Structure of the Early Proterozoic Hurwitz Group in the Tavani area, Keewatin, Northwest Territories

1991 ◽  
Vol 28 (7) ◽  
pp. 1078-1095 ◽  
Author(s):  
Adrian F. Park ◽  
Steven Ralser
Keyword(s):  
Northwest Territories ◽  
Structural Study ◽  
Local Response ◽  
Structural Domains ◽  
Structural Pattern ◽  
Early Proterozoic ◽  
Hurwitz Group ◽  
Archean Basement

A structural study of the Early Proterozoic Hurwitz Group has been carried out in the Tavani area, approximately 80 km southwest of Rankin Inlet, District of Keewatin, Northwest Territories. The Hurwitz Group, in the Tavani area, consists of orthoquartzites of the Kinga Formation (Whiterock Lake Member) and quartz-feldspar arenites and litharenites of the Tavani Formation. More localized lithologies include siltstone, sandstones, breccia, and shales beneath the Whiterock Lake Member and conglomerate, shales, and shale-clast breccias within the Tavani Formation.Open, northeast-trending folds dominate the Hurwitz Group, although overturned folds and easterly trending structures are developed locally. Later northwest-trending faults complicate the northeast-trending structural pattern. Three structural domains are defined: north of the Wilson River, the Whiterock Syncline, and the Last Lake belt. The interrelationship of folding and faulting creates distinctive patterns in each domain, though overall, folding is demonstrated to be a local response to basement faulting, including reactivation of Archean structures. An overall north–south compressive regime is envisaged in which heterogeneities in the Archean basement are responsible for local peculiarities.

Early Aphebian basaltic volcanism in the southern District of Keewatin, Northwest Territories

1976 ◽  
Vol 13 (7) ◽  
pp. 1003-1005 ◽  
Author(s):  
Roy V. Beavon
Keyword(s):  
Northwest Territories ◽  
Geological Survey ◽  
Basaltic Volcanism ◽  
Dike Swarm ◽  
Southern District ◽  
Hurwitz Group ◽  
Textural Evidence ◽  
Archean Basement

A thin formation of folded mafic flows resting unconformably on Archean basement is informally named the Spi Lake basalt. Stratigraphic, structural, and textural evidence suggests that these lavas were probably fed from a diabase dike swarm dated at 2250+ m.y. by the Geological Survey of Canada. The Spi Lake basalt is overlain by conglomerate that may represent the base of the Hurwitz Group.

Initiation of ∼2.45-2.1 Ga intracratonic basin sedimentation of the Hurwitz Group, Keewatin Hinterland, Northwest territories, Canada

1997 ◽  
Vol 81 (3-4) ◽  
pp. 265-297 ◽  
Author(s):  
Lawrence B. Aspler ◽  
Jeffrey R. Chiarenzelli
Keyword(s):  
Northwest Territories ◽  
Intracratonic Basin ◽  
Hurwitz Group

Paleomagnetism of the Great Slave Supergroup, Northwest Territories, Canada: the Stark Formation

1976 ◽  
Vol 13 (4) ◽  
pp. 563-578 ◽  
Author(s):  
D. K. Bingham ◽  
M. E. Evans
Keyword(s):  
Northwest Territories ◽  
North American ◽  
Geomagnetic Field ◽  
Pole Position ◽  
The West ◽  
Stratigraphic Sequence ◽  
Polar Wander ◽  
Early Proterozoic ◽  
The North ◽  
Polarity Reversals

Paleomagnetic results from 55 sampling sites throughout the Stark Formation are reported. The known stratigraphic sequence of these sites enables the behaviour of the geomagnetic field in these remote times (1750 m.y.) to be elucidated. Two polarity reversals are identified and these represent potentially useful correlative features in strata devoid of index fossils. One of these is investigated in detail and indicates that behaviour of the geomagnetic field during polarity reversals was essentially the same in the early Proterozoic as it has been over the last few million years. The pole position (145°W, 15°S, dp = 3.5, dm = 6.9) lies far to the west of that anticipated from earlier results, implying further complexity of the North American polar wander curve. Possible alternatives to this added complexity are discussed.

The Spi Group: a post-Archean, pre-2.1 Ga rift succession, Trans-Hudson hinterland

1991 ◽  
Vol 28 (11) ◽  
pp. 1863-1872 ◽  
Author(s):  
Judith G. Patterson
Keyword(s):  
Alluvial Fan ◽  
History Of ◽  
Group A ◽  
Hurwitz Group ◽  
Archean Basement

A succession of mafic flows intercalated with sandstone and overlain by conglomerate, herein named the Spi Group, lies unconformably on Archean basement and is preserved in a syncline near Spi Lake, N.W.T. An alluvial fan setting near active rift fault escarpments is the interpreted environment of deposition. The nearby Montgomery Lake Group, Mackenzie Lake metasediments, and Padlei Formation at the base of the Hurwitz Group are possible correlatives of the Spi Group; diabase dykes of the Kaminak swarm, common in the Archean basement, are possibly related to the mafic flows. Correlation with the upper, coarse clastic part of the Hurwitz Group (Tavani Formation) is discounted because the Spi conglomerate does not contain clasts of Hurwitz lithology. The Montgomery Lake, Padlei and Spi successions are interpreted as being rift-related, and are older than the 2.1 Ga gabbro that intrudes the Hurwitz Group. Recognition of widespread rifting in this part of the Hearne Province constrains tectonic modelling of the preorogenic history of the Trans-Hudson hinterland.

scholarly journals Early Proterozoic (1.9 Ga) Thrombolites of the Rocknest Formation, Northwest Territories, Canada

Palaios ◽  
1992 ◽  
Vol 7 (3) ◽  
pp. 305 ◽  
Author(s):  
Linda C. Kah ◽  
John P. Grotzinger
Keyword(s):  
Northwest Territories ◽  
Early Proterozoic
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