Results 131 to 140 of about 1,451 (172)
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The Journal of Geology, 2001
Mesoproterozoic intrusive and granulite-grade metamorphic rocks in southern California have been inferred to be exotic to North America on the basis of perceived chronologic incompatibility with autochthonous cratonal rocks. Ion microprobe geochronology indicates that zircons in granulite-grade gneisses, dated at 1.4 Ga using conventional methods, are ...
Barth, A.P., Wooden, J.L., Coleman, D.S.
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Mesoproterozoic intrusive and granulite-grade metamorphic rocks in southern California have been inferred to be exotic to North America on the basis of perceived chronologic incompatibility with autochthonous cratonal rocks. Ion microprobe geochronology indicates that zircons in granulite-grade gneisses, dated at 1.4 Ga using conventional methods, are ...
Barth, A.P., Wooden, J.L., Coleman, D.S.
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Quaternary International, 2007
Abstract We used the sensitive high-resolution ion microprobe reverse-geometry (SHRIMP-RG) to date pedogenic opal using the 230 Th–U system. Due to the high-spatial resolution of an ion microprobe (typically 30 μm), regions of pure opal within a sample can be targeted and detrital material can be avoided.
K. Maher +3 more
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Abstract We used the sensitive high-resolution ion microprobe reverse-geometry (SHRIMP-RG) to date pedogenic opal using the 230 Th–U system. Due to the high-spatial resolution of an ion microprobe (typically 30 μm), regions of pure opal within a sample can be targeted and detrital material can be avoided.
K. Maher +3 more
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U/Th dating by SHRIMP RG ion-microprobe mass spectrometry using single ion-exchange beads
Geochimica et Cosmochimica Acta, 2005Abstract We present a new analytical method for U-series isotopes using the SHRIMP RG (Sensitive High mass Resolution Ion MicroProbe) mass spectrometer that utilizes the preconcentration of the U-series isotopes from a sample onto a single ion-exchange bead. Ion-microprobe mass spectrometry is capable of producing Th ionization efficiencies in excess
James L. Bischoff +3 more
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Petrology, 2016
Remnants of the Early Paleozoic gabbro and gabbromonzonite with an age of 514.6 ± 7.2 Ma (U-Pb, Zrn, SHRIMP-RG, Turka Massif) were identified among basites spatially associated with Late Paleozoic granitoids of Western Transbaikalia. Obtained geochronological data are close to those of felsic subvolcanic rocks of the Early Cambrian volcanotectonic ...
A. A. Tsygankov +4 more
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Remnants of the Early Paleozoic gabbro and gabbromonzonite with an age of 514.6 ± 7.2 Ma (U-Pb, Zrn, SHRIMP-RG, Turka Massif) were identified among basites spatially associated with Late Paleozoic granitoids of Western Transbaikalia. Obtained geochronological data are close to those of felsic subvolcanic rocks of the Early Cambrian volcanotectonic ...
A. A. Tsygankov +4 more
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Timing of granitic magma mixing in the southeastern Gyeongsang Basin, Korea: SHRIMP-RG zircon data
International Geology Review, 2010Late Cretaceous calc-alkaline granites in the Gyeongsang Basin evolved through the mixing of mafic and felsic magmas. The host granites contain numerous mafic magmatic/microgranular enclaves of various shapes and sizes. New SHRIMP-RG zircon U–Pb ages of both granite and mafic magmatic/microgranular enclaves are 75.0 ± 0.5 Ma and 74.9 ± 0.6 Ma ...
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Geochimica et Cosmochimica Acta, 2013
Abstract The record of meteorite impacts on Earth is incomplete due to the destruction of impact craters by erosion and burial. Shocked minerals residing in sediments may help further document the impact record. To evaluate the survival of shocked minerals in fluvial systems we investigated ∼10,000 sand grains from seven sites along the Vaal River in
Erickson, T. +5 more
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Abstract The record of meteorite impacts on Earth is incomplete due to the destruction of impact craters by erosion and burial. Shocked minerals residing in sediments may help further document the impact record. To evaluate the survival of shocked minerals in fluvial systems we investigated ∼10,000 sand grains from seven sites along the Vaal River in
Erickson, T. +5 more
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Lithos, 2011
Abstract The ages of orthogneisses exposed in massifs of the Variscan chain can determine whether they are part of a pre-Neoproterozoic basement, a Neoproterozoic, Panafrican arc, or are, in fact, lower Paleozoic, and their isotopic compositions can be used to probe the nature of their source rocks, adding to the understanding of the types ...
Martinez, F.J. +7 more
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Abstract The ages of orthogneisses exposed in massifs of the Variscan chain can determine whether they are part of a pre-Neoproterozoic basement, a Neoproterozoic, Panafrican arc, or are, in fact, lower Paleozoic, and their isotopic compositions can be used to probe the nature of their source rocks, adding to the understanding of the types ...
Martinez, F.J. +7 more
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