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Title: | The Sudbury Structure and Environs: Geophysical Analysis of Potential Fields and Paleomagnetism |
Authors: | Hearst, Bruce R. |
Advisor: | Morris, W. A. |
Department: | Geology |
Publication Date: | Aug-1994 |
Abstract: | <p>High - resolution seismic reflection data obtained along the Sudbury Structure Lithoprobe Transect have provided a geometrical and lithologic framework for the evaluation, modelling and interpretation of geophysical potential field and paleomagnetic data covering the Sudbury Structure and environs. Through the evaluation of new high resolution aeromagnetic and radiometric data accompanied by increased gravimetric, paleomagnetic, and rock physical property surveys, the structure of the Sudbury Igneous Complex and environs have provided new insights into the development of the Sudbury Structure. Analysis of the potential field and paleomagnetic data has determined that: 1) a broad regional magnetic anomaly can be ascribed to the Levack Gneiss Complex subjacent to the Sudbury Igneous Complex (SIC); 2) a zone of hydrothermal alteration associated with the southern contact between the Onwatin and Onaping formations which appears to be spatially related to a deep gravity high; 3) a magnetic high associated with the South Range contact of the SIC produced by the juxtaposition of rocks related to northward directed thrust faulting; 4) the North Range contact of the SIC is a simple layered contact which has undergone strike slip faulting; 5) the Cartier Granite Complex is composed of three distinct fault separated plutons (Birch Lake Granite, Cartier Granite, and Venetian Lake Granite) forming an arc around the SIC; 6) arcuate structures mimicking the North Range of the SIC and the Grenville Front are visible within the granite terrain to the north of the SIC; 7) the regional gravimetric setting of the SIC is heavily influenced by the presence of deep crust, upper mantle related fault and density structures; and 8) the main gravimetric signature associated with the SIC is derived from within 5 km of surface.</p> |
Description: | Title: The Sudbury Structure and Environs: Geophysical Analysis of Potential Fields and Paleomagnetism, Author: Robert B. Hearst, Location: Thode |
URI: | http://hdl.handle.net/11375/19560 |
Appears in Collections: | Open Access Dissertations and Theses |
Files in This Item:
File | Description | Size | Format | |
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Hearst_Robert_B_1996_master.pdf | Title: The Sudbury Structure and Environs: Geophysical Analysis of Potential Fields and Paleomagnetism, Author: Robert B. Hearst, Location: Thode | 24.96 MB | Adobe PDF | View/Open |
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