Evolution of Holocene Dacite and Compositionally Zoned Magma, Volcán San Pedro, Southern Volcanic Zone, Chile
نویسندگان
چکیده
Volcán San Pedro in the Andean Southern Volcanic Zone (SVZ) Consequently, the role of young, unradiogenic hydrous gabbro in Chile, comprises Holocene basaltic to dacitic lavas with trace generating dacite and contaminating basalt may be underappreciated element and strontium isotope ratios more variable than those of in the SVZ. most Pleistocene lavas of the underlying Tatara–San Pedro complex. Older Holocene activity built a composite cone of basaltic andesitic and silicic andesitic lavas with trace element ratios distinct from
منابع مشابه
Petrological and Experimental Constraints on the Pre-eruption Conditions of Holocene Dacite from Volcán San Pedro (36 S, Chilean Andes) and the Importance of Sulphur in Silicic Subduction-related Magmas
We present an experimental and petrological study aimed at estimating the pre-eruptive conditions of a Holocene dacitic lava from Volcán San Pedro (36 S, Chilean Andes). Phase-equilibrium experiments were performed at temperatures (T) from 800 to 950 C, and mainly at 200MPa, but also at 55, 150, and 406MPa. Oxygen fugacity ( fO2) ranged from the Ni---NiO buffer (NNO) to 3 5 log units above (NNO...
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