Some Peculiarities of H-Chondrite Parent Body Evolution

Details Some Peculiarities of H-Chondrite Parent Body Evolution Some Peculiarities of H-Chondrite Parent Body Evolution

Nov 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001sosyr..35..458a&link_type=abstract

Solar System Research, v. 35, Issue 6, p. 458-468 (2001).

Mathematics

Logic

1

Scientific paper

Cosmic-ray exposure ages and gas-retention ages have been calculated for more than 1000 ordinary chondrites. The distributions of meteorites according to ages, local times of fall, and fragment numbers and shapes have been analyzed. The H5-chondrites have been found to differ from H3-, H4-, and H6-chondrites in a number of characteristics: the H5-chondrites lose both cosmogenic and radiogenic gases much more readily; on falling to Earth, H5-chondrites break up into a greater number of fragments, and the parameters that characterize the shape of H5-chondrites (the b/aand c/aratios) likewise appear to differ from the corresponding parameters of H-chondrites of other petrologic types. These features of H5-chondrites are difficult to attribute to their small-perihelion orbits, greater preatmospheric mass, or higher velocity of atmospheric entry. In addition to this, a higher proportion of morning falls is observed among H5-chondrites, especially among meteorites formed in the large-scale event that occurred ~7 Myr ago. It is assumed that these distinctive features of H5-chondrites may be due to changes caused in the physical properties (dispersity of mineral components, fracture system, etc.) of the material of the petrologic type 5 of the H-chondrite parent body by the shock effect during megabreccia formation or at a later time. Part of the H5-chondrites segregated from the parent body ~7 Myr ago could have been injected deeply into ν_6or 3 : 1 resonances, which could have increased the proportion of H5-chondrite morning falls, especially among meteorites with cosmic-ray exposure ages of 4-10 Myr.

Affiliated with

Also associated with

No associations

Rating

Some Peculiarities of H-Chondrite Parent Body Evolution 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 Some Peculiarities of H-Chondrite Parent Body Evolution, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Some Peculiarities of H-Chondrite Parent Body Evolution will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1566956