Abstract Details
(2020) High Nb Basalt Like Signatures from SW Japan Volcanics
Dey B, Shibata T & Yoshikawa M
https://doi.org/10.46427/gold2020.566
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03a: Room 1, Wednesday 24th June 00:54 - 00:57
Bidisha Dey
Tomoyuki Shibata View all 3 abstracts at Goldschmidt2020 View abstracts at 12 conferences in series
Masako Yoshikawa View all 3 abstracts at Goldschmidt2020 View abstracts at 11 conferences in series
Tomoyuki Shibata View all 3 abstracts at Goldschmidt2020 View abstracts at 12 conferences in series
Masako Yoshikawa View all 3 abstracts at Goldschmidt2020 View abstracts at 11 conferences in series
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Submitted by Michael Rowe on Tuesday 23rd June 04:02
Thanks for the presentation, you presented a lot of chemical data for your basalts, but can you please speculate how your data/interpretations tie to the proposed origin models you presented at the start?
Thank you for your question. The isotopic data shows that OIB reservoir type signature from lower mantle (EM1, EM2, HIMU) are not seen. This suggests that major input from the mantle is unlikely. Hence, the high HFSE signature is most likely from subducted oceanic crust and/or sediments as suggested by Kepezhinskas et al (1995, 1996); Defant et al (1992); Hastie et al (2011) and others.
Thanks for the presentation, you presented a lot of chemical data for your basalts, but can you please speculate how your data/interpretations tie to the proposed origin models you presented at the start?
Thank you for your question. The isotopic data shows that OIB reservoir type signature from lower mantle (EM1, EM2, HIMU) are not seen. This suggests that major input from the mantle is unlikely. Hence, the high HFSE signature is most likely from subducted oceanic crust and/or sediments as suggested by Kepezhinskas et al (1995, 1996); Defant et al (1992); Hastie et al (2011) and others.
Submitted by Jeffrey Ryan on Wednesday 24th June 17:18
The specifics of the slab component here are rather different from those proposed by Kepezhinskas and Defant and coworkers in that there is a substantive sediment component in it. Would another potential model be the melting of slab-derived diapirs of low density sediment/serpentine/altered mafic crustal materials that may be seeding this region?
Yes that is a very good point. It is likely that the High Nb character is generated this way, but the exact mixing calculations needs to be done.
The specifics of the slab component here are rather different from those proposed by Kepezhinskas and Defant and coworkers in that there is a substantive sediment component in it. Would another potential model be the melting of slab-derived diapirs of low density sediment/serpentine/altered mafic crustal materials that may be seeding this region?
Yes that is a very good point. It is likely that the High Nb character is generated this way, but the exact mixing calculations needs to be done.
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