Calcium - Aluminum - Rich Inclusions Lead Isotopic Ages
نویسنده
چکیده
. clicking here colleagues, clients, or customers by , you can order high-quality copies for your If you wish to distribute this article to others . here following the guidelines can be obtained by Permission to republish or repurpose articles or portions of articles (this information is current as of September 10, 2010 ): The following resources related to this article are available online at www.sciencemag.org http://www.sciencemag.org/cgi/content/full/297/5587/1678 version of this article at: including high-resolution figures, can be found in the online Updated information and services, http://www.sciencemag.org/cgi/content/full/297/5587/1678/DC1 can be found at: Supporting Online Material found at: can be related to this article A list of selected additional articles on the Science Web sites http://www.sciencemag.org/cgi/content/full/297/5587/1678#related-content http://www.sciencemag.org/cgi/content/full/297/5587/1678#otherarticles , 5 of which can be accessed for free: cites 36 articles This article 292 article(s) on the ISI Web of Science. cited by This article has been http://www.sciencemag.org/cgi/content/full/297/5587/1678#otherarticles 26 articles hosted by HighWire Press; see: cited by This article has been http://www.sciencemag.org/cgi/collection/geochem_phys Geochemistry, Geophysics : subject collections This article appears in the following
منابع مشابه
Extreme 16 O Enrichment in Calcium - Aluminium - Rich Inclusions from the Isheyevo ( Ch / Cb )
Introduction: Calcium-aluminum-rich inclusions (CAIs) from the metal-rich (CH/CB-like) carbonaceous chondrite Ish-eyevo are mineralogically pristine and show no evidence for postcrystallization alteration [1]. Many of them are composed of very refractory minerals, such as hibonite (CaAl 12 O 19), grossite (CaAl 4 O 7), aluminum-rich pyroxene, and perovskite (CaTiO 3). We will present oxygen iso...
متن کاملSYNCHRONIZING THE ABSOLUTE AND RELATIVE CLOCKS: Pb-Pb AND Al-Mg SYSTEMATICS IN CAIs FROM THE ALLENDE AND NWA 2364 CV3 CHONDRITES
Introduction: In recent years, several high-resolution chronometers have been applied towards addressing the important question of the age of the Solar System, which is best estimated from the formation age of the calcium-aluminum-rich inclusions (CAIs), recognized as the earliest-formed solids in the solar nebula. However, there are inconsistencies in the ages of CAIs as determined by differen...
متن کاملCalcium-Aluminum-rich Inclusions: Major Unanswered Questions
Calcium-aluminum-rich inclusions (CAIs) preserve a record of events in the earliest solar system, the timing of these events and the conditions under which they occurred. Recent technical (analytical instrumentation) and theoretical advances have enabled researchers to extract an astonishing wealth of new information from CAIs, such as: (1) all CAIs may have formed in a restricted region or reg...
متن کاملOxygen isotope heterogeneities in the earliest protosolar gas recorded in a meteoritic calcium–aluminum-rich inclusion
Combined petrologic, oxygen and magnesium isotopic and trace element analyses of a compound calcium–aluminum-rich inclusion (CAI) from the Efremovka reduced CV3 carbonaceous chondrite reveal that it consists of a Mg-rich, O-rich xenolithic CAI, previously altered in the nebula, that impacted an extensively molten, O-depleted, type A host CAI shortly before the end of the host's crystallization....
متن کاملOxygen isotopes in calcium^aluminum-rich inclusions from enstatite chondrites: new evidence for a single CAI source in the solar nebula
Calcium^aluminum-rich inclusions (CAIs) from enstatite chondrites have large 16O excesses, similar to CAIs in carbonaceous and ordinary chondrites, and are also similar in morphology, mineralogy and Al^Mg isotopic systematics. These similarities provide new evidence that most CAIs might have formed in a single, restricted nebular locale and were then distributed unevenly throughout the various ...
متن کاملEvidence for supernova injection into the solar nebula and the decoupling of r-process nucleosynthesis.
The isotopic composition of our Solar System reflects the blending of materials derived from numerous past nucleosynthetic events, each characterized by a distinct isotopic signature. We show that the isotopic compositions of elements spanning a large mass range in the earliest formed solids in our Solar System, calcium-aluminum-rich inclusions (CAIs), are uniform, and yet distinct from the ave...
متن کامل