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• W2016921807 abstract "Young [1] has presented an ablative^diiusive model to reinterpret the K isotopic data of Humayun and Clayton [2], arriving at signi¢cantly diierent conclusions. Here, I show that Young's model [1] fails to explain the ubiquitous presence of volatile element depletion, and that his interpretations of the K isotopic data of [2] are achieved by replacing an intensive variable used by [2] with an extensive variable developed by [1] that traces mass loss but not volatile element depletion. Further discrepancies introduced by [1] also in£uence the outcome. It is shown here that the ablative^diiusive model of Young [1] has no cosmochemical applications. The intellectual foundations of K isotope cosmochemistry rest upon decades of work (summarized by [2^4]) by E. Anders, S.R. Taylor, H. Wa«nke, H. Palme, and others that showed that the chemical compositions of Earth, Moon and meteorites exhibit distinct volatile element depletion relative to Si, and refractory elements, when compared with CI chondrite compositions. These eiects are characterized by an increasing order of depletion with decreasing condensation temperature, such that the order of depletion in the Earth is La6 Si6K6Rb6Cs6Pb [3,4], and were recognized to be caused by processes such as partial evaporation or incomplete condensation, which had operated selectively on the basis of condensation temperature. Young [1] proposes an inherently non-selective process: evaporation so intense that both volatile elements and major elements are lost su¤ciently rapidly to constitute an ablative process, in which evaporative losses are restricted to a diiusively limited boundary layer on the exterior of the body experiencing the intense thermal event. The chemical composition of the body inwards of the boundary layer is identical to its initial chemical composition prior to the thermal event. However, the ablative nature of the process drives the boundary layer inwards at a rate, dr/dt, which (if not arrested by termination of the heating event) would eventually consume the entire object. The model developed by Young [1] has a characteristic non-dimensional number, the `ablative^ diiusive Peclet number' :" @default.
• W2016921807 created "2016-06-24" @default.
• W2016921807 creator A5085877860 @default.
• W2016921807 date "2001-09-30" @default.
• W2016921807 modified "2023-09-27" @default.
• W2016921807 title "Comment on “Assessing the implications of K isotope cosmochemistry for evaporation in the preplanetary solar nebula” by E. Young" @default.
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• W2016921807 doi "https://doi.org/10.1016/s0012-821x(01)00433-2" @default.
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