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Showing 1 to 13 of 13 for “"Serpentinites"”.
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The Serpentinites and Related Rocks of Anglesey, North Wales, United Kingdom
Made available in DSpace on 2014-12-11T18:10:07Z (GMT). No. of bitstreams: 1 7412097.pdf: 14800162 bytes, checksum: 213c8f24897975acaad7c1030cf3f06c (MD5) Previous issue date: 1973
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Experimental investigation of the fluid driven carbonation of serpentinites and spinel-peridotites: implications for the carbon and trace element cycle in the forearc region of the mantle wedge
… on the reaction of slab-derived COH fluids with serpentinites and peridotites between 1-2.5 GPa and 375-750 °C. Powdered, natural serpentinite was used to establish the phase relations of the antigorite-CO2-H2O-system. Cylindrical cores of either natural serpentinite or peridotites are used as …
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Experimental investigation of the fluid driven carbonation of serpentinites and spinel-peridotites: implications for the carbon and trace element cycle in the forearc region of the mantle wedge
… on the reaction of slab-derived COH fluids with serpentinites and peridotites between 1-2.5 GPa and 375-750 °C. Powdered, natural serpentinite was used to establish the phase relations of the antigorite-CO2-H2O-system. Cylindrical cores of either natural serpentinite or peridotites are used as …
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Geology and Geochemistry of Muyexe Magnesite Deposit, Giyani Greenstone Belt, Limpopo Province, South Africa
… peridotite are intrusions within the rock. The serpentinites and peridotites were found to be the source rock for magnesite mineralization, while the peridotite is the source rock for serpentinites rocks. XRD analysis revealed that magnesite in the Muyexe magnesite deposit is associated with …
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Surface characterisation and flotation behaviour of the platinum and palladium arsenide, telluride and sulphide mineral species
… assemblage of rock types, with pyroxenites, serpentinites and calcsilicates being the most abundant. The predominant PGMs are the tellurides, arsenides, alloys and sulphides. The Pt and Pd tellurides contribute between 20-45% of the PGMs present in the Platreef ore followed by the alloys …
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Ridge segmentation, tectonic evolution and rheology of slow-spreading oceanic crust
… serpentinite. These experiments demonstrate that serpentinites are considerably weaker than peridotites or gabbros, display a non-dilatant style of brittle deformation, and strain is accommodated by shear cracking. Serpentinites may weaken the lithosphere, enhance strain localization along faults, …
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Surface textures on pyrope, picroilmenite and chrome diopside from Kimberlite
… from kimberlite, as well as a few garnet-bearing serpentinites. Although the relative abundance of kelyphite-encrusted garnet varies from one kimberlite to another, kelyphite shells are most commonly developed on mauve garnets which are most probably derived from peridotite and are least commonly …
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Novel Insights into the Palaeomagnetism of Serpentinized Peridotites from the Troodos and Oman Ophiolites
… that magnetization directions within the Troodos serpentinites are highly variable and include: (i) WNW-directed magnetizations that are inferred to have been acquired during early serpentinization on the seafloor during the Late Cretaceous, that QDM and associated rock magnetic analyses …
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Fluid-rock interaction on alpine-type ultramafic rocks from the Norwegian Caledonides
… greenschist facies conditions the formation of serpentinites is typical, and the formation of ophicarbonates only requires small amounts of CO2. With increasing temperature, the formation of talc-marbles requires higher CO2 amounts. In the brittle to ductile regime, fluid flow is mainly …
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Fluid-mobile element cycling (halogens, boron, lithium) and sourcing through the Costa Rican convergent margin
… of deeper fluid sources (altered oceanic crust, serpentinites, and mantle). Isotopic variabilities in springs on the Nicoya Peninsula, closest to the trench, result from either interaction between fluids and the host lithology, differences in fluid pathways due to faulting, or a combination of …
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The geochemistry of boron and lithium in mid -ocean ridge hydrothermal vent fluids
… likely due to low temperature reaction with serpentinites in the down flow zone.</p><p>The results for Li demonstrate that the delta7Li signature of high temperature hydrothermal fluids is remarkably constant with a global average value of 7.5 +/- 1.6‰. This contrasts the variability …
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From the Appalachians to the Alps: Constraints on the Timing, Duration, and Conditions of Metamorphism at Convergent Margins
… coherent units, aided by the presence of buoyant serpentinites.
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ΟΦΙΟΛΙΘΟΙ ΤΗΣ ΝΗΣΟΥ ΚΡΗΤΗΣ
ΟΙ ΟΦΙΟΛΙΘΟΙ ΤΗΣ ΝΗΣΟΥ ΚΡΗΤΗΣ ΑΠΑΝΤΟΥΝ ΩΣ ΤΕΜΑΧΗ ΕΝΟΣ ΔΙΑΜΕΛΙΣΜΟΥ ΟΦΙΟΛΙΘΙΚΟΥ ΣΥΜΠΛΕΓΜΑΤΟΣ, ΣΤΙΣ ΠΕΡΙΟΧΕΣ ΑΝΩΓΕΙΑ, ΣΠΗΛΙ, ΜΙΑΜΟΥ, ΚΑΜΑΡΕΣ, ΒΙΑΝΝΟ. ΚΑΤΑΛΑΜΒΑΝΟΥΝ ΕΚΤΑΣΗ 35 ΚΜ2 ΠΕΡΙΠΟΥ ΚΑΙ ΕΧΟΥΝ ΠΑΧΟΣ 300 Μ ΠΕΡΙΠΟΥ, ΕΙΝΑΙ ΔΕ ΑΝΩΙΟΥΡΑΣΙΚΗΣ ΗΛΙΚΙΑΣ. ΣΤΟ ΟΦΙΟΛΙΘΙΚΟ ΣΥΜΠΛΕΓΜΑ ΑΠΑΝΤΟΥΝ: 1) ΧΑΡΖΒΟΥΡΓΙΤΕΣ …