AbstractsEarth & Environmental Science

Structural and magnetic characteristics of the Belton anomaly, Cass County, Missouri

by Nagib Chamon

Institution: Missouri University of Science and Technology
Year: 1964
Record ID: 1586405
Full text PDF: http://hdl.handle.net/10355/35483


"A vertical intensity magnetic survey of approximately 156 square miles in Cass County, central-west Missouri, revealed a broad circular anomaly whose magnetic relief exceeds 1000 gammas. Surface rocks are very gently inclined and are of Pennsylvanian age. Crystalline basement rocks are at a depth of approximately 2400 feet. Analysis of the data shows that the Belton anomaly consists of discontinuous smaller magnetic anomalies surrounding the central part of this broad anomaly. The central area of the Belton anomaly is occupied by a magnetic low. Analytical calculation showed that the source of the magnetic disturbance is at least 3650 feet below the topographic surface, or 1250 feet below the known Precambrian surface. Profiles of theoretical anomalies created by magnetic bodies of simple geometrical forms and susceptibilities equal to the average common intrusive rocks were visually compared with the measured magnetic profiles. Those which depth are 3000 and 4000 feet were the ones that better simulate the measured magnetic field. The area could have fairly large magnetite bodies, but at a relative greater depth than is now economically mined" – Abstract, Page iii.