Zr ISOTOPE SYSTEMATICS OF ALLENDE CAIs

Titanium Isotopes in CAIs - Heterogeneities in the early solar system

Calcium-rich-Aluminum-rich refractory inclusions are considered to be the first objects yet identified that formed in the solar system. It is now established that most (but not all) of them contain nucleosynthetic anomalies from e-, p-, r-, and/or s-processes. Exactly how and when these heterogeneities in the dust that formed the solar system were established is not yet clear. For a better unde...

Hf–W mineral isochron for Ca,Al-rich inclusions: Age of the solar system and the timing of core formation in planetesimals

Application of Hf–W chronometry to constrain the duration of early solar system processes requires the precise knowledge of the initial Hf and W isotope compositions of the solar system. To determine these values, we investigated the Hf–W isotopic systematics of bulk samples and mineral separates from several Ca,Al-rich inclusions (CAIs) from the CV3 chondrites Allende and NWA 2364. Most of the...

ZIRCONIUM AND CHROMIUM ISOTOPIC SYSTEMATICS OF NON - ALLENDE CAIs

SYNCHRONIZING 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...

Mg AND U ISOTOPIC SYSTEMATICS IN ALLENDE CAIs: IMPLICATIONS FOR THE ORIGIN OF URANIUM ISOTOPIC VARIATION IN REFRACTORY INCLUSIONS

Introduction: Calcium-aluminum–rich inclusions (CAIs) are considered to be the first formed solids in the Solar System [1]. Determining absolute ages of CAIs using long-lived radiochronometers such as PbPb, and relative ages using short-lived radiochronometers such as Al-Mg, is important for establishing the time sequence of early Solar System events. The long lived Pb-Pb chronometer has been u...