A gravity survey of eastern Notre Dame Bay, Newfoundland

Miller, Hugh G. (1970) A gravity survey of eastern Notre Dame Bay, Newfoundland. Masters thesis, Memorial University of Newfoundland.

[English] PDF (Migrated (PDF/A Conversion) from original format: (application/pdf)) - Accepted Version Available under License - The author retains copyright ownership and moral rights in this thesis. Neither the thesis nor substantial extracts from it may be printed or otherwise reproduced without the author's permission. Download (5MB) [English] PDF - Accepted Version Available under License - The author retains copyright ownership and moral rights in this thesis. Neither the thesis nor substantial extracts from it may be printed or otherwise reproduced without the author's permission. (Original Version)

Abstract

A gravity survey was undertaken on the archipelago and adjacent coast of eastern Notre Dame Bay, Newfoundland. A total of 308 gravity stations were occupied with a mean station spacing of 2.5 km, and 9 gravity sub-bases were established. Elevations for the survey were determined by barometric and direct altimetry. The densities of rock samples collected from 223 sites were determined. -- A Bouguer anomaly map was obtained and a polynomial fitting technique was employed to determine the regional contribution to the total Bouguer anomaly field. Residual and regional maps based on a fifth-order polynomial were obtained. Several programs were written for the IBM 360/40 computer used in this and model work. -- Three-dimensional model studies were carried out and a satisfactory overall fit to the total Bouguer field was obtained. Several shallow features of the anomaly maps were found to correlate well with surface bodies, i.e. granite or diorite bodies. Sedimentary rocks had little effect on the gravity field. The trace of the Luke's Arm fault was delineated. -- The following new features were discovered: (1) A major structural discontinuity near Change Islands; (2) A layer of relatively high density (probably basic to ultrabasic rock) at 5 - 10 km depth.

Actions (login required)

View Item