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Characterization of Mason Gully (H5): The second recovered fall from the Desert Fireball Network

Dyl, Kathryn A. ; Benedix, Gretchen K. ; Bland, Phil A. ; Friedrich, Jon M. ; Spurný, Pavel ; Towner, Martin C. ; O' Keefe, Mary Claire ; Howard, Kieren ; Greenwood, Richard ; Macke, Robert J. ; Britt, Daniel T. ; Halfpenny, Angela ; Thostenson, James O. ; Rudolph, Rebecca A. ; Rivers, Mark L. ; Bevan, Alex W. R.

Meteoritics & Planetary Science, March 2016, Vol.51(3), pp.596-613 [Tạp chí có phản biện]

ISSN: 1086-9379 ; E-ISSN: 1945-5100 ; DOI: 10.1111/maps.12605

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  • Nhan đề:
    Characterization of Mason Gully (H5): The second recovered fall from the Desert Fireball Network
  • Tác giả: Dyl, Kathryn A. ; Benedix, Gretchen K. ; Bland, Phil A. ; Friedrich, Jon M. ; Spurný, Pavel ; Towner, Martin C. ; O' Keefe, Mary Claire ; Howard, Kieren ; Greenwood, Richard ; Macke, Robert J. ; Britt, Daniel T. ; Halfpenny, Angela ; Thostenson, James O. ; Rudolph, Rebecca A. ; Rivers, Mark L. ; Bevan, Alex W. R.
  • Chủ đề: Meteorites – Chemical Properties ; Petrography – Chemical Properties
  • Là 1 phần của: Meteoritics & Planetary Science, March 2016, Vol.51(3), pp.596-613
  • Mô tả: Mason Gully, the second meteorite recovered using the Desert Fireball Network (), is characterized using petrography, mineralogy, oxygen isotopes, bulk chemistry, and physical properties. Geochemical data are consistent with its classification as an H5 ordinary chondrite. Several properties distinguish it from most other H chondrites. Its 10.7% porosity is predominantly macroscopic, present as intergranular void spaces rather than microscopic cracks. Modal mineralogy (determined via ‐, element mapping via energy dispersive spectroscopy [], and X‐ray tomography [for sulfide, metal, and porosity volume fractions]) consistently gives an unusually low olivine/orthopyroxene ratio (0.67−0.76 for Mason Gully versus ~1.3 for typical H5 ordinary chondrites). Widespread “silicate darkening” is observed. In addition, it contains a bright green crystalline object at the surface of the recovered stone (diameter ≈ 1.5 mm), which has a tridymite core with minor α‐quartz and a rim of both low‐ and high‐Ca pyroxene. The mineralogy allows the calculation of the temperatures and ƒ(O) characterizing thermal metamorphism on the parent body using both the two‐pyroxene and the olivine‐chromite geo‐oxybarometers. These indicate that experienced a peak metamorphic temperature of ~900 °C and had a similar ƒ(O) to Kernouvé (H6) that was buffered by the reaction between olivine, metal, and pyroxene. There is no evidence for shock, consistent with the observed porosity structure. Thus, while Mason Gully has some unique properties, its geochemistry indicates a similar thermal evolution to other H chondrites. The presence of tridymite, while rare, is seen in other s and likely exogenous; however, the green object itself may result from metamorphism.
  • Số nhận dạng: ISSN: 1086-9379 ; E-ISSN: 1945-5100 ; DOI: 10.1111/maps.12605

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