Sulfide mantle source heterogeneity recorded in basaltic lavas from the Azores

Waters C. L., Day J. M. D., Watanabe S., Sayit K., Zanon V., Olson K. M., ...Daha Fazla

GEOCHIMICA ET COSMOCHIMICA ACTA, cilt.268, ss.422-445, 2020 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 268
  • Basım Tarihi: 2020
  • Doi Numarası: 10.1016/j.gca.2019.10.012
  • Dergi Adı: GEOCHIMICA ET COSMOCHIMICA ACTA
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Aerospace Database, Aquatic Science & Fisheries Abstracts (ASFA), Artic & Antarctic Regions, CAB Abstracts, Communication Abstracts, Environment Index, Geobase, INSPEC, Metadex, Pollution Abstracts, Veterinary Science Database, Civil Engineering Abstracts
  • Sayfa Sayıları: ss.422-445
  • Anahtar Kelimeler: Osmium isotopes, Highly siderophile elements, Ocean island basalts, Sulfides, Mantle heterogeneity, Azores, OS ISOTOPE SYSTEMATICS, HIGHLY SIDEROPHILE ELEMENTS, PLATINUM-GROUP ELEMENTS, RECYCLED OCEANIC LITHOSPHERE, SAO-MIGUEL, ISLAND BASALTS, SILICATE MELT, PB ISOTOPE, U-235-PA-231 DISEQUILIBRIA, ABYSSAL PERIDOTITES
  • Orta Doğu Teknik Üniversitesi Adresli: Evet

Özet

New highly siderophile element (HSE: Os, Ir, Ru, Pt, Pd, Re) abundance and Os isotopic compositions, along with major- and trace-element abundance and Sr-Nd-Hf-Pb isotope data are reported for high-MgO (>8-17 wt.%) lavas from the islands of Sao Miguel, Terceira, Pico and Faial in the Azores archipelago. The lavas span the range of Sr-Nd-Hf-Pb isotope and trace-element abundance variability reported previously for the islands. Pico and Faial lavas preserve distinct absolute and relative HSE abundances and Os-187/Os-188 (Sigma(HSE) = 2 +/- 2 ng g(-1); 2SD; Os-187/Os-188 in lavas with > 50 pg g(-1) Os = 0.1255 +/- 31; 2SD) compared with Sao Miguel and Terceira lavas (Sigma(HSE) = 5 +/- 3 ng g(-1) ; Os-187/Os-188(50pg) = 0.1284 +/- 48). Although HSE abundance variations in volcanic rocks from individual Azorean islands can be explained by sulfide crystallization, those between Pico and Faial and Sao Miguel and Terceira can only reasonably be attributed to partial melting of distinct mantle sources.