Nedagolla, a remelted iron meteorite

Details Nedagolla, a remelted iron meteorite Nedagolla, a remelted iron meteorite

May 1974

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974gecoa..38..747m&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 38, Issue 5, pp.747-748

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Scientific paper

The Nedagolla meteorite was recognized by Axon to be a rare example of an iron which has been preterrestrially reheated to the point of melting. The dendrite secondary arms are spaced 200 m apart, implying that Nedagolla solidified and cooled at ~0·02°C/sec. The presence of ( Fe , Cr ) 1- x S inclusions precipitated during cooling in the interdendritic regions and evidence of solute redistribution of Ni, Cr, Co, Si and P are consistent with this cooling rate. Such a rate indicates that Nedagolla cooled very near the surface of its parent `body'. Secondary microstructural features including the presence of isothermal taenite and minute phosphide precipitates, which have formed from the dissolution of primary phosphide material, indicate a later reheating to about 750°C for a period of several hours.

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