chondrule sentence in Hindi
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- This supports the idea that CAIs crystallization and chondrule formation occurred around the same time during the formation of the solar system.
- The main characteristic of CI chondrites is the lack of recognizable chondrules ( an exception being the sample from Tagish Lake ).
- Saponite is also found in the " dark rims " of chondrules in carbonaceous chondrites and seen as a sign of aqueous alteration.
- Yet small chondrule fragments and calcium-aluminium-rich inclusions ( CAI's ) do occur, but are quite rare.
- The geological history of Benton has four stages : chondrule formation and accumulation, brecciation, thermal metamorphism and finally shock vein formation.
- Most chondrules are composed primarily of the silicate minerals olivine and pyroxene, surrounded by feldspathic material that may either be glassy or crystalline.
- The main arguments for this hypothesis are the relics of chondrules, the euhedral enstatites surrounded by meteoric iron and the occurrence of keilite.
- The variation of accretion efficiency with pebble size during this process results in the size sorting of the chondrules observed in the primitive meteorites.
- The growth of silicate particles is limited by the bouncing barrier to ~ 1 mm, roughly the size of the chondrules found in meteorites.
- Each chondrite group has a distinctive mixture of chondrules, refractory inclusions, matrix ( dust ), and other components and a characteristic grain size.
- These particles, or chondrules, are composed mostly of silicate minerals that appear to have been melted while they were free-floating objects in space.
- It seems likely that these chondrules cooled more slowly than those with radial or barred textures, however they still may have solidified in a matter of hours.
- Most chondrites contain both Type I and Type II chondrules mixed together, including those with both porphyritic and nonporphyritic textures, although there are exceptions to this.
- The tiny mass of asteroids may be partly due to inefficient chondrule formation beyond 2 AU, or less-efficient delivery of chondrules from near the protostar.
- The tiny mass of asteroids may be partly due to inefficient chondrule formation beyond 2 AU, or less-efficient delivery of chondrules from near the protostar.
- LL3, LL5, LL6 . ( Types range from 3 to 7 ) The number indicates the amount of alteration suffered by the chondrules in the meteorite.
- Less common types of chondrules may be dominantly composed of feldspathic material ( again either glassy or crystalline ), silica, or metallic Fe-Ni and sulfides.
- About 8 % of the meteorites that fall on Earth are achondrites ( meaning they do not contain chondrules ), some of which are similar to terrestrial igneous rocks.
- Other observed textural features that are clearly the result of very rapid cooling are dendritic and hopper-shaped olivine grains, and chondrules that are composed entirely of glass.
- An LL3 type is pristine with perfectly discernible chondrules, an LL7 type has been melted or altered by pressure or other force to almost completely obliterate the round chondrules.
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