Details

Autor(en) / Beteiligte

• Connelly, James N.
• Bizzarro, Martin
• Krot, Alexander N.
• Nordlund, Åke
• Wielandt, Daniel
• Ivanova, Marina A.

Titel

The Absolute Chronology and Thermal Processing of Solids in the Solar Protoplanetary Disk

Ist Teil von

• Science (American Association for the Advancement of Science), 2012-11, Vol.338 (6107), p.651-655

Ort / Verlag

United States: American Association for the Advancement of Science

Erscheinungsjahr

2012

Link zum Volltext

Quelle

American Association for the Advancement of Science

Beschreibungen/Notizen

• Transient heating events that formed calcium-aluminum-rich inclusions (CAIs) and chondrules are fundamental processes in the evolution of the solar protoplanetary disk, but their chronology is not understood. Using U-corrected Pb-Pb dating, we determined absolute ages of individual CAIs and chondrules from primitive meteorites. CAIs define a brief formation interval corresponding to an age of 4567.30 ± 0.16 million years (My), whereas chondrule ages range from 4567.32 ± 0.42 to 4564.71 ± 0.30 My. These data refute the long-held view of an age gap between CAIs and chondrules and, instead, indicate that chondrule formation started contemporaneously with CAIs and lasted ~3 My. This time scale is similar to disk lifetimes inferred from astronomical observations, suggesting that the formation of CAIs and chondrules reflects a process intrinsically linked to the secular evolution of accretionary disks.