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| Breakdown of K-feldspar or mica grains by fresh water

...ect on gamma ray logs. The log shapes reflect shaliness, that is, clay and mica content of the sand. Because most sands reflect a hydrodynamic equilibrium, * ''Radioactive minerals'' in sands, especially K-feldspar, zircon, and mica, can raise sand readings as high as adjacent shales. Gamma ray logs may be

* Mica-derived kaolinite characterizes fluvial/distributary-channel sands flushed

...ref name=Reed_1977>Reed, M. G., 1977, Formation [[permeability]] damage by mica alteration and carbonate dissolution: Journal of Petroleum Technology, Sept

...les.<ref name=pt05r135>Reed, M. G., 1977, Formation permeability damage by mica alteration and carbonate dissolution: Journal of Petroleum Technology, Sept

| Elongate composite grains with straight borders; common mica inclusions

| Poor vertical permeability at upper to lower shoreface boundaries (e.g., mica plating) || || Lower shoreface sediments may be poorly swept; horizontal we ...PennWell Books, 1008 p.</ref> This behavior can be reinforced by a zone of mica concentration at the top of the lower shoreface, which acts as a baffle to

...fragments of unstable rock, and a little amount of other minerals such as mica and heavy minerals. Some feldspathic arenite have pink or red color because

...e more complex case of shaly sandstones with variable volumes of feldspar, mica, or carbonate material. This model can be solved using the graphical, linea The solution for the complex case of sandstones with feldspar, mica, and carbonate material was resolved after log analysts became comfortable

...ones rich in potassium-rich minerals such as potassium feldspar, muscovite mica, illite, or glauconite can give a high gamma response that is easily mistak ...enerally indicates the presence of minerals such as potassium feldspar and mica. Thorium is associated with the mineral monazite, a common heavy mineral in

There was an influx of [[quartz]]- and mica-rich [[Turbidite|turbiditic]] [http://dictionary.reference.com/browse/detri

...festoon-type cross-bedding ([[:file:M31F10v2.jpg|Figure 3G, H]]). A high [[mica]] content and transported organic debris along bedding planes are common in

...meability through increased grain packing and the bending and rupturing of mica and plastic [[deformation]] of ductile rock fragments and mud intraclasts.

...aveolitis. Organic dust may contain minerals such as quartz, feldspar and mica produced as a result of the abrasion action of the wind. These can get diss ...of health problem to man. It transports minerals such as quartz, feldspar, mica and particles of animal, vegetable and those of microbial origin. Its impac

...ment breakage, grain rotation, and sliding as well as deformation in clay, mica, and diagenetically altered feldspar grains.<ref name=Bernabeetal_1994>Bern

...and ductile grain deformation is common. Partial dissolution of chert and mica has created minor amounts of secondary porosity. Cements include mixed laye