scholarly journals Water in Abyssal Peridotite: Why Are Melt-Depleted Rocks so Water Rich?

2018 ◽  
Vol 19 (6) ◽  
pp. 1824-1843 ◽  
Author(s):  
E. Schmädicke ◽  
J. Gose ◽  
R. Stalder
Keyword(s):  
Abyssal Peridotite

Mantle melting beneath Gakkel Ridge (Arctic Ocean): abyssal peridotite spinel compositions

2002 ◽  
Vol 182 (2-4) ◽  
pp. 227-235 ◽  
Author(s):  
Eric Hellebrand ◽  
Jonathan E Snow ◽  
Richard Mühe
Keyword(s):  
Arctic Ocean ◽  
Mantle Melting ◽  
Abyssal Peridotite ◽  
Gakkel Ridge

scholarly journals An assessment of upper mantle heterogeneity based on abyssal peridotite isotopic compositions

2009 ◽  
Vol 114 (B12) ◽  
Author(s):  
J. M. Warren ◽  
N. Shimizu ◽  
C. Sakaguchi ◽  
H. J. B. Dick ◽  
E. Nakamura
Keyword(s):  
Upper Mantle ◽  
Mantle Heterogeneity ◽  
Abyssal Peridotite ◽  
Isotopic Compositions

scholarly journals Abyssal peridotite osmium isotopic compositions from cr-spinel

2002 ◽  
Vol 3 (1) ◽  
pp. 1-24 ◽  
Author(s):  
J. J. Standish ◽  
S. R. Hart ◽  
J. Blusztajn ◽  
H. J. B. Dick ◽  
K. L. Lee
Keyword(s):  
Abyssal Peridotite ◽  
Isotopic Compositions

scholarly journals Abyssal Peridotite as a Component of Forearc Mantle: Inference from a New Mantle Xenolith Suite of Bankawa in the Southwest Japan Arc

Minerals ◽  
2018 ◽  
Vol 8 (11) ◽  
pp. 540 ◽  
Author(s):  
Shoji Arai ◽  
Akihiro Tamura ◽  
Makoto Miura ◽  
Kazuma Seike
Keyword(s):  
Alkali Basalt ◽  
Mantle Peridotite ◽  
Chromian Spinel ◽  
Abyssal Peridotite ◽  
Southwest Japan ◽  
Limited Sampling ◽  
Basalt Dike ◽  
Light Rare Earth Elements ◽  
Arc Magma ◽  
Forearc Mantle

Lithology and petrologic nature of the forearc mantle have been left unclear due to the very limited sampling to date. Here, we present petrological data on a forearc peridotite suite obtained as xenoliths in an alkali basalt dike (7.5 Ma) from the Bankawa area in the Southwest Japan arc for our better understanding of the forearc mantle. The host alkali basalt is of asthenosphere origin, and passed through a slab window with slight chemical modification by the slab-derived component. The Bankawa peridotite suite is comprised of lherzolites, which contain various amounts of secondary phlogopite and were metasomatized to various degrees. The least metasomatized lherzolite exhibits Fo91 of olivine, Cr/(Cr + Al) = 0.3 of chromian spinel, and depletion of middle to light rare-earth elements in clinopyroxene, and is overall similar to an abyssal lherzolite. It had originally formed at the proto-Pacific Ocean and then was trapped at a eastern margin of Eurasian continent by initiation of subduction. The forearc mantle peridotite formed as a residue of proto-arc magma formation is depleted harzburgite as represented by the peridotites obtained from the forearc seafloor, but can be less depleted abyssal peridotite if being devoid of partial melting or reaction with magmas after entrapment.

Redox controls on Ni–Fe–PGE mineralization and Re/Os fractionation during serpentinization of abyssal peridotite

2015 ◽  
Vol 150 ◽  
pp. 11-25 ◽  
Author(s):  
Dionysis I. Foustoukos ◽  
Michael Bizimis ◽  
Carl Frisby ◽  
Steven B. Shirey
Keyword(s):  
Abyssal Peridotite ◽  
Pge Mineralization

scholarly journals Petrogenesis of Neoproterozoic Ultramafic Rocks, Wadi Ibib–Wadi Shani, South Eastern Desert, Egypt: Constraints from Whole Rock and Mineral Chemistry

2021 ◽  
Vol 11 (22) ◽  
pp. 10524
Author(s):  
El Saeed R. Lasheen ◽  
Gehad M. Saleh ◽  
Farrage M. Khaleal ◽  
Mamdooh Alwetaishi
Keyword(s):  
Mineral Chemistry ◽  
Eastern Desert ◽  
Ultramafic Rocks ◽  
Abyssal Peridotite ◽  
Bulk Rock ◽  
Secondary Minerals ◽  
South Eastern ◽  
Temperature Ranges ◽  
Ophiolitic Rocks ◽  
Primary Minerals

This contribution deals with new geology, petrography, and bulk-rock/mineral chemistry of the poorly studied ultramafics of Wadi Ibib–Wadi Shani (WI–WS) district, South Eastern Desert, Egypt. These ultramafics are dismembered ophiolitic rocks that can be subdivided into serpentinites and serpentinized peridotites. Primary minerals such as olivine and pyroxene are absent in serpentinites, but relics of them occur in serpentinized peridotites. Pseudomorph after olivine is indicated by common hourglass textures with less mesh, whilst schistose bastites reflect a pyroxene pseudomorph. Chromite can be subdivided into Cr-spinel and Al-spinel. Cr-spinel ranges from chromite to magnesochromite in composition, whereas Al-spinel belongs to the spinel field. Cr-spinel includes YCr (Cr/(Cr+Al+Fe+3), YAl (Al/(Al+Cr+Fe+3), and YFe+3 (Fe+3/(Fe+3+Al+Cr), similar to forearc peridotite, whilst Al-spinel is more similar to abyssal peridotite, and may be formed during inanition of subduction processes in proto forearc environments. The main secondary minerals are tremolite, talc, and chlorite—which is subdivided into pycnochlorite and diabantite—and their temperature ranges from 174 to 224 °C. The examined rocks had undergone high partial melting degrees (>25%), as indicated by the Cr# of their unaltered cores (Cr-spinel, >0.6), whole rocks (Al2O3, SiO2, CaO, and MgO), trace and REEs, depleted Na2O, Al2O3, and Cr2O3 of clinopyroxene, and high forsterite content ((Fo = 100 Mg/Mg + Fe), av. 95.23 mol%), consistent with forearc settings.

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