Other
Scientific paper
Dec 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996gecoa..60.4889w&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 60, Issue 23, pp.4889-4893
Other
9
Scientific paper
The long-lived 147 Sm---143Nd chronometer has been used in conjunction with the short-lived 146 Sm--- 142 Nd and 53 Mn--- 53 Cr chronometers to constrain the time of formation for the eucrite Caldera. The combination of these three chronometers has produced results that are consistent with one another and converge on a precise, high resolution age of 4537 ± 12 Ma (within 95% confidence limits). So far this is the youngest crystallization age that has been confirmed for a noncumulate eucrite. Thus, this basaltic meteorite formed relatively late as compared to other noncumulate eucrites on a differentiated asteroidal parent body, most likely between 17 and 41 million years after the formation of the first condensates in the early Solar System. From these age constraints it is evident that Caldera either formed within a magma body on a large (>500 km) asteroid or in an extensive impact melt on the crust of its parent body.
Lugmair Günter W.
Wadhwa Meenakshi
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