Geochemical and Isotopic Variations in Paleoproterozoic BIF and BMF Deposits

Geochemical and Isotopic Variations in Paleoproterozoic BIF and BMF Deposits

Geochemical and Isotopic Variations in Paleoproterozoic BIF and BMF Deposits

A 207Pb/204Pb-206Pb/ 204Pb isochron of Trommald-Formation BIF samples corresponds to an age of 1597 +/- 120 Ma. A Pb-Pb isochron based on samples from the Ghanaian Birimian Successions banded-manganese-formation (BMF) produced an age of 2096 +/- 56 Ma. In both cases, these ages agree with other radiometric ages in these regions and hence appear to date actual geologic events. The Trommald Formation age records the alteration of the deposits during the post-Penokean & sim;1630 Ma Mazatzal Orogeny, whereas the 2096 +/- 56 Ma age records the depositional age for the Birimian BMF. 207Pb/204Pb- 206Pb/204Pb isochrons appear to be useful tools for dating BIF and BMF deposits.

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