Lack of relationship between Al ages of chondrules and their mineralogical and chemical compositions |
| |
| Authors: | Johan Villeneuve Marc Chaussidon Guy Libourel |
| |
| Institution: | 1. CNRS, UPR 2300, Centre de recherches Pétrographiques et Géochimiques, Université de Nancy, 15, rue Notre-Dame-des-Pauvres, BP 20, 54501 Vandœuvre-lès-Nancy, France;2. ISTO, UMR 7327, Université d’Orléans, 45071 Orléans, France;3. CNRS/INSU, ISTO, UMR 7327, 45071 Orléans, France;4. BRGM, BP 36009, 45060 Orléans, France;5. École Nationale Supérieure de Géologie, Université de Nancy, rue du Doyen-Marcel-Roubault, BP 40, 54501 Vandœuvre-lès-Nancy, France |
| |
| Abstract: | Previous studies have suggested the existence of a correlation between 26Al relative crystallisation ages and mineralogical and bulk chemical compositions of ferromagnesian chondrules from the Bishunpur and Semarkona unequilibrated ordinary (0120 and 0150). However, because the precision in 26Al ages was moderate, these correlations are questionable. Here, we report mineralogical and chemical compositions of 14 ferromagnesian chondrules from Semarkona for which precise 26Al ages were previously obtained (Villeneuve et al., 2009). We find global correlation of 26Al ages neither with bulk chemical composition of chondrules, nor with the different types of ferromagnesian chondrules, i.e. PO, POP and PP. This indicates that if some kind of correlations between chemical compositions of chondrules and their ages of formation exists, they do not exist at timescales that can be measured with the 26Al-26Mg systematics but presumably at much shorter timescales. |
| |
| Keywords: | Unequilibrated ordinary chondrites Ferromagnesian chondrules 26Al relative ages Chemical compositions of chondrules Semarkona chondrite |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
