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This finding could also be consistent with evidence from molecular biology that places the ancestry of primitive bacteria living in extreme thermal environments near the last common ancestor of all known life.

To make new advances in understanding the physical, chemical, and biological states of early environments for life through this unique Greenland record, we must fully exploit the spectrum of biosignatures available; these efforts must also be coupled with an understanding of the complex geologic history of the rocks hosting these signatures. H., Bridgwater, D., Dimroth, E., and Rosing, M., 1984, Stratigraphic and geochemical evidence for the depositional environment of the early Archaean Isua supracrustal belt, southern West Greenland: Precambrian Research, v.

But if other isotopes (U-Pb and Pb-Pb) are used, the apatites are estimated at just 1,504336 (2) and 1,459160 (2) Myr old.

This value is consistent with measurements of 1,600-1,700 Myr for Rb-Sr mineral isochrons on biotites from Amitsog gneiss in the region.

To see how we actually use this information to date rocks, consider the following: Usually, we know the amount, N, of an isotope present today, and the amount of a daughter element produced by decay, D*.Fractionated Fe isotopes with d 56 Fe values similar to those observed in Isua BIF have been reported from high-Si O 2 units of qap and used to support a chemical sedi-mentary protolith for the qap unit.Here, we present new Fe isotope data from all lithologic variants in the qap gneiss on Akilia, including layers of undisputed ultramafic igneous origin.Three apatite-associated graphites were found to contain curled graphite structures, identified by an anomalously intense second-order D-band (or 2D-band) Raman mode.These structures are similar to graphite whiskers or cones documented to form at high temperatures.

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