Mass transfer into the leading edge of the mantle wedge: Initial results from Oman Drilling Project Hole BT1B

Kelemen, P. B.; Obeso, Juan Carlos de; Leong, James Andrew; Godard, Marguerite; Okazaki, Keishi; Kotowski, Alissa; Manning, Craig E.; Ellison, Eric T.; Menzel, Manuel D.; Urai, János L.; Hirth, Greg; Rioux, Matthew; Stöckli, Daniel F.; Lafay, Romain; Beinlich, Andreas; Coggon, J. A.; Warsi, Nehal H.; Matter, Juerg M.; Teagle, D. A. H.; Michibayashi, Katsuyoshi; Takazawa, Eiichi; Sulaimani, Zaher Al; Harris, Michelle

doi:10.1002/essoar.10507370.1

Cited by 10 publications

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“…These decarbonation reactions are possible for both the metamorphic sole and Hawasina sediments. The modelling approach of Kelemen et al (2021) suggests that fluids derived from the sole and clastic Hawasina metasediments will have enough dissolved carbon to react with peridotite and result in magnesite-quartz rocks, the characteristic listvenite assamblage. However, if fluids derived from the sole are the source of the carbon, admixing of a different fluid derived from Hawasina metasediments is required to explain the 87 Sr/ 86 Sr measured in the listvenites.…”

Section: Fluid Source For Carbonation Of Peridotites In Oman Dp Hole ...mentioning

confidence: 99%

“…Below 150 m, 87 Sr/ 86 Sr values are relatively constant with increasing depth, until the second serpentine band at 181-186 m. Below the basal thrust, 87 Sr/ 86 Sr values are significantly lower in the metamorphic sole from 0.704 to 0.706, followed by lower 87 Sr/ 86 Sr values with greater depths (Figure2). Although the metamorphic sole contains meta-basalts(Godard et al, 2021;Kelemen et al, 2021;Kotowski et al, 2021;Searle & Malpas, 1980),…”

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Deep Sourced Fluids for Peridotite Carbonation in the Shallow Mantle Wedge of a Fossil Subduction Zone: Sr and C Isotope Profiles of OmanDP Hole BT1B

et al. 2022

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Completely carbonated peridotites represent a window to study reactions of carbon‐rich fluids with mantle rocks. Here, we present details on the carbonation history of listvenites close to the basal thrust in the Samail ophiolite. We use samples from Oman Drilling Project Hole BT1B, which provides a continuous record of lithologic transitions, as well as outcrop samples from listvenites, metasediments, and metamafics below the basal thrust of the ophiolite. 87Sr/86Sr of listvenites and serpentinites, ranging from 0.7090 to 0.7145, are significantly more radiogenic than mantle values, Cretaceous seawater, and other peridotite hosted carbonates in Oman. The Hawasina sediments that underlie the ophiolite, on the other hand, show higher 87Sr/86Sr values of up to 0.7241. δ13C values of total carbon in the listvenites and serpentinites range from −10.6‰ to 1.92‰. We also identified a small organic carbon component with δ13C as low as −27‰. Based on these results, we propose that during subduction at temperatures above >400°C, carbon‐rich fluids derived from decarbonation of the underlying sediments migrated updip and generated the radiogenic 87Sr/86Sr signature and the fractionated δ13C values of the serpentinites and listvenites in core BT1B.

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Section: Fluid Source For Carbonation Of Peridotites In Oman Dp Hole ...mentioning

confidence: 99%

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confidence: 99%

Deep Sourced Fluids for Peridotite Carbonation in the Shallow Mantle Wedge of a Fossil Subduction Zone: Sr and C Isotope Profiles of OmanDP Hole BT1B

et al. 2022

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“…The upper 6 meters are composed of alluvial gravels followed by an ultramafic sequence comprised of listvenites (carbonated peridotites) interlayered with two serpentinite bands (80-100 m depth and 181 to 186 m depth). A thick (0.42 m) layer of grey-green fault gouge at 196.6 m-197.1 m depth separates the ultramafic units from the metamorphic sole composed of fine-grained metabasalts (Godard et al, 2021;Kelemen et al, 2021;. To the first order, alteration of peridotite to form serpentinite and listvenite in Hole BT1B was nearly isochemical except for the addition of H2O and CO2.…”

