A Gravity Survey of the Continental Shelf south of Cape Sable, Nova Scotia

1974 ◽  
Vol 11 (9) ◽  
pp. 1329-1334 ◽  
Author(s):  
A. B. Watts
Keyword(s):  
Nova Scotia ◽  
Continental Shelf ◽  
Continental Margin ◽  
Gravity Anomalies ◽  
Granitic Rocks ◽  
Gravity Survey ◽  
Bouguer Gravity ◽  
Eastern Canada ◽  
Bouguer Gravity Anomalies ◽  
Basement Rocks

The western part of the continental shelf off Nova Scotia is associated with a region of relatively low Bouguer gravity anomalies. The gravity 'low' reaches a minimum of −23 mgal about 20 km south of Cape Sable Island, Nova Scotia. Computations suggest the 'low' can be explained by an outward sloping body about 40 km wide and up to 15 km thick. The gravity 'low' is interpreted as caused by granites or granitic rocks which intrude the pre-Mesozoic basement rocks underlying the shelf. The granites or granitic rocks may extend to within about 50 km of the eastern Canada continental margin.

THE CORRELATION BETWEEN PRE‐CAMBRIAN ROCK DENSITIES AND BOUGUER GRAVITY ANOMALIES NEAR PARRY SOUND, ONTARIO

Geophysics ◽  
1954 ◽  
Vol 19 (1) ◽  
pp. 76-88
Author(s):  
C. H. G. Oldham
Keyword(s):  
Gravity Anomaly ◽  
Gravity Anomalies ◽  
Canadian Shield ◽  
Gravity Survey ◽  
Uniform Density ◽  
Bouguer Gravity ◽  
Geological Evidence ◽  
Bouguer Gravity Anomaly ◽  
Bouguer Gravity Anomalies

A gravity survey and a survey of rock densities have been carried out over an area of two thousand square miles near Parry Sound. A closed positive Bouguer gravity anomaly of thirty milligals was delineated, and a considerable variation was found to exist in the densities of pre‐Cambrian gneisses. In most previous interpretations of gravity over the Canadian Shield the gneisses have been assumed to possess a uniform density and anomalies have been attributed to changes in the thickness of horizontal crustal layers. In this paper it is shown that the Parry Sound anomaly can be explained in terms of structures within the crust taking the form of projections downward of the density variations found at the surface. The postulated structure is a nearly circular basin of dense gneisses. The shape is reasonable and agrees with such geological evidence as is available.

Modeling of the Bouguer Gravity Anomalies for Mineral Prospection

2021 ◽  
Author(s):  
J.S. Kayode ◽  
M.H. Arifin ◽  
A. Omar ◽  
N. Sulaiman ◽  
A. Dzulkifli ◽  
...  
Keyword(s):  
Gravity Anomalies ◽  
Bouguer Gravity ◽  
Bouguer Gravity Anomalies
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