Subject: Re: [meteorite-list] a question about chondrules
I'm reposting this as I received only one response. Please reply if you have any thoughts on this question. Thanks a lot in advance3.
ON THE ORIGIN OF CHONDRULES>> Meteorite-list mailing list
Norm and List,
Please excuse my ignorance for putting forth this question but as a relative "newbe" to meteorite collecting, I hope you will entitle me to this query.
I came across the term "accretionary lapilli" also called "volcanic pisolites" in Dorothy Ferris Lapidus 1987 edition of "The Facts on File Dictionary of Geology and Geophysics.
If you bear with me I'll quote " these are shperoidal concentrically layered pellets composed mainly of vitric dust and ash, usually between 2 and 10 mm in diameter. They are formed primarily through the accretion of ash and dust by condensed moisture in eruption clouds. Formless nuclei of coarse particles fall through the fine debris and acquire shells of progressively finer ash. These concentric shells indicate the increasiing temperature and decreasing humidity of the cloud at lower levels.
My question is, does the process described above provide any anology("something similar but different") to the origin of chondrules.
A solar nebula is obviously different than a volcano but is there any analagous sympatico to the spheroidal shape?
I've seen neither a macro nor micro view of a cross-section of a chondrule so I can't speak to the issue of concentric layering.
Please excuse this question if it either "offers a keen grasp of the obvious" or is so "out of the ballpark", "continent", "planet", "sun (star) system", "gallaxy" (that's as limiting as my current unaided memory allows my imagination to propel itself).
Thank you for your indulgence.
Jerry Flaherty
[email protected] http://six.pairlist.net/mailman/listinfo/meteorite-list
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