By J.B. Maynard
This ebook is an outgrowth of my curiosity within the chemistry of sedimentary rocks. In educating geochemistry, i noticed that the easiest examples for lots of chemical procedures are drawn from the examine of ore deposits. for that reason, we initiated a path on the college of Cincinnati entitled "Sedimentary Ore Deposits," which serves because the ultimate sector direction for either our sedimentary petrology and our ore deposits series, and this publication is predicated on that educating adventure. as a result of my orientation, the therapy given may be extra sedimentological than is generally present in books on ore deposits, yet i'm hoping that this proves to be a bonus. it's going to even be noticeable that i've got drawn seriously at the principles and methods of Robert Garrels. a couple of humans have helped with the production of this publication. i'm specifically thankful to my scholars and associates at Cincinnati and The Memorial college of Newfoundland for pain via initial types in my classes. I relatively thank invoice Jenks, Malcolm Annis, and Dave robust. For support with box paintings I thank A. Hallam, R. Hiscott, J. Hudson, R. Kepferle, P. O'Kita, A. Robertson, C. Stone, and R. Stevens. i'm additionally deeply indebted to Bob Stevens for lots of hours of insightful discussion.
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Extra info for Geochemistry of Sedimentary Ore Deposits
Chemical analyses have been presented by Ewers and Morris (1981), and Gole (1981) has described similar textures from Archean age IF. Unlike the Sokoman IF of the Labrador trough, which Chauvel and Dimroth (1974) studied, the Hamersley rocks are almost entirely of the banded type. There are three scales of banding. 6 m. The shale macrobands differ from what are commonly thought of as shales in containing less detrital material and more iron minerals. oat. Laminations, where found, are defined by layers of pyrite or carbonaceous material.
Oxide - - - - - -... Carbonate - - - - - -.. ====e::==='°::irU•• Basin Fig. 2-9. Facies relations in the Algoma-type Michipicoten IF of Ontario according to Goodwin (l973a, fig. 2). es Island Arc ] o N LEGEND [[(J] Grevwlcke . • rgtlllt. h . . Granodlo"te ~ Gabbro . noute . J Dle'Ie , thyollt. e Approx . format ton Fig. 2-10. Reconstruction of the depositional environment of Algoma-type IF (Goodwin 1973b, fig. 9). The setting is similar to that for Kuroko-type and other volcanicsedimentary ores of felsic association.
In fact, Fig. 2-6 shows that greenalite most likely was not present as such, but as an amorphous precursor of the same composition. 10IO(OH)8' in accordance with the findings of Gole (1980) that this is the earliest silicate phase. The most likely primary assemblage was, then, amorphous greenalite, Fe(OH)3' crystalline FeC03 and amorphous silica, possibly with an amorphous precursor of magnetite. During diagenesis these crystallized to greenalite, hematite, magnetite and chert, with stilpnomelane forming by reaction of one of the Fe-bearing phases with chert.
Geochemistry of Sedimentary Ore Deposits by J.B. Maynard