The water content of olivines from the North Atlantic Volcanic Province

Bjørn Jamtveit; Richard Brooker; Kent Brooks; Lotte Melchior Larsen; Tom Pedersen

doi:10.1016/S0012-821X(01)00256-4

The water content of olivines from the North Atlantic Volcanic Province

Bjørn Jamtveit, Richard Brooker, Kent Brooks, Lotte Melchior Larsen, Tom Pedersen

Department of Mapping and Mineral Resources

Research output: Contribution to journal › Article › Research › peer-review

91 Citations (Scopus)

Abstract

The water content of olivine crystals from picrites and basalts from the North Atlantic Volcanic Province has been estimated using non-polarised Fourier transform infrared spectra. H₂O concentrations vary from about 18 ppm by weight to below the detection limit of ca. 0.5 ppm. The most H₂O-poor olivines (≤ 0.5 ppm H₂O) probably reflect olivine crystallisation or re-equilibration at shallow crustal levels, possibly after magma degassing. However, some of the Mg-rich olivines (Fo_87-91.5) have elevated H₂O contents (3-7 ppm) and indicate the presence of mantle source regions with > 300 ppm H₂O for any reasonable crystallisation depth. The elevated H₂O content may be sufficiently high to significantly affect the mantle viscosity and melting behaviour and thus contribute to the simultaneous production of melt over a vast area from Baffin Island to the British Isles at 58-62 Ma.

Original language	English
Pages (from-to)	401-415
Number of pages	15
Journal	Earth and Planetary Science Letters
Volume	186
Issue number	3-4
DOIs	https://doi.org/10.1016/S0012-821X(01)00256-4
Publication status	Published - 15 Apr 2001

Keywords

FTIR
North Atlantic Volcanic Province
Olivine
Water content

Programme Area

Programme Area 4: Mineral Resources

Access to Document

10.1016/S0012-821X(01)00256-4

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title = "The water content of olivines from the North Atlantic Volcanic Province",

abstract = "The water content of olivine crystals from picrites and basalts from the North Atlantic Volcanic Province has been estimated using non-polarised Fourier transform infrared spectra. H2O concentrations vary from about 18 ppm by weight to below the detection limit of ca. 0.5 ppm. The most H2O-poor olivines (≤ 0.5 ppm H2O) probably reflect olivine crystallisation or re-equilibration at shallow crustal levels, possibly after magma degassing. However, some of the Mg-rich olivines (Fo87-91.5) have elevated H2O contents (3-7 ppm) and indicate the presence of mantle source regions with > 300 ppm H2O for any reasonable crystallisation depth. The elevated H2O content may be sufficiently high to significantly affect the mantle viscosity and melting behaviour and thus contribute to the simultaneous production of melt over a vast area from Baffin Island to the British Isles at 58-62 Ma.",

keywords = "FTIR, North Atlantic Volcanic Province, Olivine, Water content",

author = "Bj{\o}rn Jamtveit and Richard Brooker and Kent Brooks and Larsen, {Lotte Melchior} and Tom Pedersen",

note = "Funding Information: We are grateful to Mike Carroll, formerly at the University of Bristol, for advice and access to the FTIR, to Karl Gr{\o}nvold, Brian Upton, and Regin Waagstein for providing samples, to Godfrey Fitton for helpful advice, to Friedel Rauch for access to preliminary data for NRA analysis, and to J. Dixon and two anonymous reviewers for numerous helpful critical comments. The results on GGU material are published with the permission of the Geological Survey of Denmark and Greenland. Finally, we acknowledge support from Arnt Wilhelms and Erling V{\aa}gnes at Norsk Hydro who funded the project. [FA] ",

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AU - Brooker, Richard

AU - Brooks, Kent

AU - Larsen, Lotte Melchior

AU - Pedersen, Tom

N1 - Funding Information: We are grateful to Mike Carroll, formerly at the University of Bristol, for advice and access to the FTIR, to Karl Grønvold, Brian Upton, and Regin Waagstein for providing samples, to Godfrey Fitton for helpful advice, to Friedel Rauch for access to preliminary data for NRA analysis, and to J. Dixon and two anonymous reviewers for numerous helpful critical comments. The results on GGU material are published with the permission of the Geological Survey of Denmark and Greenland. Finally, we acknowledge support from Arnt Wilhelms and Erling Vågnes at Norsk Hydro who funded the project. [FA]

PY - 2001/4/15

Y1 - 2001/4/15

N2 - The water content of olivine crystals from picrites and basalts from the North Atlantic Volcanic Province has been estimated using non-polarised Fourier transform infrared spectra. H2O concentrations vary from about 18 ppm by weight to below the detection limit of ca. 0.5 ppm. The most H2O-poor olivines (≤ 0.5 ppm H2O) probably reflect olivine crystallisation or re-equilibration at shallow crustal levels, possibly after magma degassing. However, some of the Mg-rich olivines (Fo87-91.5) have elevated H2O contents (3-7 ppm) and indicate the presence of mantle source regions with > 300 ppm H2O for any reasonable crystallisation depth. The elevated H2O content may be sufficiently high to significantly affect the mantle viscosity and melting behaviour and thus contribute to the simultaneous production of melt over a vast area from Baffin Island to the British Isles at 58-62 Ma.

AB - The water content of olivine crystals from picrites and basalts from the North Atlantic Volcanic Province has been estimated using non-polarised Fourier transform infrared spectra. H2O concentrations vary from about 18 ppm by weight to below the detection limit of ca. 0.5 ppm. The most H2O-poor olivines (≤ 0.5 ppm H2O) probably reflect olivine crystallisation or re-equilibration at shallow crustal levels, possibly after magma degassing. However, some of the Mg-rich olivines (Fo87-91.5) have elevated H2O contents (3-7 ppm) and indicate the presence of mantle source regions with > 300 ppm H2O for any reasonable crystallisation depth. The elevated H2O content may be sufficiently high to significantly affect the mantle viscosity and melting behaviour and thus contribute to the simultaneous production of melt over a vast area from Baffin Island to the British Isles at 58-62 Ma.

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The water content of olivines from the North Atlantic Volcanic Province

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Keywords

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