Iron in Precambrian rocks - Implications for the global oxygen budget of the ancient earth

Details Iron in Precambrian rocks - Implications for the global oxygen budget of the ancient earth Iron in Precambrian rocks - Implications for the global oxygen budget of the ancient earth

Aug 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992gecoa..56.3217k&link_type=abstract

Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 56, no. 8, Aug. 1992, p. 3217-3223. Research supported by NSF.

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5

Geochemistry, Igneous Rocks, Iron, Manganese, Precambrian Period, Sedimentary Rocks, Atmospheric Chemistry, Mineralogy, Oxygen, Sandstones, Sediments, Shales

Scientific paper

An analysis of the chemical composition of Precambrian rocks is presented in order to examine the role of Fe in Precambrian geochemical cycles. The Fe content of igneous rocks is well correlated with their Ti content. Plots of Fe vs Ti in Precambrian sandstones and graywackes fall very close to the igneous rock trend. Plots of Fe vs Ti in Precambrian shales also follow this trend but exhibit a definite scatter toward an excess of Fe. Phanerozoic shales and sandstones lie essentially on the igneous rock trend and show surprisingly little scatter. Mn/Ti relations give a stronger indication of Precambrian Mn loss. These data show that Fe was neither substantially added to nor significantly redistributed in Archean and early Proterozoic sediments. Enough hydrothermal Fe was added to these sediments to increase the average Fe content of shales by at most a factor of 2. Continued redistribution of Fe and mixing with weathered igneous rocks during the recycling of Precambrian sediments account for the excellent correlation of Fe with Ti in Phanerozoic shales and for the similarity between their Fe/Ti ratio and that of igneous rocks.

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