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Trace Element Studies and Their Bearing on the Occurrence of Porphyry-Type Molybdenum Mineralization in the Northern Breckenridge Mining District, Summit County, Colorado

Koenig, Mary Lisa
http://rave.ohiolink.edu/etdc/view?acc_num=osu1381404315

Abstract Details

1983, Master of Science, Ohio State University, Geological Sciences.
The Breckenridge mining district lies within the Colorado mineral belt, approximately 95 km west of Denver, Colorado. The district was mined for gold and silver from 1880's to about 1940. Recent studies in the area suggest that one or more porphyry metal systems may be present at depth within the district. The present study examines three regions of large-scale "stockwork-type" mineralization: the Jessie,Hamilton, and Cashier-Royal Tiger areas. Mid-Tertiary intrusions ranging in composition from granodiorite to quartz monzonite have intruded Pennsylvanian to Cretaceous sedimentary rocks within the district. Several periods of hydrothermalmineralization are associated with the igneous activity. Widespread chlorite and sericite alteration of plagioclase and biotite, plus carbonatization is present throughout the district. Intense alteration and mineralization are related spatially to a northeast-trending fracture zone across the district, and to the presence of bodies of intrusion and stockwork breccia. High temperature mineralization in both breccia types and in veins is indicated by the presence of pyrrhotite and galenobismutite, and by the occurrence of sphalerite stars in chalcopyrite. Concentrations of molybdenum, tungsten, and fluorine generally are low in the study areas, but, the greatest concentrations are related spatially to the intrusion breccias. The intrusion breccias may have tapped one or more deep-seated porphyry-metal systems. Of the areas studied, the Cashier-Royal Tiger area is the most likely choice for the site of an underlying porphyry-metal system.
Douglas E. Pride, Dr. (Advisor)
Ernest G. Ehlers, Dr. (Advisor)
198 p.
Geology; Mineralogy

Recommended Citations

Citations

  • Koenig, M. L. (1983). Trace Element Studies and Their Bearing on the Occurrence of Porphyry-Type Molybdenum Mineralization in the Northern Breckenridge Mining District, Summit County, Colorado [Master's thesis, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1381404315

    APA Style (7th edition)

  • Koenig, Mary. Trace Element Studies and Their Bearing on the Occurrence of Porphyry-Type Molybdenum Mineralization in the Northern Breckenridge Mining District, Summit County, Colorado . 1983. Ohio State University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1381404315.

    MLA Style (8th edition)

  • Koenig, Mary. "Trace Element Studies and Their Bearing on the Occurrence of Porphyry-Type Molybdenum Mineralization in the Northern Breckenridge Mining District, Summit County, Colorado ." Master's thesis, Ohio State University, 1983. http://rave.ohiolink.edu/etdc/view?acc_num=osu1381404315

    Chicago Manual of Style (17th edition)

osu1381404315
166
© 1983, all rights reserved.
This open access ETD is published by The Ohio State University and OhioLINK.