147sm-143Nd and 87Rb-87Sr ages of the eucrite Piplia Kalan

Anil Kumar, ; Gopalan, K. ; Bhandari, N. (1999) 147sm-143Nd and 87Rb-87Sr ages of the eucrite Piplia Kalan Geochimica et Cosmochimica Acta, 63 (23-24). pp. 3997-4001. ISSN 0016-7037

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Official URL: http://linkinghub.elsevier.com/retrieve/pii/S00167...

Related URL: http://dx.doi.org/10.1016/S0016-7037(99)00172-6


Prompted by the finding that the eucrite Piplia Kalan could have retained Pu fission Xe earlier than the eucrites so far studied and hence be very ancient, we have measured a precise internal 147Sm-143Nd isochron for this meteorite. The age and initial Nd ratio relative to CHUR are 4.570 ± 0.023 Ga and -1.3 ± 0.7 ευ, respectively. A Rb-Sr whole rock (clast) isochron for this meteorite corresponds to an age of 3.963 ± 0.119 Ga and initial 87Sr/86Sr ratio of 0.69902 ± 3. But initial 87Sr/86Sr ratio calculated for an age of 4.57 Ga is 0.698956 ± 25, which is indistinguishable from 0.698970 ± 15 reported for the angrites LEW and ADOR dated at 4.5578 ± 0.0005 Ga. These results indicating that Piplia Kalan could have formed within only a few million years of the earliest condensates in the Solar System are strongly supported by the recent discovery of live 26Al in it.

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