Universität zu Köln

1. Universität zu Köln Meteorites andthe early solar system. Dominik Hezel

3. D. C. Hezel: Meteorites and the early solar system General Remarks Meteorites allow precise determinations of processes in the inner solar nebula (< ~4 AU) during a time span of about 30 Ma. Reprocessing of presolar material (ISM), i.e. formation of the primitive material found in meteorites occurred during ~ 2 Ma. It is not known when this reprocessing occurred during protoplanetary disk evolution.

4. D. C. Hezel: Meteorites and the early solar system

5. 500 µm Chondrules = formerly small melt droplets Chondrule Ø: ~20 – 2 000 µm

6. D. C. Hezel: Meteorites and the early solar system Acfer 209

7. D. C. Hezel: Meteorites and the early solar system

8. D. C. Hezel: Meteorites and the early solar system av. solar system(Earth) low Al/Mg high Al/Mg Al-Mg decay system: 26Al →26Mg T1/2 = 0.74 Ma asteroidal melts asteroidal residues 40 0 20 60 -60 -40 -20 d26Mg* [ppm] after: Bizzarro et al. 2005; Baker & Bizzarro 2005

9. D. C. Hezel: Meteorites and the early solar system av. solar system(chondrites) metal-rich (low Hf/W) metal-poor (high Hf/W) Hf-W decay system: 182Hf →182W T1/2 = 9 Ma 2.9 eucrites Mars Earth iron meteorites 0.4 0 0.2 0.6 1.7 -0.4 -0.2 d182W* [ppm] data from: Kleine et al. 2002, 2005

10. condensend rim „Type II“ REE-pattern that can only be achieved during condensation. D. C. Hezel: Meteorites and the early solar system CAIs – Ca, Al-rich inclusions Ca, Al-rich phases condensed CAI (image: A. Pack)

11. Ni-map Image: Th. Schönbeck D. C. Hezel: Meteorites and the early solar system

12. D. C. Hezel: Meteorites and the early solar system Meibom et al. 1999

13. SiO2 • olivine Mg2[SiO4] Px • metal Fe93Ni7 Ol • pyroxene Mg2[Si2O6] • quartz SiO2 FeNi D. C. Hezel: Meteorites and the early solar system decreasing temperature Hezel et al. 2003

14. D. C. Hezel: Meteorites and the early solar system Fe-Ni-metal Enstatite – MgSiO3 Gehlenite Ca2Al2SiO7 Fraction CI chondritic composition condensed CorundumAl2O3 Hibonite CaAl12SiO19 Spl Forsterite – Mg2SiO4 Cpx Albite Anorthite Temperature (K) from: Davis & Richter 2005

15. D. C. Hezel: Meteorites and the early solar system Petaev & Wood 1998

16. D. C. Hezel: Meteorites and the early solar system Chondrule bulk compositions Hezel et al. 2006

17. D. C. Hezel: Meteorites and the early solar system porphyritic chondrule Barred olivine chondrule glass olivine olivine glass metal pyroxene ~1440°C ~1700°C

18. glass olivine Connolly et al. 1998 glass olivine D. C. Hezel: Meteorites and the early solar system

19. Desch & Connolly 2002 D. C. Hezel: Meteorites and the early solar system Chondrules formed by flash heating with peak temperatures >2000 K. The nature of the chondrule forming event is unknown, the recent favorite mechanisms are shock waves.

20. 150 µm image: Klerner 2001 D. C. Hezel: Meteorites and the early solar system Allende

21. forsterite (high Mg) solar Mg-, Si-composition enstatite (intermediate Mg) solar Mg/Si-ratio D. C. Hezel: Meteorites and the early solar system Chondrule-matrix complementarity requires a common reservoir for both components. Efremovka chondrules Hezel & Kießwetter in prep. matrix

22. D. C. Hezel: Meteorites and the early solar system age obtained from decay: 26Al →26Mg Bizzarro et al. 2004

23. D. C. Hezel: Meteorites and the early solar system schematic model of the formation of solid matter in the early solar system

24. Thank you foryour attention