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Showing 1 to 20 of 107 for “"Ultramafic"”.
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Geochemistry of the Twin Sister's Ultramafic Body, Washington
Made available in DSpace on 2014-12-04T19:14:25Z (GMT). No. of bitstreams: 1 6402886.pdf: 3653044 bytes, checksum: 964e63cf75809dcbaee8c7e75c5d60a8 (MD5) Previous issue date: 1963
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Ultramafic Alteration and the Cooling of Earth and Mars
This thesis deals with the influence of `ultramafic' rocks over the climate of planets. Ultramafic rocks, rich in Mg and Fe, are the most common rocks on Earth but exist primarily in the mantle and rarely outcrop on the surface. They are incredibly unstable under Earth's surface conditions where …
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Livadi Mafic-Ultramafic Complex and its metamorphic basement, N.E. Greece
… tectonic juxtaposition of the Livadi Mafic - Ultramafic Complex and the metamorphic lithologies of the Pelagonian basement, results from an involved history of deformation and metamorphism. The Pelagonian basement comprises a sequence of psammitic and pelitic clastics, frequently of arkosic …
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Origin of the Lunar Ultramafic Glasses Constrained by Experiments and Models
… further constraints on the origin of the lunar ultramafic glasses and the evolution of the lunar interior, phase equilibrium experiments are carried out on two synthetic compositions which represent hybridized, bulk source compositions of (1) high-titanium and (2) very low-titanium/high-aluminum …
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Geochemistry of peridotites and associated mafic rocks, Ronda ultramafic complex, Spain.
Thesis. 1978. Ph.D.--Massachusetts Institute of Technology. Dept. of Earth and Planetary Science.
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Rubidium-strontium analyses of ultramafic rocks and the origin of peridotites.
Massachusetts Institute of Technology. Dept. of Geology and Geophysics. Thesis. 1965. Ph.D.
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Fluid-rock interaction on alpine-type ultramafic rocks from the Norwegian Caledonides
Alpine-type ultramafic rocks are tectonically emplaced from mantle into the crust. Their petrological and structural alterations occur during their path from deep-seated sources to their crustal emplacement. Therefore, these rocks are suitable for the study of fluid-rock interaction during the syn- …
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Petrology and geochemistry of pyroxenites in the Lanzo ultramafic massif, Northwestern Italy
… are presented for pyroxenites in the Lanzo ultramafic massif in order to place chemical and petrological constraints both locally on the geologic history of the massif and more generally on the role of magmatic rifting and the rift-to-drift transition in ultraslow-spreading ridge …
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The lattice preferred orientation of olivine in Beni Bousera Ultramafic Massif, Morocco
… mantle processes and evolution. The Beni Bousera Ultramafic Massif, northern Morocco, shows petrologic evidence that melt was an important part of its history. The massif, dominantly composed of spinel lherzolite with harzburgitic sections, has 10 to 100 meter scale zones which contain abundant …
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Petrogenesis of the McClure Mountain mafic-ultramafic and alkalic complex, Fremont County Colorado
Call number: LD2668 .T4 1978 K53
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Emplacement history of mafic-ultramafic volcanic rocks in the northern Pontiac subprovince, Quebec, Canada
… matrix were observed along the contacts of mafic-ultramafic intrusions with their host sedimentary rocks. These textures are consistent with peperite, a rock formed by the mixing and mingling of magma with wet, unconsolidated sediments. Geochemical data for one of the peperites indicates that the …
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High tenor NI-PGE sulfide mineralization of the south manasan ultramafic intrusion, Thompson Nickel Belt, Manitoba
The South Manasan ultramafic intrusion (ca. 1880 Ma) located in the Early Proterozoic Thompson Nickel Belt (TNB) contains Ni and platinum group element (PGE) mineralization hosted by disseminated sulfide. Whole-rock Ni values range from 0.3 to 1.7 wt. % and total precious metals (TPMs) range from 0 …
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Surface detection of alkaline ultramafic rocks in semi-arid and arid terrains using spectral geological techniques
… into the spectral response of alkaline and other ultramafic rocks from arid and semi-arid regions. To date these rocks have not been investigated spectrally in a systematic fashion using the latest field and airborne imaging spectrometers. The objective was to determine how spectral geological …
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The Influence of Variable Oxygen Fugacity on the Source Depths for Lunar High-Titanium Ultramafic Glasses
… fugacity conditions on lunar high titanium ultramafic glasses to determine the conditions of multiple saturation where both olivine and orthopyroxene are stable on the liquidus. The investigated compositions are the Apollo 17 Orange glass (A17O, 9.1 wt.% TiO₂), Apollo 15 Red glass (A15R, …
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The contact relationship between an large orogenic ultramafic massif and its surrounding units: Beni Bousera northern Morocco
Thesis: S.B., Massachusetts Institute of Technology, Department of Earth, Atmospheric, and Planetary Sciences, 2009.
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Lichens Of Ultramafic Rocks: A Multidisciplinary Approach To Understanding The Ecology Of An Understudied Organism In A Well-Studied System
… life forms of metal-rich habitats, including ultramafic rocks and soils; however, research on lichens of ultramafic habitats is limited, especially on the North American continent. A review of the published literature on lichens of ultramafic substrates in North America yielded a total of 437 …
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