| Many experiments suggest that ancient subduction-related metasomatism affected OIB mantle sources long before island magmatism. |
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| In the cooler middle and upper crust, felsic magmatism and aqueous metasomatism are most important. |
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| In both areas, the silicic magmatism is thought to have been a result of intrusion of mantle-derived mafic magmas into extending crust. |
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| The occurrence of these felsic extrusive igneous rocks potentially provides key information on the complex interplay of magmatism and tectonics. |
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| The revised age for the Jozini Formation rhyolites is also of significance for petrogenetic models proposed for the Karoo silicic magmatism. |
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| Granitic magmatism at convergent margins is intrinsic to the growth of continents and is an integral part of Andean geology. |
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| Both radiometric and biostratigraphic data indicate the onset of magmatism in late Mid-Jurassic time. |
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| In the northern Cordillera lower Paleozoic alkalic and potassic mafic magmatism is linked with rifting of the Selwyn Basin. |
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| There are no mafic dykes or intrusions of similar age to the granitic rocks that could imply contemporaneous mafic magmatism. |
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| The region east of the gravity lineament has witnessed intensive magmatism and basin development since Mesozoic time. |
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| Thus, granites can form both by magmatism and granitization or a combination of the two. |
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| Our geochronology has identified major early Ordovician magmatism within the Slishwood Division. |
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| Prior to Cretaceous magmatism, the region underwent three major episodes of deformation. |
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| This magmatism is typically of gabbroic to granitic composition and also shows evidence of mixed sedimentary and mantle-like sources. |
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| In both cases, the sequence of events started with extensional basin magmatism and culminated in emplacement of plutons, passing through basin subsidence. |
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| A further part deals with deposits associated with alkalic magmatism. |
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| The contemporaneity in ophiolite formation and felsic arc magmatism suggests that intraoceanic subduction started soon after the opening of the ocean basin. |
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| These igneous rocks record the extensive magmatism that resulted from northward subduction of Neotethyan oceanic lithosphere beneath the Lhasa terrane. |
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| The pre-Andean and Andean orogenies are separated by a Mesozoic transitional period, which is marked by a very different style of tectonism and magmatism. |
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| The age of the Carrock microgranite provides further evidence that both calc-alkaline and tholeiitic magmas were available during Caradoc magmatism in the Lake District. |
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| When a subcontinental plume hits such a thin spot, the result would be voluminous shallow magmatism. |
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| They are dominantly mafic, but also can have significant ultramafic and silicic components, and some are dominated by silicic magmatism. |
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| Underwater magmatism commenced during the Cretaceous, and reached the ocean's surface during the Miocene. |
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| Shoshonitic magmatism younged southwards in the Superior Province, commensurate with the southwardly diachronous accretion of allochthonous subprovinces. |
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| The arc magmatism occurs one hundred to two hundred kilometers from the trench and approximately one hundred kilometers above the subducting slab. |
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| Mineral ore bodies have also been formed within the crust through a process of ore genesis, resulting from actions of magmatism, erosion, and plate tectonics. |
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