Results 191 to 200 of about 36,744 (239)
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1972
The ultramafic rocks are composed mainly of dark-colored mafic or ferro-magnesian minerals such as olivine, pyroxene, amphibole, serpentine, garnet, biotite, and opaque oxides. They are usually, but not always, ultra-basic (having less than 45 percent SiO2).
Gunter Faure, James L. Powell
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The ultramafic rocks are composed mainly of dark-colored mafic or ferro-magnesian minerals such as olivine, pyroxene, amphibole, serpentine, garnet, biotite, and opaque oxides. They are usually, but not always, ultra-basic (having less than 45 percent SiO2).
Gunter Faure, James L. Powell
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Potassium and rubidium in ultramafic xenoliths
Geochimica et Cosmochimica Acta, 1970Abstract K and Rb contents of 13 ultramafic xenoliths and 6 specimens of associated basalt are presented. K Rb ratios of the xenoliths vary from about 60 to 600, while those of the hostbasalts lie in the narrower range of 200–340. Variation in the xenoliths may reflect mantle heterogeneity.
D.K. Paul, R. Hutchison
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Metamorphism of Ultramafic Rocks
1994Ultramafic rocks are magnesium silicate rocks that normally contain no felsic minerals or very little (
Kurt Bucher, Martin Frey
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Eos, Transactions American Geophysical Union, 1937
Introduction—The results of the work of several years are here presented in much condensed form. The material will be expanded at some late time into a more complete treatment of the problem. The broader factual data are set down in outline in the first section.
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Introduction—The results of the work of several years are here presented in much condensed form. The material will be expanded at some late time into a more complete treatment of the problem. The broader factual data are set down in outline in the first section.
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The ultramafic flora of Sabah: an introduction to the plant diversity on ultramafic soils
2014With over 3500 km2 of ultramafic rock outcrops in Sabah (4.6% of the total landmass of the state), Malaysia has one of the largest surface expressions of ultramafic rock, and one of the most species-rich floras occupying these outcrops, in the world.
van der Ent, Antony +3 more
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On the Origin of Ultramafic Rocks
Geological Society of America Bulletin, 1971It is argued that most alpine ultramafic bodies originated as cumulates in basic magma chambers high in the crust. From some of these chambers, magmas were intruded upward or extruded, leaving sill-like ultramafites behind. These were subsequently folded or dismembered by faulting, and, because of their high density, subsided during tectonism, to form ...
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1992
Ultramafic rocks comprise less than 0.1% of the New Zealand land surface but their occurrence in areas of contrasting climate and glacial history has produced a wide range of plant habitats. Compared with other New Zealand soils, ultramafic soils, ranging from deeply weathered laterites to youthful skeletal regoliths, have low concentrations of most ...
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Ultramafic rocks comprise less than 0.1% of the New Zealand land surface but their occurrence in areas of contrasting climate and glacial history has produced a wide range of plant habitats. Compared with other New Zealand soils, ultramafic soils, ranging from deeply weathered laterites to youthful skeletal regoliths, have low concentrations of most ...
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Ultramafic geoecosystems as a natural source of Ni, Cr, and Co to the environment: A review
Science of the Total Environment, 2021Jakub Kierczak +2 more
exaly
Plant–pollinator interactions in ultramafic and non-ultramafic environments in New Caledonia
Botany Letters, 2023Zakardjian, Marie +3 more
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