Results 141 to 150 of about 516 (186)

Is Myanmar jadeitite of Jurassic age? A result from incompletely recrystallized inherited zircon

Lithos, 2013
Abstract Zircons from two Myanmar jadeitite samples were separated for texture, mineral inclusion, U–Pb dating and trace element composition analyses. Three types of zircons, with respect to U–Pb isotope system, were recognized. Type I zircons are inherited ones, yielding an igneous protolith age of 160 ± 1 Ma; Type II zircons are metasomatic ...
Tzen-Fu Yui, J G Liou
exaly   +2 more sources

Inherited, enriched, heated, or recycled? Examining potential causes of Earth's most zircon fertile magmatic episode

Lithos, 2018
Abstract The majority of granitic magmas generated during the Grenville Orogeny (1.2–1.0 Ga) are extremely zirconium rich (Zr contents often >500 ppm) and thus typically contain very abundant zircon. The extreme zircon fertility of Grenville granitoids appears to be unique in the geological record – no major magmatic event before or after produced on
S.D. Samson, D.P. Moecher, A.M. Satkoski
exaly   +2 more sources

Development of the Archaean Mallina Basin, Pilbara Craton, northwestern Australia; a study of detrital and inherited zircon ages

Sedimentary Geology, 2001
Abstract SHRIMP U–Pb zircon dates are combined with an examination of the age distribution patterns and provenance of both detrital zircons and of zircon xenocrysts in granites to investigate the development of the Archaean Mallina Basin, in the granite–greenstone terrain of the Pilbara Craton, northwestern Australia.
D R Nelson, R H Smithies
exaly   +2 more sources

Zircon stability grids in crustal partial melts: implications for zircon inheritance

Contributions to Mineralogy and Petrology, 2021
Zircon inheritance is a common phenomenon in igneous rocks, although more frequent in granitoids. Zircons inherited from granite magmas mostly come from the source, not from wall rocks or xenoliths. Consequently, they can provide invaluable information about the source materials, melting temperature, and melt segregation conditions.
Fernando Bea, Irene Morales, José Francisco Molina, Pilar Montero, Aitor Cambeses   +4 more
openaire   +1 more source

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

Response of zircon to melting and metamorphism in deep arc crust, Fiordland (New Zealand): implications for zircon inheritance in cordilleran granites

Contributions to Mineralogy and Petrology, 2018
The Cretaceous Mount Daniel Complex (MDC) in northern Fiordland, New Zealand was emplaced as a 50 m-thick dyke and sheet complex into an active shear zone at the base of a Cordilleran magmatic arc. It was emplaced below the 20–25 km-thick, 125.3 ± 1.3 Ma old Western Fiordland Orthogneiss (WFO) and is characterized by metre-scale sheets of sodic, low ...
Shrema Bhattacharya, A. I. S. Kemp, W. J. Collins   +2 more
openaire   +2 more sources

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
openaire   +1 more source