G . J . Kurras

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Seafloor spreading is accommodated by volcanic and tectonic processes along the global mid-ocean ridge system. As spreading rate decreases the influence of volcanism also decreases, and it is unknown whether significant volcanism occurs at all at ultraslow spreading rates (<1.5 cm yr(-1)). Here we present three-dimensional sonar maps of the Gakkel ridge,(More)
A high-resolution mapping and sampling study of the Gakkel ridge was accomplished during an international ice-breaker expedition to the high Arctic and North Pole in summer 2001. For this slowest-spreading endmember of the global mid-ocean-ridge system, predictions were that magmatism should progressively diminish as the spreading rate decreases along the(More)
Never before has a volcanic eruption on a slowor ultraslowspreading mid-ocean ridge been both observed seismically and confirmed on the seafloor. During the first half of 1999, a long-lived volcanic-spreading event occurred on the ultraslow-spreading Gakkel Ridge in the Arctic Ocean. The seismicity associated with this event was unprecedented in duration(More)
808 NATURE | VOL 409 | 15 FEBRUARY 2001 | www.nature.com located near Monte Verde, thought to be the oldest archaeological site in the Americas. Remains interpreted as partially burned plant and animal artefacts in association with hearths have been cited as evidence for the presence of humans and their use of ®re between ,12.5 and 12 C kyr BP. Possibly,(More)
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