Unexpectedly ‘Young’ Chondrules Found in Meteorite

Paul H bristolia at yahoo.com
Sun Aug 21 23:32:05 EDT 2005

Monkey Wrench in Solar System Evolution
RedNova.com, August 18, 2005
http://www.rednova.com/news/space/212521/a_monkey_wrench_in_solar_system_evolution/index.html
http://www.rednova.com/news/space/213706/discovery_of_young_material_in_meterorites_defies_linear_theory_of/

"Toronto -- A U of T scientist has found unexpectedly
‘young’ material in meteorites – a discovery that
breaks open current theory on the earliest events
of the solar system."

Chondrules younger than thought
Science Daily (press release) - August 19, 2005
http://www.sciencedaily.com/upi/index.php?feed=Science&article=UPI-1-20050819-14253600-bc-canada-chondrules.xml

Discovery of ’young’ material in meterorites defies
linear ...
innovations report, Germany - August 19, 2005
http://www.innovations-report.de/html/berichte/geowissenschaften/bericht-48033.html

The paper dicussed in the above articles is:

Krot, A. N., Amelin, Y., Cassen, P., and Meibom, A.,
2005,
Young chondrules in CB chondrites from a giant impact
in the early Solar System. Science. vol. 436 No.
7053,
pp. 989-993.
http://www.nature.com/nature/journal/v436/n7053/abs/nature03830.html

Yours,

Paul

Review Paper on Chondrules Published in EPSL

Paul H bristolia at yahoo.com
Tue Aug 10 10:37:56 EDT 2004

Dear Friends,

the latest issue of Earth and Planetary Science
Letters
has a review article about chondrules. it is:

Zanda, B., 2004, Chondrules. Earth and Planetary
Science Letters. vol. 224, no 1-2 , Pages 1-17
(30 July 2004)

The abstract ends:

"The current most popular mechanisms for forming
chondrules in a nebular setting are radiation
emitted by the protosun in the X-wind setting
or shock waves propagated in the protoplanetary
disk. In the latter case, chondrule formation
may have contributed to the first stages of
accretion, which would have helped preserve the
chemical complementarity between chondrules and
matrix. It is important that the chemical and
isotopic properties, and even the petrology,
of chondrules be reassessed in order to allow
the development of chondrule formation models
that better fit these constraints."

Yours,

Paul
Baton Rouge, LA