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An ultraslow-spreading class of ocean ridge
Nature, 2003New 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.
Henry J B, Dick +2 more
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Interlude: The Spreading Oceans
2010Well, the story of the K/AR ages of Iron meteorites ended not with a bang but a whimper. We were at a loss to explain them, so for the moment we concentrated on tuning up the experiment, trying to find some error in our technique. We couldn’t. Yet clearly something was wrong.
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Directional Spreading in Ocean Swell
Ocean Wave Measurement and Analysis (2001), 2002Directional wave spectra derived from a data set measured off the west coast of New Zealand are used to investigate the directional spreading within swell. The location where the measurements were made is particularly useful for the study as a more or less constant swell component originating from the Southern Ocean is observed in the sea states.
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A mechanism for ocean-floor spreading
Philosophical Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences, 1971Abstract I wish to suggest a mechanism for ocean-floor spreading, other than deep mantle convection cells. If the geotherm intersects the mantle solidus at the base of the upper mantle, a partly melted layer will result. It will be less dense than the overlying unmelted garnet peridotite lithosphere and the situation will be ...
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Metallogenesis at oceanic spreading centres
Journal of the Geological Society, 1980The World mid-Ocean Ridge System is a volcanically active area of the sea floor some tens of thousands of km in length, at which new ocean crust is being created. Associated with crustal formation is the leaching of newly solidified lavas by circulating sea water, leading to the formation of metal-rich hydrothermal solutions ...
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Spreading rate dependence of three-dimensional structure in oceanic spreading centres
Nature, 1990SEGMENTATION by transform faults and other types of along-axis discontinuity1 is a well described but poorly explained characteristic of oceanic spreading centres. Here we use numerical experiments to explore the dynamics of mantle flow and melting beneath a mid-ocean ridge.
Jason Phipps Morgan
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2011
A midocean ridge, an underwater mountainous feature, extends for a length of about 65,000 km as a single continuous body in the global oceans. It is a window to the Earth's interior, through which magma is continuously upwelling and drives the lithospheric plates on either side in order to accommodate newly accreted crust. Many of the oceanic ridges in
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A midocean ridge, an underwater mountainous feature, extends for a length of about 65,000 km as a single continuous body in the global oceans. It is a window to the Earth's interior, through which magma is continuously upwelling and drives the lithospheric plates on either side in order to accommodate newly accreted crust. Many of the oceanic ridges in
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Metallogenesis at oceanic spreading centres
Journal of the Geological Society, 1979Report of a combined OGM and Marine, Mineral Deposits and Volcanic Studies Group Meeting held at Burlington House, 21–22 November 1978. The meeting was organized by Dr D. S. Cronan. Metalliferous sediments associated with active spreading centres can be divided into 3 types: (1) sulphide deposits associated with ...
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Spreading of the Ocean Floor: New Evidence
Science, 1966It is suggested that the entire history of the ocean basins, in terms of ocean-floor spreading, is contained frozen in the oceanic crust. Variations in the intensity and polarity of Earth's magnetic field are considered to be recorded in the remanent magnetism of the igneous rocks as they solidified and cooled through the Curie temperature at the crest
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Spreading cycles in the Pacific Ocean
Oceanology, 2008Changes in the spreading rates in the Pharallon-Pacific-Izanagi (Kula) triple junction during the Cretaceous and Cenozoic are revised using new data of the dynamics of the Pacific plate. The cyclic character of the spreading is recognized, and the stages of its acceleration and deceleration are distinguished.
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