2026-06-07T19:59:55Zhttps://docta.ucm.es/rest/oai/request
oai:docta.ucm.es:20.500.14352/1228412025-07-29T23:55:09Zcom_20.500.14352_14col_20.500.14352_15
Docta Complutense author Oyarzun Muñoz, Roberto author Lillo, Javier author Sánchez-Hernández, Juan Carlos author Higueras, Pablo 2025-07-29T08:12:10Z 2025-07-29T08:12:10Z 2005 Oyarzun, R. et al. (2005) «Pre-industrial metal anomalies in ice cores: A simplified reassessment of windborne soil dust contribution and volcanic activity during the last glaciation», International Geology Review, 47(11), pp. 1120-1130. Disponible en: https://doi.org/10.2747/0020-6814.47.11.1120. 0020-6814 10.2747/0020-6814.47.11.1120 https://hdl.handle.net/20.500.14352/122841 1938-2839 https://doi.org/10.2747/0020-6814.47.11.1120 https://www.tandfonline.com/journals/tigr20 A major issue regarding pre-industrial accumulation of heavy metals such as Cu, Pb, Zn, or Hg in ice cores relates to the source(s) of the metals. We investigate the two possibilities that have been generally advocated for the origin of metal anomalies: (1) increased amounts of windborne dust during particularly cold periods; and (2) volcanic activity. We analyze the time span 35,000–14,000 yrs BP, which is characterized by extreme temperature deviations (^T: –2.1º to –9.8ºC). Our findings show no definitive relationships between climate, dust, and metal contents, at least during the colder episodes. Thus, although dust deposition undoubtedly adds metals to the ice, it not clear whether climate can fully account for a direct relationship between these variables. In order to study the volcanic hypothesis, we analyze the case under a double perspective: (1) large explosive episodes related to acid magmatism; and (2) quieter mafic volcanic activity. Although the first one can introduce huge volumes of metal-rich aerosols to the stratosphere during single, catastrophic events, the latter is more continuous, accumulative, and far richer in sulfur. However, inasmuch as metals build volatile species with sulfur and halides, the chloride-rich character of the acid volcanism could easily compensate for its deficiency in sulfur. Thus, we suggest that the volcanic activity, via quiescent degassing and eruptive episodes, may account for an important part of the heavy metal contents present in the ice cores. eng Pre-industrial Metal Anomalies in Ice Cores: A Simplified Reassessment of Windborne Soil Dust Contribution and Volcanic Activity during the Last Glaciation journal article 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