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- W4367397478 abstract "This work presents data on charcoal fragments found in Cenozoic deposits of the Boa Vista Formation and the first absolute dating for this unit. The methodology consisted of the definition of sedimentary facies, as well as the establishment of depositional age using optically stimulated luminescence (OSL) in quartz grains. Analysis was carried on charcoal samples with the help of Scanning Electron Microscopy (SEM), AMS 14C dating, and organic petrography. The facies analysis identified four distinct facies: lateritic massive gravel facies (Gcm1), ferruginous massive gravel facies (Gcm2), massive sand facies (Sm) and fossiliferous massive sand (Smf). The ages of the deposits ranged between 105,2 and 3,2 thousand years before present, indicating that this unit is positioned in the Upper Pleistocene-Upper Holocene transition. The anatomical structures observed in SEM are well preserved and the studied charcoal samples have angiospermic affinity. Two episodes of fires were identified with range ages between 5663 and 3377 cal years BP, with burning temperature varying from 340 °C to 400 °C." @default.
- W4367397478 created "2023-04-30" @default.
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- W4367397478 date "2023-07-01" @default.
- W4367397478 modified "2023-10-03" @default.
- W4367397478 title "OSL and radiocarbon dating and evidence of palaeo-wildfires in Quaternary deposits of the Tacutu basin, northwestern Brazil" @default.
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- W4367397478 doi "https://doi.org/10.1016/j.jsames.2023.104377" @default.
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