High-resolution stalagmite stratigraphy supports the Late Holocene tephrochronology of southernmost Patagonia
COMMUNICATIONS EARTH & ENVIRONMENT(2022)
摘要
Volcanic ash layers are important markers for the chronostratigraphy of paleoclimate and paleoenvironmental archives at the southern tip of South America. However, this requires that tephras are well-dated. We report geochemical data from stalagmite MA1 formed in a non-karst cave near Mt. Burney volcano in southernmost Patagonia (~53°S). High-resolution LA-ICP-MS analyses, SEM imagery, EPMA data, and NanoSIMS enable to identify volcanogenic signals during the last 4.5 kyrs from sub-annual trace element variations and tephra particles in distinct laminae. Our new 230 Th/U-chronology of MA1 provides precise dating of tephra from Mt. Burney (MB) and, probably, Aguilera (A) at 4,216 +93 / −193 yrs BP (MB 2 ), 2,291 ± 33 yrs BP (MB 3 ), 853 +41 / −60 yrs BP (MB 4 ) and 2,978 +91 / −104 yrs BP (A 1 ). This unique high-resolution record holds potential to date further eruptions from Southern Andean volcanoes for the tephrochronology in this critical region, and potentially also large-volume explosive volcanism off South America.
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关键词
late holocene tephrochronology,high-resolution
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