منابع مشابه
Hotspots and Mantle Plumes: Some Phenomenology
The available data, mainly topography, geoid, and heat flow, describing hotspots worldwide are examined to constrain the mechanisms for swell uplift and to obtain fluxes and excess temperatures of mantle plumes. Swell uplift is caused mainly by excess temperatures that move with the lithosphere plate and to a lesser extent hot asthenosphere near the hotspot. The volume, heat, and buoyancy fluxe...
متن کاملHotspots and Mantle Plumes: Constraints from Statistical Analysis
Statistical analysis of the global hotspot distribution is made and current state-of-the-art of the theory of mantle plumes is discussed. Both the fractal dimension analysis and the spherical harmonic correlation are performed to infer some constraints on possible hotspots and mantle plumes sources. Such a joint analysis suggests a compound model, in which the upper mantle exerts strong influen...
متن کاملModulation of mantle plumes and heat flow at the core mantle boundary by plate-scale flow: results from laboratory experiments
We report results from analog laboratory experiments, in which a large-scale flow is imposed upon natural convection from a hot boundary layer at the base of a large tank of corn syrup. The experiments show that the subdivision of the convective flow into four regions provides a reasonable conceptual framework for interpreting the effects of large-scale flow on plumes. Region I includes the are...
متن کاملHot Spots and Mantle Plumes
Hot spots are anomalous areas of surface volcanism that cannot be directly associated with plate tectonic processes. The term hot spot is used rather loosely. It is often applied to any long-lived volcanic center that is not part of the global network of mid-ocean ridges and island arcs. The classic example is Hawaii. Anomalous regions of thick crust on ocean ridges are also considered to be ho...
متن کاملMantle plumes persevere
A recent census suggests that seamounts1 — typically extinct underwater volcanoes — are numerous. It has been estimated that about 125,000 seamounts with a height of more than one kilometre exist on our ocean floors. Most of these are postulated to form at volcanic hotspots that are the surface expressions of mantle plumes — hot material upwelling from Earth’s interior. Yet, many seamounts do n...
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ژورنال
عنوان ژورنال: Earth and Planetary Science Letters
سال: 2002
ISSN: 0012-821X
DOI: 10.1016/s0012-821x(02)00537-x