Silicic Magma Formation in Overthickened Crust: Melting of Charnockite and Leucogranite at 15, 20 and 25 kbar |
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| Authors: | LITVINOVSKY BORIS A; STEELE IAN M; WICKHAM STEPHEN M |
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| Institution: | 1GEOLOGICAL INSTITUTE, SIBERIAN DEPARTMENT OF THE RUSSIAN ACADEMY OF SCIENCES, 6A SAKHYANOVA STR., ULAN-UDE 670047, RUSSIA
2DEPARTMENT OF GEOPHYSICAL SCIENCES, UNIVERSITY OF CHICAGO, 5734 SOUTH ELLIS AVENUE, CHICAGO, IL 60637, USA |
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| Abstract: | Two models of silicic magma formation have been experimentallytested: (1) generation of A-type granite magma by partial meltingof crustal source rocks at depths >50 km; (2) productionof syenite magma by partial melting of quartzofeldspathic rocksat pressures >15 kbar. Melting experiments at 15, 20 and25 kbar were performed on Archaean biotite-bearing charnockiteof opx-bearing granodiorite composition, and on leucogranite.Most experiments were conducted with oxalic acid (OA) to provide2 wt % H2O and |
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