Physics
Scientific paper
Dec 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984jgr....8911581m&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 89, Dec. 10, 1984, p. 11581-11588.
Physics
14
Breccia, Chondrites, Impact Melts, Lunar Rocks, Mineralogy, Chemical Composition, Cooling, Olivine, Photomicrographs, Pyroxenes
Scientific paper
Lunar sample 77135, an impact melt breccia full of vesicles, has been reinvestigated by electron microprobe and X-ray diffraction techniques and compared with a vesicular melt LL chondrite, Yamato 790964, in an attempt to understand their impact heating processes and subsequent cooling history. Notable similarities between the lunar and chondritic melt breccias include: abundant vesicles, similar pyroxene chemical zoning trends, the presence of variable amounts of clastic material, and similar chemical compositions except for K and Na contents of glass and mesostasis. Some constraints on the cooling history are estimated from Mg-Fe diffusion profiles in olivine and pyroxene. The burial depth of lunar sample 77135 during cooling was 0.2-100 m; the depth for the chondrite was probably smaller. Impact melts were probably produced and a layer of regolith retained on the parent body sufficiently thick to allow the olivines to homogenize during slow cooling.
Ishii Takaaki
Miyamoto Manabu
Takeda Hidenori
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