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Updated: Jul 26, 2026

Separation of Uranium and Thorium for 230Th-U Dating of Submarine Hydrothermal Sulfides
Published on: May 20, 2019
Hf isotope evidence for pelagic sediments in the source of hawaiian basalts
Blichert-Toft1, Frey, Albarede
1Ecole Normale Superieure de Lyon, 69364 Lyon Cedex 7, France. Massachusetts Institute of Technology, Cambridge, MA 02139, USA.
Abstract:
Lead, oxygen, and osmium isotopic ratios measured on Hawaiian basalts can be matched with the isotopic ratios inferred for recycled ancient oceanic crust. High-precision hafnium isotopic data for lavas from several Hawaiian volcanoes identify old pelagic sediments in their source. These observations support the recycling hypothesis, whereby the mantle source of ocean island basalts includes ancient subducted oceanic crust. Hyperbolic lead-hafnium isotopic relations among Hawaiian basalts further indicate that upper mantle material is not involved in the production of hot spot basalts.
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