Temperature in the Lower Mantle
نویسندگان
چکیده
منابع مشابه
Spin transition zone in Earth's lower mantle.
Mineral properties in Earth's lower mantle are affected by iron electronic states, but representative pressures and temperatures have not yet been probed. Spin states of iron in lower-mantle ferropericlase have been measured up to 95 gigapascals and 2000 kelvin with x-ray emission in a laser-heated diamond cell. A gradual spin transition of iron occurs over a pressure-temperature range extendin...
متن کاملStability of magnesiowustite in Earth's lower mantle.
Magnesiowüstite [(Mg,Fe)O] is the second most abundant mineral of Earth's lower mantle. Understanding its stability under lower mantle conditions is crucial for interpreting the physical and chemical properties of the whole Earth. Previous studies in an externally heated diamond anvil cell suggested that magnesiowüstites decompose into two components, Fe-rich and Mg-rich magnesiowüstites at 86 ...
متن کاملPhase transition in MgSiO3 perovskite in the earth’s lower mantle
A new polymorph of MgSiO3 more stable than the Pbnm-perovskite phase has been identified by first-principles computations. It has the CaIrO3 structure with Cmcm symmetry and consists of SiO3 layers intercalated by eightfoldcoordinated Mg ions. High-temperature calculations within the quasiharmonic approximation give a volume change of f 1.5% and a Clapeyron slope of f 7.5F 0.3 MPa/K at f 2750 K...
متن کاملInfluences of Lower-Mantle Properties on the Formation of Asthenosphere in Oceanic Upper Mantle
Asthenosphere is a venerable concept based on geological intuition of Reginald Daly nearly 100 years ago. There have been various explanations for the existence of the asthenosphere. The concept of a plume-fed asthenosphere has been around for a few years due to the ideas put forth by Yamamoto et al.. Using a two-dimensional Cartesian code based on finite-volume method, we have investigated the...
متن کاملLower mantle composition and temperature from mineral physics and thermodynamic modelling
E. Mattern,1 J. Matas,1 Y. Ricard2 and J. Bass3 1Laboratoire de Sciences de la Terre, CNRS UMR 5570, Ecole normale supérieure de Lyon, 46, allée d’Italie, 69364 Lyon cedex 07, France. E-mails: [email protected] and [email protected] 2Laboratoire de Sciences de la Terre, CNRS UMR 5570, Université Claude Bernard Lyon1, 43Bd du 11novembre, Bat. Géode, 69622 Villeurbanne cedex, France...
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ژورنال
عنوان ژورنال: Geophysical Journal International
سال: 1972
ISSN: 0956-540X,1365-246X
DOI: 10.1111/j.1365-246x.1972.tb02345.x