FRINK Linked Data Fragments server

Matches in SemOpenAlex for { <https://semopenalex.org/work/W2328830054> ?p ?o ?g. }

• W2328830054 endingPage "734" @default.
• W2328830054 startingPage "703" @default.
• W2328830054 abstract "Peridotites exhumed in the footwall of axial detachment faults at slow-spreading ridges are highly serpentinized. Most mid-ocean ridge detachment settings are magmatically active and hydrous fluid circulation in and near the fault has been shown to be influenced by the presence of melt or magmatic lithologies. Our working area along the Southwest Indian Ridge (62–65°E) is nearly amagmatic and represents an end-member to study the hydrous alteration of exhumed peridotites without these magmatic influences. We use an integrated petrological approach combining microstructural, mineralogical and chemical observations to unravel the sequence of serpentinization in 272 dredged samples of variably serpentinized peridotites and to document the circulation of serpentinizing fluids in and near the exhumation faults. We find that serpentine recrystallization and veins overprint the initial serpentinite mesh texture in ∼25% of the samples. Oxygen isotope data suggest that this sequence developed at relatively high temperatures (271–336°C) and under increasing fluid–rock ratios, from near stoichiometry for mesh texture formation to >10 during recrystallization. Increasing fluid supersaturation relative to serpentine favors the replacement of mesh texture lizardite by chrysotile and polygonal or polyhedral serpentine. We attribute local recrystallization into antigorite to moderate Si-metasomatism, possibly following pyroxene serpentinization. We do not observe the more pronounced Si-metasomatism leading to talc replacing serpentine that is reported for the more magmatically active Mid-Atlantic Ridge detachment settings and is attributed to prior leaching of magmatic rocks. Scales of preferential fluid pathways in our samples evolved from pervasive and close-spaced (<500 µm) microfractures during the formation of the initial serpentine mesh texture, to centimeter-thick planar domains of enhanced fluid flux, spaced at ∼10 cm intervals and probably grouped in corridors that may be up to ∼100 m across. Serpentine minerals are enriched in some fluid-mobile elements (Cl, B, U) relative to the peridotite protolith, and several elements (Al, Fe, Si, Cu, As, Sb, REE) are redistributed at the millimeter to decimeter scale. Serpentinizing fluids were seawater-derived, probably mildly alkaline (small to no europium anomalies), reducing and H2-enriched (formation of magnetite). These fluids may have been similar to, though warmer than, those venting at the ultramafic-hosted Lost City hydrothermal fluid (30°N, Mid-Atlantic Ridge)." @default.
• W2328830054 created "2016-06-24" @default.
• W2328830054 creator A5025906433 @default.
• W2328830054 creator A5027034064 @default.
• W2328830054 creator A5039871223 @default.
• W2328830054 creator A5045130370 @default.
• W2328830054 creator A5062915518 @default.
• W2328830054 date "2015-04-01" @default.
• W2328830054 modified "2023-10-18" @default.
• W2328830054 title "Serpentinization and Fluid Pathways in Tectonically Exhumed Peridotites from the Southwest Indian Ridge (62-65 E)" @default.
• W2328830054 cites W1482706813 @default.
• W2328830054 cites W1489938111 @default.
• W2328830054 cites W1566213630 @default.
• W2328830054 cites W1634224673 @default.
• W2328830054 cites W1964187409 @default.
• W2328830054 cites W1964421696 @default.
• W2328830054 cites W1966942623 @default.
• W2328830054 cites W1971956559 @default.
• W2328830054 cites W1973000383 @default.
• W2328830054 cites W1973299642 @default.
• W2328830054 cites W1975633233 @default.
• W2328830054 cites W1975853595 @default.
• W2328830054 cites W1976868752 @default.
• W2328830054 cites W1982560803 @default.
• W2328830054 cites W1984254196 @default.
• W2328830054 cites W1984901396 @default.
• W2328830054 cites W1988606291 @default.
• W2328830054 cites W1988978036 @default.
• W2328830054 cites W1990367391 @default.
• W2328830054 cites W1993665248 @default.
• W2328830054 cites W1994679181 @default.
• W2328830054 cites W1996121269 @default.
• W2328830054 cites W1998356746 @default.
• W2328830054 cites W2006815492 @default.
• W2328830054 cites W2007408139 @default.
• W2328830054 cites W2007711398 @default.
• W2328830054 cites W2009231542 @default.
• W2328830054 cites W2013634682 @default.
• W2328830054 cites W2017264474 @default.
• W2328830054 cites W2019017051 @default.
• W2328830054 cites W2019175693 @default.
• W2328830054 cites W2020810253 @default.
• W2328830054 cites W2026411899 @default.
• W2328830054 cites W2027177435 @default.
• W2328830054 cites W2028603122 @default.
• W2328830054 cites W2033804331 @default.
• W2328830054 cites W2034058675 @default.
• W2328830054 cites W2039066042 @default.
• W2328830054 cites W2041528419 @default.
• W2328830054 cites W2042200137 @default.
• W2328830054 cites W2042202999 @default.
• W2328830054 cites W2055875329 @default.
• W2328830054 cites W2057493528 @default.
• W2328830054 cites W2057655240 @default.
• W2328830054 cites W2057955486 @default.
• W2328830054 cites W2058382324 @default.
• W2328830054 cites W2058953789 @default.
• W2328830054 cites W2065950359 @default.
• W2328830054 cites W2067431079 @default.
• W2328830054 cites W2068202901 @default.
• W2328830054 cites W2068360591 @default.
• W2328830054 cites W2072685698 @default.
• W2328830054 cites W2074306589 @default.
• W2328830054 cites W2075156900 @default.
• W2328830054 cites W2075731346 @default.
• W2328830054 cites W2076833330 @default.
• W2328830054 cites W2076996184 @default.
• W2328830054 cites W2079434554 @default.
• W2328830054 cites W2079704830 @default.
• W2328830054 cites W2080973789 @default.
• W2328830054 cites W2085747978 @default.
• W2328830054 cites W2087564946 @default.
• W2328830054 cites W2090090002 @default.
• W2328830054 cites W2094708105 @default.
• W2328830054 cites W2097274806 @default.
• W2328830054 cites W2100156053 @default.
• W2328830054 cites W2107710538 @default.
• W2328830054 cites W2110075944 @default.
• W2328830054 cites W2111968610 @default.
• W2328830054 cites W2113369720 @default.
• W2328830054 cites W2120507689 @default.
• W2328830054 cites W2125291350 @default.
• W2328830054 cites W2126907882 @default.
• W2328830054 cites W2129052331 @default.
• W2328830054 cites W2134934643 @default.
• W2328830054 cites W2137209139 @default.
• W2328830054 cites W2138551531 @default.
• W2328830054 cites W2154458308 @default.
• W2328830054 cites W2158140282 @default.
• W2328830054 cites W2159446523 @default.
• W2328830054 cites W2159932134 @default.
• W2328830054 cites W2160908072 @default.
• W2328830054 cites W2164220172 @default.
• W2328830054 cites W2166102005 @default.
• W2328830054 cites W2167590372 @default.
• W2328830054 cites W2169072530 @default.
• W2328830054 cites W2169426590 @default.
• W2328830054 cites W2315469448 @default.

• next