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French BM. Graphitization of Organic Material in a Progressively Metamorphosed Precambrian Iron Formation. Science. 1964;146(3646):917-8doi: 10.1126/science.146.3646.917.
French, B. M. (1964). Graphitization of Organic Material in a Progressively Metamorphosed Precambrian Iron Formation. Science (New York, N.Y.), 146(3646), 917-8. https://doi.org/10.1126/science.146.3646.917
French, B M. "Graphitization of Organic Material in a Progressively Metamorphosed Precambrian Iron Formation." Science (New York, N.Y.) vol. 146,3646 (1964): 917-8. doi: https://doi.org/10.1126/science.146.3646.917
French BM. Graphitization of Organic Material in a Progressively Metamorphosed Precambrian Iron Formation. Science. 1964 Nov 13;146(3646):917-8. doi: 10.1126/science.146.3646.917. PMID: 17777057.
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Science. 1964 Nov 13;146(3646):917-8. doi: 10.1126/science.146.3646.917.

Graphitization of Organic Material in a Progressively Metamorphosed Precambrian Iron Formation.

Science (New York, N.Y.)

B M French

PMID: 17777057 DOI: 10.1126/science.146.3646.917

Abstract

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.

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