U-Pb ages of angrites
نویسندگان
چکیده
The chemistry and isotope chemistry of natural materials is highly indicative of provenance and process throughout geological history. Our studies range in time from the earliest solar system through to processes that are actively taking place today, and in scope from planetary systems to individual molecules. Active areas of research centre on planetary studies, metamorphic and igneous geochemistry and geochronology, geochemistry of life processes, and chronology of all processes encompassed.
منابع مشابه
Hf-w Chronology of the Angrite Parent Body: Timing of Accretion, Core Formation and Magmatism
Introduction: Key issues regarding the early evolution of planetesimals include the timescales of accretion, core formation, and magmatism. The short-lived Hf-W system has proven particularly useful as a chronometer for these early planetary processes. For instance, W model ages for magmatic iron meteorites reveal that core formation in their parent bodies occurred within ~1 Myr after formation...
متن کاملLead-lead Constraints on the Time Scale of Early Planetary Differentiation
Introduction: The U-Pb isotope system provides unparalleled chronological resolution in the determination of absolute ages of events occurring in early solar system history. Proper comparison of these absolute ages with the relative chronologies emerging from studies of now-extinct nuclides such as Al, Mn, and Hf requires identification of fixed time points in the evolution of materials in the ...
متن کاملPlutonium-Xenon systematics of Angrites
Introduction: Angrites are igneous meteorites that crystallized very early in the solar system, ~10 Ma after CAIs, as also implied by the presence of now extinct short-lived radionuclides such as Mn, Sm and Pu [1]. Fission Xe was used to calculate Pu-Xeretention ages of eucrites, relative to that of Angra dos Reis (AdoR) [2]. AdoR has an absolute Pb-Pb age of 4557.8 Ma [see 1 for ref.]. Most eu...
متن کاملUranium isotope compositions of the basaltic angrite meteorites and the chronological implications for the early Solar System.
Events occurring within the first 10 million years of the Solar System's approximately 4.5 billion-year history, such as formation of the first solids, accretion, and differentiation of protoplanetary bodies, have determined the evolutionary course of our Solar System and the planetary bodies within it. The application of high-resolution chronometers based on short-lived radionuclides is critic...
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U-Th zircon SHRIMP and U-Th-total Pb monazite CHIME ages of 6 typical samples were established among different rock types outcropped into the Chah-Dozdan batholith from Iran. The zircon population displays simple internal structures in samples of the Chah-Dozdan batholith. The zircon crystals have well-preserved magmatic characteristics. In all population, the rims display younger ages than the...
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