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Hearst dike swarm

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Journal Article
Published: 01 June 1990
Canadian Journal of Earth Sciences (1990) 27 (6): 767-783.
...Dennis O. Nelson; Donald A. Morrison; William C. Phinney Abstract The 2.45 Ga Matachewan–Hearst dike swarm was emplaced over 250 000 km 2 in diverse granitoid–greenstone and metasedimentary terranes of the Superior Province of Canada. The Fe-rich tholeiitic dikes host large, uniform plagioclase...
Journal Article
Published: 01 December 1984
Canadian Journal of Earth Sciences (1984) 21 (12): 1499-1506.
...Richard E. Ernst; Henry C. Halls Abstract Prominent north- to northwest-trending dikes (herein termed the Hearst swarm) west of the Kapuskasing Structural Zone (KSZ) in northern Ontario yield a paleomagnetic pole position of 48.6°N, 69.0°E, dm = 6.9, dp = 3.6 (60 samples from 12 dikes).Using...
Series: Economic Geology Monograph Series
Published: 01 January 1999
DOI: 10.5382/Mono.10.21
EISBN: 9781629490052
... ages postdate peak metamorphic conditions at 2.66 Ga and reflect thermal events documented elsewhere in the Abitibi and in the southern Superior province, including the Matachewan-Hearst dike swarm event at 2.45 Ga. ...
Journal Article
Published: 01 January 2000
Rocky Mountain Geology (2000) 35 (1): 7-30.
...David M. Cox; Carol D. Frost; Kevin R. Chamberlain Abstract The Kennedy dike swarm of the central and northern Laramie Mountains is the most extensive Precambrian dike swarm of the Wyoming province. The dikes occupy from 15 to 20% of a 100-km-wide exposure of Archean basement, and include diabasic...
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Journal Article
Journal: Geology
Published: 01 April 1997
Geology (1997) 25 (4): 299-302.
... data presented here for the 2473 Ma Matachewan and 2446 Ma Hearst diabase dike swarms in North America establish a critical temporal link with ancient flood-basalt volcanism in Karelia and constrain the timing of a very ancient magnetic field reversal on Earth. The potential volume, magnitude...
Journal Article
Journal: Economic Geology
Published: 01 November 2002
Economic Geology (2002) 97 (7): 1577-1606.
... of the Canadian Shield near Sudbury, Ontario. The East Bull Lake intrusive suite is part of a regional Paleoproterozoic magmatic event, extending from 2.49 to 2.44 Ga, which also includes bimodal volcanic rocks, felsic plutons, and the regionally extensive Hearst and Matachewan dike swarms. This regional magmatic...
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Journal Article
Published: 01 January 1991
Canadian Journal of Earth Sciences (1991) 28 (1): 58-76.
... mineral – whole-rock isochron age from one KGC sample is 2450 ± 30 Ma, identical to U–Pb ages for the Hearst–Matachewan dike swarm, a prominent feature in the KGC area. Regression of whole-rock and mineral-isotope data for one granitoid sample with a U–Pb zircon age of 2696 ± 1.5 Ma gives identical ages...
Journal Article
Published: 02 April 2000
Canadian Journal of Earth Sciences (2000) 37 (2-3): 135-164.
... gold deposits. Hypersaline CaCl 2 formation brines evolved in Paleoproterozoic glaciogenic sediments; these penetrated into the Archean basement where they redistributed gold and are pervasively present as low-temperature secondary brine inclusions. The Matachewan (2.5 Ga) and Hearst dyke swarms drove...
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Journal Article
Published: 24 October 2001
Canadian Journal of Earth Sciences (2001) 38 (11): 1541-1563.
... with the evolution of the KSZ ( Bates and Halls 1991 ). Fig. 1. Map of Matachewan dyke swarm (after Ernst and Halls 1984 ) showing sample traverses (thick black lines). Thin solid lines denote dykes; thin dashed lines, faults. Map locations: HP, Hornepayne; H, Hearst; ML, Missinaibi Lake; W, Wawa; C...
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Journal Article
Published: 03 March 2004
Canadian Journal of Earth Sciences (2004) 41 (3): 255-269.
... . Ernst R.E. Halls H.C. 1984 . Paleomagnetism of the Hearst dike swarm and implications for the tectonic history of the Kapuskasing zone, northern Ontario . Canadian Journal of Earth Sciences , 21 : 1499 – 1506 . Garland G.D. 1950 . Interpretation of gravimetric and magnetic...
