TRACE ELEMENT ABUNDANCES IN WARK- LOVERING RIMS OF CAIs FROM A CV3 METEORITE: IMPLICATIONS FOR THEIR CHRONOLOGY
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چکیده
منابع مشابه
RESOLVED 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...
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Introduction: Wark-Lovering rims (WLR) consist of a sequence of mono-mineral layers a few microme-ters thick (hibonite, perovskite, spinel, melilite, anor-thite, pyroxene, olivine) surrounding most coarse-grained Ca-Al-rich inclusions (CAIs) [1]. Despite numerous studies, their formation is still not well understood. Based on their mineralogy [1], their rare earth element (REE) content [2] or t...
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Introduction: Ca-, Al-rich inclusions (CAIs) from CV chondrites commonly show oxygen isotope heterogeneity among different mineral phases within individual inclusions reflecting the complex history of CAIs in both the solar nebula and/or parent bodies [1]. The degree of isotopic exchange is typically mineralspecific, yielding O-rich spinel, hibonite and pyroxene and O-depleted melilite and anor...
متن کاملA Compact Type a Inclusion with Multiple Wark-lovering Rims: a Complex History Recorded in Pyroxene
Introduction. The Wark-Lovering rims [1] found on many refractory inclusions are important recorders of nebular environments to which refractory inclusions were exposed after their formation, such as different temperature regimes and isotopic reservoirs [2]. As part of a large-scale survey of W-L rims to enable us to better understand the range of environments reflected in rims, an inclusion of...
متن کاملComment on “Valence state of titanium in the Wark–Lovering rim of a Leoville CAI as a record of progressive oxidation in the early Solar Nebula― by K.A. Dyl, J.I. Simon and E.D. Young
Dyl et al. (2011) state that their results confirm the conclusion of J. Simon et al. (2005) that the pyroxene in Wark–Lovering rims (Wark and Lovering, 1977) found on Ca-, Al-rich refractory inclusions has lower Ti/Ti ratios than the primary pyroxene in the interiors of inclusions. While true, the claim is misleading because J. Simon et al. (2005) concluded that there was no Ti in the rims, whe...
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