Results 191 to 200 of about 1,938 (228)

Tracing the Cadomian magmatism with detrital/inherited zircon ages by in-situ U–Pb SHRIMP geochronology (Ossa-Morena Zone, SW Iberian Massif) [PDF]

Lithos, 2011
U–Pb SHRIMP geochronology on zircon extracted from a granite, a sandstone and a quartzite of the SW Iberian Massif (Ossa-Morena Zone), was used in order to investigate the contribution of Late Neoproterozoic (Cadomian) tectonothermal history to the ...
M FRANCISCO Pereira, M Chichorro, A Rita Sola   +2 more
exaly   +2 more sources

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The nature of zircon inheritance in two granite plutons

Earth and Environmental Science Transactions of the Royal Society of Edinburgh, 1992
ABSTRACTUsing zircons taken from two granite plutons, Strontian (Caledonian, northwestern Scotland) and Kameruka (Bega Batholith, southeastern Australia), this study presents observations that have a bearing on refractory zircons as provenance indicators.
B. A. Paterson, W. E. Stephens, G. Rogers, I. S. Williams, R. W. Hinton, D. A. Herd   +5 more
openaire   +1 more source

Evidence for inherited Sm?Nd isotopes in granitoid zircons

Contributions to Mineralogy and Petrology, 1992
This study presents evidence to show that, in addition to preserving U−Pb isotope systematics, refractory zircons also preserve, at least in part, an inherited Sm−Nd isotope component. The zircons analyzed during this study were taken from the Strontian granitoid (NW Scotland). The inner intrusion of this composite pluton is known from a previous study
Rogers, G., Stephens, W. E., Paterson, B. A.   +2 more
openaire   +1 more source

A Yilgarn seed to the Pilbara Craton (Australia)? Evidence from inherited zircons

Geology, 2019
Abstract Knowledge of the age and compositional architecture of Archean cratonic lithosphere is critical for models of geodynamics and continental growth on early Earth, but can be difficult to unravel from the exposed geology. We report the occurrence of numerous >3.7 Ga zircon crystals in 3.45 Ga rhyolites of the eastern Pilbara ...
Andreas Petersson, Anthony I.S. Kemp, Martin J. Whitehouse   +2 more
openaire   +1 more source

Hot and cold granites? Implications of zircon saturation temperatures and preservation of inheritance

Geology, 2003
Zircon saturation temperatures ( T Zr) calculated from bulk-rock compositions provide minimum estimates of temperature if the magma was undersaturated, but maxima if it was saturated. For plutons with abundant inherited zircon, T Zr provides a useful estimate of initial magma temperature at the source, an important parameter that is otherwise ...
Calvin F. Miller, Susanne Meschter McDowell, Russell W. Mapes   +2 more
openaire   +1 more source

Inherited zircons in the Mundi Mundi Granite, Broken Hill, New South Wales

Australian Journal of Earth Sciences, 1985
A heavy mineral concentrate from the undeformed Mundi Mundi Granite N of Broken Hill yielded very few zircons. U‐Th‐Pb measurements on microgram fractions of those extracted showed no indication of the stock's true 1500–1600 Ma intrusive event but revealed something inherited and of an age probably greater than 2 Ga.
J. A Cooper, K. R. Ludwig
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Trace elements and the behaviour of the U-Pb system in inherited and newly formed zircons

Contributions to Mineralogy and Petrology, 1974
The distribution of U, Y, P, and Ca was studied with an electron microprobe in detrital zircons from paragneisses of amphibolite to granulite facies as well as in zircons formed in their present-day host rocks, such as a granite, anatectic and aplitic gneisses and a migmatite from the Southern Alps.
Sommerauer, J., Köppel, V.
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From richer to poorer: zircon inheritance in Pomona Island Granite, New Zealand

Contributions to Mineralogy and Petrology, 2010
Previous U–Pb zircon dating of the Pomona Island Granite (PIG) pluton (South Island, New Zealand) yielded either Permo-Carboniferous or Late Jurassic ages for five samples essentially indistinguishable in their field, petrographic, and geochemical characteristics. Detailed cathodoluminescence imaging and LA-ICP-MS dating of zircon in new and previously
J. M. Scott, J. M. Palin, A. F. Cooper, M. W. Sagar, A. H. Allibone, A. J. Tulloch   +5 more
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Hf isotopes in detrital and inherited zircons of the Pilbara Craton provide no evidence for Hadean continents

Precambrian Research, 2015
Predictions of large volumes of stabilized continental crust by the early Archaean stand in stark contrast to the actual amount of pre-3.5 Ga rocks presently exposed on Earth's surface. The Pilbara Craton of Western Australia, one of the best preserved Paleoarchean crustal blocks on Earth, is believed to have developed on a cryptic, possibly ≥3.8 Ga ...
Kemp, A., Hickman, A., Kirkland, Chris, Vervoort, J.   +3 more
openaire   +3 more sources

Probing for Proterozoic and Archean crust in the northern U.S. Cordillera with inherited zircon from the Idaho batholith

Geological Society of America Bulletin, 2012
Knowledge of the Precambrian history and crustal architecture of western North America is limited by the restricted extent of outcropping basement due to Phanerozoic sedimentary cover and magmatic disruption. Inherited zircon components in the magmatic rocks of the Idaho batholith provide a window into this largely obscured crust and are used here to ...
Richard M. Gaschnig, Jeffrey D. Vervoort, Reed S. Lewis, Basil Tikoff   +3 more
openaire   +1 more source