scholarly journals The mantle source of basalts from Reunion Island is not more oxidized than the MORB source mantle

2021 ◽  
Vol 177 (1) ◽  
Author(s):  
Maryjo Brounce ◽  
Edward Stolper ◽  
John Eiler
Keyword(s):  
Indian Ocean ◽  
Canary Islands ◽  
Mantle Source ◽  
Reunion Island ◽  
Near Surface ◽  
Isotopic Compositions ◽  
Mantle Sources ◽  
Réunion Island ◽  
Mantle Component ◽  
The Indian Ocean

AbstractGlasses quenched from relatively undegassed ocean island magmas erupted from volcanoes at Iceland, Hawaii, the Canary Islands, and Erebus have elevated Fe3+/∑Fe ratios compared to glasses quenched from mid-ocean ridge basalts. This has been ascribed to elevated fO2 of their mantle sources, plausibly due to subducted, oxidized near-surface-derived components in their mantle sources. The basaltic magmas from Reunion Island in the Indian ocean have Sr–Nd-Hf-Pb-Os isotopic compositions suggesting that their mantle sources contain little or no subducted near-surface materials and contain the C/FOZO/PREMA mantle component. To constrain the fO2 of the C/FOZO/PREMA mantle component and test the link between oxidized OIB and recycled surface-derived materials in their sources, we measured major and volatile element abundances and Fe3+/∑Fe ratios of naturally glassy, olivine-hosted melt inclusions from Piton de La Fournaise volcano, La Reunion. We conclude that the fO2 of the mantle source of these Reunion lavas is lower than of the mantle sources of primitive, undegassed magmas from Hawaii, Iceland, the Canary Islands, and Mt. Erebus, and indistinguishable from that of the Indian-ocean upper mantle. This finding is consistent with previous suggestions that the source of Reunion lavas (and the C/FOZO/PREMA mantle component) contains little or no recycled materials and with the suggestion that recycled oxidized materials contribute to the high fO2 of some other OIBs, especially those from incompatible-element-enriched mantle sources. Simple mixing models between oxidized melts of EM1 and HIMU components and relatively reduced melts of DMM can explain the isotopic compositions and Fe3+/∑Fe ratios of lavas from Hawaii, Iceland, the Canary Islands, and Mount Erebus; this model can be tested by study of additional OIB magmas, including those rich in the EM2 component.

Estimated risk of Chikungunya viremic blood donation during an epidemic on Reunion Island in the Indian Ocean, 2005 to 2007

Transfusion ◽  
2008 ◽  
Vol 48 (7) ◽  
pp. 1333-1341 ◽  
Author(s):  
Ccile Brouard ◽  
Pascale Bernillon ◽  
Isabelle Quatresous ◽  
Josiane Pillonel ◽  
Azzedine Assal ◽  
...  
Keyword(s):  
Indian Ocean ◽  
Blood Donation ◽  
Reunion Island ◽  
Réunion Island ◽  
Estimated Risk ◽  
The Indian Ocean

scholarly journals Atmospheric CO and CH<sub>4</sub> time series and seasonal variations on Reunion Island from ground-based in situ and FTIR (NDACC and TCCON) measurements

2018 ◽  
Vol 18 (19) ◽  
pp. 13881-13901 ◽  
Author(s):  
Minqiang Zhou ◽  
Bavo Langerock ◽  
Corinne Vigouroux ◽  
Mahesh Kumar Sha ◽  
Michel Ramonet ◽  
...  
Keyword(s):  
Time Series ◽  
Indian Ocean ◽  
Mole Fraction ◽  
Seasonal Cycles ◽  
Reunion Island ◽  
Time Period ◽  
Réunion Island ◽  
The Indian Ocean ◽  
Good Agreement

