Thermodynamics of lateral dike propagation: Implications for crustal accretion at slow spreading mid-ocean ridges
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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Studies of the structure of mid-ocean ridges and the processes involved at these accreting plate boundaries have played an important role in the development of plate tectonics models over the last two decades. During this time our concept of the accretion/spreading process has evolved from a two-dimensional, steady-state picture to a three dimensional, time-dependent view of the volcanism and r...
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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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At fast and superfast spreading mid-ocean ridges, such as the East Pacific Rise, a plate boundary is defined by a narrow (tens to hundreds of meters wide) neovolcanic zone within which the bulk of the upper oceanic crust is created. However, detailed near-bottom observations indicate that the volcanic construction may occasionally persist several kilometers off of the ridge axis. It has been pr...
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ژورنال
عنوان ژورنال: Journal of Geophysical Research: Solid Earth
سال: 1998
ISSN: 0148-0227
DOI: 10.1029/97jb03105