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      Cooling history of Atlantis Bank oceanic core complex: Evidence for hydrothermal activity 2.6 Ma off axis : THERMAL HISTORY OF ATLANTIC BANK CORE COMPLEX

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          Some remarks on heat flow and gravity anomalies

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            An ultraslow-spreading class of ocean ridge.

            New investigations of the Southwest Indian and Arctic ridges reveal an ultraslow-spreading class of ocean ridge that is characterized by intermittent volcanism and a lack of transform faults. We find that the mantle beneath such ridges is emplaced continuously to the seafloor over large regions. The differences between ultraslow- and slow-spreading ridges are as great as those between slow- and fast-spreading ridges. The ultraslow-spreading ridges usually form at full spreading rates less than about 12 mm yr(-1), though their characteristics are commonly found at rates up to approximately 20 mm yr(-1). The ultraslow-spreading ridges consist of linked magmatic and amagmatic accretionary ridge segments. The amagmatic segments are a previously unrecognized class of accretionary plate boundary structure and can assume any orientation, with angles relative to the spreading direction ranging from orthogonal to acute. These amagmatic segments sometimes coexist with magmatic ridge segments for millions of years to form stable plate boundaries, or may displace or be displaced by transforms and magmatic ridge segments as spreading rate, mantle thermal structure and ridge geometry change.
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              The effect of initial230Th disequilibrium on young UPb ages: the Makalu case, Himalaya

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                Author and article information

                Journal
                Geochemistry, Geophysics, Geosystems
                Geochem. Geophys. Geosyst.
                American Geophysical Union (AGU)
                15252027
                August 2009
                August 2009
                August 28 2009
                : 10
                : 8
                : n/a
                Affiliations
                [1 ]Department of Geology and Geophysics; University of Wyoming; Laramie; Wyoming; 82071; USA
                [2 ]Department of Geosciences; University of Arizona; Tucson; Arizona; 85721; USA
                [3 ]Research Centre for Tectonics, Resources and Exploration, School of Earth and Environmental Sciences; University of Adelaide; Adelaide, South Australia; 5005; Australia
                Article
                10.1029/2009GC002466
                71e50959-81ca-4a15-adcd-35748e12c43a
                © 2009

                http://doi.wiley.com/10.1002/tdm_license_1.1

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