Paired Renazzo-type (CR) carbonaceous chondrites from the Sahara

Determination of the Specific Activities of the Cosmogenic Nuclides 10Be and 26Al in Meteorites from the Sahara by Means of Accelerator Mass Spectrometry

“…This Interpretation of the data is supported by results of mineralogical and petrographical investigations [18]. Remarkable about this pairing is the fact that the El Djouf location is more than 500 km apart from the Acfer location.…”

“…Table 3 contains the results of determinations via y-y-coincidence spectrometry of some ordinary chondrites from the Acfer region, which predominantly were performed for a comparison with results of AMS measurements. The Classification of the meteorites indicated in the tables was done by Bischoff et al [17], For some of the meteorites, exposure ages based on ^'Ne determinations [10,18,19] are available. These ages are included in the last column of Tables 1 and 2.…”

Noble gas record, collisional history, and pairing of CV, CO, CK, and other carbonaceous chondrites

“…The latter, however, is not always a reliable criterion as seen, for example, in the case of the CR chondrites Acfer 059 and El-Djouf. These two meteorites were found -500 km apart but all data are so similar that pairing must be assumed (Bischoff et al, 1993). Cook 003 and Maralinga were also collected 200 km apart.…”

NWA 1152 and Sahara 00182: New primitive carbonaceous chondrites with affinities to the CR and CV groups

“…The bulk carbon content measured was 0.16 wt% with a δ 13 C (PDB) composition of −16.06‰. (Bischoff et al 1993;Weisberg et al 1993;Kallemeyn et al 1994). c CRs (Ash and Pillinger 1995); CVs (Kerridge 1985 and references therein;Pearson 2003).…”

“…Rounded blebs of Fe-Ni metal are also distributed throughout the object. (Kallemeyn et al 1994), Acfer samples, El Djouf 001 (Bischoff et al 1993) and Allende (Simon et al 1995) for comparison. Olivine compositions in NWA 1152 are extremely MgO-rich and similar to other CR chondrite samples.…”