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- W140965908 abstract "Introduction: In a recent study of xenon isotopes in size-separated nanodiamonds from the CV3 chondrite Efremovka (see [1]), it was shown that excesses of Xe from I decay are present in the P3 component [2]. Here we investigate the I-Xe system in nanodiamonds separates.. Systematics: In Fig. 1, we compare results of a simple model of the nanodiamond I-Xe system with literature data[3,4]. See also reference [2]. In our model, we assume that each meteorite parent body incorporated nanodiamonds from an initially homogeneous population. At some later time, the nanodiamonds were partially degassed of their Xe-P3 in a single event. During this event, such Xe as had already been produced by I decay was lost in the same proportion. To account for the data, this degassing must have taken place while I was still alive. After degassing, decay of the remaining I drove up the Xe/Xe ratio, the magnitude of the increase being higher for nanodiamonds that had been more degassed. It is noticeable that many nanodiamond separates are consistent with degassing at about the same time, albeit to different extents. For instance, Bishunpur (LL3.1) appears to have lost more of its xenon than Semarkona, but the data are consistent with synchronous closure. Nanodiamonds from the primitive ordinary chondrite ALH77307 [5] are clearly distinct. Other nanodiamond separates closed to xenon loss about 3 half lives of I (48 Ma) later. There is nothing inherently absurd about this conclusion – initial iodine ratios derived from isochrons from some chondrules from LL3 chondrites (and other meteorites) require similar late resetting (see Filtness et al., Gilmour et al., accompanying abstracts). In this respect, it is interesting that the “3 halflife” model line of Fig. 1 is close to the data from Colony (CO3), Mokoia (CV3), Tieschitz (H3.6), Renazzo (CR2), Vigarano (CV3) and Ragland (LL3.5), suggesting a similar response to a widespread decline in intensity of processing. Initial Iodine Ratio: Following on from our original work, we reported in abstract form the results of a con-" @default.
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- W140965908 date "2007-01-01" @default.
- W140965908 modified "2023-09-27" @default.
- W140965908 title "The I-Xe Record of Parent Body Processing in Meteoritic Nanodiamonds" @default.
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