Experimental constraints on the formation of silicic magmas
A rich history of experimental petrology has revealed the paths by which silicic igneous rocks follow mineral-melt equilibria during differentiation. Subdividing these rocks by 'molar Al versus Ca + Na + K' illustrates first-order differences in mineralogy and gives insight into formation...
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| Veröffentlicht in: | Elements (Quebec) 2016-04, Vol.12 (2), p.109-114 |
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| creator | Scaillet, Bruno Holtz, François Pichavant, Michel |
| description | A rich history of experimental petrology has revealed the paths by which silicic igneous rocks follow mineral-melt equilibria during differentiation. Subdividing these rocks by 'molar Al versus Ca + Na + K' illustrates first-order differences in mineralogy and gives insight into formation mechanisms. Peraluminous magmas, formed by partial melting of sediments, largely owe their attributes and compositions to melting reactions in the protoliths, whereas most metaluminous felsic magmas record both continental and mantle inputs. Peralkaline rhyolites are mainly derived from either protracted crystallization or small degrees of partial melting of basalt, with only a marginal crustal contribution. Most silicic magmas hold 3-7 wt% H2Omelt, which is inversely correlated with pre-eruptive temperature (700 °C to >950 °C) but unrelated to their reduced/oxidized state. |
| doi_str_mv | 10.2113/gselements.12.2.109 |
| format | Article |
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| ispartof | Elements (Quebec), 2016-04, Vol.12 (2), p.109-114 |
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| language | eng |
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| subjects | A-type granites acidic composition alkali metals alkaline earth metals aluminum basalts calcium chemical composition crystallization Earth Sciences experimental studies felsic composition granites I-type granites igneous and metamorphic rocks igneous rocks magmas magmatic differentiation melting metals metaluminous composition partial melting peralkalic composition peraluminous composition Petrology phase equilibria plutonic rocks potassium protoliths rhyolites S-type granites Sciences of the Universe sodium temperature volcanic rocks Volcanology water content |
| title | Experimental constraints on the formation of silicic magmas |
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