The Geochemical Regimes of Piton de la Fournaise Volcano (Reunion) During the Last 530 000 Years

Albarède, Frnacis

doi:10.1093/petrology/38.2.171

Cited by 57 publications

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“… 87 Sr/ 86 Sr, ɛ Nd , and ɛ Hf in Mauritius lavas. Shown for comparison are fields for Réunion [ Fisk et al , 1988; Albarède et al , 1997; Bosch et al , 1999; Luais , 2004; J. Blichert ‐ Toft, unpublished data] and CIR MORB [ Ito et al , 1987; Mahoney et al , 1989; Chauvel and Blichert‐Toft , 2001; Escrig et al , 2004]. Open symbols are previously reported data on Mauritius lavas [ Mahoney et al , 1989; Peng and Mahoney , 1995; Sheth et al , 2003; Nohda et al , 2005].…”

Section: Resultsmentioning

confidence: 99%

“…The Ambenali Formation is thought to represent the least crustally contaminated of the Deccan Flood Basalts. Data are from this study, Baxter et al [1985], Fisk et al [1988], White et al [1990], Albarède et al [1997], Mahoney et al [1982], and Lightfoot and Hawkesworth [1988].…”

Section: Discussionmentioning

confidence: 99%

“…Réunion has been the subject of numerous geochemical studies [e.g., Upton and Wadsworth , 1966; McDougall , 1971; Oversby , 1972; Fisk et al , 1988; Albarède et al , 1997; Luais , 2004] while geochemical data on Mauritian basalts are unfortunately scarcer [ Norry , 1977; Mahoney et al , 1989; Sheth et al , 2003; Nohda et al , 2005]. We report concentrations for 36 trace elements and Sr, Nd, Pb, and Hf isotopic ratios of 30 basalt samples covering the three different volcanic series of Mauritius.…”

Section: Introductionmentioning

confidence: 97%

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Geochemistry of Mauritius and the origin of rejuvenescent volcanism on oceanic island volcanoes

Paul

White

Blichert‐Toft

2005

Geochem Geophys Geosyst

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[1] We report new trace element concentrations and Sr, Nd, Hf, and Pb isotopic ratios for basalts from the three lava series of Mauritius. Older Series lavas, which represent the shield-building phase of Mauritius, are isotopically similar to other lavas produced by the Réunion mantle plume. The Intermediate and Younger Series lavas, erupted after a hiatus of millions of years, have more depleted isotopic signatures than the Older Series. Incompatible element abundances and major element compositions suggest that the extent of melting was greatest for the Older Series, smallest for the Intermediate Series, and intermediate for the Younger Series. Volcanic evolution on Mauritius is thus broadly similar to the Hawaiian pattern, with lavas of the rejuvenescent phase being produced by small degrees of melting of a more depleted source than the shield phase. We propose that both shield and rejuvenescent phase magmas are derived from a lithologically heterogeneous or ''plum pudding'' mantle plume that consists of pods or veins of low-solidus-temperature material such as eclogite or pyroxenite embedded in peridotite matrix. The plums have a less depleted isotopic signature than the matrix. In the vertical stem of the plume, melting is zoned: at greatest depth, only the plums melt; at intermediate depth, both plums and matrix melt, and at shallowest depth, only the matrix melts. Shield stage magmas are hybrids of melts produced in all three zones. As the plume flattens out against the lithosphere and is dragged downstream of the stem, some melting continues due to buoyant lateral spreading of the plume. In this region, although both plums and matrix are melting, melts produced carry the isotopic signature of the matrix because incompatible elements in the plums were previously stripped during melting in the vertical stem of the plume. The relatively small degree melts produced in the melting tail, which give rise to rejuvenescent stage volcanism, thus carry the isotopic signature of the matrix. From a consideration of thermal and isotopic equilibrium, we judge the scale of heterogeneity to be about 10 2 m.

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Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

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Geochemistry of Mauritius and the origin of rejuvenescent volcanism on oceanic island volcanoes

Paul

White

Blichert‐Toft

2005

Geochem Geophys Geosyst

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“…Notably, the basaltic glass sample with the highest 3 He/ 4 He value (12.2 R A ; DR08–1) showed the highest 87 Sr/ 86 Sr (0.7040) and one of the lowest 143 Nd/ 144 Nd ratios (0.5129) in the study of Nauret et al [2006], i.e., a radiogenic isotope signature that is similar to the Réunion hot spot source [e.g., Luais , 2004; Bosch et al , 2008; Pietruszka et al , 2009]. In contrast, the same sample records the lowest Ba/La (1.1) and highest Zr/Nb (113.3) ratios, as well as a low (La/Sm) N value of 0.45 (Table 2 and Figures 3 and 6c); these trace element characteristics are typically attributed to melting of normal MORB mantle [e.g., Sun and McDonough , 1989; Albarède et al , 1997; Le Roux et al , 2002]. We propose that the isotope enrichment (i.e., high 3 He/ 4 He and 87 Sr/ 86 Sr together with low 143 Nd/ 144 Nd ratios) and concomitant trace element depletion observed at the Gasitao Ridge results from partial melting of a mantle source that has been contaminated by Réunion hot spot mantle; in this case, the hot spot component is characterized by significantly lower (La/Sm) N and Ba/La ratios, as well as a higher Zr/Nb value, than generally observed for “enriched” hot spot mantle as a result of previous extraction of incompatible trace elements by melting (Figure 6).…”

