Please use this identifier to cite or link to this item:
http://hdl.handle.net/11375/13165
Title: | Some Geochemical Aspects of Precambrian Iron Formation |
Authors: | Alcock, Fred G. |
Advisor: | Shaw, Denis M. |
Department: | Geology |
Keywords: | Geology;Geology |
Publication Date: | Sep-1971 |
Abstract: | <p>Spectrochemical analyses of rock samples of iron formation from the Archean of Ontario and Melville Peninsula reveal the generally low abundances of (1) the alkali metals (Li, Rb, Cs) in the whole rock; (2) the trace ferrides, Ga, Cu, Al and Mg in the magnetite fractions.</p> <p>In the oxide facies of iron formation there is a slight enrichment of Rb and a significant enrichment of Cs, with respect to K. Much of the Rb and Cs is trapped or adsorbed in the magnetite fraction. Lithium is concentrated in the silicate and clay fractions of the iron formation giving a positive correlation between Li and Al, reflecting the variation in physico-chemical conditions of deposition. Correlation of K/Na ratio with stratigraphic height agrees with the developMent of iron formation, in the Kirkland Lake area, as a late stage of an Archean volcanic cycle.</p> <p>The trace ferrides {Ti, V, Cr, Mn, Co, Ni} and Ga, Cu, Al and Mg are extremely depleted in the magnetite fraction, their ranges of abundances resembling those of volcanic-sedimentary iron deposits.</p> |
Description: | <p>[Missing pg 64]</p> |
URI: | http://hdl.handle.net/11375/13165 |
Identifier: | opendissertations/7990 9073 4422394 |
Appears in Collections: | Open Access Dissertations and Theses |
Files in This Item:
File | Size | Format | |
---|---|---|---|
fulltext.pdf | 3.2 MB | Adobe PDF | View/Open |
Items in MacSphere are protected by copyright, with all rights reserved, unless otherwise indicated.