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TitlePreliminary results of gravity surveys over the Mackenzie Basin and Beaufort Sea
AuthorHornal, R W; Sobczak, L W; Burke, W E F; Stephens, L E
SourceEarth Physics Branch, Gravity Map Series no. 117-119, 1970, 12 pages (3 sheets), (Open Access)
PublisherCanada Department of Energy, Mines and Resources
MapsPublication contains 3 maps
Map Info.geophysical, gravity, ground, 1:1,000,000
Mediapaper; on-line; digital
RelatedThis publication contains the following publications
File formatpdf
ProvinceNorthwest Territories; Nunavut
NTS85; 86; 95; 96; 97; 106; 107
Subjectsgeophysics; regional geology; interior plains; gravity surveys, ground; Bulmer Lake High; Coppermine Basaltic Province; Darnley Bay High; Kotaneelee Syncline; Precambrian; Cretaceous; Tertiary
Released1970 01 01; 2018 11 13
AbstractThree Bouguer anomaly maps at a scale of 1:1,000,000 and contoured at 5 mgal intervals have been prepared from 6,100 gravity observations made in the Interior Plains and on the Beaufort Sea from latitude 60°N to 72°N. The major features of the gravity field are: a gravity low over the Mackenzie Mountains which is attributed to a thickened sedimentary sequence and a deeper crustmantle boundary; a relatively positive anomaly of 50 mgal striking north from Trout Lake to Great Bear Lake which reflects a ridge or trough of mafic rock within the Precambrian basement; a negative anomaly over the Mackenzie River delta of 55 mgal which results from the deposition of more than 21,000 feet of Cretaceous and Tertiary sediments; and a circular positive anomaly of 130 mgal situated south of Darnley Bay which is explained by a cone-shaped basic intrusion. Smaller variations in the gravity field in the Interior Plains may be attributed to changes in the depth to the Precambrian basement and density variations within the sedimentary column.