Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000geoji.142f...1f&link_type=abstract
Geophysical Journal International, Volume 142, Issue 3, pp. 1-5.
Astronomy and Astrophysics
Astronomy
16
Fracture Zones, Hotspots, Iceland, Magmatism, Mantle Transition Zone
Scientific paper
A 3-D teleseismic tomography image of the upper mantle beneath Iceland of unprecedented resolution reveals a subvertical low wave speed anomaly that is cylindrical in the upper 250km but tabular below this. Such a morphological transition is expected towards the bottom of a buoyant upwelling. Our observations thus suggest that magmatism at the Iceland hotspot is fed by flow rising from the mantle transition zone. This result contributes to the ongoing debate about whether the upper and lower mantles convect separately or as one. The image also suggests that material flows outwards from Iceland along the Reykjanes Ridge in the upper 200km, but is blocked in the upper 150km beneath the Tjornes Fracture Zone. This provides direct observational support for the theory that fracture zones dam lateral flow along ridges.
Allen Meghan Rose
Bergsson Bergur H.
Erlendsson Pálmi
Evans Robin J.
Foulger Gillian R.
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