Results 131 to 140 of about 7,693 (174)
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A geochemically consistent hypothesis for MORB generation
Chemical Geology, 2000Abstract Geochemical observations of MORB including U-series disequilibria are used to examine the processes and timescales of MORB melt generation. Incompatible elements in MORB suggest that the MORB source region consists of a depleted lherzolite matrix interspersed with chemically enriched mafic veins.
James B Gill, Q Williams
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Chemical variations and regional diversity observed in MORB
Chemical Geology, 2010Abstract An assemblage of MORB analyses (n = 792 samples), including a suite of new, high-precision LA-ICP-MS measurements (n = 79), has been critically compiled in order to provide a window into the chemical composition of these mantle-derived materials and their respective source region(s), commonly referred to as the depleted MORB mantle (DMM ...
Ricardo Arévalo, William F Mcdonough
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Mineralogy and Petrology, 1987
Anhydrous partial melting experiments on four peridotite compositions have been conducted at 10 kbar providing a relatively internally consistent set of data on the character of primary melts expected from the oceanic upper mantle in the mid-ocean ridge setting.
Trevor J Falloon, Green D H
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Anhydrous partial melting experiments on four peridotite compositions have been conducted at 10 kbar providing a relatively internally consistent set of data on the character of primary melts expected from the oceanic upper mantle in the mid-ocean ridge setting.
Trevor J Falloon, Green D H
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Relationship between submarine MORB glass textures and atmospheric component of MORBs
Chemical Geology, 2003Abstract We investigated the relationship between noble gas signatures and sample textures among glassy fragments. Glassy MORB fragments were classified based on their texture. By handpicking under a binocular, they were divided into three groups: (1) heterogeneous “outer” part, (2) homogeneous “middle” part, and (3) “inner” neighbors of the ...
Hidenori Kumagai, Ichiro Kaneoka
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MORB: A Multi-Scale Binary Descriptor
2018 25th IEEE International Conference on Image Processing (ICIP), 2018Local image features play an important role in matching images under different geometric and photometric transformations. However, as the scale difference across views increases, the matching performance may considerably decrease. To address this problem we propose MORB, a multi-scale binary descriptor that is based on ORB and that improves the ...
Alessio Xompero +2 more
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Anomalously low sodium MORB magmas: Evidence for depleted MORB or analytical artifact?
Geochimica et Cosmochimica Acta, 1995Abstract One common characteristic of quenched natural basaltic glass is the presence of microcrystalline halos surrounding many microphenocrysts (spherulites). From our investigations of the composition of basaltic grasses in both quenched lavas and in plagioclase-hosted melt inclusions, we have discovered that quench halo portions of spherulites ...
Roger L. Nielsen +2 more
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ThSr isotopic relationships in MORB
Earth and Planetary Science Letters, 1992Abstract Although MORB are well known to exhibit a limited range in isotopic ratios such as 87Sr/86Sr, a compilation of existing (230Th/232Th) data, which reflect present Th/U in the source, shows a large dispersion. This is in contrast to the, admittedly limited, data available for oceanic islands, for which there is a broad correlation between 87Sr/
K.H. Rubin, J.D. Macdougall
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MORB degassing: evolution of CO2
Earth and Planetary Science Letters, 1989Abstract With the gas pressure model for the occurrence of volcanic eruptions of Jaupart, Vergniolle and Tait and the13C/12C Rayleigh fractionation model of Pineau and Javoy we can explain, using the results of our previous calculations on the nucleation and growth of bubbles in MORB, the observed quantities and isotopic ratios of carbon present in ...
Y. Bottinga, M. Javoy
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MORB degassing: Bubble growth and ascent
Chemical Geology, 1990Bubbles grow in upward-moving liquid basalt by diffusion and because of decompression. Transport equations for stationary and non-stationary multicomponent gas bubbles were solved numerically for the diffusion of CO2, H2O, He and Ar into bubbles under magmatic conditions at pressures ranging from 20 to 0.2 kbar.
Y. Bottinga, M. Javoy
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2023
This zip file contains data presented in the submission “Marine magnetic anomalies enhanced by internal stress in rapidly cooled submarine lavas” by Han et al., 2023. 1. Folder “Figure04 DATA” has one spreadsheet that contains all data plotted in Figure 4a–d. 2. Folder “Rockmagnetism” contains five subfolders.
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This zip file contains data presented in the submission “Marine magnetic anomalies enhanced by internal stress in rapidly cooled submarine lavas” by Han et al., 2023. 1. Folder “Figure04 DATA” has one spreadsheet that contains all data plotted in Figure 4a–d. 2. Folder “Rockmagnetism” contains five subfolders.
openaire +2 more sources