Publikationsdatum:
2023-02-09
Beschreibung:
Despite their large number and in contrast to seamount chains, small solitary seamounts/seamount groups have rarely been sampled and therefore their origins remain enigmatic. Here we present 40Ar/39Ar, trace element and Nd‐Pb‐Hf isotope data from the solitary Demenitskoy Seamount, the isolated Tolkien seamount group and the Krylov Seamount and Ridge in the Canary Basin. Their chemical compositions range from intraplate ocean‐island‐basalt (Demenitskoy) to normal‐ and enriched‐mid‐ocean‐ridge‐basalt types (Tolkien and Krylov system, respectively). Lavas from all three seamount groups, however, show geochemical evidence for involvement of enriched (Canary/Cape Verde) plume material. Seismic tomography shows that large areas around these mantle plumes are affected by dispersal of presumably low‐velocity material, which also could have fed nearby isolated seamounts with diffusely‐upwelling plume material. This process may be extremely widespread but has been poorly studied to date.
Materialart:
Article
,
PeerReviewed
Format:
text
Format:
text
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