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Minerals 2019, 9(1), 61; https://doi.org/10.3390/min9010061

Abyssal Serpentinites: Transporting Halogens from Earth’s Surface to the Deep Mantle

Department of Earth and Environmental Sciences, University of Ottawa, Ottawa K1N 6N5, Canada
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Received: 3 December 2018 / Revised: 16 January 2019 / Accepted: 17 January 2019 / Published: 20 January 2019
(This article belongs to the Special Issue Serpentine Group Minerals)
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Abstract

Serpentinized oceanic mantle lithosphere is considered an important carrier of water and fluid-mobile elements, including halogens, into subduction zones. Seafloor serpentinite compositions indicate Cl, Br and I are sourced from seawater and sedimentary pore fluids, while F may be derived from hydrothermal fluids. Overall, the heavy halogens are expelled from serpentinites during the lizardite–antigorite transition. Fluorine, on the other hand, appears to be retained or may be introduced from dehydrating sediments and/or igneous rocks during early subduction. Mass balance calculations indicate nearly all subducted F is kept in the subducting slab to ultrahigh-pressure conditions. Despite a loss of Cl, Br and I from serpentinites (and other lithologies) during early subduction, up to 15% of these elements are also retained in the deep slab. Based on a conservative estimate for serpentinite thickness of the metamorphosed slab (500 m), antigorite serpentinites comprise 37% of this residual Cl, 56% of Br and 50% of I, therefore making an important contribution to the transport of these elements to the deep mantle. View Full-Text
Keywords: serpentinite; halogens; subduction; deep mantle serpentinite; halogens; subduction; deep mantle
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Pagé, L.; Hattori, K. Abyssal Serpentinites: Transporting Halogens from Earth’s Surface to the Deep Mantle. Minerals 2019, 9, 61.

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