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Carbonate dissolution during subduction revealed by diamond-bearing rocks from the Alps
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In this paper, the authors identify diamonds in ultrahigh-pressurerocks from the Italian western Alps that have an oceanic origin and assess the geochemistry of diamond-bearing ǫuidinclusions.Abstract:
.Carbon should therefore be retained in the slab and transportedto great depths in the mantle, rather than supply the arcvolcanoes. Here we identify diamonds in ultrahigh-pressurerocks from the Italian western Alps that have an oceanicorigin. We assess the geochemistry of diamond-bearing fluidinclusions and find that they contain bicarbonate, carbonateand sulphate ions, silica monomers, and crystals of carbonateand silicate. This fluid geochemistry indicates that carbon wasreleased from the slab at relatively shallow depths throughdissolution, not decarbonation. We conclude that dissolution,driven by fluids released from the subducted slab, is animportant mechanism for the transfer of carbon into themantle and ultimately back into the atmosphere, helping tobalance the carbon flux.read more
Citations
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Raman spectroscopy for fluid inclusion analysis
TL;DR: Raman spectroscopy is a versatile non-destructive technique for fluid inclusion analysis, with a wide field of applications ranging from qualitative detection of solid, liquid and gaseous components to identification of polyatomic ions in solution as mentioned in this paper.
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Reevaluating carbon fluxes in subduction zones, what goes down, mostly comes up.
TL;DR: Carbon fluxes in subduction zones can be better constrained by including new estimates of carbon concentration in subducting mantle peridotites, consideration of carbonate solubility in aqueous fluid along subduction geotherms, and diapirism of carbon-bearing metasediments.
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Metamorphic chemical geodynamics in continental subduction zones
TL;DR: In this paper, a review of the geochemical properties of UHP terranes is presented, focusing on the following issues in continental subduction zones: the time and duration of uHP metamorphism, the origin and action of metamorphic fluid/melt inside UHP slices, the element and isotope mobilities under HP to UHP conditions during continental collision, the origins of premetamorphic protoliths and its bearing on continental collision types, and the crustal detachment and crust mantle interaction in subduction channels.
Journal ArticleDOI
Element recycling from subducting slabs to arc crust: A review
Carl Spandler,Cassian Pirard +1 more
TL;DR: In this paper, a model to explain element transfer out of subducting slabs that involves serpentinite subduction and slab partial melting is presented, which is consistent with the geology of blueschist and eclogite-facies terranes and key geochemical and isotopic features of arc lavas.
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Ingassing, Storage, and Outgassing of Terrestrial Carbon through Geologic Time
TL;DR: Dasgupta et al. as discussed by the authors studied the evolution of the mantle carbon inventory over geologic time and found that the average residence time of carbon in the mantle is between 1 and 4 Ga, which is a reflection of carbon ingassing and outgassing rates throughout Earth's history.
References
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Journal ArticleDOI
Raman spectroscopy of amorphous, nanostructured, diamond-like carbon, and nanodiamond
Andrea C. Ferrari,John Robertson +1 more
TL;DR: It is shown how to use resonant Raman spectroscopy to determine structure and composition of carbon films with and without nitrogen, and the assignment of the peaks at 1150 and 1480 cm−1 often observed in nanodiamond.
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Computation of phase equilibria by linear programming: A tool for geodynamic modeling and its application to subduction zone decarbonation
TL;DR: In this article, an algorithm for the construction of phase diagram sections is formulated that is well suited for geodynamic problems in which it is necessary to assess the influence of phase transitions on rock properties or the evolution and migration of fluids.
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The Redox State of Earth's Mantle
TL;DR: In this article, the upper mantle oxygen fugacity at the top of the spinel peridotite rocks is shown to fall within 2 log units of the fayalite-magnetite-quartz (FMQ) oxygen buffer.
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A laser-based microanalytical method for the in situ determination of oxygen isotope ratios of silicates and oxides
TL;DR: In this paper, a new laser-based microanalytical method for oxygen isotope determinations of silicates and oxides has been developed whereby analyses are made on <100 μg samples or of in situ spot determinations.
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The chemistry of subduction-zone fluids
TL;DR: In this paper, it was shown that H2O-rich, Cl-poor, alkali-aluminosilicate-bearing fluid is fundamental to element transport in the mantle wedge.