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- W2804234857 abstract "Abstract Evidence for the heterogeneity of the mantle's water content is generally acknowledged but it remains unclear if the variability of data is influenced by decompressional water loss. Here based on high water contents in peridotite, we explore if water gain may play a role. The study investigates water in abyssal peridotite by analyzing oriented orthopyroxene with polarized infrared radiation. Orthopyroxene from ODP‐Leg 153 (Mid‐Atlantic Ridge) contains 100 ppm more H 2 O (range: 220–323 ppm) than Leg 209 samples (range: 121–231 ppm). Possible explanations for high water concentrations are (1) water supply by gabbroic dykes, (2) reequilibration with ancient, H 2 O‐rich melts or melt‐derived fluid, (3) diffusional exchange between depleted peridotite and fertile rock volumes, or (4) high initial (premelting) water contents. Water in orthopyroxene is unrelated to the proximity of gabbroic dykes, and the inferred low H 2 O content of the latter renders possibility (1) unlikely. Possibilities (2) and (3) require that the rocks remained at mantle depth for an extended time span. This idea of a prolonged “mantle residence time” is corroborated by (i) literature data on isotopes and (ii) mantle equilibrium temperatures. Peridotite from Leg 153 reequilibrated at lower temperature (950–1,000°C) than Leg 209 peridotite (1,100–1,200°C) implying that more time elapsed between melt removal and exhumation—extending the time span for refertilization and explaining the its higher water content. The alternative that the measured concentrations are residual (4) requires high H 2 O amounts in original orthopyroxene (1,500 ppm) and peridotite (700 ppm)—values that are typical of an OIB‐source." @default.
- W2804234857 created "2018-06-01" @default.
- W2804234857 creator A5012628312 @default.
- W2804234857 creator A5063858169 @default.
- W2804234857 creator A5081964214 @default.
- W2804234857 date "2018-06-01" @default.
- W2804234857 modified "2023-09-25" @default.
- W2804234857 title "Water in Abyssal Peridotite: Why Are Melt-Depleted Rocks so Water Rich?" @default.
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- W2804234857 doi "https://doi.org/10.1029/2017gc007390" @default.
- W2804234857 hasPublicationYear "2018" @default.
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