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• W2531857222 abstract "Madagascar chevrons are V-shaped, coastal dunes of disputed origin. Three distinct chevron complexes were sampled in this chapter: Fenambosy, Ampalaza, and Faux Cap. Chevrons contain abundant carbonate marine microfossils, some partially dolomitized, deposited over along-strike distances of 12 to >40 km. Marine microfossils in the dunes resemble filled-in marine foraminifers, differing from the hollow tests that dominate local beach deposits, and therefore arguing against modern beach deposits being the source of the chevrons' carbonate sands. Chevron dunes sampled in this study are typically not well sorted, with sediment surfaces that slope ≤10 degree. Both observations are inconsistent with an aeolian origin for the deposits. AMS 14C dating of three carbonate-rich sands yields ages between 13,835 ± 40 and 11,415 ± 35 years before present (year BP), significantly older than modern marine carbonate sediments aged 800 to 418 year BP (i.e., the marine reservoir correction). Assuming that the age range stipulated for carbonate sand represents the maximum plausible age of deposition of the chevrons also argues against a modern aeolian origin. Taken together, characteristics of the chevrons instead support the inference that they are megatsunami deposits possibly related to a Holocene landslide or bolide impact." @default.
• W2531857222 created "2016-10-21" @default.
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• W2531857222 date "2017-01-01" @default.
• W2531857222 modified "2023-09-29" @default.
• W2531857222 title "What Are the Origins of V-Shaped (Chevron) Dunes in Madagascar? The Case for Their Deposition by a Holocene Megatsunami" @default.
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• W2531857222 doi "https://doi.org/10.1016/b978-0-12-803386-9.00008-3" @default.
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