نتایج جستجو برای: basaltic composition
تعداد نتایج: 261472 فیلتر نتایج به سال:
[1] A number of spectroscopic instruments with high resolution and complementary wavelength ranges, including TES, THEMIS, OMEGA, and CRISM, will give an unprecedented wealth of information about the surface of Mars. In order to maximize the utility of these data sets, they need to be joined to provide pan-spectral coverage of the surface of Mars that will give information on different types of...
The clinopyroxene composition of two types of alkaline and calc-alkaline gabbros at Piranshahr pluton was investigated in this study. The major oxides variations are similar in all clinopyroxenes of two types of gabbros and are classified as diopside- augite; but trace element compositions are very different in these two groups. The clinopyroxenes of alkaline gabbros are rich in high field stre...
Hezar complex is a part of Dehaj-Sarduiyeh volcano-plotunic belt in southwest of Rayen (Kerman province). Investigations on lava flows show that they have basalt, basaltic-trachy-andesite, trachy-andesite ,and trachy-basalt composition. On the basis of petrographic studies, the rocks contain plagioclase (Oligoclase - Andesine), pyroxene (Augite - Diopside) and much altered olivine. Plagioclases...
There are fragments of xenoliths in basaltic rocks of young volcanoes from Stromboli (Italy). They are oordierite bearing bUChite, having white colours and are in various sizes. The biggest fragment is around 20 '-"In long. The main minerals are cordierite. Around eithy percent of rocks composed of cordieritc and 20% consist of tridymite, hypersthene, sanidine and glass. Microscopic studie...
The pyroxene composition of basaltic rocks from the Coloured Series and Exotic blocks in the Neyriz area are discussed. Comparison has been made with equivalent rocks from Oman. The clinopyroxene compositions are in cognation with trace and rare-earth element analyses which definately confirm the occurrence of three different trends in basic lavas: I-Depleted tholeiite, 2-Transitional basal...
The initial ratios of neodymium-143 to neodymium-144 in kimberlites ranging in age between 90 x 10(6) to 1300 x 10(6) years from South Africa, India, and the United States are different from the corresponding ratios in the minerals of peridotite inclusions in the kimberlites but are identical to the ratios in the basaltic achondrite Juvinas at the times of emplacement of the respective kimberli...
Introduction: A strong early Martian greenhouse atmosphere is required to account for evidence of liquid water on the surface of Mars [e.g. 1]. Many models of Mars’ atmospheric evolution incorporate magmatic outgassing fluxes of CO2 based on analogy to terrestrial magmas [2-5]. Here we investigate the solubility of carbon dioxide in Martian analogue basaltic melts at 2.0 GPa to constrain this i...
The precise location and relative elevation of Spirit during its traverses from the Columbia Memorial station to Bonneville crater were determined with bundle-adjusted retrievals from rover wheel turns, suspension and tilt angles, and overlapping images. Physical properties experiments show a decrease of 0.2% per Mars solar day in solar cell output resulting from deposition of airborne dust, co...
Aims. The identification of other basaltic objects in the asteroid belt is mandatory to explain the diversity in the collection of basaltic meteorites. This diversity requires more than one differentiated parent body, a fact that is consistent with the diversity of differentiated parent bodies implied by the iron meteorites. Methods. Based on a list of previously identified candidate basaltic (...
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