Results 141 to 150 of about 2,033 (198)

Zircon behavior in the partially melted planetary mantle

open access: yes
Yakimenko A   +3 more
europepmc   +1 more source

Phlogopite from the Horoman Ultramafic Rocks

open access: yesPhlogopite from the Horoman Ultramafic Rocks
openaire  

Potassium in ultramafic rocks

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
openaire   +1 more source

Lichens and ultramafic rocks: a review

The Lichenologist, 2004
Floristic, 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 ...
Sergio E. FAVERO-LONGO   +2 more
openaire   +1 more source

Ultramafic and Related Rocks

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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Metamorphism of Ultramafic Rocks

1994
Ultramafic rocks are magnesium silicate rocks that normally contain no felsic minerals or very little (
Kurt Bucher, Martin Frey
openaire   +1 more source

An ultramafic rock in the precambrian of eastern Sinai

Geological Magazine, 1978
SummaryTwo small outcrops of harzburgite and asbestos-bearing serpentinite, occurring S of Di Zahav in eastern Sinai are the first record of ultramafic rocks from the Sinai Precambrian massif.
M. Beyth, H. Grunhagen, A. Zilberfarb
openaire   +1 more source

On the Origin of Ultramafic Rocks

Geological Society of America Bulletin, 1971
It 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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Alkali content of alpine ultramafic rocks

Geochimica et Cosmochimica Acta, 1965
The lower limit of abundance of sodium and potassium in ultramafic rocks is less than the threshold amount detectable by conventional analytical methods. By a dilutionaddition modification of the flame-spectrophotometric method, sodium and potassium have been determined in 40 specimens of alpine ultramafic rocks.
Warren Hamilton, Wayne Mountjoy
openaire   +1 more source

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