Date of Graduation

Spring 2011

Degree

Master of Science in Geospatial Sciences

Department

Geography, Geology and Planning

Committee Chair

Kevin Mickus

Keywords

gravity, magnetic, Tri-State, lead-zinc, geophysics

Subject Categories

Cosmology, Relativity, and Gravity | Geology | Mining Engineering

Abstract

The Tri-State mining district of NE Oklahoma, SE Kansas and SW Missouri was one of the world class Mississippi Valley type lead-zinc mining districts. It is one of several such deposits found in the Ozarks region of the U.S. To study the nature and extent of regional structures plus the relationship between Precambrian basement topography and lithology to the known ore deposits, existing gravity data were merged with 500 new data points. Residual gravity and magnetic maps were constructed using wavelength filtering. Both maps highlight an obvious NW-trending anomaly pattern which may be caused by variations in the Precambrian basement topography. Mining fields are associated with either a gravity and/or magnetic anomaly. In addition, a horizontal magnetic gradient map was constructed which shows obvious NW and NE-trending anomalies. In order to aid in determining the source of the gravity and magnetic anomalies, three two-dimensional models were constructed across the Tri-State district. The number of constraints is limited but the models suggest that the high-amplitude maxima are caused by a combination of basement topography and mafic material within the Precambrian. The known mining fields are found to be either at the intersection of NW- and NE-trending magnetic anomalies, implying that these linear anomalies may be faults that carried the ore-fluids from the south, and/or on the sides of mafic-rich Precambrian basement topographic highs.

Copyright

© Matt Lane Cosatt

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