Gunflint Range

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Shaded-relief image showing Duluth Complex arcing from Duluth to Pigeon Point, interrupting and splitting the Mesabi and Gunflint Ranges

The Gunflint Range is an iron ore deposit in northern Minnesota in the United States and Northwestern Ontario, Canada. The range extends from the extreme northern portion of Cook County, Minnesota into the Thunder Bay District, Ontario.

The Gunflint is a continuation of the Mesabi Range to the southwest. The two have been separated by the intrusion of the Duluth Gabbro complex. The iron deposit is a banded iron formation of the Early Proterozoic Animikie Group.[1][2] The cherts of the Gunflint (the Gunflint Chert) are noted for containing Precambrian microfossils.

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References[edit]

  1. ^ Mel'nik, Y. P. and D. B. Vitaliano Precambrian Banded Iron-formations: Physicochemical Conditions of Formation, Elsevier, 1982, p. 14 ISBN 978-0-444-41934-7
  2. ^ http://tin.er.usgs.gov/geology/state/sgmc-unit.php?unit=MNPReif%3B0 Animikie Group; Iron-formation, Minnesota geologic map data, USGS