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Showing 1–8 of 8 results
Advanced filters: Author: Jerzy Blusztajn Clear advanced filters

  • Sediments, not oceanic crust, dominate barium transfer to arc magmas according to barium isotope variations in volcanic rocks from the South Sandwich Islands arc that arise from material mixing in subduction zones.

    • Yunchao Shu
    • Sune G. Nielsen
    • Tristan J. Horner
    ResearchOpen Access
    Nature Communications
    Volume: 16, P: 1-13

  • Enriched 87Sr/86Sr and 143Nd/144Nd isotope signatures are reported in submarine Samoan lavas. The data provide clear evidence for the presence of recycled upper continental crust in the Samoan mantle, and also support the idea that recycled continental material is involved in the formation of one of the mantle's isotopically-distinct geochemical reservoirs, the so-called enriched mantle 2.

    • Matthew G. Jackson
    • Stanley R. Hart
    • Jamie A. Russell
    Research
    Nature
    Volume: 448, P: 684-687

  • During the last deglaciation, the North Pacific Ocean was characterized by a spike in primary productivity, which has been attributed to iron input. Marine sediment analyses suggest that, instead, the productivity may have been fuelled by deep convection and subsequent stratification.

    • Phoebe J. Lam
    • Laura F. Robinson
    • Lloyd D. Keigwin
    Research
    Nature Geoscience
    Volume: 6, P: 622-626

  • Fluids released from progressive breakdown of minerals at increasing pressure within a mélange may explain the trace element systematics and stable thallium isotope data of the Kamchatka arc lavas from volcanic front to back arc.

    • Yunchao Shu
    • Sune G. Nielsen
    • Maureen Auro
    ResearchOpen Access
    Nature Communications
    Volume: 13, P: 1-14

  • The Nd isotope composition of seawater has been used to reconstruct past changes in the various contributions of different water masses to the deep ocean, with the isotope signatures of endmember water masses generally assumed to have been stable during the Quaternary. Here, the authors show that deep water produced in the North Atlantic had a significantly more radiogenic Nd signature during the Last Glacial Maximum compared to today.

    • Ning Zhao
    • Delia W. Oppo
    • Lloyd D. Keigwin
    ResearchOpen Access
    Nature Communications
    Volume: 10, P: 1-10

  • High 3He/4He ratios in some basalts have been interpreted as evidence for ancient reservoirs preserved in the Earth’s mantle; however, such rocks have never been observed to host the primitive lead-isotopic compositions required for an early formation age. These authors show that Baffin Island and West Greenland lavas exhibit primitive lead-isotope ratios consistent with a mantle source age of 4.55–4.45 billion years, and that their source may be the most ancient accessible reservoir in the mantle.

    • Matthew G. Jackson
    • Richard W. Carlson
    • Jerzy Blusztajn
    Research
    Nature
    Volume: 466, P: 853-856