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• W1609563358 abstract "We report Re-Os results on whole rock (WR) samples of chondrites and on metal-rich (i.e., highly magnetic) fractions (M) of chondrites from the H, L and LL groups. We also present data on WR and pure metal samples of Acapulco. These new results are compared with whole rock samples of iron meteorites [1,2] and of pallasites [3]. In earlier studies we showed that, using closed-system dissolution procedures [4-6], it was possible to obtain reproducible results of good quality on chondrites, in contrast to the wide scatter of data reported earlier [7,8]. We show that samples of H 3.8-6, L 4-6 and LL 3-6 chondrites all have the common Re-Os characteristic of lying along the IIA iron meteorite isochron. This behavior is also found for Acapulco. In discussing the data we will use the IIA isochron reported by Shen et al. [1] as a reference line. In previous reports, we showed that samples of St. Severin (LL6) exhibit a large range in Re/Os and that Os/Os was well correlated with Re/Os. This meteorite has abundant sulfide veins and pods and we interpreted the Re-Os data as an internal isochron resulting from major Re-Os fractionation and redistribution during melting of the FeNiS eutectic after assembling the St. Severin protolith. The St. Severin data give an age T = 4.68±0.15 AE and initial (Os/Os)0 = 0.0953±0.0013. This is in agreement with the more precise age found for the IIA irons [1,2]. There is substantially more scatter in the St. Severin data than in the data for iron meteorites (see Fig. 1). In contrast, whole rock and metal samples, for all other chondrites studied here, lie within a narrow region along the IIA isochron. As can be seen from the inset to Fig. 1, there are larger deviations in δM for the chondrite data from the reference line than for the iron meteorites. Some of this may reflect residual analytical problems or a more complex natural evolution for the chondrites. We investigated two other LL meteorites of lower metamorphic grade, Bishunpur (LL3) and Olivenza, (LL5). The two results on Olivenza WR are somewhat variable in Re/Os and lie near the reference line. The two metal results are in excellent agreement, lie much closer to the reference line and have much higher Re/Os than the WR. Bishunpur lies quite close to the line; however, only a WR was analyzed because of small sample size. An expanded, detailed view of chondrite data is given in Fig. 2. The H-chondrite metamorphic groups range from Dhajala (3.8) to Guarena (6). Dhajala WR2 is 16.7 ‰ off of the isochron and WR3 is on the isochron. Lost City WR is 10.2 ‰ off of the isochron while the more radiogenic metal is close to the isochron. The same behavior can be seen for Olmedilla WR and M as well as for Guarena and Ucera. The same scatter is seen for the L chondrites Floyd and Barwell with the M samples being more radiogenic than the WR. In summary, with the exception of St. Severin, the chondrite data for all classes show Re/Os to be quite restricted, with a spread along the reference isochron but with substantially more scatter and with the metal samples typically being more radio-" @default.
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• W1609563358 date "1998-03-01" @default.
• W1609563358 modified "2023-09-28" @default.
• W1609563358 title "Re-Os Systematics in Ordinary Chondrites and Acapulco" @default.
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