The observed velocity perturbations in the mantle beneath the Massif Central can be explained nearly entirely by temperature variations. Temperatures approach the dry peridotite solidus in the depth range from 50 to 90 km just below Cenozoic volcanic areas, but no large-scale partial melting is ...
Is the upper mantle solid or liquid? The upper mantle is technically solid, but it moves slowly over geologic time like a fluid. This is because of the intense heat and pressures in the interior. As depth increases, the pressure, temperature, and density also increase. The material is hot...
The thickness of thermal lithosphere is also estimated assuming its bottom has a mantle adiabatic temperature of 1300掳C. Our results show that the study area exhibits an alternate distribution pattern with three weak zones and two stable blocks. The Qilian orogen, the Shanxi rift system and the...
For example, a thicker crust would imply that Mars exchanged heat with the exterior less efficiently, and the mantle convection could have stopped entirely. The InSight mission recently motivated a wide range of other studies regarding the Martian internal structure13. It is clear from the rock ...
The development is described of a technique for the experimental determination of post-shock temperatures, and its application to several metals and silicates shocked to pressures in the range 5 to 30 GPa. The technique utilizes an infra-red radiation detector to determine the brightness temperature ...
Experiments were conducted at 0.65 and 0.8GPa in the temperature range 1,170–1,290°C. In this P-T range, representing conditions encountered in the transition zone (thermal boundary layer) between the asthenosphere and the lithosphere underneath oceanic spreading centres, the melt is subjected ...
A low water content limit in olivine in a given range of upper mantle temperature and pressure defines the ‘dry’ condition here and constructs an upper limit of effective viscosity at a constant strain rate. We define the effective viscosities for the ‘dry’ (i = 0) and ‘wet’ (...
apparatus (D-DIA) on single crystals of Mg2SiO4 forsterite (Fo100) and San Carlos (SC) olivine (Fo89), at P ranging from 5.7 to 9.7 GPa, temperature T = 1473 and 1673 K, differential stress σ in the range 140–1500 MPa, and in water-poor ...
RegisterLog in Sign up with one click: Facebook Twitter Google Share on Facebook Upper Devonian [′əp·ər də′vō·nē·ən] (geology) The latest epoch of the Devonian period of geologic time, beginning about 365 million years ago. ...
aThanksgiving Day is in December. 感恩天是在12月。[translate] aHeat flow, temperature, and electrical conductivity of the crust and upper mantle in the U.S.S.R. 热流、温度和外壳和上地幔的电导率在苏联。[translate]