Antarctic polymict eucrite Yamato 792769 and the cratering record on the HED parent body

Details Antarctic polymict eucrite Yamato 792769 and the cratering record on the HED parent body Antarctic polymict eucrite Yamato 792769 and the cratering record on the HED parent body

May 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993gecoa..57.2111b&link_type=abstract

Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 57, no. 9, p. 2111-2121.

Other

1

Achondrites, Chronology, Cratering, Meteoritic Composition, Breccia, Mineralogy, Petrology, Radioactive Age Determination, Meteorites, Hed Meteorites, Parent Bodies, Antarctic Meteorites, Y792769, Yamato Meteorites, Cratering, Achondrites, Stony Meteorites, Description, Samples, Meteorite, Laboratory Studies, Age Dating, Microprobe Methods, Age, Electron Microscopy, Tem, Procedure, Mineralogy, Isotopic Ratios, Petrology, Matrix, Isochrons, Lithification, Comparison, Howardites, Eucrites, Diogenites

Scientific paper

Compared to most other Yamato polymict eucrites, Yamato Y792769 eucrite includes fewer and smaller eucritic clasts with homogenized pyroxenes, and its fine-grained matrix is shock-compacted and sintered. In this work, the relationships between the Antarctic eucrite Y792769, monomict eucrites, polymict eucrites, and isotopic ages are investigated, using results of Ar-39/Ar-40 method to date the time of the major thermal event on the Y792769 body and the Rb-Sr and Sm-Nd methods to determine whether relict older ages might have been preserved in some of the breccia materials. The Ar-39/Ar-40 time of the last thermal event which produced the Y792769 texture is 3.99 +/- 0.04 Ga. The complete resetting of the Ar-39/Ar-40 age is consistent with the texture of Y792769 observed in TEM, suggesting that shock compaction converted part of the matrix plagioclase to maskelynite. The Sm-Nd data give an age of 4.23 +/- 0.12 Ga, reflecting partial resetting of the Sm-Nd system during breccia formation. The 3.9 Ga Ar-39/Ar-40 age probably reflects a period of intense meteoroid bompardment which affected the entire inner solar system.

Affiliated with

Also associated with

No associations

Rating

Antarctic polymict eucrite Yamato 792769 and the cratering record on the HED parent body does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Antarctic polymict eucrite Yamato 792769 and the cratering record on the HED parent body, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Antarctic polymict eucrite Yamato 792769 and the cratering record on the HED parent body will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1853317