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Details

Autor(en) / Beteiligte
Titel
Basalt derived from highly refractory mantle sources during early Izu-Bonin-Mariana arc development
Ist Teil von
  • Nature communications, 2021-03, Vol.12 (1), p.1723-1723, Article 1723
Ort / Verlag
England: Nature Publishing Group
Erscheinungsjahr
2021
Link zum Volltext
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
  • The magmatic character of early subduction zone and arc development is unlike mature systems. Low-Ti-K tholeiitic basalts and boninites dominate the early Izu-Bonin-Mariana (IBM) system. Basalts recovered from the Amami Sankaku Basin (ASB), underlying and located west of the IBM's oldest remnant arc, erupted at ~49 Ma. This was 3 million years after subduction inception (51-52 Ma) represented by forearc basalt (FAB), at the tipping point between FAB-boninite and typical arc magmatism. We show ASB basalts are low-Ti-K, aluminous spinel-bearing tholeiites, distinct compared to mid-ocean ridge (MOR), backarc basin, island arc or ocean island basalts. Their upper mantle source was hot, reduced, refractory peridotite, indicating prior melt extraction. ASB basalts transferred rapidly from pressures (~0.7-2 GPa) at the plagioclase-spinel peridotite facies boundary to the surface. Vestiges of a polybaric-polythermal mineralogy are preserved in this basalt, and were not obliterated during persistent recharge-mix-tap-fractionate regimes typical of MOR or mature arcs.
Sprache
Englisch
Identifikatoren
ISSN: 2041-1723
eISSN: 2041-1723
DOI: 10.1038/s41467-021-21980-0
Titel-ID: cdi_doaj_primary_oai_doaj_org_article_250352f660fc422d84c6914a027f6364

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