Results 41 to 50 of about 7,125 (231)

Experimental study and reaction path modeling of the carbonation of natural serpentinites [PDF]

arXiv, 2021
Mineralization of carbon dioxide is often seen as an attractive alternative to classical Carbon Capture and Storage (CCS) technologies, allowing the sequestration of \ce{CO2} as a solid mineral with no risk of aquifer contamination or leakage back to the atmosphere.
arxiv  

Devolatilization of Subducting Slabs, Part I: Thermodynamic Parameterization and Open System Effects [PDF]

Geochemistry, Geophysics,Geosystems, 20 (2019), 2019
The amount of H$_2$O and CO$_2$ that is carried into deep mantle by subduction beyond subarc depths is of fundamental importance to the deep volatile cycle but remains debated. Given the large uncertainties surrounding the spatio-temporal pattern of fluid flow and the equilibrium state within subducting slabs, a model of H$_2$O and CO$_2$ transport in ...
arxiv   +1 more source

Deformation and exhumation of the Ronda peridotite (Spain) [PDF]

Tectonics, 2013
The Ronda peridotite supplies one of the best objects to document subcontinental mantle deformation, but its internal deformation and exhumation mechanisms remain controversial. Here we provide new structural data and numerical results that constrain the Oligocene‐Miocene deformation history of the Ronda massif. We first describe a mantle shear zone in
Précigout, Jacques, Gueydan, Frédéric, Garrido, Carlos, Cogné, Nathan, Booth-Rea, Guillermo   +4 more
openaire   +6 more sources

THERMOBAROMETRY OF DEPLETED PERIDOTITES

Geodynamics & Tectonophysics
An assessment was made of the possibility of using olivine thermobarometry for xenoliths of depleted peridotites from the Udachnaya pipe (Yakutia), represented by 76 megacrystalline dunites and 5 megacrystalline harzburgites. Specially developed and tested method of microprobe analysis was used to determine Al and Ca microimpurities in the olivine ...
L. N. Pokhilenko, V. N. Korolyuk, N. P. Pokhilenko   +2 more
openaire   +2 more sources

Conversion of pyridoxal to pyridoxamine with NH3 and H2 on nickel generates a protometabolic nitrogen shuttle under serpentinizing conditions

The FEBS Journal, EarlyView.
Recent studies show that Ni0 catalyzes amino acid synthesis from 2‐oxoacids via reductive amination. We show that the cofactor pyridoxal is reductively aminated to pyridoxamine, the NH2‐transferring intermediate of transaminations, with NH3 (~ 5 mm) and H2 (5 bar) on Ni0 catalysts within hours in water under serpentinizing hydrothermal vent conditions (
Manon Laura Schlikker, Max Brabender, Loraine Schwander, Carolina Garcia Garcia, Maximillian Burmeister, Sabine Metzger, Joseph Moran, William F. Martin   +7 more
wiley   +1 more source

Ductile deformation during carbonation of serpentinized peridotite

Nature Communications, 2022
Mantle rocks can efficiently bind carbon by reaction with CO2 if fluid pathways remain open. This study of samples from Oman demonstrates that coupling of synchronous reaction and deformation facilitates fluid flow and massive carbon sequestration.
Manuel D. Menzel, Janos L. Urai, Estibalitz Ukar, Greg Hirth, Alexander Schwedt, András Kovács, Lidia Kibkalo, Peter B. Kelemen   +7 more
doaj   +1 more source

Experimental determination of ferric iron partitioning between pyroxene and melt at 100KPa [PDF]

arXiv, 2020
Pyroxene is the principal host of Fe$^{3+}$ in basalt source regions, hosting 79 and 81% of the Fe$^{3+}$ in spinel and garnet lherzolite, respectively, with opx and cpx hosting 48% and 31%, respectively, of the total Fe$^{3+}$ in spinel peridotite. To better understand partitioning of Fe$^{3+}$ between pyroxene and melt we conducted experiments at 100
arxiv  

Viscosity of anhydrous and hydrous peridotite melts

Chemical Geology, 2023
The melt viscosity (η) of anhydrous and hydrous peridotite was investigated using a multipronged approach combining micropenetration viscometry, conventional DSC, flash DSC and Brillouin spectroscopy. Raman spectroscopy measurements were used to verify the absence of crystallization and/or degassing during high-temperature measurements of these ...
Di Genova, Danilo, Bondar, Dmitry, Zandonà, Alessio, Valdivia, Pedro, Al-Mukadam, Raschid, Fei, Hongzhan, Withers, Anthony C., Boffa Ballaran, Tiziana, Kurnosov, Alexander, McCammon, Catherine, Deubener, Joachim, Katsura, Tomoo   +11 more
openaire   +2 more sources

In Situ Boron Isotope Determination in Amphibole by LA‐MC‐ICP‐MS: Matrix Effects and New Potential Reference Materials

Geostandards and Geoanalytical Research, EarlyView.
Key Points An analytical strategy for determining boron isotope ratios in Ca‐amphiboles using LA‐MC‐ICP‐MS is presented. Accurate δ11B results can be achieved using the USGS BHVO‐2G glass as the calibrating reference material. Two proposed Ca‐amphibole RMs exhibit good homogeneity with δ11B intermediate measurement precision of 2.86‰ and 3.96 (2s). The
Enrico Cannaò, Gianluca Sessa, Samuele Agostini, Massimo Tiepolo   +3 more
wiley   +1 more source

Origin of Ophiolitic Peridotites

Journal of Geography (Chigaku Zasshi), 1989
Origin of spinel peridotites of upper mantle derivation, especially that of ophiolitic peridotites, is discussed mainly on the basis of compositional relationship between olivine (Fo content) and chromian spinel (Cr/(Cr+Al) atomic ratio=Cr* ratio). Spinel peridotites are distributed in a relatively narrow band, the olivine-spinel mantle array, on the ...
openaire   +3 more sources