Search Results - "Tohver, E."

Primordial and recycled helium isotope signatures in the mantle transition zone.

Authors: Timmerman, S. Honda, M. Burnham, A. D. et al.

Source: Science (pre-March 2025). 8/16/2019, Vol. 365 Issue 6454, p692-694. 3p. 4 Graphs.

Subjects: Basalt, Earth (Planet), Ratio & proportion, Diamonds, Helium isotopes

Paleomagnetism of Oligocene Hot Spot Volcanics in Central Queensland, Australia.

Authors: Hansma, J. Tohver, E.

Source: Journal of Geophysical Research. Solid Earth. Jul2019, Vol. 124 Issue 7, p6280-6296. 17p.

Palaeomagnetism of mid-Miocene leucitite volcanics in eastern Australia.

Authors: Hansma, J Tohver, E

Source: Geophysical Journal International. Oct2018, Vol. 215 Issue 1, p303-313. 11p.

Middle Permian paleomagnetism of the Sydney Basin, Eastern Gondwana: Testing Pangea models and the timing of the end of the Kiaman Reverse Superchron.

Authors: Belica, M.E. Tohver, E. Pisarevsky, S.A. et al.

Source: Tectonophysics. Mar2017, Vol. 699, p178-198. 21p.

Subjects: Paleomagnetism, Geological time scales, Volcanology, Plagioclase, Pangaea (Supercontinent), Gondwana (Continent)

Zircons from the Acraman impact melt rock (South Australia): Shock metamorphism, U–Pb and 40Ar/39Ar systematics, and implications for the isotopic dating of impact events.

Authors: Schmieder, M. Tohver, E. Jourdan, F. et al.

Source: Geochimica et Cosmochimica Acta. Jul2015, Vol. 161, p71-100. 30p.

Subjects: Zircon, Metamorphism (Geology), Uranium-lead dating, Environmental impact analysis, Scanning electron microscopes, Impact craters

Upper Permian magnetic stratigraphy of the lower Beaufort Group, Karoo Basin.

Authors: Lanci, L. Tohver, E. Wilson, A. et al.

Source: Earth & Planetary Science Letters. Aug2013, Vol. 375, p123-134. 12p.

Subjects: Paleomagnetism, Permian Period, Geological time scales, Sediments

Geographic Terms: Karoo Supergroup, Western Cape (South Africa)

Direct dating of carbonate remagnetization by ⁴⁰Ar/³⁹Ar analysis of the smectite–illite transformation

Authors: Tohver, E. Weil, A.B. Solum, J.G. et al.

Source: Earth & Planetary Science Letters. Oct2008, Vol. 274 Issue 3/4, p524-530. 7p.

Subjects: Optical diffraction, Fractions, Apodization, Diffraction loss

Late Mesoproterozoic Deformation of SW Amazonia (Rondônia, Brazil): Geochronological and Structural Evidence for Collision with Southern Laurentia.

Authors: Tohver, E. van der Pluijm, B. A. Scandolâra, E. et al.

Source: Journal of Geology. May2005, Vol. 113 Issue 3, p309-323. 15p.

Subjects: Cratons, Continents, Rocks, Geological time scales

Geographic Terms: Amazon River Region, Rondônia (Brazil : State), Brazil

Interaction of flexural shear, S–C fabrics, and oblique shear during folding of micaceous quartzite

Authors: Hippertt, J. Tohver, E.

Source: Journal of Structural Geology. Jun2002, Vol. 24 Issue 6/7, p1087. 13p.

Subjects: Outcrops (Geology), Folds (Geology), Shear (Mechanics)

Geochronological constraints on the age of a Permo–Triassic impact event: U–Pb and ⁴⁰Ar/³⁹Ar results for the 40km Araguainha structure of central Brazil

Authors: Tohver, E. Lana, C. Cawood, P.A. et al.

Source: Geochimica et Cosmochimica Acta. Jun2012, Vol. 86, p214-227. 14p.

Subjects: Geological time scales, Triassic stratigraphic geology, Lead isotopes, Uranium isotopes, Argon isotopes, Zircon, Crystallization, Geological formations

Geographic Terms: Araguaia River (Brazil), Brazil

Terrane transfer during the Grenville orogeny: tracing the Amazonian ancestry of southern Appalachian basement through Pb and Nd isotopes

Authors: Tohver, E. Bettencourt, J.S. Tosdal, R. et al.

Source: Earth & Planetary Science Letters. Nov2004, Vol. 228 Issue 1/2, p161-176. 16p.

Subjects: Orogeny, Structural geology, Isotopes, Nuclides

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Shaking a methane fizz: Seismicity from the Araguainha impact event and the Permian–Triassic global carbon isotope record.

Authors: Tohver, E. Cawood, P.A. Riccomini, C. et al.

Source: Palaeogeography, Palaeoclimatology, Palaeoecology. Oct2013, Vol. 387, p66-75. 10p.

Closing the Clymene ocean and bending a Brasiliano belt: Evidence for the Cambrian formation of Gondwana, southeast Amazon craton.

Authors: Tohver, E. Trindade, R. I. F. Solum, J. G. et al.

Source: Geology. Mar2010, Vol. 38 Issue 3, p267-270. 4p. 1 Diagram, 1 Graph, 2 Maps.

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Insights into the morphology, geometry, and post-impact erosion of the Araguainha peak-ring structure, central Brazil.

Authors: Lana, C. Souza Filho, C. R. Marangoni, Y. R. et al.

Source: Geological Society of America Bulletin; Sep/Oct2007, Vol. 119 Issue 9-10, p1135-1150, 16p, 7 Black and White Photographs, 3 Diagrams, 3 Maps

Late Paleoproterozoic (geon 18 and 17) reactivation of the Neoarchean Great Lakes Tectonic Zone, northern Michigan, USA: Evidence from kinematic analysis, thermobarometry and ⁴⁰Ar/³⁹Ar geochronology

Authors: Tohver, E. Holm, D.K. van der Pluijm, B.A. et al.

Source: Precambrian Research. Aug2007, Vol. 157 Issue 1-4, p144-168. 25p.

Two stage tectonic history of the SW Amazon craton in the late Mesoproterozoic: identifying a cryptic suture zone

Authors: Tohver, E. Pluijm, B.A. van der Mezger, K. et al.

Source: Precambrian Research. Apr2005, Vol. 137 Issue 1/2, p35-59. 25p.

Magnetic Fabric and Geochronology of a Cambrian "Isotropic" Pluton in the Neoproterozoic Araçuaí Orogen.

Authors: Temporim, F. A. Trindade, R. I. F. Tohver, E. et al.

Source: Tectonics. Jun2020, Vol. 39 Issue 6, p1-21. 21p.

Cryptic excess argon in metamorphic biotite: Anomalously old 40Ar/39Ar plateau dates tested with Rb/Sr thermochronology and Ar diffusion modelling.

Authors: Scibiorski, E. Jourdan, F. Mezger, K. et al.

Source: Geochimica et Cosmochimica Acta. Dec2021, Vol. 315, p1-23. 23p.