Results 31 to 40 of about 382,485 (102)
Crustal evolution and mantle dynamics through Earth history
Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, 2018 Resolving the modes of mantle convection through Earth history, i.e. when plate tectonics started and what kind of mantle dynamics reigned before, is essential to the understanding of the evolution of the whole Earth system, because plate tectonics ...
J. Korenaga
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, 2017 Earth's continental crust is dominantly made of buoyant, felsic igneous material (granitoids), that were ultimately extracted from the mantle as a result of Earth's differentiation. Since felsic melts are not in chemical equilibrium with the mantle, they
J. Moyen +7 more
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Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, 2018 The secular evolution of the Earth's crust is marked by a profound change in average crustal chemistry between 3.2 and 2.5 Ga. A key marker for this change is the transition from Archaean sodic granitoid intrusions of the tonalite–trondhjemite ...
O. Nebel +6 more
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Crustal structure of the spreading plate boundary in Iceland and the north Atlantic from gravity data [PDF]
, 1994 Gravity datasets from two geothermal areas in Iceland, an Iceland-wide gravity dataset, and marine gravity data from the Reykjanes Ridge at 58˚N, which can be seen as the submarine extension of the Icelandic accretionary system, have been studied in this
Field, Paul R.
core
Brazilian Journal of GeologyO Complexo Máfico-ultramáfico Jacurici, localizado na porção nordeste do Cráton São Francisco, é formado por diversas intrusões estratificadas orientadas N-S e hospeda o maior depósito de cromita do Brasil.
João Rodrigo Vargas Pilla Dias +4 more
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Trace element and isotope constraints on crustal anatexis by upwelling mantle melts in the North Atlantic Igneous Province: an example form the Isle of Rum, NW Scotland [PDF]
, 2009 Sr and Nd isotope ratios, together with lithophile trace elements, have been measured in a representative set of igneous rocks and Lewisian gneisses from the Isle of Rum in order to unravel the petrogenesis of the felsic rocks that erupted in the early ...
C. HENRY EMELEUS +14 more
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The crustal geophysical signature of a world-class magmatic mineral system
Scientific Reports, 2018 World-class magmatic mineral systems are characterised by fluid/melt originating in the deep crust and mantle. However, processes that entrain and focus fluids from a deep-source region to a kilometre-scale deposit through the crust are unclear.
G. Heinson +4 more
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Global crustal thickness from neural network inversion of surface wave data [PDF]
, 2007 We present a neural network approach to invert surface wave data for a global model of crustal thickness with corresponding uncertainties. We model the a posteriori probability distribution of Moho depth as a mixture of Gaussians and let the various ...
Andrew Curtis +5 more
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Earth and Planetary Science Letters, 2018 The geodynamic regime of the early Earth remains elusive, with so far proposed hypotheses ranging from stagnant lid convection to rapid plate tectonics. Available geological data are severely limited for the first two billion years of the Earth's history,
J. Rosas, J. Korenaga
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Recent Crustal Deformation in West-Central South America [PDF]
, 2003 I use interferometric synthetic aperture radar (InSAR) to create maps of crustal deformation along the coast and within the volcanic arc of central South America. I image deformation associated with six subduction zone earthquakes, four volcanic centers,
Pritchard, Matthew Earl
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