Chlorine concentration and isotopic data for sediments and serpentine seamount material from ODP Legs 125, 129, 185, and 195

Chlorine isotope ratios were determined for volcanic gas, geothermal well, ash, and lava samples along the Izu-Bonin-Mariana volcanic front, serpentinite clasts and muds from serpentine seamounts (Conical, South Chamorro, Torishima), basalts from the Guguan cross-chain, and sediments from Ocean Drilling Program (ODP) Sites 800, 801, 802, and 1149. There is no systematic variation in d37Cl values along the volcanic front in either gas or ash samples. In contrast, distinct variations occur across the arc, implying variations in the fluid source at different depths within the subduction zone. Serpentinite clasts and serpentine muds from the seamounts tap a source of ~30 km depth and have d37Cl values of structurally bound chloride of +0.4 per mil +/- 0.4 per mil (n = 24), identical to most seafloor serpentinites, suggesting a serpentinite (chrysotile and/or lizardite to antigorite transition) fluid source. Tapping deeper levels of the subduction zone (~115-130 km depth), volcanic gases and ashes have d37Cl values averaging -1.1 per mil +/- 1.0 per mil (n = 29), precisely overlapping the range measured in sediments from ODP cores (-1.1 per mil +/- +0.7 per mil, n = 11) and limited altered oceanic crust (AOC). Both sediments and AOC are possible Cl sources in the volcanic front. The Guguan cross-chain basalts come from the greatest depths and have an average d37Cl value of +0.2 per mil +/- 0.2 per mil (n = 3), suggesting a second serpentine-derived source, in this case from antigorite breakdown at ~200 km depth.

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Barnes, Jaime D, Sharp, Zachary D, Fischer, Tobias (2008). Dataset: Chlorine concentration and isotopic data for sediments and serpentine seamount material from ODP Legs 125, 129, 185, and 195. https://doi.org/10.1594/PANGAEA.721795

DOI retrieved: 2008

Additional Info

Field Value
Imported on November 30, 2024
Last update November 30, 2024
License CC-BY-3.0
Source https://doi.org/10.1594/PANGAEA.721795
Author Barnes, Jaime D
Given Name Jaime D
Family Name Barnes
More Authors
Sharp, Zachary D
Fischer, Tobias
Source Creation 2008
Publication Year 2008
Resource Type application/zip - filename: Barnes_2008
Subject Areas
Name: Lithosphere

Related Identifiers
Title: Chlorine isotope variations across the Izu-Bonin-Mariana arc
Identifier: https://doi.org/10.1130/G25182A.1
Type: DOI
Relation: IsSupplementTo
Year: 2008
Source: Geology
Authors: Barnes Jaime D , Sharp Zachary D , Fischer Tobias .

Title: Basic preparation and analytical procedures (Data repository)
Identifier: ftp://rock.geosociety.org/pub/reposit/2008/2008226.pdf
Type: DOI
Relation: References