Pb isotope geochemistry of the Fen carbonatite complex, S.E. Norway: Age and petrogenetic implications

Details Pb isotope geochemistry of the Fen carbonatite complex, S.E. Norway: Age and petrogenetic implications Pb isotope geochemistry of the Fen carbonatite complex, S.E. Norway: Age and petrogenetic implications

Jan 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988gecoa..52..209a&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 52, Issue 1, pp.209-215

Computer Science

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Scientific paper

Eighteen samples of carbonatites and associated silicate rocks from the Fen complex, southeast Norway, define a whole-rock Pb/Pb isochron (MSWD 3.63) with an age of 539 ± 14 Ma and a single-stage model value of 8.15. The samples show an extreme range of 206 Pb/ 204 Pb from 18.9 to 226, which correlates with the abundance of apatite in the rocks. The isochron plots above the Pb isotope growth curve for depleted mantle, but a composite of local crustal rocks has a composition which coincides with the Fen isochron. These features are interpreted as evidence of significant crustal contamination taking place during differentiation of carbonatite magma in the middle to shallow crust.

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