Geochemistry of serpentinized peridotites from ODP Holes 207-1272A and 207-1274A
Despite the key importance of altered oceanic mantle as a repository and carrier of light elements (B, Li, and Be) to depth, its inventory of these elements has hardly been explored and quantified. In order to constrain the systematics and budget of these elements we have studied samples of highly s...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.783681 2024-09-15T18:24:29+00:00 Geochemistry of serpentinized peridotites from ODP Holes 207-1272A and 207-1274A Vils, Flurin Pelletier, Laure Kalt, Angelika Müntener, Othmar Ludwig, Thomas MEDIAN LATITUDE: 15.396257 * MEDIAN LONGITUDE: -45.901496 * SOUTH-BOUND LATITUDE: 15.094430 * WEST-BOUND LONGITUDE: -46.676360 * NORTH-BOUND LATITUDE: 15.647780 * EAST-BOUND LONGITUDE: -44.971660 * DATE/TIME START: 2003-06-07T07:45:00 * DATE/TIME END: 2003-06-18T21:45:00 2008 application/zip, 11 datasets https://doi.pangaea.de/10.1594/PANGAEA.783681 https://doi.org/10.1594/PANGAEA.783681 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.783681 https://doi.org/10.1594/PANGAEA.783681 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess Supplement to: Vils, Flurin; Pelletier, Laure; Kalt, Angelika; Müntener, Othmar; Ludwig, Thomas (2008): The Lithium, Boron and Beryllium content of serpentinized peridotites from ODP Leg 209 (Sites 1272A and 1274A): Implications for lithium and boron budgets of oceanic lithosphere. Geochimica et Cosmochimica Acta, 72(22), 5475-5504, https://doi.org/10.1016/j.gca.2008.08.005 209-1272A 209-1274A DRILL Drilling/drill rig Joides Resolution Leg209 North Atlantic Ocean Ocean Drilling Program ODP dataset publication series 2008 ftpangaea https://doi.org/10.1594/PANGAEA.78368110.1016/j.gca.2008.08.005 2024-08-21T00:02:25Z Despite the key importance of altered oceanic mantle as a repository and carrier of light elements (B, Li, and Be) to depth, its inventory of these elements has hardly been explored and quantified. In order to constrain the systematics and budget of these elements we have studied samples of highly serpentinized (>50%) spinel harzburgite drilled at the Mid-Atlantic Ridge (Fifteen-Twenty Fracture zone, ODP Leg 209, Sites 1272A and 1274A). In-situ analysis by secondary ion mass spectrometry reveals that the B, Li and Be contents of mantle minerals (olivine, orthopyroxene, and clinopyroxene) remain unchanged during serpentinization. B and Li abundances largely correspond to those of unaltered mantle minerals whereas Be is close to the detection limit. The Li contents of clinopyroxene are slightly higher (0.44-2.8 µg/g) compared to unaltered mantle clinopyroxene, and olivine and clinopyroxene show an inverse Li partitioning compared to literature data. These findings along with textural observations and major element composition obtained from microprobe analysis suggest reaction of the peridotites with a mafic silicate melt before serpentinization. Serpentine minerals are enriched in B (most values between 10 and 100 µg/g), depleted in Li (most values below 1 µg/g) compared to the primary phases, with considerable variation within and between samples. Be is at the detection limit. Analysis of whole rock samples by prompt gamma activation shows that serpentinization tends to increase B (10.4-65.0 µg/g), H2O and Cl contents and to lower Li contents (0.07-3.37 µg/g) of peridotites, implying that-contrary to alteration of oceanic crust-B is fractionated from Li and that the B and Li inventory should depend essentially on rock-water ratios. Based on our results and on literature data, we calculate the inventory of B and Li contained in the oceanic lithosphere, and its partitioning between crust and mantle as a function of plate characteristics. We model four cases, an ODP Leg 209-type lithosphere with almost no igneous ... Other/Unknown Material North Atlantic PANGAEA - Data Publisher for Earth & Environmental Science ENVELOPE(-46.676360,-44.971660,15.647780,15.094430) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
209-1272A 209-1274A DRILL Drilling/drill rig Joides Resolution Leg209 North Atlantic Ocean Ocean Drilling Program ODP |
spellingShingle |
