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  • Lunar and Planetary Science and Exploration  (2)
  • Aluminium oxide; Calcium oxide; CLB-3; CLM-5; CLM-6; Event label; garnet; Iron oxide, FeO; Ma9330; Magnesium oxide; Manganese oxide; Phosphorus pentoxide; Position; Potassium oxide; ROCK; Rock sample; Scanning Electron Microscopy - Energy Dispersive Spectroscopy (SEM-EDS); Silicon dioxide; Sodium oxide; Sp9712; Sum; Titanium dioxide  (1)
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  • 1
    Publication Date: 2019-07-11
    Description: CB (Bencubbin-type) carbonaceous chondrites differ in many ways from more familiar CV and CO carbonaceous chondrites and from ordinary chondrites. CB chondrites are very rich in Fe-Ni metal (50-70 vol%) and contain magnesian silicates mainly as angular to sub-rounded clasts (or chondrules) with barred olivine (BO) or cryptocrystalline (CC) textures. Both metal and silicates appear to have formed by condensation. The sizes of silicate clasts vary greatly between the two subgroups of CB chondrites: large (up to one cm) in CB(sub a) chondrites, and typically to much much less than 1 mm in CB(sub b) chondrites. The compositional and mineralogical differences between these subgroups and between the CB(sub s) and other types of chondrites suggest different environment and possibly different timing of chondrule formation. In order to constrain the timing of chondrule forming processes in CB(sub s) and understand genetic relationship between their subgroups, we have determined Pb-isotopic ages of silicate material from the CB(sub a) chondrite Gujba and CB(sub b) chondrite Hammadah al Hamra 237 (HH237 hereafter).
    Keywords: Lunar and Planetary Science and Exploration
    Type: Lunar and Planetary Science XXXVI, Part 1; LPI-Contrib-1234-Pt-1
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  • 2
    Publication Date: 2019-07-13
    Description: The years since the Workshop on the Chronology of Meteorites and the Early Solar System, are marked with ongoing progress in cosmochronology. Rapid improvements in techniques, discovery of new meteorites unlike any previously known, and findings that what was deemed well established constants are actually variables, will be reflected in an updated review of the solar system chronology we are currently preparing. Along with updating the database of meteorite ages, it will involve development of a set of criteria for evaluation of accuracy and consistency of isotopic dates across the entire range of meteorite classes and isotope chronometer systems. Here we present some ideas on what we think is important in meteorite chronology, and invite the cosmochemistry community to discuss them.
    Keywords: Lunar and Planetary Science and Exploration
    Type: JSC-CN-25061 , First Solids in the Solar System; Nov 07, 2011 - Nov 09, 2011; Koloa, HI; United States
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  • 3
    Publication Date: 2023-04-24
    Keywords: Aluminium oxide; Calcium oxide; CLB-3; CLM-5; CLM-6; Event label; garnet; Iron oxide, FeO; Ma9330; Magnesium oxide; Manganese oxide; Phosphorus pentoxide; Position; Potassium oxide; ROCK; Rock sample; Scanning Electron Microscopy - Energy Dispersive Spectroscopy (SEM-EDS); Silicon dioxide; Sodium oxide; Sp9712; Sum; Titanium dioxide
    Type: Dataset
    Format: text/tab-separated-values, 216 data points
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