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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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Southern Africa
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South Africa
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Vredefort Dome (2)
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Primary terms
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Africa
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Southern Africa
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South Africa
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Free State South Africa
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Vredefort Dome (2)
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Atlantic Ocean
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North Atlantic
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Gulf of Mexico (2)
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Ontario
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metamorphism (2)
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North America
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Canadian Shield
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Onaping Formation (1)
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sea water (1)
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structural analysis (3)
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tectonophysics (1)
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Shock-deformed zircon from the Chicxulub impact crater and implications for cratering process
Explosive interaction of impact melt and seawater following the Chicxulub impact event
Genetic Relationship Between Postcratering Dynamics and Footwall Deposit Formation at Sudbury, Ontario, Canada: Importance for Sulfide Ore Exploration
Field-based structural analyses addressing the formation of large terrestrial impact structures are rare. We present a field-based kinematic analysis and a three-dimensional (3-D) block model of prominent structures from supracrustal strata of the Vredefort Dome, the central uplift of the Vredefort impact structure. This study aims to better understand the kinematics of complex crater formation. Specifically, the configuration of prominent concentric and radial faults supports the hypothesis that the Vredefort Dome formed by centripetal rock movement followed by radial spreading of uplifted rocks. Centripetal rock movement led to the formation of radially disposed transpression zones, whereby distorted supracrustal strata are characterized by a remarkable structural continuity during central uplift formation. This continuity points to a rather strong mechanical coherence of strata throughout the process. Distortion of layers at the exposed crustal level was accomplished mostly by folding on the hundred-meter scale and is at variance with the concept of concentric normal faults accomplishing kilometer-scale slip within and toward the center of complex impact structures. Displacement magnitudes calculated for strata exposed in the Vredefort Dome indicate that the diameter of the transient cavity of the Vredefort impact structure was ~70 km at surface. All prominent structural elements of the Vredefort Dome can be explained by central uplift formation.