of hydrothermally altered rock. (A) …
Argillic alteration. Plagioclase is replaced by illite (Fig. 6C) while biotite, and in some cases pyroxenes, are partially replaced by jarosite and minor alunite and Fe-oxides. These sulfates...
Microscopic images of alteration in thin sections: (a) …
The sulfur isotopic analysis of pyrite from the porphyry and epithermal mineralizations in the potassic alteration zone at Kaghdara and argillic alteration zone at Nowrozkala indicate that the ...
Argillic Horizon is a subsurface horizon with a significantly higher percentage of phyllosilicate clay than the overlying soil material. It shows evidence of clay illuviation. The argillic horizon forms below the soil surface, but it may be exposed at the surface later by …
The argillic alteration images prepared based on band ratio …
The main goal of this work is application of the spectrum-area fractal methodology based on the Landsat 8 OLI satellite images’ data for separation alteration zones for iron oxides at the Tarom...
Argillic Alteration | Below BC
Strong argillic altered rock. Small rectilinear casts, now finely crystalline-aligned, may be relict feldspars Dickite, Alunite, Kaolinite & Muscovite (Sericite)
Mapping hydrothermal alteration zones using ASTER images …
2021年6月1日 · Propylitic, phyllic, argillic, and silicification zones are recorded in different types of igneous and metamorphic rocks typically with chromite, goethite, ilmenite, galena and gold. Crosta and CEN techniques using ASTER are successfully applied to highlight the hydrothermal alteration zones and the structural elements represented by lithologic ...
Mineralogical, chemical and micromorphological studies of the argillic …
2015年1月1日 · False color images to ease localization, identification and quantification of minerals and mineral groups in fine-grained argillic alteration zones. The software (Adobe) is linked to the scanning electron microscope.
Argillic Horizons - an overview | ScienceDirect Topics
Argillic horizons are commonly observed under forest, with kandic horizons present in the more highly weathered soils or in those that formed on acidic parent materials; spodic horizons occur in coarse-textured soils dominated by coniferous or other vegetation that contributes large amounts of soluble fulvic acids to the soil surface.