scholarly journals Geological and geochemical data from the Canadian Arctic Islands. Part V: saturate fraction gas chromatograms of organic extracts from cuttings and core samples from petroleum exploration boreholes

2007 ◽  
Author(s):  
M Obermajer ◽  
K Dewing ◽  
M G Fowler
Keyword(s):  
Canadian Arctic ◽  
Petroleum Exploration ◽  
Geochemical Data ◽  
Core Samples ◽  
Organic Extracts

Mixed local and ultra-distal volcanic ash deposition within the Upper Cretaceous Kanguk Formation, Sverdrup Basin, Canadian Arctic Islands

2019 ◽  
Vol 156 (12) ◽  
pp. 2067-2084 ◽  
Author(s):  
Michael A Pointon ◽  
Michael J Flowerdew ◽  
Peter Hülse ◽  
Simon Schneider ◽  
Martin J Whitehouse
Keyword(s):  
Upper Cretaceous ◽  
Volcanic Ash ◽  
Tectonic Setting ◽  
Active Continental Margin ◽  
Far East ◽  
Canadian Arctic ◽  
Volcanic Belt ◽  
Geochemical Data ◽  
Sverdrup Basin ◽  
Chukotka Volcanic Belt

AbstractThe Upper Cretaceous Kanguk Formation of the Sverdrup Basin, Canadian Arctic Islands, contains numerous diagenetically altered volcanic ash layers (bentonites). Eleven bentonites were sampled from an outcrop section on Ellesmere Island for U–Pb zircon secondary ion mass spectrometry dating and whole-rock geochemical analysis. Two distinct types of bentonite are identified from the geochemical data. Relatively thick (0.1 to 5 m) peralkaline rhyolitic to trachytic bentonites erupted in an intraplate tectonic setting. These occur throughout the upper Turonian to lower Campanian (c. 92–83 Ma) outcrop section and are likely associated with the alkaline phase of the High Arctic Large Igneous Province. Two thinner (<5 cm) subalkaline dacitic to rhyolitic bentonites of late Turonian to early Coniacian age (c. 90–88 Ma) are also identified. The geochemistry of these bentonites is consistent with derivation from volcanoes within an active continental margin tectonic setting. The lack of nearby potential sources of subalkaline magmatism, together with the thinner bed thickness of the subalkaline bentonites and the small size of zircon phenocrysts therein (typically 50–80 μm in length) are consistent with a more distal source area. The zircon U–Pb age and whole-rock geochemistry of these two subalkaline bentonites correlate with an interval of intense volcanism in the Okhotsk–Chukotka Volcanic Belt, Russia. It is proposed that during late Turonian to early Coniacian times intense volcanism within the Okhotsk–Chukotka Volcanic Belt resulted in widespread volcanic ash dispersal across Arctic Alaska and Canada, reaching as far east as the Sverdrup Basin, more than 3000 km away.

Drilling‐induced isothermal remanent magnetization

Geophysics ◽  
1990 ◽  
Vol 55 (1) ◽  
pp. 111-115 ◽  
Author(s):  
Michael J. Pinto ◽  
Michael McWilliams
Keyword(s):  
Remanent Magnetization ◽  
Mineral Exploration ◽  
Petroleum Exploration ◽  
Isothermal Remanent Magnetization ◽  
Scientific Drilling ◽  
Core Samples ◽  
Considerable Success

The recovery of core samples is important in petroleum exploration, mineral exploration, and scientific drilling projects; and often complete orientation of the samples (azimuth and plunge) is desirable. Recovered cores are usually not azimuthally oriented because of the costs associated with deployment and operation of downhole orientation tools. Inexpensive paleomagnetic orientation methods have been used with considerable success in the borehole environment (Van der Voo and Watts, 1978; Kodama, 1984; Bleakly et al., 1985a, b; Evans and Mailol, 1986; Layer et al., 1988; McWilliams and Pinto, 1988). In some cases, the technique has been hampered by secondary magnetizations associated with the drillstring and/or coring tool, magnetizations which have partially or completely overprinted the primary and secondary magnetizations used for orientation.

Geochemical data of diamond drill core samples adjacent to the Red Lake Indian Reservation, northern Minnesota

1993 ◽  
Author(s):  
Warren C. Day ◽  
R.L. Earhart ◽  
Paul H. Briggs ◽  
J.S. Mee ◽  
D.F. Siems ◽  
...  
Keyword(s):  
Geochemical Data ◽  
Drill Core ◽  
Indian Reservation ◽  
Diamond Drill ◽  
Core Samples ◽  
Red Lake

Geothermal gradients and terrestrial heat flow along a south‐north profile in the Sverdrup Basin, Canadian Arctic Archipelago

Geophysics ◽  
1990 ◽  
Vol 55 (8) ◽  
pp. 1105-1107 ◽  
Author(s):  
F. W. Jones ◽  
J. A. Majorowicz ◽  
A. F. Embry ◽  
A. M. Jessop
Keyword(s):  
Fluid Flow ◽  
Heat Flow ◽  
Lower Cretaceous ◽  
Canadian Arctic ◽  
Thermal Anomaly ◽  
Temperature Gradients ◽  
Petroleum Exploration ◽  
Canadian Arctic Archipelago ◽  
Sverdrup Basin ◽  
Sill Intrusion

Data from eleven petroleum exploration wells along a south‐north profile in the Sverdrup Basin of the Canadian Arctic Islands indicate large variations in temperature gradients(18 ± 2 to 39 ± 2 mK/m) and heat‐flow values [Formula: see text]. High values occur near the axis of the basin and values decrease systematically toward the southern and northern flanks of the basin. The basin axis in this area is the zone of maximum crustal attenuation and Lower Cretaceous dike and sill intrusion, but any thermal anomaly associated with these events will have dissipated by now. The present heat‐flow pattern is likely the result of thermal refraction or fluid flow in the basin.

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