Have We Seen Comet Wild 2 Samples Before?

Details Have We Seen Comet Wild 2 Samples Before? Have We Seen Comet Wild 2 Samples Before?

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufm.p51e1242z&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #P51E-1242

Physics

6015 Dust, 6040 Origin And Evolution, 6045 Physics And Chemistry Of Materials

Scientific paper

Considering the ferromagnesian mineral dominated Wild 2 particles captured by the Stardust Spacecraft, olivine and pyroxenes have the same range of Mg, Fe, Mn and Cr compositions as those in anhydrous chondritic interplanetary dust particles IDPs, and very similar to those in type 2 carbonaceous chondrites. In general, the type 3 carbonaceous chondrites and hydrous chondritic (IDPs) have narrower, or somewhat equilibrated olivine and pyroxene compositional ranges. With the exception of the one pentlandite grain encountered in our examination, the Fe-Ni sulfide compositions for the Wild 2 grains are similar only to the anhydrous chondritic IDPs. Hydrous IDPs, and all chondrites, contain significant amounts of pentlandite and low-Ni pentlandite. In addition, the absence of any aqueous alteration products in the Wild 2 grains (no phyllosilicates, indigenous carbonates, etc.) eliminates the hydrous chondritic materials from comparison. Thus, of known extraterrestrial materials, the anhydrous chondritic IDPs are most similar to the Wild 2 grains, although there are some intriguing differences. This is all as many expected, since a cometary origin has been suspected for these IDPs for many years [1]. It is clearly time to take a new look at the IDPs captured in Earth's stratosphere. The very wide range of olivine and low-Ca pyroxene compositions in Wild 2 require a wide range of formation conditions, including temperatures and fO2, probably reflecting very different locations in the protoplanetary disk. Acknowledgements: Regrettably, space does not permit us to list the names of all 57 members of the Stardust Mineralogy and Petrology Subteam of the Stardust Preliminary Examination Team, who collected the data used for this abstract and talk. Reference: [1] Nier and Schlutter, Meteoritics 25, 263-267 (1990.

Affiliated with

Also associated with

No associations

Rating

Have We Seen Comet Wild 2 Samples Before? 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 Have We Seen Comet Wild 2 Samples Before?, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Have We Seen Comet Wild 2 Samples Before? will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-962636