Results 251 to 260 of about 2,366,156 (316)

A model for the upper mantle

Journal of Geophysical Research, 1962
The occurrence of a low-velocity zone in the upper mantle has been attributed to the effect of high temperature gradients. If the upper mantle is homogeneous, it is shown that the required temperature gradients would lead to extensive melting. Since this consequence is unacceptable, it appears necessary to consider nonhomogeneous models.
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On the structure of the upper mantle

Bulletin of the Seismological Society of America, 1966
Abstract From apparent velocities of first arrivals across the Tonto Forest array for epicentral distances from 11° to 29° Niazi and Anderson derived a structure of the upper mantle deviating markedly from other structures as determined of late. It is found that on a different interpretation their data are in good accord with the Lehmann
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The nature of the upper mantle

Mineralogical Magazine, 1981
AbstractThe nature of the upper mantle below the ancient cratonic areas can be deduced by study of the xenolith suites in kimberlites. Studies on the proportions of xenoliths, together with their mineralogy and chemistry, suggest an upper mantle containing an upper harzburgite zone and a lower lherzolite zone, with both of these zones containing ...
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Palaeoanisotropy in the upper mantle

Nature, 1977
CARTER1 has reviewed advances in understanding the steady-state flow of rocks with particular reference to the behaviour and anisotropic alignment of rocks in the upper mantle. Some form of high-temperature creep is clearly responsible for the distribution of continents and their first-order structures2. The difficulty is specifying the exact mechanism
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Three thermometers for Earth’s upper mantle

Physics Today, 2014
A new analysis of global data for mid-ocean ridges uncovers new temperature proxies for probing beneath our planetary crust. A new analysis of global data for mid-ocean ridges uncovers new temperature proxies for probing beneath our planetary crust.
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Rheology of the Upper Mantle and the Mantle Wedge: A View from the Experimentalists

, 2013
G. Hirth, D. Kohlstedt
semanticscholar   +1 more source

Zinc isotope fractionation during mantle melting and constraints on the Zn isotope composition of Earth’s upper mantle

, 2017
Ze‐Zhou Wang, Sheng‐Ao Liu, Jingao Liu, Jian Huang, Yan Xiao, Zhuyin Chu, Xin-miao Zhao, Limei Tang   +7 more
semanticscholar   +1 more source

Seismic evidence of on-going sublithosphere upper mantle convection for intra-plate volcanism in Northeast China

, 2016
Zhen Guo, Y. J. Chen, J. Ning, Yingjie Yang, J. C. Afonso, Youcai Tang   +5 more
semanticscholar   +1 more source

Experimental petrology of peridotites, including effects of water and carbon on melting in the Earth’s upper mantle

Physics and chemistry of minerals, 2015
D. Green
semanticscholar   +1 more source

Fault-controlled hydration of the upper mantle during continental rifting

, 2016
G. Bayrakci, T. Minshull, D. Sawyer, T. Reston, D. Klaeschen, C. Papenberg, C. Ranero, J. Bull, R. Davy, D. Shillington, M. Pérez‐Gussinyé, J. Morgan   +11 more
semanticscholar   +1 more source