Dacite Petrogenesis on Mid-Ocean Ridges: Evidence for Oceanic Crustal Melting and Assimilation
نویسندگان
چکیده
منابع مشابه
The quantum event of oceanic crustal accretion: impacts of diking at mid-ocean ridges.
Seafloor diking-eruptive events represent the irreducible, quantum events of upper oceanic crustal accretion. They record events by which a large portion of the oceanic crust has formed through geological history. Since 1993, the U.S. Navy's real-time Sound Surveillance System has allowed location of ongoing acoustic signatures of dike emplacement and basalt eruptions at ridge crests in the nor...
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Mid-ocean ridge topography is modeled as the flexural response to loads using a thin plate approximation and setting thermal structure of the lithosphere to allow, but not require, a region of rapid cooling near the axis. Loads on the lithosphere arise from the presence of lowdensity melt, densification due to cooling with distance from the ridge axis, and thermal contraction stresses. We find ...
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We present the first internally consistent calculation which leads to a narrow 'conduit' of rapid vertical advection and melting of mantle under a spreading center. In this model, mantle flow is driven by plate separation and compositional buoyancy. Melt segregation is described as flow through a permeable media. The major new feature is that the viscosity of the mantle is considered to be a st...
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Numerical modeling and anMysis are used to investigate the processes leading to the eruption of mantle-derived magma at mid-ocean ridges. Our model includes the following effects: melting due to decompression, magma migration by percolation, and circulation of the mantle driven by both the oceanic plates and the distribution of buoyancy beneath the ridge. The distribution of buoyancy is due to ...
متن کاملThe Structure of Mid-Ocean Ridges
Mid-ocean ridges provide an important window into the processes of mantle convection and magmatism. The formation, cooling, and eventual subduction of oceanic lithosphere dominate both the large-scale dynamics of the upper mantle and the Earth’s global heat loss. The melt generated during pressure-release melting of the upwelling mantle beneath mid-ocean ridges contributes most of the annual ma...
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ژورنال
عنوان ژورنال: Journal of Petrology
سال: 2010
ISSN: 1460-2415,0022-3530
DOI: 10.1093/petrology/egq056