Results 341 to 350 of about 549,065 (394)
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Nature and composition of the continental crust: A lower crustal perspective
, 1995Geophysical, petrological, and geochemical data provide important clues about the composition of the deep continental crust. On the basis of seismic refraction data, we divide the crust into type sections associated with different tectonic provinces ...
R. Rudnick, D. Fountain
semanticscholar +1 more source
Seismic velocity structure and composition of the continental crust: A global view
, 1995Seismic techniques provide the highest-resolution measurements of the structure of the crust and have been conducted on a worldwide basis. We summarize the structure of the continental crust based on the results of seismic refraction profiles and infer ...
N. Christensen, W. Mooney
semanticscholar +1 more source
Empirical relations between elastic wavespeeds and density in the Earth's crust
, 2005A compilation of compressional-wave ( V p) and shear-wave ( V s) velocities and densities for a wide variety of common lithologies is used to define new nonlinear, multivalued, and quantitative relations between these properties for the Earth's crust ...
T. Brocher
semanticscholar +1 more source
The Amount of Recycled Crust in Sources of Mantle-Derived Melts
Science, 2007Plate tectonic processes introduce basaltic crust (as eclogite) into the peridotitic mantle. The proportions of these two sources in mantle melts are poorly understood.
A. Sobolev +19 more
semanticscholar +1 more source
1982
This chapter discusses the seismic structure of oceanic and continental crust, explains complexities of the Moho, and reviews principal crustal types including both geologic and geophysical characteristics. It also reviews controls of continental size, heat flow, heat production, exhumation, cratonization, and processes operating in the continental ...
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This chapter discusses the seismic structure of oceanic and continental crust, explains complexities of the Moho, and reviews principal crustal types including both geologic and geophysical characteristics. It also reviews controls of continental size, heat flow, heat production, exhumation, cratonization, and processes operating in the continental ...
openaire +6 more sources
, 2015
The composition of much of Earth’s lower continental crust is enigmatic. Wavespeeds require that 10–20% of the lower third is mafic, but the available heat-flow and wavespeed constraints can be satisfied if lower continental crust elsewhere contains ...
B. Hacker, P. Kelemen, M. Behn
semanticscholar +1 more source
The composition of much of Earth’s lower continental crust is enigmatic. Wavespeeds require that 10–20% of the lower third is mafic, but the available heat-flow and wavespeed constraints can be satisfied if lower continental crust elsewhere contains ...
B. Hacker, P. Kelemen, M. Behn
semanticscholar +1 more source
International Journal of Dermatology, 2013
A 15-year-old Chinese boy presented to us with symmet- (a) ric crusts on his cheeks and the dorsal surface of his nose. Pomade disease (or pomade crust) is a misdiagnosed thick crusting excessively treated with topical ointments and 1 oils and not responsive to topical corticosteroids.
V. Grandi +5 more
openaire +4 more sources
A 15-year-old Chinese boy presented to us with symmet- (a) ric crusts on his cheeks and the dorsal surface of his nose. Pomade disease (or pomade crust) is a misdiagnosed thick crusting excessively treated with topical ointments and 1 oils and not responsive to topical corticosteroids.
V. Grandi +5 more
openaire +4 more sources
Remnants of ≥3800 Ma crust in the Chinese part of the Sino-Korean craton
, 1992Ion microprobe U-Pb analyses of zircons from the Sino-Korean craton have identified remnants of ≥3800 Ma crust at two localities—near Caozhuang east of Beijing, and near Anshan, northeast China.
D. Liu +4 more
semanticscholar +1 more source
1942
Chapter I gave a brief outline of those rocks which can probably be said to build up the earth’s crust. This important question will now have to be examined somewhat more closely. It should first be noted, however, that opinions differ considerably as regards the composition of the terrestrial crust though all agree on a few fundamental points.
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Chapter I gave a brief outline of those rocks which can probably be said to build up the earth’s crust. This important question will now have to be examined somewhat more closely. It should first be noted, however, that opinions differ considerably as regards the composition of the terrestrial crust though all agree on a few fundamental points.
openaire +2 more sources
, 2008
Rock-mechanics experiments, geodetic observations of postloading strain transients, and micro- and macrostructural studies of exhumed ductile shear zones provide complementary views of the style and rheology of deformation deep in Earth's crust and upper
R. Bürgmann, G. Dresen
semanticscholar +1 more source
Rock-mechanics experiments, geodetic observations of postloading strain transients, and micro- and macrostructural studies of exhumed ductile shear zones provide complementary views of the style and rheology of deformation deep in Earth's crust and upper
R. Bürgmann, G. Dresen
semanticscholar +1 more source