EMODnet product catalogue
Sample locations, Ar-Ar ages and major and trace element and isotope compositions for igneous rocks dredged during the VESPA scientific cruise
The SW Pacific region contains several ridges and basins that are inferred to represent pre-Quaternary volcanic arcs and back-arc basins. The geology of these features is less well characterized than that of the active Tonga-Kermadec and Vanuatu arcs. We report new major and trace element, and Pb, Hf, Sr and Nd isotope data for 27 lavas dredged from the Loyalty and Three Kings ridges during the 2015 VESPA cruise of R/V l'Atalante. Low-K basalts were dredged from the seabed deeper than 3300 m, and high-K to shoshonitic suites from shallower ridge crests at 2000–3300 m. The samples are mainly basalts, with lesser trachybasalts, basaltic andesites, trachyandesites andesites, dacites, and one granite (anhydrous SiO2 and K2O + Na2O range from ~47 to 64 and 1.5 to 11 wt% respectively). Trace element patterns allow discrimination of three geochemical signatures, identified as i) depleted, ii) transitional and iii) enriched, based on their light to heavy rare earth element (REE) ratios (with La/Sm ranging from 0.4 to 8). Depleted and transitional samples are basalts, featuring REE concentrations similar to MORB, but with high field strength element and large ion lithophile element contents, typical of back-arc basin basalts. The most enriched samples are basaltic andesites, andesites, trachyandesites and trachytes with island arc magma trace element signatures. Pb isotope ranges are limited (208Pb/204Pb ~38 to 39.8, 207Pb/204Pb ~15.51 to 15.64 and 206Pb/~17.9 to 20.1), while Hf isotopes display more diverse compositions (eHf ranging from +7.7 to +14). Both Nd (eNd = 2.8–9.3) and Sr (87Sr/86Sr = 0.7026–0.7048) isotopes are correlated with Hf data. Trace element and isotopic compositions can be explained in terms of mixing between three distinct geochemical endmembers in the mantle resembling DMM, HIMU and EM-2 sources. Our study confirms voluminous subduction-related magmatism on the Loyalty and Three Kings ridges, mostly of Late Oligocene – Early Miocene age. The issue of polarity of subduction to generate these rocks remains open, but the composition-space-time distribution of the igneous rocks can be explained in the context of SW Pacific geodynamics using a west-dipping Pacific slab model.
Important Note: This submission has been initially submitted to SEA
scieNtific Open data Edition (SEANOE) publication service and received the recorded DOI.
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- Date (Creation)
- 2022-12-01
- Date (Revision)
- 2023-01-10
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- 2023-04-14
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- a53ad03f-3930-9303-3030-000000090050
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- DOI:10.17882/90050
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Agranier Arnaud, Patriat Martin, Mortimer Nick, Collot Julien, Etienne Samuel, Durance Patricia, Gans Phil, Chazot Gilles (2022). Sample locations, Ar-Ar ages and major and trace element and isotope compositions for igneous rocks dredged during the VESPA scientific cruise. SEANOE. https://doi.org/10.17882/90050
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Organisation name Individual name Electronic mail address Role SEA scieNtific Open data Edition Publisher Ifremer, Scientific Information Systems for the sea Dataset Holding Organisation Ifremer, Scientific Information Systems for the sea Author
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CC-BY 4.0
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- Oceans
- Begin date
- 2015-05-22
- End date
- 2015-06-17
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Name Version Documents 1
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Protocol Linkage Name WWW:DOWNLOAD-1.0-http--download
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COMMISSION REGULATION (EC) No 1205/2008 of 3 December 2008 implementing Directive 2007/2/EC of the European Parliament and of the Council as regards metadata
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- 2010-12-08
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See the referenced specification
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Corrigendum to INSPIRE Metadata Regulation published in the Official Journal of the European Union, L 328, page 83
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- 2010-12-08
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See the referenced specification
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Commission Regulation (EU) No 1089/2010 of 23 November 2010 implementing Directive 2007/2/EC of the European Parliament and of the Council as regards interoperability of spatial data sets and services
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- 2010-12-08
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- 2025-05-21T00:00:00
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ISO 19115:2003/19139
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1.0
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Organisation name Individual name Electronic mail address Role Geo-Ocean - UMR 6538 Point of contact
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