PRISTINE CHONDRITES DOM 08004 and DOM 08006 : GROSSITE - RICH CO 3 . 0 s OR RELATIVES OF ACFER 094 ?
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Al-mg Dating of Ca-al-rich Inclusions in Acfer 094 Chondrite
Introduction: Acfer 094 is one of the most primitive chondrites, which appears to have escaped thermal metamorphism above 300°C [1] and can potentially provide important clues to primary, undisturbed by parent body processes, abundances of short-lived ra-dionuclides in its components. Krot et al. [2] have recently described mineralogy and petrography of the Al-rich chondrules and refractory inc...
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Introduction: The Mighei-like carbonaceous (CM) chondrites are one of the most abundant and aqueously altered group of carbonaceous chondrites [1–4]. The organic molecules present and the effects of aqueous alteration have been extensively studied in the CM chondrites [e.g., 1,3,5]. As many CM chondrites are extensively aqueously altered, the compositions and formation histories of their anhydr...
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Introduction: Fine-grained matrix is a major (and thermally the most primitive) component in chondrites. Analyses of chondrite matrix [1] reveal that it does not have a primordial CI-like composition, showing instead a consistent depletion compared to solar in all chondrite groups (except CI). This suggests that volatile depletion was an early event, possibly involving cooling of a hot inner di...
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We used the electron microprobe to study matrix in the ungrouped type 3.0 carbonaceous chondrite Acfer 094 using 7 · 7-point, focused-beam arrays; data points attributable to mineral clasts were discarded. The grid areas show resolvable differences in composition, but differences are less pronounced than we observed in studies of CR2 LaPaz Icefield (LAP) 02342 (Wasson and Rubin [2009]) and CO3....
متن کاملKUSHIROITE, CaAl2SiO6, A NEW MINERAL IN CARBONACEOUS CHONDRITES: ITS FORMATION CONDITIONS AND GENETIC SIGNIFICANCE IN Ca-Al- RICH REFRACTORY INCLUSIONS
Introduction: Ca-Tschermak (hereafter CaTs), CaAl 2 SiO 6 , component has been one of the most important hypothetical members of pyroxene, and CaTs-rich pyroxene was abundantly reported from refractory inclusions in carbonaceous chondrites [e.g., 1]. However, the nature of such pyroxene has not been characterized in detail because of their tiny grain size. For the first time, we succeeded to id...
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تاریخ انتشار 2014