Section: Omandp Hole Bt1b and Oman Listvenitesmentioning

confidence: 99%

“…The core provides a unique record of the interaction between peridotites in the leading edge of the mantle wedge and hydrous fluids rich in CO2. For an expanded version of the geology of Oman DP Hole BT1B and MoD mountain we refer the reader to the Proceedings of the Oman Drilling Project and Kelemen et al (2021).…”

Section: Omandp Hole Bt1b and Oman Listvenitesmentioning

confidence: 99%

“…This, combined with the radiogenic 87 Sr/ 86 Sr composition of OM20-17, suggests that a single fluid could be responsible for carbonation of the peridotites. We test this scenario using the reaction path proposed by Kelemen et al (2021). Their model generates a fluid with ~14,000 ppm carbon at 400°C and 1GPa from decarbonation of a rock with composition such as OM20-17.…”

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Deep sourced fluids for peridotite carbonation in the shallow mantle wedge of a fossil subduction zone: Sr and C isotope profiles of OmanDP Hole BT1B

ObesoiD

Kelemen

Leong

et al. 2021

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HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.

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Dual carbonate clumped isotopes (Δ47-Δ48) constrains kinetic effects and timescales in peridotite-associated springs at The Cedars, Northern California

Parvez

Lucarelli

Matamoros

et al. 2023

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The Cedars is an area in Northern California with a chain of highly alkaline springs resulting from CO-charged meteorological water interacting with a peridotite body. Serpentinization resulting from this interaction at depth leads to the sequestration of various carbonate minerals into veins accompanied by a release of Ca and OH enriched water to the surface, creating an environment which promotes rapid precipitation of CaCO at surface springs. This environment enables us to apply the recently developed Δ-Δ dual clumped isotope analysis to probe kinetic isotope effects (KIEs) and timescales of CO transformation in a region with the potential for geological CO sequestration. We analyzed CaCO recovered from various localities and identified significant kinetic fractionations associated with CO absorption in a majority of samples, characterized by enrichment in Δ values and depletion in Δ values relative to equilibrium. Surface floes exhibited the largest KIEs (ΔΔ: 0.163‰, ΔΔ: -0.761‰). Surface floe samples begin to precipitate out of solution within the first hour of CO absorption, and the dissolved inorganic carbon (DIC) pool requires a residence time of >100 hours to achieve isotopic equilibria. The Δ/Δ slope of samples from the Cedars (-3.223±0.519; 1 SE) is within the range of published theoretical values designed to constrain CO hydrolysis-related kinetic fractionation (-1.724 to -8.330). The Δ/δO slope (-0.009±0.001) and Δ/δC slope (0.009±0.001) are roughly consistent with literature values reported from a peridotite in Oman of -0.006±0.002 and -0.005±0.002, respectively. The consistency of slopes in the multi-isotope space suggests the Δ-Δ dual carbonate clumped isotope framework can be applied to study CO-absorption processes in applied systems, including sites of interest for geological sequestration.

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Mass transfer into the leading edge of the mantle wedge: Initial results from Oman Drilling Project Hole BT1B

Cited by 10 publications

References 0 publications

Deep Sourced Fluids for Peridotite Carbonation in the Shallow Mantle Wedge of a Fossil Subduction Zone: Sr and C Isotope Profiles of OmanDP Hole BT1B

Deep Sourced Fluids for Peridotite Carbonation in the Shallow Mantle Wedge of a Fossil Subduction Zone: Sr and C Isotope Profiles of OmanDP Hole BT1B

Deep sourced fluids for peridotite carbonation in the shallow mantle wedge of a fossil subduction zone: Sr and C isotope profiles of OmanDP Hole BT1B

Dual carbonate clumped isotopes (Δ47-Δ48) constrains kinetic effects and timescales in peridotite-associated springs at The Cedars, Northern California

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