Journal ArticleDOI
Zircon and granite petrology.
TLDR
In this paper, a genetic classification of zircon populations from granitic rocks is proposed, with three main divisions: (1) granites of crustal or mainly crustal origin (sub) autochthonous and aluminous granites)]; (2) hybrid granites (calc-alkaline and sub-alkalinized series granites); (3) granite of mantle or mainly mantle origin (alkaline, tholeiitic series granite).Abstract:
The typologic study of zircon populations from granitic rocks lead to the proposition of a genetic classification with three main divisions: (1) granites of crustal or mainly crustal origin [(sub) autochthonous and aluminous granites)]; (2) granites of crustal+mantle origin, hybrid granites (calc-alkaline and sub-alkaline series granites); (3) granites of mantle or mainly mantle origin (alkaline and tholeiitic series granites). In detail, there are many petrogenetic variants of each of the following granitic rocks: granodiorite, monzogranite and alkaline granite. The variations observed with zircon typology are accompanied petrographically by modifications of associations of other main and accessory minerals, and on the field by the presence or absence of basic microgranular xenoliths, associated microgranites, rhyolites or basic rocks. In the typologic diagram, some endogenous non granitic rocks (i.e. migmatites, tonalites, rhyolites ...) show a logical distribution with regard to different genetic stocks of granitic rocks.read more
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Journal ArticleDOI
A-type granites: geochemical characteristics, discrimination and petrogenesis
TL;DR: A-type granites as mentioned in this paper were found to have high SiO2, Na2O+K2O, Fe/Mg, Ga/Al, Zr, Nb, Ga, Y and Ce, and low CaO and Sr.
Journal ArticleDOI
The Composition of Zircon and Igneous and Metamorphic Petrogenesis
Paul W.O. Hoskin,Urs Schaltegger +1 more
TL;DR: The importance of zircon in crustal evolution studies is underscored by its predominant use in U-Th-Pb geochronology and investigations of the temporal evolution of both the crust and lithospheric mantle as discussed by the authors.
Journal ArticleDOI
Plesovice zircon : A new natural reference material for U-Pb and Hf isotopic microanalysis
Jirri Slama,Jirri Slama,Jirri Slama,Jan Košler,Daniel J. Condon,James L. Crowley,Axel Gerdes,John M. Hanchar,Matthew S.A. Horstwood,George A. Morris,Lutz Nasdala,Nicholas Norberg,Urs Schaltegger,Blair Schoene,Michael Tubrett,Martin J. Whitehouse +15 more
TL;DR: The Plesovice zircon as discussed by the authors has a concordant U-Pb age with a weighted mean Pb-206/U-238 date of 337.13 +/- 0.37 Ma (ID-TIMS, 95% confidence limits, including tracer calibration uncertainty).
Journal ArticleDOI
Atlas of Zircon Textures
TL;DR: In this paper, a selection of both the most typical, but also of the less common, features seen in zircon, categorized according to the different geological processes responsible for their formation are presented.
Journal ArticleDOI
Zircon chemistry and magma mixing, SE China: In-situ analysis of Hf isotopes, Tonglu and Pingtan igneous complexes
William L. Griffin,William L. Griffin,Xiang Wang,Xiang Wang,Simon E. Jackson,Norman J. Pearson,Suzanne Y. O'Reilly,Xisheng Xu,Xisheng Xu,Xinmin Zhou +9 more
TL;DR: In this article, in-situ LAM-MC-ICPMS microanalysis shows large variations in 176Hf/177Hf (up to 15 eHf units) between zircons of different growth stages within a single rock, and between zones within single zircon grains, suggesting that each of the observed magmas in both complexes developed through hybridisation of ≥2 magmas with different sources.
References
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Book ChapterDOI
ORIGIN OF GRANITE IN THE LIGHT OF EXPERIMENTAL STUDIES IN THE SYSTEM NaAlSi3O8–KAlSi3O8–SiO2–H2O
O. F. Tuttle,N. L. Bowen +1 more
Journal ArticleDOI
Uranium-Lead Isotopic Variations in Zircons: A Case Study
Leon T. Silver,S. Deutsch +1 more
TL;DR: In this article, the authors used a single 250-pound block of Precambrian Johnny Lyon granodiorite from the Dragoon Quadrangle in Cochise County, Arizona, with a special attention to yield and nature of impurities.
Journal ArticleDOI
Granites and Their Enclaves. J. Didier, 1973. Elsevier, Amsterdam, 393 pp., Dfl. 100.00
Journal ArticleDOI
The Granite Controversy
TL;DR: In this article, the Granite Controversy has been studied in the context of geologiska foreningen i Stockholm Forhandlingar (GFH) and geology.
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