Download Iron-Formation Facts and Problems by A.F. Trendall, R.C. Morris PDF
By A.F. Trendall, R.C. Morris
Elsevier compilation of scholarly articles bearing on precambrian geology and iron formation - lightly used and formerly owned by means of a college.
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Extra resources for Iron-Formation Facts and Problems
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.
The algal-bearing beds appear t o pinch out t o the south, and either thick-bedded or thin-bedded iron-formation may make up the entire Trommald Formation at a given locality. However, the Trommald Formation in the main part of the Cuyuna range appears to consist of a thin-bedded unit overlain by the thick-bedded unit (Schmidt, 1963). The thick-bedded unit also pinches out t o the south, and the Trommald Formation in the southern part of the Cuyuna range appears to consist entirely of thin-bedded iron-formation (Harder and Johnston, 1918; Marsden, 1972).
The thick-bedded facies consists partly of evenly bedded iron-formation separated by beds of chert that range in thickness from several centimeters t o several meters, and partly of wavy-bedded rock in which chert 47 and iron minerals alternately dominate in layers. The thick-bedded units typically are granule-bearing and locally are oolitic. The granules consist of various mixtures of magnetite, chert, and iron silicates, whereas the oolites consist of hematite and chert; locally the oolites have cores of clastic quartz.