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RidgeFactory-Slow
Ridge Factory Slow : Fluid-rock interactions in the context of mantle exhumation at slow spreading ridges. Study of a melt-poor end-member.
FunderFrench National Research Agency (ANR)
Funder Contribution €448,092.00
DurationFrom 01 Oct 2018
Project codeANR-18-CE01-0002
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title: Ridge Factory Slow : Fluid-rock interactions in the context of mantle exhumation at slow spreading ridges. Study of a melt-poor end-member Mid-ocean ridges can be viewed as factories that continuously manufacture new oceanic lithosphere that is then recycled into the mantle at subduction zones. This involves hydrothermal exchanges of heat and matter with the Ocean, contributing to the background, long-term exchanges between the solid Earth and its fluid envelopes. At slow spreading ridges (and some distal continental margins), the new seafloor is commonly made of tectonically exhumed mantle, and hydrothermal reactions lead to the hydration of the peridotites (serpentinization), to the release of substantial volumes of hydrogen and methane, to the formation of high pH fluids and to the crystallization of carbonates, and of condensed reduced carbon compounds in the serpentinized basement. We propose to work with the data from 2 recent oceanographic cruises in order to contribute to a better understanding of these processes, by focusing on the end member case of the melt-poor slow-spreading eastern Southwest Indian Ridge. keywords : mid-ocean ridge, hydrothermal circulation, tectonic exhumation of mantle-derived rocks, serpentinization, carbonation, fluids-rocks and microbes, seismic refraction, microseismicity, plate boundary, numerical models Partners : IPGP and ISTEP (Sorbonne University) Requested funding : 478 332 € Start date : fall 2018. Duration 48 months
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title: Ridge Factory Slow : Fluid-rock interactions in the context of mantle exhumation at slow spreading ridges. Study of a melt-poor end-member Mid-ocean ridges can be viewed as factories that continuously manufacture new oceanic lithosphere that is then recycled into the mantle at subduction zones. This involves hydrothermal exchanges of heat and matter with the Ocean, contributing to the background, long-term exchanges between the solid Earth and its fluid envelopes. At slow spreading ridges (and some distal continental margins), the new seafloor is commonly made of tectonically exhumed mantle, and hydrothermal reactions lead to the hydration of the peridotites (serpentinization), to the release of substantial volumes of hydrogen and methane, to the formation of high pH fluids and to the crystallization of carbonates, and of condensed reduced carbon compounds in the serpentinized basement. We propose to work with the data from 2 recent oceanographic cruises in order to contribute to a better understanding of these processes, by focusing on the end member case of the melt-poor slow-spreading eastern Southwest Indian Ridge. keywords : mid-ocean ridge, hydrothermal circulation, tectonic exhumation of mantle-derived rocks, serpentinization, carbonation, fluids-rocks and microbes, seismic refraction, microseismicity, plate boundary, numerical models Partners : IPGP and ISTEP (Sorbonne University) Requested funding : 478 332 € Start date : fall 2018. Duration 48 months
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