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A Discussion of Sherman-Type Deposits

By
BRIAN J. SKINNER, EDITOR, Economic Geology
BRIAN J. SKINNER, EDITOR, Economic Geology
91A Yale Station, New Haven, Connecticut 06520
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Published:
January 01, 1990

To the reader: During review it became apparent that two groups of authors in this volume had drawn different and incompatible conclusions concerning the origin of Sherman-type deposits. R. J. Johansing and T. B. Thompson, in their paper “Geology and origin of Sherman-type deposits, central Colorado,” concluded that the deposits formed during the Tertiary from basinal brines moving along thermal gradients controlled by igneous intrusions. An entirely different conclusion was drawn in the two-part paper “Late Mississippian karst caves and Ba-Ag-Pb-Zn mineralization in central Colorado,” in which Part I on “Geologic framework, mineralogy, and cave morphology” is by R. J. Tschauder, G. P. Landis, and R. Npyes; and Part II on “Fluid inclusion, stable isotope, and rock geochemistry data and a model of ore deposition” is by G. P. Landis and R. J. Tschauder. These authors concluded that Sherman-type deposits formed during the Mississippian from regional brines moving under a hydraulic gradient.

The differences between the two conclusions are so great it seems likely that at least one of the genetic interpretations is based either on an incomplete set of facts or on erroneous data. It is not apparent to the reviewers, to the editors of this monograph, or to me where the resolution may lie. Therefore, in order to assist readers and to help those who may carry out research on the deposits in the future, a series of questions have been addressed to both groups of authors. The questions are designed to explore the key differences between the two papers, and both groups of authors graciously agreed to respond and to allow their responses to be published. In addition, because some of the observations that each group considers to be facts are in dispute, both groups of authors have been asked to identify the points of factual disagreement in the other’s work. Both groups responded with a list of data they consider questionable, and these follow their replies to my questions.

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Contents

Economic Geology Monograph Series

Carbonate-Hosted Sulfide Deposits of the Central Colorado Mineral Belt

David W. Beaty
David W. Beaty
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;
Gary P. Landis
Gary P. Landis
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;
Tommy B. Thompson
Tommy B. Thompson
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Society of Economic Geologists
Volume
7
ISBN electronic:
9781629490021
Publication date:
January 01, 1990

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