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Document Type

Research

Keywords

Sulfide mineral deposits, Linn County

Abstract

A hydrothermal sulfide mineral deposit is exposed at the Martin-Marietta Quarry (MMQ) near Cedar Rapids, Iowa. Mineralization occurs along solution-enlarged vertical joints in host rocks of the Silurian Scotch Grove and Gower formations. The hydrothermal minerals in general order of deposition are: marcasite, pyrite, sphalerite, calcite. Wall rock alteration is not extensive, and consists of solution enlargement of joints and dissemination of microscopic marcasite in the host rock. Fluid inclusion homogenization temperatures for sphalerite and calcite range from 69° to 99°C. The physical mineralogical similarities between the MMQ deposit and main-district Upper Mississippi Valley hydrothermal deposits evidence cogenesis. The origin of the MMQ deposit is considered in light of the East Central Iowa Basin model of Ludvigson, et al (1983a).

Publication Date

June 1984

Journal Title

Proceedings of the Iowa Academy of Science

Volume

91

Issue

2

First Page

70

Last Page

75

Copyright

© Copyright 1984 by the Iowa Academy of Science, Inc.

Language

EN

File Format

application/pdf

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