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Showing 1 to 19 of 19 for “"Serpentinite"”.
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Laboratory Electrical DC Resistivity of Serpentinite, Graphite, Oxide and Sulfide Minerals
… ilmenite, magnetite, pyrite, pyrrhotite and serpentinite was assessed using a Cryogen-Free Measurement System (CFMS) over a temperature range of 10K-300K. The objective of this work is to contribute to radar and Ground Penetrating Radar sensing data interpretation as electrical DC …
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Multifaced stone and ceramic moulds from Bronze Age Anatolia : building an analytical protocol of mould properties and behavior during the process of metal casting
… to systematize the study of multifaceted serpentinite bronze-casting moulds from Bronze Age Anatolia (ca. 3500-1700 B.C.). These moulds represent a class of metal processing tools that reflect material properties and perhaps also social concerns in their development and use. In phase I of …
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Physiological and Phylogenetic Studies of the Biogeography of Alkaliphilic Heterotrophic Bacteria from Serpentinizing Habitats
… of small organic compounds, such as methane. Serpentinite habitats contain abundant potential electron donors, but microorganisms presumably have limited accessibility to electron acceptors. A consequence of serpentinization is the production of highly alkaline (pH 10-12), highly reducing …
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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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The metamorphic sheet and underlying volcanic rocks beneath the Semail ophiolite in the northern Oman mountains of Arabia
… consists of sub-ophiolitic metamorphic rocks and serpentinite, alkaline and tholeiitic basalts (the Haybi volcanics), associated with mountain-sized "Exotic" limestones and an Upper Cretaceous sedimentary melange. The rocks of the Haybi complex are bounded by major thrust planes, the Semail thrust …
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The Geology of the Arakapas Fault Belt Area Troodos Massif, Cyprus
… All these rocks were later intruded by serpentinite and cut by a closely related system of normal and reverse east-west faults. The petrography and geochemistry of the APB area basalts is investigated and compared to those from the "normal spreading axis" northern part of the massif. The …
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Tectonic evolution of the Western Limassol Forest Complex, Cyprus
… complex has been sheared along E-W trending serpentinite shear zones, the orientation of which indicate sinistral displacement. The various styles of deformation from ductile to brittle, and the progressive cooling history of the Intrusive plutons and dykes indicate a history of about 4km of …
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Microbial communities, activities, and metabolisms in Earth’s subseafloor and analog oceanic environments
… that facilitate persistence in a submarine serpentinite-hosted system. Together, this work links microbial activity, function, and physiology with the geochemical conditions of the subseafloor, advancing our understanding of how life persists in Earth’s ceanic crust and informing ongoing …
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Geophysical and geochemical constraints on the evolution of oceanic lithosphere from formation to subduction
… in Chapter 4 I examine samples of cretaceous age serpentinite sampled just before subduction at the Puerto Rico Trench. I show that these upper mantle rocks were completely serpentinized under static conditions at the Mid-Atlantic Ridge. Further, they subsequently underwent 100 Ma of seafloor …
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Geophysical and geochemical constraints on the evolution of oceanic lithosphere from formation to subduction
… in Chapter 4 I examine samples of cretaceous age serpentinite sampled just before subduction at the Puerto Rico Trench. I show that these upper mantle rocks were completely serpentinized under static conditions at the Mid-Atlantic Ridge. Further, they subsequently underwent 100 Ma of seafloor …
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Nickel laterites, origin and climate
… formed by intense chemical weathering of a serpentinite protolith in a region with a high water table and relatively low topography, resulting in the formation of an oxide deposit. In addition silica precipitation is common in the upper horizons of the deposit, where it creates an indurated …
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Ridge segmentation, tectonic evolution and rheology of slow-spreading oceanic crust
… from laboratory deformation experiments on 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 …
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QUASI STATIC GRAVITY SIGNATURES IN SLOW TECTONIC ZONES: ASSIMILATION OF NOVEL AEROSPACE DATA AND GEOPHYSICAL MODELING
… in which the formation of oceanic crust and serpentinite due to the hydration of upwelling mantle peridotite is implemented, to simulate the evolution of the Gulf of Aden from the rift initiation to the development of an active oceanic spreading center. The thermo-mechanical analysis support …
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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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Caratterizzazione chimica e microstrutturale di minerali fibrosi ad alto impatto per l'inquinamento ambientale
… tremolite e actinolite) estratte dai campioni di serpentinite. Il principale scopo dello studio è stato quello di definire: i) la presenza di minerali dell’asbesto nell’area di studio, ii) i parametri morfometrici (morfologia, dimensioni) delle fibre in modo da identificare quelle respirabili e …
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Surface detection of alkaline ultramafic rocks in semi-arid and arid terrains using spectral geological techniques
… rocks including dunite, peridotite and serpentinite. The diagnostic spectrum in the SWIR2 region (2000nm to 2500nm) has absorption features located near 2300nm and 2380nm and results from Mg-OH bearing minerals including serpentine, talc and phlogopite.<br></br><br></br> The VNIR spectra …
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Livadi Mafic-Ultramafic Complex and its metamorphic basement, N.E. Greece
… the Livadi Mafic - Ultramafic Complex comprises serpentinite and metamorphosed dunite, harzburgite, lherzolite and gabbro, which tectonically overlie the Pelagonian metamorphics in a number of small thrust klippen. The thrust surface that originally connected these mafic-ultramafic 'outliers' is …
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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 …