Results 221 to 230 of about 17,505 (279)
Formation of the 15 Å phase as the most expanded hydrated mineral in cold subduction zone. [PDF]
Nat CommunBang Y +9 more
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Aegirine-melt element partitioning in alkaline magmatic systems
, 2016 Beard, C. +3 more
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Volatiles in alkaline magmatism
Lithos, 1990Abstract Gases extracted during fusion of volcanic glasses substantiate other sources of evidence that alkaline magmatism is distinguished from calc-alkaline by higher CO2 + SO2 contents, with relatively smaller proportions of H2O. In addition to higher C and S activity, alkaline magmas are characterised by high Cl and F, which are released with ...
C.M. Hampton, D.K. Bailey
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Geochemistry International, 2006
Geochronological data (∼1800 dates) have been analyzed by the probabilistic statistical analysis of samplings of different subalkaline and alkaline rocks through the whole of geological time. The distribution of five groups of subalkaline and alkaline rocks within the Late Archean-Phanerozoic are strictly controlled by mantle cycles, which were ...
V. N. Glaznev, Yu. A. Balashov
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Geochronological data (∼1800 dates) have been analyzed by the probabilistic statistical analysis of samplings of different subalkaline and alkaline rocks through the whole of geological time. The distribution of five groups of subalkaline and alkaline rocks within the Late Archean-Phanerozoic are strictly controlled by mantle cycles, which were ...
V. N. Glaznev, Yu. A. Balashov
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Precambrian alkaline magmatism
Lithos, 1996Abstract There are very few alkaline rocks in Precambrian terrains. The oldest well-documented examples are 2.7 Ga trachytes and leucite phonolites from the Kirkland Lake region of Canada. These rocks are highly potassic, with major- and trace-element characteristics closely resembling those of shoshonitic lavas in modern island arcs.
Janne Blichert-Toft +2 more
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First alkaline magmatism during Iberia–Newfoundland rifting
Terra Nova, 2008AbstractThe age and origin of alkaline rocks emplaced into the sediments of the rift‐related continental Lusitanian basin were investigated to constrain earliest magmatic activity occurring prior to oceanic plate formation between Iberia and Newfoundland.
Marion Grange +4 more
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Intraplate alkaline magmatism: mineralogy and petrogenesis
Mineralogical Magazine, 2003This thematic set contains seven papers arising from the session of the same name at the 18th General Meeting of the International Mineralogical Association (IMA), held in Edinburgh in September 2002. This session was a combination of two separate original proposals: a session on Intraplate Alkaline Magmatism that was to be a follow-up to the ‘Friends ...
Kathryn Goodenough +2 more
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Introduction to Special Section on Alkaline Arc Magmatism
Journal of Geophysical Research: Solid Earth, 1989Alkaline magmas are an uncommon but intriguing member of many of the Earth's volcanic arc systems. This peculiar magmatism is generally associated with perturbations to the “normal” tectonic setting of arc magmatism. In December 1986, we convened a symposium at the AGU Fall Meeting to explore connections between the tectonic environments of alkaline ...
Stephen E. Box, Martin F. J. Flower
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The Cenozoic alkaline magmatism in central-northern Madagascar: a brief overview [PDF]
Periodico Di Mineralogia, 2007 The Cenozoic volcanic rocks of Madagascar were emplaced as lavas, pyroclastic rocks, dykes, and plugs, and range in composition from olivine melilitites, basanites and alkali basalts, to phonolites, trachytes and rhyolites. The ultrabasic- basic lithologies are dominant, in particular basanites and tephrites, with less abundant, mildly evolved ...
MELLUSO, LEONE +8 more
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Ultra-alkaline magmatism with or without rifting
Tectonophysics, 1987Abstract Examination of the relationship between rifting and types of alkaline magmatism reveals features at present overlooked by current theories of plate tectonics. For example, in East Africa the majority of ultra-alkaline igneous rocks (carbonatites, melilitites, nephelinites, rijolites) lie west of the site of the Gregory Rift Valley and pre ...
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