Other
Scientific paper
Jan 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998gecoa..62..159y&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 62, p. 159
Other
32
Chondrule, Transient Heating, Sodium, Silicates, Cooling, Isothermal Processes
Scientific paper
Flash heating is shown to be needed in order to keep Na in FeO-rich type II chondrules, and the cooling rates need to be much higher than those currently favored. On the other hand, Na loss from FeO-poor type I chondrules is much easier and is difficult to prevent efficiently even by flash heating. Flash experiments show that, although transient heating events can greatly reduce Na loss from chondrule analog compositions, other factors, such as cooling rate, ambient gas fO2, and chondrule compositions, also play important roles in determining the chondrule properties. In general, shorter heating time, higher cooling rate, higher fO2, and a relatively Si-rich and Mg-poor composition favor Na retention.
Hewins Roger H.
Yu Yang
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