Abstract. Atmospheric carbon monoxide (CO) and methane (CH4) mole fractions are measured by ground-based in situ cavity ring-down spectroscopy (CRDS) analyzers and Fourier transform infrared (FTIR) spectrometers at two sites (St Denis and Maïdo) on Reunion Island (21∘ S, 55∘ E) in the Indian Ocean. Currently, the FTIR Bruker IFS 125HR at St Denis records the direct solar spectra in the near-infrared range, contributing to the Total Carbon Column Observing Network (TCCON). The FTIR Bruker IFS 125HR at Maïdo records the direct solar spectra in the mid-infrared (MIR) range, contributing to the Network for the Detection of Atmospheric Composition Change (NDACC). In order to understand the atmospheric CO and CH4 variability on Reunion Island, the time series and seasonal cycles of CO and CH4 from in situ and FTIR (NDACC and TCCON) measurements are analyzed. Meanwhile, the difference between the in situ and FTIR measurements are discussed. The CO seasonal cycles observed from the in situ measurements at Maïdo and FTIR retrievals at both St Denis and Maïdo are in good agreement with a peak in September–November, primarily driven by the emissions from biomass burning in Africa and South America. The dry-air column averaged mole fraction of CO (XCO) derived from the FTIR MIR spectra (NDACC) is about 15.7 ppb larger than the CO mole fraction near the surface at Maïdo, because the air in the lower troposphere mainly comes from the Indian Ocean while the air in the middle and upper troposphere mainly comes from Africa and South America. The trend for CO on Reunion Island is unclear during the 2011–2017 period, and more data need to be collected to get a robust result. A very good agreement is observed in the tropospheric and stratospheric CH4 seasonal cycles between FTIR (NDACC and TCCON) measurements, and in situ and the Michelson Interferometer for Passive Atmospheric Sounding (MIPAS) satellite measurements, respectively. In the troposphere, the CH4 mole fraction is high in August–September and low in December–January, which is due to the OH seasonal variation. In the stratosphere, the CH4 mole fraction has its maximum in March–April and its minimum in August–October, which is dominated by vertical transport. In addition, the different CH4 mole fractions between the in situ, NDACC and TCCON CH4 measurements in the troposphere are discussed, and all measurements are in good agreement with the GEOS-Chem model simulation. The trend of XCH4 is 7.6±0.4 ppb yr−1 from the TCCON measurements over the 2011 to 2017 time period, which is consistent with the CH4 trend of 7.4±0.5 ppb yr−1 from the in situ measurements for the same time period at St Denis.

scholarly journals Visualizing Roots and Itineraries of Indian Ocean Creolizations: Project for a Museum of the Present

2008 ◽  
Vol 3 (2) ◽  
Author(s):  
Françoise Vergès
Keyword(s):  
Indian Ocean ◽  
Reunion Island ◽  
Visual Elements ◽  
Réunion Island ◽  
The Indian Ocean ◽  
Methodological Problems ◽  
The Creation ◽  
Indian Ocean World

In this paper, I will discuss the methodological problems raised by the museography of a forthcoming museum on Reunion Island, the Maison des civilisations et de l'unité réunionnaise. One of the museum's goals is to retrace visually the itineraries of the processes of creolisation in the Indian Ocean that led to the creation of a singular culture, the Creole indiaoceanic culture. How to visualise the multiple layers of signification at work, the traces and fragments of languages, imaginaries, rituals, practices travelling throughout the ocean, the dynamic of loss, transformation, translation and recreation of forms, rituals, practices in the itineraries of people? I will first present the museum, its context and goals, then suggests ways of “making visual” elements of the Indian Ocean’s long history, and finally, discuss the challenges of imagining a museum of the present in the Indian Ocean world.

Elver Invasion, Population Structure and Growth of Marbled eels Anguilla marmorata in a Tropical River on Réunion Island in the Indian Ocean

2003 ◽  
Vol 68 (4) ◽  
pp. 339-348 ◽  
Author(s):  
Tony Robinet ◽  
Sylvie Guyet ◽  
Gérard Marquet ◽  
Béatrice Mounaix ◽  
Jean-Michel Olivier ◽  
...  
Keyword(s):  
Population Structure ◽  
Indian Ocean ◽  
Reunion Island ◽  
Tropical River ◽  
Anguilla Marmorata ◽  
Réunion Island ◽  
The Indian Ocean

scholarly journals Leptodontium stellatifolium (Pottiaceae, Bryophyta) in la Réunion Island, a major range disjunction.