Section: Discussionmentioning

confidence: 99%

Helium isotope variations between Réunion Island and the Central Indian Ridge (17°–21°S): New evidence for ridge–hot spot interaction

et al. 2011

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[1] We report new helium abundance and isotope results for submarine basaltic glasses from the Central Indian Ridge (CIR) between the Marie Celeste (16.7°S) and Egeria fracture zones (FZ) (20.6°S); the adjacent Gasitao, Three Magi, and Rodrigues ridges; and for olivine separates from lavas and cumulate xenoliths from the Mascarene Islands (Réunion, Mauritius, and Rodrigues). Helium isotope ratios in basaltic glasses range from 7.1 to 12.2 R A (where R A = air 3 He/ 4 He) and lie between values of Mid-Ocean Ridge Basalt (MORB) (8 ± 1 R A ) and samples from Réunion Island (11.5 to 14.1 R A ). The highest 3 He/ 4 He values (up to 12.2 R A ) are found in glasses recovered off axis from the Three Magi and Gasitao ridges. Along the CIR axis, MORB-like 3 He/ 4 He ratios are found near the Egeria FZ, and there is a marked increase to values of ∼11 R A between ∼19°and 20°S. The lowest 3 He/ 4 He values (<8 R A ) are found immediately south of the Marie Celeste FZ, where incompatible trace element ratios (e.g., La/Sm) are highest. These low 3 He/ 4 He ratios can be explained by closed system radiogenic 4 He ingrowth in either (1) a "fossil" Réunion hot spot mantle component, embedded into the subridge mantle when the CIR migrated over the hot spot at ∼34 Ma or (2) trace element enriched MORB mantle. In contrast, the high 3 He/ 4 He ratios observed on the CIR axis adjacent to the Gasitao Ridge, and along the off-axis volcanic ridges, are consistent with flow of hot spot mantle material from Réunion (∼1100 km to the west) toward the CIR.

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“…A sample collected near the Marie Celeste fracture zone (~18°S) in the CIR had very low ε Nd and high 87 Sr/ 86 Sr with an indication of the ridge being affected by the reunion hot spot (Mahoney et al, 1989;Murton et al, 2005). Studies based on incompatible trace element ratios indicate that sediments from the CIR often exhibited nearly binary mixing trends, in which the southern CIR is characterized by MORB-like composition, while the other parts of CIR showed a basaltic composition from La Reunion island and its flanks (de Albare et al, 1997;Fisk et al, 1988;Fretzdorff & Haase, 2002;Ludden, 1978;Upton & Wadsworth, 1972). In the present study, the CIR REEs data (Figure 2c) show relatively high Sr and Eu concentrations compared to that of the SWCI and ANT sediments and to some extent with that of the SWIR sediments indicating hydrothermal and MORB-type sources.…”

Section: Cirmentioning

confidence: 99%

Trace Elements and Sr, Nd Isotope Compositions of Surface Sediments in the Indian Ocean: An Evaluation of Sources and Processes for Sediment Transport and Dispersal

Anand

Rahaman

Lathika

et al. 2019

Geochem Geophys Geosyst

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To decipher sediment provenance, understand dispersal pattern and its controlling factors in the Indian Ocean, we have studied major and trace element abundances and isotope compositions of Sr (87Sr/86Sr) and Nd (εNd) in silicate fractions of 38 surface sediment samples collected at ~1.5° interval from India (~10°N) to Antarctica (~70°S). The 87Sr/86Sr ratio and εNd vary from 0.70527 and 0.1 near Crozet Island to 0.77854 and −34.8 near Antarctica, respectively. Higher 87Sr/86Sr ratio and lower εNd near Antarctica indicate source of old granitic rocks, and the opposite is observed in sediments from the Central and the Southwest Indian Ridges indicating source of seafloor spreading and mid‐ocean ridge hydrothermal activity. Chondrite normalized Rare Earth Elements (REEs) pattern reveals positive Europium anomaly for Central and Southwest Indian Ridge sediments, while positive Gadolinium anomaly is observed in Indian and Antarctic coastal sediments. Sediments in the Indian sector of Southern Ocean and coastal Antarctica are highly dispersed through deep, bottom, and Antarctic circumpolar currents. The εNd spatial map generated for the entire Indian Ocean based on compilation of present study and results from literature shows dominance of terrigenous inputs from continental erosion with minor contribution from the ridges in the Indian Ocean. The εNd map together with trace elements can be employed for reconnaissance for mineral exploration associated with hydrothermal deposits. Further, comparison of detrital εNd with its counter phases, that is, authigenic fractions and modern seawater at the sampling sites, would enhance our knowledge of benthic exchange processes, with an implication in using Nd isotopes as a water mass circulation proxy.

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The Geochemical Regimes of Piton de la Fournaise Volcano (Reunion) During the Last 530 000 Years

Cited by 57 publications

References 0 publications

Geochemistry of Mauritius and the origin of rejuvenescent volcanism on oceanic island volcanoes

Geochemistry of Mauritius and the origin of rejuvenescent volcanism on oceanic island volcanoes

Helium isotope variations between Réunion Island and the Central Indian Ridge (17°–21°S): New evidence for ridge–hot spot interaction

Trace Elements and Sr, Nd Isotope Compositions of Surface Sediments in the Indian Ocean: An Evaluation of Sources and Processes for Sediment Transport and Dispersal

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