The eruptive and magmatic history of the youngest pulse of volcanism at the Valles caldera: Implications for successfully dating late Quaternary eruptions
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- 作者：Matthew J. Zimmerera ; ; John Laffertyb ; Matthew A. Coblec
- 关键词：Geochronology ; Valles caldera ; 40Ar/39Ar dating ; U/Th disequilibrium dating ; Magmatism ; Volcanic hazards
- 刊名：Journal of Volcanology and Geothermal Research
- 出版年：2016
- 出版时间：15 January 2016
- 年：2016
- 卷：310
- 期：Complete
- 页码：50-57
- 全文大小：861 K
文摘
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40Ar/39Ar dating indicates that the youngest eruptions at the Valles caldera occurred at 74.4 ± 1.3 ka and 68.3 ± 1.5 ka.
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U/Th dating of zircon crystal faces indicates protracted magmatism extending from the eruption age to at least 350 ka.
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The extended period of zircon crystallization documents a previously unknown pulse of magmatism at the Valles caldera.
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Combining these two dating methods will be useful for understanding the volcanic history of other late Quaternary systesm.