A one-plume model of martian mantle convection

Article Abstract:

A three-dimensional convection model incorporating an endothermic phase transition close to the core-mantle boundary is used to analyze the convective evolution of the martian mantle. The results show the development of a single-plume pattern of convection on Mars consistent with the volcanic distribution, gravity field shape and the gross tectonic stress pattern of the planet. Thermal convection in the martian mantle is unlike that in the Earth. A single large upswelling region exists beneath the Tharsis region of Mars.

Research, Mars (Planet), Natural history, Convection (Fluid dynamics), Convection (Astrophysics)

---

Scum of the Earth after all

Article Abstract:

Heat released by earth plates via conduction into the atmosphere and oceans is responsible for the formation of continents. Greater heat loss makes for increased arc subduction sites and thus more continental crust. Sedimentary rocks are proof of initiation of the continental crust. Sweeping together of many island arcs in oceans generates individual continents. Submarine oceanic plateaus promote arc volcanism to give arc-magma, which results in rock-mass formation due to plume-generated plateau.

Observations, Growth, Rocks, Sedimentary, Sedimentary rocks, Submarine topography, Continents

---

High (sup)3He/(sup)4He ratios in picritic basalts from Baffin Island and the role of a mixed reservoir in mantle plumes

Article Abstract:

Research indicates that olivine phenocrystals in picritic basalts exhibit the highest magnetic (sup)3He/(sup)4He ratios and basalts rich in (sup)3He are derived from melts of depleted upper-mantle rocks, suggesting that a (sup)3He-recharged depleted mantle reservoir may be the main source of high (sup)3He/(sup)4He ratios in mantle plumes.

United Kingdom, Basalt, Mantle (Geology), Properties, Helium isotopes

Similar abstracts:

• Abstracts: Earth's core not so hot. Melting of iron at the physical conditions of the Earth's core. Geodynamic estimates of the viscosity of the Earth's inner core
• Abstracts: An integrative model of the lactational and environmental control of mating in female rhesus monkeys. Rhesus monkeys, Macaca mulatta, know what others can and cannot hear
• Abstracts: Geochemical constraints on mantle melting during creation of the North Atlantic basin. Evidence from the rare-earth-element record of mantle melting for cooling of the Tertiary Iceland plume
• Abstracts: Quest for low-degree mantle melts. The making of metal deposits. Melts caught in the act
• Abstracts: A protocol for plant conservation by translocation in threatened lowland Fynbos. How taxonomists can bridge the gap between taxonomy and conservation science

This website is not affiliated with document authors or copyright owners. This page is provided for informational purposes only. Unintentional errors are possible.