2017 ◽  
Vol 52 (2) ◽  
pp. 393-398
Author(s):  
Richard H. Zander ◽  
Terry A. Hedderson
Keyword(s):  
Latin America ◽  
Indian Ocean ◽  
Geographic Range ◽  
Reunion Island ◽  
La Réunion ◽  
Spore Dispersal ◽  
Mountainous Regions ◽  
Réunion Island ◽  
The Indian Ocean ◽  
La Réunion Island

A species of mountainous regions of Latin America, Leptodontium stellatifolium, is reported from La Réunion Island in the Indian Ocean. This is a major geographic range disjunction. The species is illustrated and described from La Réunion material, and its considerable variation across its range and within La Réunion is discussed. Explanations of its distribution are suggested in terms of both ancient sky and ocean island spore dispersal, and recent, human-mediated introduction. We provide a key for species of Leptodontium occurring on La Réunion.

scholarly journals Rescue of the Mascarene Petrel, a Critically Endangered Seabird of Réunion Island, Indian Ocean

The Condor ◽  
2003 ◽  
Vol 105 (2) ◽  
pp. 387-391 ◽  
Author(s):  
Matthieu Le Corre ◽  
Thomas Ghestemme ◽  
Marc Salamolard ◽  
François-Xavier Couzi
Keyword(s):  
Indian Ocean ◽  
Austral Summer ◽  
Small Population ◽  
Reunion Island ◽  
The Public ◽  
The World ◽  
Réunion Island ◽  
Conservation Plan ◽  
The Indian Ocean ◽  
First Time

Abstract The Mascarene Petrel (Pseudobulweria aterrima), an endemic seabird of Réunion Island, is one of the rarest and least known birds in the world. In this note we report on light-induced mortality in this species at Réunion Island, in the Indian Ocean. Throughout most of the twentieth century, when Réunion Island's population was relatively small, only three birds were found dead or dying. After instituting in 1996 a program encouraging the public to rescue downed seabirds, we received eight Mascarene Petrels, among which seven were banded and released. Four birds were fledglings attracted by lights while on their first flight to sea. These findings show for the first time since the end of the nineteenth century that Mascarene Petrels still breed at Réunion. All fledglings were found in March (late austral summer), suggesting a synchronous summer breeding season. We discuss past and present effects of urban lights on this small population and propose a conservation plan. Rescate de Pseudobulweria aterrima, un Ave Marina Críticamente Amenazada de la Isla Reunión, Océano Indico Resumen. Pseudobulweria aterrima, un ave marina endémica de la isla Réunion, es una de las aves más raras y menos conocidas del mundo. En esta nota exponemos los resultados de un estudio sobre mortalidad en esta especie provocada por la iluminación artificial en la isla Reunión. A través de la mayor parte del siglo veinte, cuando la población en la isla era relativamente pequeña, sólo tres aves fueron encontradas muertas o muriendo. Luego de instituir en 1996 un programa que incentivó al público a rescatar aves abatidas, recibimos ocho aves de las cuales siete fueron anilladas y liberadas. Cuatro de las aves eran volantones jóvenes que fueron atraídos por las luces durante su primer vuelo hacia el mar. Estos resultados muestran por primera vez desde fines del siglo diecinueve que P. aterrima se sigue reproduciendo con éxito en esta isla. Los cuatro volantones fueron encontrados en el mes de marzo, lo que nos hace suponer que la reproducción se realiza sincrónicamente durante el verano austral. Discutimos las consecuencias pasadas y actuales de las luces artificiales sobre esta pequeña población y proponemos un plan de acción para su conservación.

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