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Journal Article
Published: 15 June 2007
Canadian Journal of Earth Sciences (2007) 44 (5): 643-664.
... and OL locate the Hornepayne, Hearst, Lake Nipigon, and Ogoki Lake areas, respectively. Dykes of the Biscotasing, Minto, and Inukjuak swarms are shown in grey to distinguish them from other nearby swarms. In the northeastern Superior Province, between Hudson and Ungava bays, a limited amount...
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Journal Article
Published: 01 July 2000
Exploration and Mining Geology (2000) 9 (3-4): 215-231.
... swarm; their strikes vary from northeast, east, east-southeast and southeast. The dikes that were bulk-sampled did not contain diamonds. The concentrates from till at Kapimchigama Lake contain abundant Mg-ilmenite/chromite which reflect a large pyroxenite dike (100 m by >1000 m) that has been mapped...
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Journal Article
Journal: Economic Geology
Published: 01 September 2008
Economic Geology (2008) 103 (6): 1203-1218.
... plagioclase glomerocrysts, and magnetic nature, the four diabase dikes in the Genex area are interpreted to be part of the Proterozoic (2454 ± 2 Ma: Heaman, 1988 ) Matachewan dike swarm that intruded the Kamiskotia and surrounding area ( Ernst, 1981 ; Osmani, 1991 ). In the Genex area, the dikes are fine...
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Image
F ig . 1. General geology of the Superior, Southern, and Grenville province...
Published: 01 November 2002
to the Sudbury structure. See text for discussion. EBLI = East Bull Lake intrusion; GFTZ = Grenville front tectonic zone; Twp = Township; arrows indicate the major areas of Matachewan and Hearst dike swarms north and northwest of Sudbury, respectively, solid star = greater city of Sudbury.
Journal Article
Published: 01 January 2005
Exploration and Mining Geology (2005) 14 (1-4): 1-30.
... the fractionation direction: presence of tourmaline, beryl, and ferrocolumbite; Mn content in garnet; Rb content in bulk K-feldspar; and Mg/Li and Nb/Ta ratios in bulk granite samples. Pegmatite dikes with the most economic potential for Li-Cs-Ta deposits occur the greatest distance (up to 10 km) from the parent...
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Journal Article
Published: 26 June 2002
Canadian Journal of Earth Sciences (2002) 39 (6): 933-942.
... of the southern Kapuskasing zone from 2.45 Ga dike swarm displacement . Geology , 26 : 67 – 70 . Halls H.C. Palmer H.C. Bates M.P. Phinney W.C. 1994 . Constraints on the nature of the Kapuskasing structural zone from the study of Proterozoic dyke swarms . Canadian Journal of Earth...
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Series: Society of Economic Geologists
Published: 01 January 2017
DOI: 10.5382/Rev.19.05
EISBN: 9781629491172
... sedimentary ferruginous carbonate rocks ( Wilson, 1912 ; Ridler, 1970 ; Ridler et al., 1975 ; Hinse et al., 1986 ; Hutchinson, 1993 ) or as stratiform carbonatites ( Stricker, 1978 ). Alkalic-shoshonitic volcanic rocks, albitic mafic dike swarms, and large syenitic-monzonitic intrusions are thought...
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Journal Article
Published: 17 August 2012
Canadian Journal of Earth Sciences (2012) 49 (9): 1005-1017.
... strain. This corroborates the notion that the Archean basement rocks behaved in a mechanically similar way to the SIC during folding. Four swarms of mafic dykes are known to occur in Archean rocks north and east of the Sudbury Basin: 2.45 Ga Matachewan dykes ( Ernst and Halls 1984 ; Heaman 1997...
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Journal Article
Published: 17 September 2003
Canadian Journal of Earth Sciences (2003) 40 (9): 1219-1237.
... and to the Neoarchean to Paleoproterozoic evolution of the lithospheric mantle beneath the central part of the western Churchill Province (wCP). Petrochemical studies of continental within-plate basaltic rocks, comprising both mafic dike swarms (e.g., Weaver and Tarney 1981 ; Boily and Ludden 1991 ; Cadman et al...
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Journal Article
Journal: Economic Geology
Published: 01 May 2001
Economic Geology (2001) 96 (3): 559-581.
... boundary ( Fig. 1 ). The East Bull Lake suite of intrusions is a remnant of a voluminous magmatic suite, developed within the southern margin of the Superior province, which includes the Matachewan-Hearst dike swarm and the Huronian Supergroup volcanic rocks ( Fahrig, 1987 ; Bennett et al., 1991...
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