Correlation between relative ages inferred from26Al and bulk compositions of ferromagnesian chondrules in least equilibrated ordinary chondrites
نویسندگان
چکیده
منابع مشابه
Mg de cristallisation des chondres et leurs compositions minéralogiques et chimiques
Previous studies suggested the existence of a correlation between 26 Al relative crystallisation ages and mineralogical and bulk chemical compositions of ferromagnesian chondrules from the Bishunpur and Semarkona unequilibrated ordinary (Mostefaoui et al., 2002; Tachibana et al., 2003). However, because the precision in 26 Al ages was moderate, these correlations are questionable. Here, we repo...
متن کاملOxygen Isotopes of Al-rich Chondrules from Unequilibrated Ordinary Chondrites
Al-rich chondrules (ARCs) are a rare constituent of chondrites. They have relatively high bulk Al20 3 content(> 10 wt%), which is due to the presence of Al-rich phases, such as plagioclase, spinel, Al-rich glass etc. [1]. ARCs share some chemical and petrologic characteristics with Ca, Al-rich inclusions (CAis), and may represent a genetic link between ferromagnesian chondrules and CAis. Twelve...
متن کاملBULK OXYGEN-ISOTOPE COMPOSITIONS OF EQUILIBRATED ORDINARY CHONDRITE FALLS USING CO2 LASER-BrF5 FLUORINATION TECHNIQUE
We measured O-isotopic compositions of equilibrated ordinary chondrites (EOCs) using the CO 2 laser-BrF 5 fluorination technique at Korea Polar Research Institute. Fifty one EOC falls from UCLA collections were selected for this study. About 30-50 mg from each chondrite was gently crushed using agate mortar and pestle. About 2 mm-size fragment each was used to make polished thick sections. We o...
متن کاملBulk Compositions and Petrographic Characteristics of Ten Unusual Carbonaceous Chondrites
We used INAA to determine the bulk compositions of 10 carbonaceous chondrites of uncertain classification. Most samples were analyzed in duplicates and the averaged results are given in Table 1 and shown in Figs. 1 and 2. Thin sections were examined microscopically. Mgand Cr-normalized abundance patterns show clear identifications for four specimens (Fig. 1. The others have nonindicative elemen...
متن کاملIntermineral oxygen three-isotope systematics of silicate minerals in equilibrated ordinary chondrites.
High precision oxygen three-isotope ratios were measured for four mineral phases (olivine, low-Ca and high-Ca pyroxene, and plagioclase) in equilibrated ordinary chondrites (EOC) using a secondary ion mass spectrometer. Eleven EOCs were studied that cover all groups (H, L, LL) and petrologic types (4, 5, 6), including S1-S4 shock stages, as well as unbrecciated and brecciated meteorites. SIMS a...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Meteoritics & Planetary Science
سال: 2003
ISSN: 1086-9379,1945-5100
DOI: 10.1111/j.1945-5100.2003.tb00289.x