~(182)Hf-~(182)W age dating of a ~(26)Al-poor inclusion and implications for the origin of short-lived radioisotopes in the early solar system

Holst J.C.; Olsen M.B.; Paton C.Nagashima K.Schiller M.Wielandt D.Larsen K.K.Connelly J.N.J?rgensenc J.K.Krot A.N.Nordlund A.Bizzarro M.

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~(182)Hf-~(182)W age dating of a ~(26)Al-poor inclusion and implications for the origin of short-lived radioisotopes in the early solar system

机译：~(182)Hf-~(182)W age dating of a ~(26)Al-poor inclusion and implications for the origin of short-lived radioisotopes in the early solar system

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Refractory inclusions calcium-aluminum-rich inclusions, (CAIs) represent the oldest Solar System solids and provide information regarding the formation of the Sun and its protoplanetary disk. CAIs contain evidence of now extinct short-lived radioisotopes (e.g., ~(26)Al, ~(41)Ca, and ~(182)Hf) synthesized in one or multiple stars and added to the protosolar molecular cloud before or during its collapse. Understanding how and when short-lived radioisotopes were added to the Solar System is necessary to assess their validity as chronometers and constrain the birthplace of the Sun. Whereas most CAIs formed with the canonical abundance of ~(26)Al corresponding to ~(26)Al/~(27)Al of ? 5 × 10 ~(-5), rare CAIs with fractionation and unidentified nuclear isotope effects (FUN CAIs) record nucleosynthetic isotopic heterogeneity and ~(26)Al/~(27)Al of >5 × 10-6, possibly reflecting their formation before canonical CAIs. Thus, FUN CAIs may provide a unique window into the earliest Solar System, including the origin of short-lived radioisotopes. However, their chronology is unknown. Using the ~(182)Hf-~(182)W chronometer, we show that a FUN CAI recording a condensation origin from a solar gas formed coevally with canonical CAIs, but with 26Al/27Al of ?3 × 10~(-6). The decoupling between ~(182)Hf and 26Al requires distinct stellar origins: steady-state galactic stellar nucleosynthesis for ~(182)Hf and late-stage contamination of the protosolar molecular cloud by a massive star(s) for ~(26)Al. Admixing of stellar-derived ~(26)Al to the protoplanetary disk occurred during the epoch of CAI formation and, therefore, the ~(26)Al-~(26)Mg systematics of CAIs cannot be used to define their formation interval. In contrast, our results support 182Hf homogeneity and chronological significance of the ~(182)Hf-~(182)W clock.

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《Proceedings of the National Academy of Sciences of the United States of America》 |2013年第22期|8819-8823|共5页
作者
Holst J.C.; Olsen M.B.; Paton C.Nagashima K.Schiller M.Wielandt D.Larsen K.K.Connelly J.N.J?rgensenc J.K.Krot A.N.Nordlund A.Bizzarro M.;
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作者单位

Centre for Star and Planet Formation and Natural History Museum of Denmark, University of Copenhagen, DK-1350 Copenhagen, Denmark;

Hawaii Institute of Geophysics and Planetology, University of Hawaii at Manoa, Honolulu, HI 96822, United States;

Centre for Star and Planet Formation, Niels Bohr Institute, University of Copenhagen, DK-2100 Copenhagen, Denmark;

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收录信息美国《科学引文索引》(SCI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
原文格式 PDF
正文语种英语
中图分类自然科学总论;
关键词
Meteorite inclusions; Short-lived radionuclides; Solar system formation;

~(182)Hf-~(182)W age dating of a ~(26)Al-poor inclusion and implications for the origin of short-lived radioisotopes in the early solar system

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