Chemical Weathering of the Mafic Minerals Serpentine and Olivine in Natural Environments
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Does Olivine Indicates Dry Conditions on Mars?
The existence of liquid water on Mars has been hotly debated, especially following the discovery of the mineral olivine [(Mg,Fe) 2 SiO 4 ] in several regions of the planet by the latest Mars missions. Olivine, a greenish magnesium/ iron orthosilicate common in mafic rocks, has been claimed to indicate spatially limited chemical weathering [1-3] because it readily evolves to iddingsite, goethite...
متن کاملبررسی کانی شناسی مجموعه اولترامافیک – مافیک رزدر (جنوب استان کرمان)
Razdar ultramafic–mafic complex is located in south of Kerman province and contains ultramafic (dunite with chromitite, lherzolite, wehrlite, websterite and olivine websterite) and mafic (gabbro) rocks. The most important minerals in this complex are olivine, chromospinel, orthopyroxene, clinopyroxene, plagioclase and amphibole. Mineralogical studies indicate that chemical composition of these ...
متن کاملFormation of H(2) and CH(4) by weathering of olivine at temperatures between 30 and 70 degrees C
Hydrocarbons such as CH4 are known to be formed through the Fischer-Tropsch or Sabatier type reactions in hydrothermal systems usually at temperatures above 100°C. Weathering of olivine is sometimes suggested to account for abiotic formation of CH4 through its redox lowering and water splitting properties. Knowledge about the CH4 and H2 formation processes at low temperatures is important for t...
متن کاملChemistry of mafic minerals and thermobarometry of Bazman Quaternary volcanic rocks
Abstract 1-Introduction Bazman volcano is located on Chgay - Makran magmatic arc. This magmatic arc with east-west trend is 500 km long and 150 km wide and extends from southeastern Iran to southwestern Pakistan. Early evolution of the Makran zone from the upper Oligocene to the upper Miocene is characterized by turbidite sediments deposited on the oceanic crust. There are several quaternary...
متن کاملدگرسانی کانیها در دو بستر سنگی متفاوت و خاک حاصل از آنها در ناحیهی لاهیجان
Microscopical studies were carried out, in addition to physico-chemical and mineralogical analysis, in order to evaluate the effect of parent material and weathering on soil genesis in forest regions of Lahijan. Two representative soil pedons in mountain landform developed on granite and andesitic basalt located about 8 km southeast of Lahijan were selected and sampling were taken from each hor...
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