Iron-Formation Facts and Problems by A.F. Trendall, R.C. Morris

By A.F. Trendall, R.C. Morris

Elsevier compilation of scholarly articles pertaining to precambrian geology and iron formation - lightly used and formerly owned by means of a college.

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These textural phenomena are consistent with White’s (1954) earlier suggestion that the intercalated cherty (oxide-silicate facies) and slaty (silicate-carbonate facies) units in the Biwabik Iron Formation resulted from deposition near a transgressing and regressing strandline. They also are consistent with Goodwin’s (1956) suggestion that the same vertical facies arrangement in the Gunflint Iron Formation resulted from deposition at various water depths during periods of crustal instability, and that subsidence periodically modified the basin configuration and, in turn, the facies distribution.

As a consequence all of the iron ranges of the region were reevaluated during the period from 1946 t o about 1970, with emphasis on the sedimentological, diagenetic and metamorphic attributes of the various iron-formations. These studies led directly t o the development of facies concepts in iron-formations (James, 1954), t o several detailed sedimentological studies of specific iron-formations (White, 1954; Goodwin, 1956; Huber, 1959; James, 1966), t o the detailed chemistry of iron-formations (Lepp, 1963, 1966, 1968), and t o renewed interest in the origin of the iron-formations (Lepp and Goldich, 1964).

Y. (Van Schmus, 1980). , 1978). The volcanic rocks were intruded by a number of granitic rocks presumably during the later stages of the Penokean orogeny. y. y. y. y. in north-central Wisconsin (Sims and Peterman, 1980). Although the stratigraphic position of the volcanic-sedimentary sequence is equivocal relative t o the stratigraphic position of the rocks in the Animikie basin proper, all of the geochronometric data indicate that the two sequences are broadly correlative. _+ * * DOCUMENTATION OF THE BASIN Literally hundreds of papers have been written about various aspects of the Animikie basin and its contained iron-formations (Fig.

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