As magma rises up to the surface, some may get trapped at the crust-mantle boundary, accumulating and eventually solidifying, thickening the crust.
Magmatic underplating occurs when basaltic magmas are trapped during their rise to the surface at the Mohorovičić discontinuity or within the crust.[1] Entrapment (or 'stalling out') of magmas within the crust occurs due to the difference in relative densities between the rising magma and the surrounding rock. Magmatic underplating can be responsible for thickening of the crust when the magma cools.[1] Geophysical seismic studies (as well as igneous petrology and geochemistry) utilize the differences in densities to identify underplating that occurs at depth.[1]
^ abcCox, K.G. (1993). "Continental Magmatic Underplating". Philosophical Transactions of the Royal Society A. 342 (1663): 155–166. Bibcode:1993RSPTA.342..155C. doi:10.1098/rsta.1993.0011. JSTOR 54188. S2CID 83865999.
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Magmaticunderplating occurs when basaltic magmas are trapped during their rise to the surface at the Mohorovičić discontinuity or within the crust. Entrapment...
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kilometers (12 to 22 mi) thick. Both shortening of the crust and magmaticunderplating contribute to thickening of the crust.: 6 Volcanic arcs are characterized...
of independent terranes. The Mozambique Belt rocks formed from magmaticunderplating and a period of residence in the mid-lower crust followed by cooling...
upward flow of the asthenosphere results in decompression melting, magmaticunderplating and some volcanism that may occur in the rift area. North Atlantic...
through the dehydration of a subducting hydrated oceanic plate or magmaticunderplating. The composition of a parent rock has a direct effect on the composition...
In geology, igneous differentiation, or magmatic differentiation, is an umbrella term for the various processes by which magmas undergo bulk chemical change...
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turbidites. The lower crust contains duplexed oceanic lithosphere, and magmaticunderplating. Structures in the Eastern thrust belt are oriented north–south...
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Altiplano and caused the development of this plateau either from magmaticunderplating and/or from crustal shortening; eventually the crust there became...
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any cumulates in the mantle. Another is heating of the lower crust by underplating basaltic magma, which produces felsic magma directly from crustal rock...
oceanic plate breaks apart from the crust and sinks into the mantle, underplating continues to occur. At the same time, the sinking oceanic plate starts...
of primary basaltic magmas, magma storage at the base of the crust (underplating by dense, mafic magma as it ascends), and magma homogenization. The underplated...
an underplating process will take place, the assimilation and fractional crystallization of primary magma and lower crustal rocks forms underplate at...
Paleoprotozoic and Archean cratons. These large deposits formed by mantle underplating impacts to metasomatized lithospheric mantle, and smaller deposits form...
(plume) that accommodates the formation of crustal thickening by magmaticunderplating and volcanic activities associated with the thin lithosphere. Planetary...
post-tectonic magmatism at ca. 1.715 Ga (the Harney Peak granite). This tectonic-magmatic interval is 50–60 million years younger than that reported for the Hearne-Superior...
pressure-temperature-time paths were recorded. Metamorphism was caused by the underplating and the intrusion of mantle magma with isobaric cooling. It was not related...
positioning consistent with subduction and geologists have interpreted it as underplating leading to partial melting, the formation of trondhjemitic magmas rich...
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Imbricate fans can be found in the Sub-Himalayan Sequence (Fig. 3). Underplating — Rock units are thrust and piled up section by section (Fig. 5). At...
although a significant part of the uplift is thought to have been caused by underplating at the end of the Paleocene. The amount of Neogene exhumation is particularly...
generalised. They are the subduction model, the extension model the magma underplating mode, and the lithospheric folding model. There were several major tectonic...
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