Uplift structure of the southern Kapuskasing zone from 2.45 Ga dike swarm displacement

Halls, H. C.; Zhang, Baoxing

doi:10.1130/0091-7613(1998)026<0067:usotsk>2.3.co;2

Cited by 35 publications

(18 citation statements)

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“…The precipitation of submicroscopic magnetite in feldspars is generally considered to be a response to slow cooling at deeper crustal levels and such magnetite grains are typically the carriers of high unblocking temperature stable remanence residing in single domains (Morgan and Smith, 1984;Halls and Zhang, 1998). Remanence in the granulite facies terrane has been shown by Zhang and Piper (1994) to be resident in multiple phases of magnetite precipitation in micro-fractures during uplift decompression postdating deformation and metamorphism.…”

Section: Discussionmentioning

confidence: 98%

Palaeomagnetism of Precambrian dyke swarms in the North China Shield: The ∼1.8Ga LIP event and crustal consolidation in late Palaeoproterozoic times

Piper

Zhang

Huang

et al. 2011

Journal of Asian Earth Sciences

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Section: Discussionmentioning

confidence: 98%

Palaeomagnetism of Precambrian dyke swarms in the North China Shield: The ∼1.8Ga LIP event and crustal consolidation in late Palaeoproterozoic times

Piper

Zhang

Huang

et al. 2011

Journal of Asian Earth Sciences

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“…Some dikes contain clouded feldspars, indicating exsolution of Fe-oxides related to slow cooling and emplacement at depth [Poldervaart and Gilkey, 1954;Halls et al, 1994]. Because of our interest in paleosecular variation, we avoided zones where only clouded feldspars have been reported (such as the Kapuskasing Structural Zone) and concentrated instead on other areas with clear feldspars (as shown on the maps of Halls and Zhang [1998]). …”

Section: Field Samplingmentioning

confidence: 99%

Secular variation of the Late Archean–Early Proterozoic geodynamo

Смирнов

Tarduno

2004

Geophysical Research Letters

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We report new paleomagnetic data from ∼2.5 Ga dikes of the Superior Province and derive estimates of paleosecular variation. When combined with data from coeval dikes of the Karelia Craton (Russia) and older (∼2.7 Ga) volcanics of the Pilbara Craton, these estimates suggest a latitudinal variation of secular variation similar to that of the last 5 million years, but with potentially smaller quadrupole family contributions. The observations are consistent with some numerical models of the field that suggest a more dipolar field when the Earth had a much smaller solid inner core.

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“…Note that the southern end of the Kapuskasing zone is extended to include the newly discovered Pineal Lake block, which is later offset sinistrally from the Chapleau block along a north-south fault, as shown by Halls and Zhang (1998), and that north-south-trending folds expected from the model are observed (see fig. 3 of Halls and Zhang 1998). (C) The idealized development of localized fault-bounded uplifts and associated folds as illustrated by Ramsay and Huber (1987).…”

Section: Discussionmentioning

confidence: 88%

A gravity profile across southern Saganash Lake fault: implications for the origin of the Kapuskasing Structural Zone

Nitescu¹,

Halls²

2002

Can. J. Earth Sci.

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A high-resolution gravity profile, with station elevations and locations determined by a differential Global Positioning System, shows that the Saganash Lake fault that defines the northwestern boundary of the southern Kapuskasing Structural Zone (KSZ) is southeast dipping and of reverse type. Previous interpretations of a normal fault, caused by crustal collapse following east-verging thrusting along the Ivanhoe Lake fault that forms the southeastern boundary of the KSZ are no longer tenable. Instead, the reverse nature of the Saganash Lake fault is more in harmony with a model of the Kapuskasing zone, whereby its fault-bounded, uplifted blocks are positive flower structures formed by dextral shear along a zone of left-stepping en echelon faults.Résumé : Un profil gravimétrique à haute résolution, dont l'emplacement et l'élévation des stations ont été déterminés par des méthodes de GPS différentiel, montre que la faille du lac Saganash, qui définit la limite nord-ouest de la zone de Kapuskasing sud, est de type inversé et qu'elle a un pendage vers le sud-est. Des interprétations antérieures d'une faille normale, causée par un effondrement de la croûte après un chevauchement à vergence est le long de la faille du lac Ivanhoe, qui forme la limite sud-est de la zone de Kapuskasing, ne tiennent plus. La nature inversée de la faille du lac Saganash correspond mieux à un modèle de la zone de Kapuskasing selon lequel ses blocs soulevés et limités par des failles sont des structures positives de « fleurs » formées par un cisaillement dextre le long d'une zone de faille en échelons senestres.[Traduit par la Rédaction] Nitescu and Halls 480

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Uplift structure of the southern Kapuskasing zone from 2.45 Ga dike swarm displacement

Cited by 35 publications

References 0 publications

Palaeomagnetism of Precambrian dyke swarms in the North China Shield: The ∼1.8Ga LIP event and crustal consolidation in late Palaeoproterozoic times

Palaeomagnetism of Precambrian dyke swarms in the North China Shield: The ∼1.8Ga LIP event and crustal consolidation in late Palaeoproterozoic times

Secular variation of the Late Archean–Early Proterozoic geodynamo

A gravity profile across southern Saganash Lake fault: implications for the origin of the Kapuskasing Structural Zone

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