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Science 13 November 1964:
Vol. 146. no. 3646, pp. 917 - 918
DOI: 10.1126/science.146.3646.917
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Articles

Graphitization of Organic Material in a Progressively Metamorphosed Precambrian Iron Formation

Bevan M. French 1

1 Department of Geology, Johns Hopkins University, Baltimore 18, Maryland

Organic matter in the sedimentary Biwabik iron formation in northern Minnesota shows a progressive increase in crystallinity where the formation is metamorphosed by the intrusive Duluth gabbro complex. X-ray diffraction of acid-insoluble residues shows that there is a complete range in crystallinity, from amorphous material in the unmetamorphosed sediments to completely crystalline graphite adjacent to the gabbro.


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Hydrocarbon occurrence and exploration in and around igneous rocks.
S. R. Schutter (2003)
Geological Society, London, Special Publications 214, 7-33
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Quartz and Magnetite: Oxygen-18-Oxygen-16 Fractionation in Metamorphosed Biwabik Iron Formation.
E. C. Perry, E. C. Perry Jr., and B. Bonnichsen (1966)
Science 153, 528-529
   Abstract »    PDF »
Carbonaceous Rocks of the Soudan Iron Formation (Early Precambrian).
P. E. Cloud, P. E. Cloud Jr., J. W. Gruner, and H. Hagen (1965)
Science 148, 1713-1716
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Science. ISSN 0036-8075 (print), 1095-9203 (online)