Catalogue PIGMA
Argon/Argon, micropaleontological and Uranium/Lead geochronological data for igneous and sedimentary rocks dredged during the VESPA scientific cruise
Abstract: The 2015 VESPA voyage (Volcanic Evolution of South Pacific Arcs) was a seismic and rock dredging expedition to the Loyalty and Three Kings Ridges and South Fiji Basin. In our paper we present 33 40Ar/39Ar, 22 micropaleontological, and two U/Pb ages for igneous and sedimentary rocks from 33 dredge sites in this little-studied part of the southwest Pacific Ocean. Igneous rocks include basalts, dolerites, basaltic andesites, trachyandesites, and a granite. Successful Ar/Ar dating of altered and/or low-K basalts was achieved through careful sample selection and processing, detailed petrographic and element mapping of groundmass, and incremental heating experiments on both phenocryst and groundmass separates to interpret the complex spectra produced by samples having multiple K reservoirs. The 40Ar/39Ar ages of most of the sampled lavas, irrespective of composition, are latest Oligocene to earliest Miocene (25-22 Ma); two are Eocene (39-36 Ma). The granite has a U/Pb zircon age of 23.6±0.3 Ma. 40Ar/39Ar lava ages are corroborated by microfossil ages from associated sedimentary rocks. The VESPA lavas are part of a >3000 km long disrupted belt of Eocene to Miocene subduction-related volcanic rocks. The belt includes arc rocks in Northland New Zealand, Northland Plateau, Three Kings Ridge, and Loyalty Ridge and, speculatively, D’Entrecasteaux Ridge. This belt is the product of superimposed Eocene and Oligocene-Miocene remnant volcanic arcs that were stranded along and near the edge of Zealandia while still-active arc belts migrated east with the Pacific trench.
Plain word summary: Samples of lava from the seabed between New Zealand and New Caledonia have been dated using atomic clocks and fossils. Most lavas erupted in a big pulse of volcanic activity between 25 and 22 million years ago. They are part of a belt of now-extinct undersea volcanoes that stretches for more than 3000 km between New Zealand and the Solomon Islands. These volcanoes were formed by subduction of the Pacific Plate under the Australian Plate.
Simple
- Date (Publication)
- 2023-01-02
- Date (Revision)
- 2023-01-02
- Other citation details
- Gans Phil B, Mortimer Nick, Patriat Martin, Turnbull Rose E, Crundwell Martin, Agranier Arnaud, Calvert Andrew, Seward Gareth, Etienne Samuel, Durance Patricia Mj, Campbell Hugh J, Collot Julien (2023). Argon/Argon, micropaleontological and Uranium/Lead geochronological data for igneous and sedimentary rocks dredged during the VESPA scientific cruise. SEANOE. https://doi.org/10.17882/89740
- Theme
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- Southwest Pacific
- New Zealand
- New Caledonia
- Igneous rocks
- Sedimentary rocks
- Ar/Ar geochronology
- U/Pb geochronology
- Micropaleontology
- Geochemistry
- Volcanic arc
- Subduction
- Tectonics
- Cretaceous
- Eocene
- Oligocene
- Miocene
- Marine geology
- Use limitation
- CC-BY (Creative Commons - Attribution)
- Use constraints
- Other restrictions
- Date (Publication)
- 2023
- Unique resource identifier
- 10.1016/j.lithos.2022.106981
- Association Type
- Cross reference
- Initiative Type
- Study
- Date (Publication)
- 2023
- Unique resource identifier
- 10.1029/2022GC010670
- Association Type
- Cross reference
- Initiative Type
- Study
- Date (Publication)
- 2022
- Unique resource identifier
- 10.1029/2022GC010670
- Association Type
- Cross reference
- Initiative Type
- Study
- Unique resource identifier
- 10.17600/15001100
- Association Type
- Cross reference
- Initiative Type
- Platform
- Metadata language
- English
- Topic category
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- Oceans
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- OnLine resource
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Processed data
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VESPA Dating Study Supp File 2: Thin section images of Ar/Ar dated samples - 18 MB
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Processed data
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WWW:DOWNLOAD-1.0-link--download
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VESPA Dating Study Supp File 3: Electron Microprobe Work - 10 MB
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VESPA Dating Study Supp File 8: Biostratigraphy Crundwell et al. (2016) - 1 MB
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VESPA Dating Study Supp File 8: Biostratigraphy Crundwell et al. (2016) - 1 MB
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VESPA Dating Study Supp File 0: Supplemental files header and general information - 15 KB
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WWW:DOWNLOAD-1.0-link--download
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VESPA Dating Study Supp File 0: Supplemental files header and general information - 15 KB
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VESPA Dating Study Supp File 5: Petrography and Ar/Ar dating Summary - 89 KB
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VESPA Dating Study Supp File 5: Petrography and Ar/Ar dating Summary - 89 KB
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Raw data
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VESPA Dating Study Supp File 6: Ar-Ar raw data - 3 MB
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Quality controlled data
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VESPA Dating Study Supp File 4: Petrographic observations, photomicrographs, K and Ca element maps, mineral and K reservoir modes, argon spectra and interpretive comments for eight VESPA samples - 3 MB
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VESPA Dating Study Supp File 0: Supplemental files header and general information - 1 KB
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WWW:DOWNLOAD-1.0-link--download
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VESPA Dating Study Supp File 0: Supplemental files header and general information - 1 KB
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Processed data
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WWW:DOWNLOAD-1.0-link--download
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VESPA Dating Study Supp File 7: Zircon cathodoluminescence images and U-Pb data - 1000 KB
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VESPA Dating Study Supp File 1: Analytical Methods - 137 KB
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WWW:DOWNLOAD-1.0-link--download
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VESPA Dating Study Supp File 1: Analytical Methods - 137 KB
- OnLine resource
- DOI of the product ( DOI )
- OnLine resource
- Seanoe ( rel-canonical )
- Hierarchy level
- Dataset
- File identifier
- seanoe:89740 XML
- Metadata language
- English
- Character set
- UTF8
- Hierarchy level
- Dataset
- Date stamp
- 2023-01-02
- Metadata standard name
- ISO 19115:2003/19139
- Metadata standard version
- 1.0
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