Oceanic Lithosphere and Ophiolites; Their similarities and differences.
نویسندگان
چکیده
منابع مشابه
Ophiolites and Their Origins
Ophiolites are the remnants of ancient oceanic crust and upper mantle that were tectonically emplaced into continental margins. They display the only evidence for magmatic, tectonic, and hydrothermal processes associated with seafl oor spreading prior to 170 Ma because no oceanic lithosphere older than this age is preserved in the modern oceans. The occurrence of sheeted dikes, side-byside tabu...
متن کاملThe Oceanic Lithosphere
1. Background: Mid-Ocean Ridges and the oceanic lithosphere 2. Methods of study of the oceanic lithosphere 3. Components of the oceanic lithosphere and their physical properties 4. Structure of the oceanic lithosphere 4.1 ‘Homogeneous’ lithosphere 4.2 ‘Heterogeneous’ lithosphere 4.3 Hot Spot Influenced Lithosphere 4.4.Continent to Ocean Transition 5. Forming the oceanic lithosphere at the ridge...
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The yield strength of oceanic lithosphere determines the mode of mantle convection in a terrestrial planet, and low-temperature plasticity in olivine aggregates is generally believed to govern the plastic rheology of the stiffest part of lithosphere. Because, so far, proposed flow laws for this mechanism exhibit nontrivial discrepancies, we revisit the recent high-pressure deformation data of M...
متن کاملEffective thermal expansivity of Maxwellian oceanic lithosphere
The thermal expansivity of oceanic lithosphere is a key mineral physics parameter that controls the rate of seafloor subsidence. Because of strongly temperature-dependent mantle rheology, effective expansivity for lithosphere as a whole could be substantially lower than indicated by mineral physics data. Viscoelastic modeling indicates that this reduction in expansivity could be as high as ∼15–...
متن کاملGeoid Data and Thermal Structure of the Oceanic Lithosphere
A long-standing question is whether old oceanic lithosphere continues cooling as the boundary layer of a halfspace or approaches thermal equilibrium, as modeled by a finite thickness plate. Although the latter is the most direct inference from seafloor depths and heat flow, other explanations have been proposed. We investigate this issue using published results for the derivative of the oceanic...
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ژورنال
عنوان ژورنال: Journal of Geography (Chigaku Zasshi)
سال: 1995
ISSN: 0022-135X,1884-0884
DOI: 10.5026/jgeography.104.3_361