9: Paleomagnetism of Keweenawan rocks

Halls, H. C.; Pesonen, L. J.

doi:10.1130/mem156-p173

Cited by 115 publications

(52 citation statements)

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“…1), respectively. (D) Reconstruction at 1100 Ma -Laurentia was constrained by the Logan dykes pole (Halls & Pesonen 1982, Davis & Sutcliffe 1985. (E) Reconstruction at 1000 Ma -Laurentia, Baltica, and Amazonia as shown in the reconstruction of Rodínia proposed by Li et al (2008).…”

Section: The Amazonian Craton In Gondwanamentioning

confidence: 99%

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Paleomagnetism of the Amazonian Craton and its role in paleocontinents

et al. 2016

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In the last decade, the participation of the Amazonian Craton on Precambrian supercontinents has been clarified thanks to a wealth of new paleomagnetic data. Paleo to Mesoproterozoic paleomagnetic data favored that the Amazonian Craton joined the Columbia supercontinent at 1780 Ma ago, in a scenario that resembled the South AMerica and BAltica (SAMBA) configuration. Then, the mismatch of paleomagnetic poles within the Craton implied that either dextral transcurrent movements occurred between Guiana and Brazil-Central Shield after 1400 Ma or internal rotation movements of the Amazonia-West African block took place between 1780 and 1400 Ma. The presently available late-Mesoproterozoic paleomagnetic data are compatible with two different scenarios for the Amazonian Craton in the Rodinia supercontinent. The first one involves an oblique collision of the Amazonian Craton with Laurentia at 1200 Ma ago, starting at the present-day Texas location, followed by transcurrent movements, until the final collision of the Amazonian Craton with Baltica at ca. 1000 Ma. The second one requires drifting of the Amazonian Craton and Baltica away from the other components of Columbia after 1260 Ma, followed by clockwise rotation and collision of these blocks with Laurentia along Grenvillian Belt at 1000 Ma. Finally, although the time Amazonian Craton collided with the Central African block is yet very disputed, the few late Neoproterozoic/Cambrian paleomagnetic poles available for the Amazonian Craton, Laurentia and other West Gondwana blocks suggest that the Clymene Ocean separating these blocks has only closed at late Ediacaran to Cambrian times, after the Amazonian Craton rifted apart from Laurentia at ca. 570 Ma.

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Section: The Amazonian Craton In Gondwanamentioning

confidence: 99%

“…For the reconstruction at 1100 Ma (Fig. 8D), only Laurentia is constrained by Logan sills pole (Halls & Pesonen 1982, Davis & Sutcliffe 1985. Finally, Fig.…”

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Paleomagnetism of the Amazonian Craton and its role in paleocontinents

et al. 2016

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“…Rb-Sr ages from postvolcanic sedimentary units, particularly the None-250 Figure 6 Sketch of apparent polar wander path for Lake Superior region units 1000-1500 Myr old (as listed in Table 3). After Van Schmus et al (1982) and Halls & Pesonen (1982). such Shale (1023+46 Myr; Chaudhuri & Faure 1967), yield ages close to 1100 Myr, which further indicates that volcanic activity could not have continued to much later than 1100 Myr ago.…”

Section: Geochronologymentioning

confidence: 98%

“…As mentioned above, there were at least two major reversals of the Earth's field during Keweenawan times (N to R, R to N) that can be used help establish relative ages. Also, the paleopole position migrated rapidly during Keweenawan times, so that poles from units relatively close together in age are spatially resolved on the polar wander path for the interval involved ( Figure 6; Van Schmus et al 1982, Halls & Pesonen 1982. The chronology that is summarized below is thus a result of both radiometric and paleomagnetic dating, along with traditional stratigraphic data.…”

Section: Geochronologymentioning

confidence: 99%

“…A series of papers by , Merk & Jirsa (1982), Daniels (1982), , Kalliokoski (1982), along with recent papers by Elmore (1984) and Catawww.annualreviews.org/aronline Annual Reviews cosinos (1981), provide good summaries of the geology of the sedimentary units. Van Schmus et al (1982) have summarized the geochronology of Keweenawan rocks in the Lake Superior region, and Halls & Pesonen (1982) have reviewed the paleomagnetic aspects. Table 1 briefly outlines the key stratigraphic relationships in the Lake Superior region, and Figure 4 gives the geology as exposed in the western part of Lake Superior.…”

Section: Litholo~tic Suitesmentioning

confidence: 99%

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The Midcontinent Rift System

Schmus¹,

Hinze²

1985

Annu. Rev. Earth Planet. Sci.

200

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Confirmation of progressive plate motion during the Midcontinent Rift's early magmatic stage from the Osler Volcanic Group, Ontario, Canada

Swanson‐Hysell

Vaughan

Mustain

et al. 2014

Geochem Geophys Geosyst

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As the supercontinent Rodinia was assembling ca. 1.1 billion years ago, there was extensive magmatism on at least five Proterozoic continents including the development of the North American Midcontinent Rift. New paleomagnetic data from 84 lava flows of the Osler Volcanic Group of the Midcontinent Rift reveal that there was a significant and progressive decrease in inclination between the initiation of extrusive volcanism in the region (ca. 1110 Ma) and ca. 1105 6 2 Ma (during the ''early stage'' of rift development). Paleomagnetic poles can be calculated for the lower portion of the reversed Osler Volcanic Group (40.9 N, 218.6 E, A 95 5 4.8 , N 5 30) and the upper portion of the reversed Osler Volcanic Group (42.5 N, 201.6 E, A 95 5 3.7 , N 5 59; this pole can be assigned the age of ca. 1105 6 2 Ma). This result is a positive test of the hypothesis that there was significant plate motion during the early stage of rift development. In addition to being a time of widespread volcanism on Laurentia and other continents, this interval of the late Mesoproterozoic was characterized by rapid paleogeographic change.

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9: Paleomagnetism of Keweenawan rocks

Cited by 115 publications

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Paleomagnetism of the Amazonian Craton and its role in paleocontinents

Paleomagnetism of the Amazonian Craton and its role in paleocontinents

The Midcontinent Rift System

Confirmation of progressive plate motion during the Midcontinent Rift's early magmatic stage from the Osler Volcanic Group, Ontario, Canada

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