Results 191 to 200 of about 388,584 (268)
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Fossilized Life in Subseafloor Ultramafic Rocks
Geomicrobiology Journal, 2018Ultramafic rocks are hypothesized to support a subseafloor hydrogen-driven biosphere because of extensive production of bioavailable energy sources like H2 or CH4 from fluid-rock interactions.
M. Ivarsson +4 more
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Plant formations on ultramafic rocks in New Caledonia
Botany Letters, 2022New Caledonia is known for the diversity of its geological substrates, which have shaped its highly original and diverse flora. Here, the effect of the soil on the vegetation is described for several contact zones between ultramafic and other substrates.
T. Jaffré
semanticscholar +1 more source
Plant mineral nutrition on ultramafic rocks of New Caledonia
Botany Letters, 2022In New Caledonia, the environmental heterogeneity on ultramafic rocks is a major driver of plant diversity. Here, the foliar mineral composition of numerous species was analysed to (1) explore plant mineral nutrition in different environments on ...
T. Jaffré
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Induced Polarization and Magnetic Responses of Serpentinized Ultramafic Rocks From Mid‐Ocean Ridges
Journal of Geophysical Research: Solid Earth, 2021The outcrops of ultramafic rock along mid‐ocean ridges experience variable extents of serpentinization related to tectonic and hydrothermal processes.
H. Chen +6 more
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Lichens and ultramafic rocks: a review
The Lichenologist, 2004Floristic, vegetational and ecological features of lichens in ultramafic environments are reviewed using a wide range of literature dating from the beginning of the 20th century. Co-presence of acidophytic (silicicolous) and basiphytic (calcicolous) species and the occurrence of species characterized by particular (disjunct) distribution patterns are ...
FAVERO LONGO, Sergio Enrico +2 more
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Geochimica et Cosmochimica Acta, 1953
Abstract Quantitative spectrochemical determinations of potassium in 50 specimens of ultramafic rock confirm the preliminary observation ( Ahrens , Pinson and Kearns , 1952) that the abundance of potassium in this rock type is much lower than has usually been assumed.
W Holyk, L.H Ahrens
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Abstract Quantitative spectrochemical determinations of potassium in 50 specimens of ultramafic rock confirm the preliminary observation ( Ahrens , Pinson and Kearns , 1952) that the abundance of potassium in this rock type is much lower than has usually been assumed.
W Holyk, L.H Ahrens
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Lunar Ultramafic Glasses, Chondrules and Rocks
Nature Physical Science, 1972Analysis of all samples returned by lunar missions before Apollo 15 has shown green glasses of ultramafic composition in soil and microbreccia samples. Ultramafic glasses in Apollos 11 and 14 and Luna 16 samples are rare and similar to each other in composition but different from any of the rocks collected at these sites.
T. E. BUNCH +4 more
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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
openaire +1 more source