Petrological and Experimental Constraints on the Pre-eruption Conditions of Holocene Dacite from Volcan San Pedro (36{degrees}S, Chilean Andes) and the Importance of Sulphur in Silicic Subduction-related Magmas |
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| Authors: | COSTA, FIDEL SCAILLET, BRUNO PICHAVANT, MICHEL |
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| Affiliation: | INSTITUT DES SCIENCES DE LA TERRE D'ORLÉANS, UMR 6113 CNRS-UO, 1A RUE DE LA FÉROLLERIE, 45071 ORLÉANS, FRANCE |
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| Abstract: | We present an experimental and petrological study aimed at estimatingthe pre-eruptive conditions of a Holocene dacitic lava fromVolcán San Pedro (36°S, Chilean Andes). Phase-equilibriumexperiments were performed at temperatures (T) from 800 to 950°C,and mainly at 200 MPa, but also at 55, 150, and 406 MPa. Oxygenfugacity (fO2) ranged from the NiNiO buffer (NNO) to3·5 log units above (NNO + 3·5), and water contentsfrom |
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| Keywords: | : sulphur dacite experiments biotite Andes |
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