209-1272A 209-1274A DRILL Drilling/drill rig Joides Resolution Leg209 North Atlantic Ocean Ocean Drilling Program ODP Vils, Flurin Pelletier, Laure Kalt, Angelika Müntener, Othmar Ludwig, Thomas Geochemistry of serpentinized peridotites from ODP Holes 207-1272A and 207-1274A |
topic_facet |
209-1272A 209-1274A DRILL Drilling/drill rig Joides Resolution Leg209 North Atlantic Ocean Ocean Drilling Program ODP |
description |
Despite the key importance of altered oceanic mantle as a repository and carrier of light elements (B, Li, and Be) to depth, its inventory of these elements has hardly been explored and quantified. In order to constrain the systematics and budget of these elements we have studied samples of highly serpentinized (>50%) spinel harzburgite drilled at the Mid-Atlantic Ridge (Fifteen-Twenty Fracture zone, ODP Leg 209, Sites 1272A and 1274A). In-situ analysis by secondary ion mass spectrometry reveals that the B, Li and Be contents of mantle minerals (olivine, orthopyroxene, and clinopyroxene) remain unchanged during serpentinization. B and Li abundances largely correspond to those of unaltered mantle minerals whereas Be is close to the detection limit. The Li contents of clinopyroxene are slightly higher (0.44-2.8 µg/g) compared to unaltered mantle clinopyroxene, and olivine and clinopyroxene show an inverse Li partitioning compared to literature data. These findings along with textural observations and major element composition obtained from microprobe analysis suggest reaction of the peridotites with a mafic silicate melt before serpentinization. Serpentine minerals are enriched in B (most values between 10 and 100 µg/g), depleted in Li (most values below 1 µg/g) compared to the primary phases, with considerable variation within and between samples. Be is at the detection limit. Analysis of whole rock samples by prompt gamma activation shows that serpentinization tends to increase B (10.4-65.0 µg/g), H2O and Cl contents and to lower Li contents (0.07-3.37 µg/g) of peridotites, implying that-contrary to alteration of oceanic crust-B is fractionated from Li and that the B and Li inventory should depend essentially on rock-water ratios. Based on our results and on literature data, we calculate the inventory of B and Li contained in the oceanic lithosphere, and its partitioning between crust and mantle as a function of plate characteristics. We model four cases, an ODP Leg 209-type lithosphere with almost no igneous ... |
format |
Other/Unknown Material |
author |
Vils, Flurin Pelletier, Laure Kalt, Angelika Müntener, Othmar Ludwig, Thomas |
author_facet |
Vils, Flurin Pelletier, Laure Kalt, Angelika Müntener, Othmar Ludwig, Thomas |
author_sort |
Vils, Flurin |
title |
Geochemistry of serpentinized peridotites from ODP Holes 207-1272A and 207-1274A |
title_short |
Geochemistry of serpentinized peridotites from ODP Holes 207-1272A and 207-1274A |
title_full |
Geochemistry of serpentinized peridotites from ODP Holes 207-1272A and 207-1274A |
title_fullStr |
Geochemistry of serpentinized peridotites from ODP Holes 207-1272A and 207-1274A |
title_full_unstemmed |
Geochemistry of serpentinized peridotites from ODP Holes 207-1272A and 207-1274A |
title_sort |
geochemistry of serpentinized peridotites from odp holes 207-1272a and 207-1274a |
publisher |
PANGAEA |
publishDate |
2008 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.783681 https://doi.org/10.1594/PANGAEA.783681 |
op_coverage |
MEDIAN LATITUDE: 15.396257 * MEDIAN LONGITUDE: -45.901496 * SOUTH-BOUND LATITUDE: 15.094430 * WEST-BOUND LONGITUDE: -46.676360 * NORTH-BOUND LATITUDE: 15.647780 * EAST-BOUND LONGITUDE: -44.971660 * DATE/TIME START: 2003-06-07T07:45:00 * DATE/TIME END: 2003-06-18T21:45:00 |
long_lat |
ENVELOPE(-46.676360,-44.971660,15.647780,15.094430) |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Supplement to: Vils, Flurin; Pelletier, Laure; Kalt, Angelika; Müntener, Othmar; Ludwig, Thomas (2008): The Lithium, Boron and Beryllium content of serpentinized peridotites from ODP Leg 209 (Sites 1272A and 1274A): Implications for lithium and boron budgets of oceanic lithosphere. Geochimica et Cosmochimica Acta, 72(22), 5475-5504, https://doi.org/10.1016/j.gca.2008.08.005 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.783681 https://doi.org/10.1594/PANGAEA.783681 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1594/PANGAEA.78368110.1016/j.gca.2008.08.005 |
_version_ |
1810464844473696256 |