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Origin of the Zinc and Lead Deposits of the Joplin Region

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Excerpt from Origin of the Zinc and Lead Deposits of the Joplin Region: Missouri, Kansas, and OklahomaThe author Of the present r... Weiterlesen
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Excerpt from Origin of the Zinc and Lead Deposits of the Joplin Region: Missouri, Kansas, and Oklahoma

The author Of the present report has been studying the zinc and lead deposits Of the Joplin region for the last 12 years, although his work has not lain continuously in that field. His knowledge Of these deposits is consequently both intimate and extensive. It is usual in presenting the results Of an investigation to publish with the con clusions all the facts upon which the conclusions rest. Mr. Siebenthal has not followed this plan. Having reached definite decisions on the question Of how the ores were deposited, he has deemed it best to put these decisions and the significant facts on which they are based in form for immediate publication. A full presentation Of his evidence will require an account Of the general geology Of the region, with detailed descriptions Of local tracts and individual mines. The prep aration Of this descriptive material, which must necessarily include many maps and illustrations, will require considerable time and some additional field work. The data will be published as a volume supplementary to the present report.

The lead and zinc deposits Of the Mississippi Valley are not only Of great economic importance, but have long been intensely interesting to students Of ore deposits. They constitute a conspicuous example Of the occurrence Of sulphide ores in a region where, so far as can be determined, plutonic or volcanic activities can have had no part in their genesis.

Naturally the Joplin deposits have been much studied, and Mr. Siebenthal, on pages 39 - 41 Of the present bulletin, has summarized the views Of his predecessors, among whom have been some very able workers in economic geology. As he shows, there is not an important formation in the region that has not, at one time or another, been regarded as a source Of ore constituents. Under these circumstances it was scarcely to be expected that he would add to the number Of more or less reasonable hypotheses that had already been suggested or developed in explanation Of the origin of these ores. His particular opportunity was that Of testing these hypotheses by careful considera tion Of a larger body Of facts than was available to earlier workers, Of discovering new evidence in these facts, and, by processes Of elimina tion, selection, and combination, Of building up a consistent theory of genesis for the ore deposits Of the Joplin type.

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Titel: Origin of the Zinc and Lead Deposits of the Joplin Region
Untertitel: Missouri, Kansas, and Oklahoma (Classic Reprint)
EAN: 9780265876879
ISBN: 0265876877
Format: Fester Einband
Anzahl Seiten: 308
Gewicht: 567g
Größe: H229mm x B152mm x T21mm
Jahr: 2017



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