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magmatism |
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magmatism [′mag·mə‚tiz·əm] (petrology) The formation of igneous rock from magma. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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Between 90 and 95 million years ago (Ma), a tectonic change from convergent-oblique to subduction-dextral strike-slip movement resulted in an episode of magmatism and the emplacement of the Tombstone series of intermediate to felsic plutons. A basic tenet of this model is that tectonism and magmatism [the formation of molten material] at Beta Regio and western Aphrodite are dominated by the evolution of plume heads or blobs as they rise to the base of the lithosphere and spread laterally," the authors write in the November GEOPHYSICAL RESEARCH LETTERS. 2001; David, in press), the Meso- to Eoarchean crustal components were variably assimilated by magmas produced during several episodes of pervasive Neoarchean magmatism and reworked by deformation and metamorphism. |
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