Geochemistry of Sedimentary Ore Deposits by J.B. Maynard

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 simplest examples for lots of chemical strategies are drawn from the research of ore deposits. hence, we initiated a path on the collage of Cincinnati entitled "Sedimentary Ore Deposits," which serves because the ultimate area direction for either our sedimentary petrology and our ore deposits series, and this booklet is predicated on that educating event. due to my orientation, the therapy given may be extra sedimentological than is generally present in books on ore deposits, yet i am hoping that this proves to be a bonus. it's going to even be seen that i've got drawn seriously at the principles and methods of Robert Garrels. a couple of humans have helped with the construction of this publication. i'm specifically thankful to my scholars and co-workers at Cincinnati and The Memorial college of Newfoundland for discomfort via initial types in my classes. I really thank invoice Jenks, Malcolm Annis, and Dave powerful. For aid 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 plenty of hours of insightful discussion.

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Example text

5 Chert-matrix differs from chert in having a uniformly very fine grain size. Only the chert mesobands show well-developed microbanding. Source: After Trendall and Blocldey 1970, table 4. 30 Chapter 2 Iron p. 106 and 257). Dimroth (1976, p. 204) has suggested that this microbanding is a diagenetic rather than a depositional feature, and, further, that these laminated IF types make up less of the section than the granular IF. The banded varieties, in fact, are overwhelmingly preponderant in most areas, and it seems unlikey that diagenetic processes could have preserved this delicate banding.

Grain sizes in granular IF have been reported by Mengel (1973) for deposits around Lake Superior. 5

Quartz with columnar impingement (common). Chalcedony-fibrous quartz, oriented normal to allochem boundaries (rare). Fringing chalcedony followed by iron-rich sparry calcite. Fringing ankerite or minnesotaite followed by quartz. 2 mm in long dimension found in matrix cherts. Composition is similar to matrix and so may be hard to distinguish. May have formed in place. Intraclasts--fragments of pre-existing sediment. In larger particles, internal sedimentary structures may be seen, but smaller varieties «4 mm) are more problematic.

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