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- W2149546134 abstract "article i nfo Accretion of extraterrestrial material to earth is of interest for a variety of reasons, including as a possible driver of long or short-term climate change, and as a record of solar system events preserved in the geological record. 3 He is highly enriched in extraterrestrial material, and provides a useful tracer of its input into sedimentary archives. Previous work showed that polar ice could be a suitable archive for studying variations in extraterrestrial input. Additional measurements reported here confirm that the late Quaternary 3 He flux derived from Antarctic ice samples is similar to 3 He fluxes determined from marine sediments. The mean flux from nine replicate ∼1 kg ice samples from the Vostok ice core site (112-115 m depth, age of ∼3800 years) is 1.25±0.37×10 −12 cm 3 STP cm −2 ka −1 (mean±2se). The large range for the 9 replicates is probably due to the small number of interplanetary dust particles (IDPs) present, and illustrates that large ice samples are required for precise constraints on temporal variations in the 3 He flux. Size fraction experiments show that the majority of the 3 He flux is delivered by particles in the 5-10 μm size range, consistent with the hypothesis" @default.
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- W2149546134 date "2009-09-01" @default.
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- W2149546134 title "Flux and size fractionation of 3He in interplanetary dust from Antarctic ice core samples" @default.
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- W2149546134 doi "https://doi.org/10.1016/j.epsl.2009.07.024" @default.
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