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searching for Mineral alteration 7 found (15 total)

Geological history of Mars (1,796 words) [view diff] exact match in snippet view article find links to article

an alternative Martian timescale based on the predominant type of mineral alteration that occurred on Mars due to different styles of chemical weathering

Bentonite (4,357 words) [view diff] exact match in snippet view article find links to article

rhyolite, dacite) present in the ash into clay minerals. In the mineral alteration process, a large fraction (up to 40–50 wt.%) of amorphous silica is

Sericitic alteration (74 words) [view diff] exact match in snippet view article find links to article

Sericitic alteration or sericitization is a process of mineral alteration caused by hydrothermal fluids invading permeable country rock. Plagioclase feldspar

Stream load (785 words) [view diff] exact match in snippet view article find links to article

carry some type of dissolved load. This type of load can result from mineral alteration from chemical erosion, or may even be the result of groundwater seepage

Porphyry copper deposit (2,801 words) [view diff] exact match in snippet view article find links to article

pebble dikes. The deposits typically have an outer epidote – chlorite mineral alteration zone. A quartz – sericite alteration zone typically occurs closer

Noachian (5,082 words) [view diff] exact match in snippet view article find links to article

outcroppings of Lower Noachian rocks showing spectral signatures of mineral alteration by water. (CRISM and HiRISE images from the Mars Reconnaissance Orbiter)

Geologic time scale (9,395 words) [view diff] exact match in snippet view article find links to article

time periods (millions of years ago) A second time scale based on mineral alteration observed by the OMEGA spectrometer on-board the Mars Express. Using