FN Archimer Export Format
PT J
TI Fani Maoré, a new “young HIMU” volcano with extreme geochemistry
BT 
AF Chauvel, Catherine
   Inglis, Edward C.
   Gutierrez, Pamela
   Luu, Tu-Han
   Burckel, Pierre
   Besson, Pascale
AS 1:1;2:1;3:1;4:1;5:1;6:1;
FF 1:;2:;3:;4:;5:;6:;
C1 Université Paris Cité, Institut de Physique du Globe de Paris, CNRS, UMR 7154, F-75005 Paris, France
C2 UNIV PARIS CITE, FRANCE
IF 5.3
TC 0
UR https://archimer.ifremer.fr/doc/00872/98422/107853.pdf
   https://archimer.ifremer.fr/doc/00872/98422/107854.pdf
   https://archimer.ifremer.fr/doc/00872/98422/107855.xlsx
LA English
DT Article
CR MAYOBS
   MAYOBS1
   MAYOBS2
   MAYOBS4
   MD 228 / MAYOBS15
BO Marion Dufresne
DE ;Trace elements;Radiogenic isotopes;OIB;Comoros;Mantle plumes
AB Intraplate volcanism provides remarkable insight into diverse sources in the mantle because its source can be quite shallow, or as deep as the core-mantle boundary, and its origin can be as diverse as recycled crustal material or undifferentiated mantle. While geophysical approaches can in some cases locate the source of magmas, a geochemical approach is necessary to characterize both the nature of the source and the way it melts to produce the erupted lavas. Here we present geochemical and isotopic data obtained on a new submarine volcano (Fani Maoré) that was discovered in 2019 next to Mayotte Island in the Comoros. The radiogenic isotope data are remarkably uniform at subdued values intermediate between HIMU and EM1 compositions but trace element contents are unusual with a marked enrichment in Ba (Ba/Th ≈ 370 compared with the ocean island basalt (OIB) average of 100) and depletion in Pb (Ce/Pb ≈ 70 versus 25 for average OIB). This unique data set suggests that the basanites formed by melting of a carbonated mantle source that was highly enriched in Ba and volatiles. A similar source is also present under the East African Rift where contemporaneous basanite and carbonatite eruptions are known. This establishes a possible link between the volcanic activity of the Comoros and the East African Rift zone. More generally, it demonstrates that carbonated sources are more common in the mantle than previously thought and can be traced using trace element geochemistry. Other volcanoes in the world carry similar characteristics and we suggest that carbonated mantle sources explain the geochemical peculiarities of not only Fani Maoré in the Comoros but also those of Cape Verde volcanics and more generally those of many HIMU-like OIBs, in particular the so-called ‘young HIMU’ OIBs.   
PY 2024
PD JAN
SO Earth And Planetary Science Letters
SN 0012-821X
PU Elsevier BV
VL 626
UT 001138088800001
DI 10.1016/j.epsl.2023.118529
ID 98422
ER

EF