نتایج جستجو برای: ultramafic composition
تعداد نتایج: 260684 فیلتر نتایج به سال:
The studied area is located in the north of Rudan city and is a part of Kahnuj - Rudan - Minab ophiolite belt. The studied rock are harzburgite and lherzolite and are composed of olivine, orthopyroxene, clinopyroxene and chrome – spinel (as a minor). According to microprobe data, the amount of MgO in the olivines ranges between %50.17 to %50.55, so these olivines are forsterite. Clinopyroxenes ...
Abstract The major-element chemical composition of garnet provides valuable petrogenetic information, particularly in metamorphic rocks. When facing detrital garnet, information about the bulk-rock and mineral paragenesis initial garnet-bearing host-rock is absent. This prevents application thermo-barometric techniques calls for quantitative empirical approaches. Here we present a discriminatio...
This work studies the potential release of Cr from solids to surface water and groundwater, related isotopic compositions, in a nickel laterite ore deposit Barro Alto Brazil (in State Goiás). ultramafic system is characterized by elevated concentrations chromium (Cr). Even largely immobile may be naturally leached weathering profiles such as groundwater. exploited for metal production, both min...
Hydrogen emissions from geothermal systems are well known, for example associated with mafic and ultramafic rock formations along mid-ocean ridges (MOR). Here we report concentrations H2 fields in Iceland that provides the only MOR on Earth exposes a largely submarine rift land compare them vent mid-Atlantic Ridge (MAR). The of Icelandic hydrothermal fluids 0.022–20.5 mmol/kg comparable to MAR ...
[1] Orbital images from the MESSENGER spacecraft show that ~27% of Mercury’s surface is covered by smooth plains, the majority (>65%) of which are interpreted to be volcanic in origin. Most smooth plains share the spectral characteristics of Mercury’s northern smooth plains, suggesting they also share their magnesian alkali-basalt-like composition. A smaller fraction of smooth plains interprete...
Microbial abundance and diversity in deep subsurface environments is dependent upon the availability of energy and carbon. However, supplies of oxidants and reductants capable of sustaining life within mafic and ultramafic continental aquifers undergoing low-temperature water-rock reaction are relatively unknown. We conducted an extensive analysis of the geochemistry and microbial communities r...
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