Petrogenesis of Lava from Christmas Island, Northeast Indian Ocean: Implications for the Nature of Recycled Components in Non-Plume Intraplate Settings
Lava samples from the Christmas Island Seamount Province (CHRISP) record an extreme range in enriched mantle (EM) type Sr-Nd-Pb-Hf isotope signatures. Here we report osmium isotope data obtained on four samples from the youngest, Pliocene petit-spot phase (Upper Volcanic Series, UVS; ~4.4 Ma), and f...
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MDPI AG
2022-03-01
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| Series: | Geosciences |
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| Online Access: | https://www.mdpi.com/2076-3263/12/3/118 |
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| author | Trevor J. Falloon Kaj Hoernle Bruce F. Schaefer Ilya N. Bindeman Stanley R. Hart Dieter Garbe-Schonberg Robert A. Duncan |
| author_facet | Trevor J. Falloon Kaj Hoernle Bruce F. Schaefer Ilya N. Bindeman Stanley R. Hart Dieter Garbe-Schonberg Robert A. Duncan |
| author_sort | Trevor J. Falloon |
| collection | DOAJ |
| description | Lava samples from the Christmas Island Seamount Province (CHRISP) record an extreme range in enriched mantle (EM) type Sr-Nd-Pb-Hf isotope signatures. Here we report osmium isotope data obtained on four samples from the youngest, Pliocene petit-spot phase (Upper Volcanic Series, UVS; ~4.4 Ma), and four samples from the earlier, Eocene (Lower Volcanic Series, LVS; ~40 Ma) shield building phase of Christmas Island. Osmium concentrations are low (5–82 ppt) with initial Os isotopic values (<sup>187</sup>Os/<sup>188</sup>Os<sub>i</sub>) ranging from (0.1230–0.1679). Along with additional new geochemical data (major and trace elements, Sr-Nd-Pb isotopes, olivine δ<sup>18</sup>O values), we demonstrate the following: (1) The UVS is consistent with melting of shallow Indian mid-ocean ridge basalt (MORB) mantle enriched with both lower continental crust (LCC) and subcontinental lithospheric mantle (SCLM) components; and (2) The LVS is consistent with recycling of SCLM components related to Gondwana break-up. The SCLM component has FOZO or HIMU like characteristics. One of the LVS samples has less radiogenic Os (γOs –3.4) and provides evidence for the presence of ancient SCLM in the source. The geochemistry of the Christmas Island lava series supports the idea that continental breakup causes shallow recycling of lithospheric and lower crustal components into the ambient MORB mantle. |
| first_indexed | 2024-03-09T19:47:47Z |
| format | Article |
| id | doaj.art-e8667664e6dd4e568c61b7ff51abc775 |
| institution | Directory Open Access Journal |
| issn | 2076-3263 |
| language | English |
| last_indexed | 2024-03-09T19:47:47Z |
| publishDate | 2022-03-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Geosciences |
| spelling | doaj.art-e8667664e6dd4e568c61b7ff51abc7752023-11-24T01:20:31ZengMDPI AGGeosciences2076-32632022-03-0112311810.3390/geosciences12030118Petrogenesis of Lava from Christmas Island, Northeast Indian Ocean: Implications for the Nature of Recycled Components in Non-Plume Intraplate SettingsTrevor J. Falloon0Kaj Hoernle1Bruce F. Schaefer2Ilya N. Bindeman3Stanley R. Hart4Dieter Garbe-Schonberg5Robert A. Duncan6School of Natural Sciences, College of Sciences and Engineering, University of Tasmania, Hobart, TAS 7001, AustraliaGEOMAR Helmholtz Centre for Ocean Research Kiel, Wischhofstrasse 1–3, 24148 Kiel, GermanyDepartment of Earth and Planetary Sciences, Macquarie University, Sydney, NSW 2109, AustraliaDepartment of Earth Sciences, 1272 University of Oregon, Eugene, OR 97403, USADepartment of Geology and Geophysics, Woods Hole Oceanographic Institution, Woods Hole, Falmouth, MA 02543, USAInstitute for Geosciences, Kiel University, Ludewig-Meyn-Str. 10, 24118 Kiel, GermanyCollege of Earth, Ocean, and Atmospheric Sciences, Oregon State University, Corvallis, OR 97333, USALava samples from the Christmas Island Seamount Province (CHRISP) record an extreme range in enriched mantle (EM) type Sr-Nd-Pb-Hf isotope signatures. Here we report osmium isotope data obtained on four samples from the youngest, Pliocene petit-spot phase (Upper Volcanic Series, UVS; ~4.4 Ma), and four samples from the earlier, Eocene (Lower Volcanic Series, LVS; ~40 Ma) shield building phase of Christmas Island. Osmium concentrations are low (5–82 ppt) with initial Os isotopic values (<sup>187</sup>Os/<sup>188</sup>Os<sub>i</sub>) ranging from (0.1230–0.1679). Along with additional new geochemical data (major and trace elements, Sr-Nd-Pb isotopes, olivine δ<sup>18</sup>O values), we demonstrate the following: (1) The UVS is consistent with melting of shallow Indian mid-ocean ridge basalt (MORB) mantle enriched with both lower continental crust (LCC) and subcontinental lithospheric mantle (SCLM) components; and (2) The LVS is consistent with recycling of SCLM components related to Gondwana break-up. The SCLM component has FOZO or HIMU like characteristics. One of the LVS samples has less radiogenic Os (γOs –3.4) and provides evidence for the presence of ancient SCLM in the source. The geochemistry of the Christmas Island lava series supports the idea that continental breakup causes shallow recycling of lithospheric and lower crustal components into the ambient MORB mantle.https://www.mdpi.com/2076-3263/12/3/118osmium isotopespetit-spot volcanismolivine oxygen isotopesintraplate volcanismChristmas IslandIndian Ocean |
| spellingShingle | Trevor J. Falloon Kaj Hoernle Bruce F. Schaefer Ilya N. Bindeman Stanley R. Hart Dieter Garbe-Schonberg Robert A. Duncan Petrogenesis of Lava from Christmas Island, Northeast Indian Ocean: Implications for the Nature of Recycled Components in Non-Plume Intraplate Settings Geosciences osmium isotopes petit-spot volcanism olivine oxygen isotopes intraplate volcanism Christmas Island Indian Ocean |
| title | Petrogenesis of Lava from Christmas Island, Northeast Indian Ocean: Implications for the Nature of Recycled Components in Non-Plume Intraplate Settings |
| title_full | Petrogenesis of Lava from Christmas Island, Northeast Indian Ocean: Implications for the Nature of Recycled Components in Non-Plume Intraplate Settings |
| title_fullStr | Petrogenesis of Lava from Christmas Island, Northeast Indian Ocean: Implications for the Nature of Recycled Components in Non-Plume Intraplate Settings |
| title_full_unstemmed | Petrogenesis of Lava from Christmas Island, Northeast Indian Ocean: Implications for the Nature of Recycled Components in Non-Plume Intraplate Settings |
| title_short | Petrogenesis of Lava from Christmas Island, Northeast Indian Ocean: Implications for the Nature of Recycled Components in Non-Plume Intraplate Settings |
| title_sort | petrogenesis of lava from christmas island northeast indian ocean implications for the nature of recycled components in non plume intraplate settings |
| topic | osmium isotopes petit-spot volcanism olivine oxygen isotopes intraplate volcanism Christmas Island Indian Ocean |
| url | https://www.mdpi.com/2076-3263/12/3/118 |
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