Arcuate band texture in a dark inclusion from the Vigarano CV3 chondrite: Possible evidence for early sedimentary processes

Details Arcuate band texture in a dark inclusion from the Vigarano CV3 chondrite: Possible evidence for early sedimentary processes Arcuate band texture in a dark inclusion from the Vigarano CV3 chondrite: Possible evidence for early sedimentary processes

May 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998m%26ps...33..519t&link_type=abstract

Meteoritics & Planetary Science, vol. 33, no. 2, pages 519-525.

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Scientific paper

A dark inclusion in the Vigarano CV3 carbonaceous chondrite consists almost exclusively of small (<5 microns in diameter) grains of Fe-rich olivine, and is devoid of chondrules, Ca-Al-rich inclusions and their pseudomorphs. In back-scattered electron images, this dark inclusion shows an unusual texture comprising a network of arcuate bands. Two or more bands occur roughly parallel, forming a set of succesive parallel bands, some crosscutting one another. The bands contain slightly higher amounts of relatively small (<1 microns) olivine grains and so are more densely packed than other areas. The olivine grains in the bands are slightly more Fe-rich than those in other areas. The bands commonly show gradation on the concave side due to a decrease in the abundance of the small Fe-rich olivine grains. Texturally, the arcuate bands closely resemble `dish structures' that are commonly observed in siltstones and sandstones on Earth. Dish structures are characterized by thin, dark-colored, subhorizontal to concave- upward laminations which are rich in relatively fine- grained material. On Earth, dish structures form during compaction and dewatering of unconsolidated fine-grained sediments and they are one of the characteristic sedimentary structures formed through fluidization of fine grains. The dark inclusion in Vigarano, therefore, provides the first evidence that sedimentary processes due to water migration may have taken place within planetesimals, and further suggests that fluidization may have played a significant role in the formation of the carbonaceous chondrites.

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