HIGH PRECISION Al-Mg ISOTOPE SYSTEMATICS FOR AN ALMOST PRISTINE REFRACTORY INCLUSION: IMPLICATIONS FOR THE ABSOLUTE AGE OF THE SOLAR SYSTEM
نویسندگان
چکیده
INCLUSION: IMPLICATIONS FOR THE ABSOLUTE AGE OF THE SOLAR SYSTEM. M. Wadhwa N. T. Kita, D. Nakashima, E. S. Bullock, G. J. MacPherson, and A. Bouvier, Center for Meteorite Studies, School of Earth and Space Exploration, Arizona State University, Tempe, AZ 85287 ([email protected]), WiscSIMS, Department of Geoscience, University of Wisconsin-Madison, Madison, WI 53706, Department of Mineral Sciences, National Museum of Natural History, Smithsonian Institution, Washington, DC 20560, Department of Earth Sciences, University of Western Ontario, London, ON, Canada N6A 5B7.
منابع مشابه
Internal Al–Mg isotope systematics of a Type B CAI: Remelting of refractory precursor solids
High precision SIMS Al–Mg isotope analyses were performed for a pristine Type B1 CAI Leoville 3535-1 on multiple mineral phases that include aluminum-rich zoned melilite mantle (Åk20–Åk60), magnesium-rich melilite (Åk70), fassaite, spinel and anorthite in the core. The data yield a well-defined internal isochron with an inferred initial Al/Al ratio of (5.002 ± 0.065) 10 , which is lower than th...
متن کاملEVIDENCE OF DISTURBANCE IN THE Al-Mg SYSTEMATICS OF THE EFREMOVKA E60 CAI: IMPLICATIONS FOR THE HIGH-RESOLUTION CHRONOLOGY OF THE EARLY SOLAR SYSTEM
Introduction: The high-resolution Al-Mg extinct chronometer (t1/2 = 0.72 Myr) has been applied extensively towards constraining the chronology of the early Solar System. In particular, there have been many investigations of the Al-Mg systematics in the calciumaluminum-rich inclusions (CAIs), which has been used to infer the age of the Solar System since these objects represent the earliest-form...
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 کاملBe-B ISOTOPE SYSTEMATICS IN CV AND CM HIBONITES: IMPLICATIONS FOR SOLAR ENERGETIC PARTICLE PRODUCTION OF SHORT-LIVED NUCLIDES IN EARLY SOLAR SYSTEM
Fossil records of the now-extinct short-lived nuclide Be have been found in early solar system objects that either host other short-lived nuclides, such as, Al and Ca, or are devoid of them [1-6]. The presence of Be in several Murchison hibonites devoid of detectable radiogenic Mg (initial Al/Al <2×10) and K (initial Ca/Ca <3×10) was considered as an indicator for separate sources for these nuc...
متن کاملRESOLVED TIME DIFFERENCE BETWEEN CALCIUM-ALUMINUM-RICH INCLUSIONS AND THEIR WARK LOVERING RIMS INFERRED FROM Al-Mg CHRONOLOGY OF TWO INCLUSIONS FROM A CV3 CARBONACEOUS CHONDRITE
Introduction: The refractory Calcium-Aluminumrich Inclusions (CAIs) preserve petrographic and geochemical records of the earliest events that shaped our Solar System. Absolute high-resolution Pb-Pb dating of CAIs has revealed them to be the oldest solids in the Solar System [1-4]. Another useful high-resolution relative dating technique is the Al-Mg short-lived chronometer which has been used e...
متن کامل