| Abstract |
We have analyzed Shisr 033, a CR chondrite from the Omani desert, using several different analytical techniques designed to Study the degree of terrestrial alteration of this meteorite and also its petrologic classification. Bulk chemical analyses (including organic carbon and mean total H2O content) are consistent with a CR classification. Additionally, oxygen isotope analysis on a bulk sample indicates that Shisr 033 is of type CR2. Amino acid analysis using liquid chromatography with UV fluorescence detection (HPLC-FD) and liquid chromatography-time of flight-mass spectrometry (LC-ToF-MS) show that the absolute and the relative amino acid content of Shisr 033 is distinct from other carbonaceous chondrites. Oxygen isotope analysis of a phyllosilicate-rich dark inclusion shows that this inclusion is closer to CV3 or CO3 chondrites. The effects of terrestrial weathering in Shisr 033 are evident from the dark inclusion carbon isotopic data, bulk chemistry (through the elevated concentrations of Sr and Ba), and amino acid data, which suggests extensive amino acid contamination of the meteorite from the fall site soil. Nevertheless, Shisr 033 contains a small fraction of indigenous components, as indicated by the presence of the extraterrestrial amino acid alpha-aminoisobutyric acid (AIB) that was not detected in the Shisr soils. Finally, the terrestrial age of Shisr 033 was determined and is discussed in the context of high levels of contamination. |
