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NARROW
GeoRef Subject
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all geography including DSDP/ODP Sites and Legs
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Africa
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Congo Craton (1)
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North Africa
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Atlas Mountains
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Moroccan Atlas Mountains
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Anti-Atlas (1)
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Morocco
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Moroccan Atlas Mountains
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igneous rocks
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igneous rocks
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metamorphic rocks
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metasedimentary rocks (1)
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minerals
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silicates
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orthosilicates
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nesosilicates
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zircon group
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zircon (2)
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Primary terms
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absolute age (4)
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Africa
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Congo Craton (1)
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North Africa
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Atlas Mountains
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Moroccan Atlas Mountains
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Anti-Atlas (1)
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Morocco
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Moroccan Atlas Mountains
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Anti-Atlas (1)
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Southern Africa
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Kalahari Craton (1)
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West African Craton (1)
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Arctic Ocean
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Nares Strait (1)
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Arctic region
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Greenland (1)
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Asia
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Far East
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China
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Altyn Tagh Fault (1)
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Hebei China (1)
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North China Platform (1)
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Tarim Platform (2)
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Siberia (2)
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Australasia
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Australia
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Amadeus Basin (1)
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Northern Territory Australia (1)
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Western Australia
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Yilgarn Craton (1)
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Canada
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Arctic Archipelago (1)
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Nunavut
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Ellesmere Island (1)
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Queen Elizabeth Islands
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Ellesmere Island (1)
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Western Canada
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continental drift (3)
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North America
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Canadian Shield
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Ogilvie Mountains (1)
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paleogeography (14)
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Paleozoic
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Precambrian
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upper Precambrian
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sedimentary rocks (2)
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tectonics (3)
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United States
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sedimentary rocks
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sedimentary rocks (2)
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A new Re-Os age constraint informs the dynamics of the Great Oxidation Event
Mid-Proterozoic geomagnetic field was more consistent with a dipole than a quadrupole: REPLY
Mid-Proterozoic geomagnetic field was more consistent with a dipole than a quadrupole
Reorienting the West African craton in Paleoproterozoic–Mesoproterozoic supercontinent Nuna
North China craton: The conjugate margin for northwestern Laurentia in Rodinia
Inverted South China: A novel configuration for Rodinia and its breakup
A positive test for the Greater Tarim Block at the heart of Rodinia: Mega-dextral suturing of supercontinent assembly: REPLY
Direct Mesoproterozoic connection of the Congo and Kalahari cratons in proto-Africa: Strange attractors across supercontinental cycles
A positive test for the Greater Tarim Block at the heart of Rodinia: Mega-dextral suturing of supercontinent assembly
RESEARCH FOCUS: Probing the complexities of magnetism in zircons from Jack Hills, Australia
Wyoming on the run—Toward final Paleoproterozoic assembly of Laurentia: REPLY
Paleomagnetic evidence for a large rotation of the Yukon block relative to Laurentia: Implications for a low-latitude Sturtian glaciation and the breakup of Rodinia
Wyoming on the run—Toward final Paleoproterozoic assembly of Laurentia
Reconstructing pre-Pangean supercontinents
Assembly and breakup of the core of Paleoproterozoic–Mesoproterozoic supercontinent Nuna
Late Neoproterozoic 40° intraplate rotation within Australia allows for a tighter-fitting and longer-lasting Rodinia
Rapid Early Cambrian rotation of Gondwana
Paleomagnetism and U–Pb geochronology of Franklin dykes in High Arctic Canada and Greenland: a revised age and paleomagnetic pole constraining block rotations in the Nares Strait region This is a companion paper to Denyszyn, S.W., Davis, D.W., and Halls, H.C. Paleomagnetism and U–Pb geochronology of the Clarence Head dykes, Arctic Canada: orthogonal emplacement of mafic dykes in a large igneous province. Canadian Journal of Earth Sciences, 46 (3): 155–167.
Paleomagnetism is the only quantitative method available to test for lateral motions by tectonic plates across the surface of ancient Earth. Here, we present several analyses of such motions using strict quality criteria from the global paleomagnetic database of pre–800 Ma rocks. Extensive surface motion of cratons can be documented confidently to older than ca. 2775 Ma, but considering only the most reliable Archean data, we cannot discern differential motion from true polar wander (which can also generate surface motions relative to the geomagnetic reference frame). In order to find evidence for differential motions between pairs of Precambrian cratons, we compared distances between paleomagnetic poles through precisely isochronous intervals for pairs of cratons. The existing database yields several such comparisons with ages ranging from ca. 1110 to ca. 2775 Ma. Only one pair of these ages, 1110–1880 Ma, brackets significantly different apparent polar wander path lengths between the same two cratons and thus demonstrates differential surface motions. If slightly less reliable paleomagnetic results are considered, however, the number of comparisons increases dramatically, and an example is illustrated for which a single additional pole could constrain differential cratonic motion into the earliest Paleoproterozoic and late Neoarchean (in the interval 2445–2680 Ma). In a separate analysis based in part upon moderately reliable paleomagnetic poles, if a specific reconstruction is chosen for Laurentia and Baltica between ca. 1265 and 1750 Ma, then those cratons’ rotated apparent polar wander paths show convergence and divergence patterns that accord with regional tectonics and appear to be remarkably similar to predictions from a platetectonic conceptual model. Carefully targeted and executed future paleomagnetic studies of the increasingly well-dated Precambrian rock record can imminently extend these tests to ca. 2700 Ma, and with substantially more effort, to perhaps as old as ca. 3500 Ma.