Journal ArticleDOI
Slab breakoff: a model for Caledonian, Late Granite syn-collisional magmatism in the orthotectonic (metamorphic) zone of Scotland and Donegal, Ireland
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TLDR
In this article, a model for calc-alkaline Late Granite (Siluro-Devonian) genesis in the metamorphic Caledonian orogenic belt of Ireland and Scotland is presented.About:
This article is published in Lithos.The article was published on 2002-06-01. It has received 304 citations till now. The article focuses on the topics: Continental crust & Metamorphic zone.read more
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Journal ArticleDOI
Time scale of an early to mid-Paleozoic orogenic cycle of the long-lived Central Asian Orogenic Belt, Inner Mongolia of China: Implications for continental growth
Ping Jian,Dunyi Liu,Alfred Kröner,Brian F. Windley,Yuruo Shi,Fuqin Zhang,Guanghai Shi,Laicheng Miao,Wei Zhang,Qi Zhang,Liqao Zhang,Jishun Ren +11 more
TL;DR: A detailed time scale for an orogenic cycle (oceanic accretion-subduction-collision) that provides significant insights into Paleozoic continental growth processes in the southeastern segment of the long-lived Central Asian Orogenic Belt (CAOB) is presented in this article.
Journal ArticleDOI
Petrogenesis of post-orogenic syenites in the Sulu Orogenic Belt, East China: geochronological, geochemical and Nd-Sr isotopic evidence
TL;DR: The Jiazishan metamorphic orogenic complex is composed of potassic to ultrapotassic pyroxene syenite and associated mafic dikes.
Journal ArticleDOI
Europe's rare earth element resource potential: An overview of REE metallogenetic provinces and their geodynamic setting
Kathryn Goodenough,J. Schilling,Erik Jönsson,Erik Jönsson,Per Kalvig,Nicolas Charles,Johann Tuduri,Eimear Deady,Martiya Sadeghi,Henrik Schiellerup,Axel H. E. Müller,Guillaume Bertrand,Nikolaos Arvanitidis,D. G. Eliopoulos,Richard Shaw,Kristine Thrane,Nynke Keulen +16 more
TL;DR: In this article, the potential geological resources of rare earth elements (REE) in Europe are investigated, and the most important European resources are associated with alkaline igneous rocks and carbonatites, although REE deposits are also known from a range of other settings.
Journal ArticleDOI
Low-T eclogite in the Dabie terrane of China: petrological and isotopic constraints on fluid activity and radiometric dating
TL;DR: In this paper, a kyanite-quartz vein was found within the low-T eclogite in the Dabie terrane, which are interpreted as pseudomorphs after former porphyroblasts of lawsonite.
Journal ArticleDOI
Geochemical and temporal evolution of Cenozoic magmatism in western Turkey: Mantle response to collision, slab break-off, and lithospheric tearing in an orogenic belt
Yildirim Dilek,Şafak Altunkaynak +1 more
TL;DR: In this article, the authors show that post-collisional magmatism in western Anatolia began in the Eocene, and has occurred in discrete pulses throughout the Cenozoic as it propagated from north to south, producing volcano-plutonic associations with varying chemical compositions.
References
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Book ChapterDOI
I- and S-type granites in the Lachlan Fold Belt
Bruce W. Chappell,A. J. R. White +1 more
Abstract: Granites and related volcanic rocks of the Lachlan Fold Belt can be grouped into suites using chemical and petrographic data. The distinctive characteristics of suites reflect source-rock features. The first-order subdivision within the suites is between those derived from igneous and from sedimentary source rocks, the I- and S-types. Differences between the two types of source rocks and their derived granites are due to the sedimentary source material having been previously weathered at the Earth's surface. Chemically, the S-type granites are lower in Na, Ca, Sr and Fe3+/Fe2+, and higher in Cr and Ni. As a consequence, the S-types are always peraluminous and contain Al-rich minerals. A little over 50% of the I-type granites are metaluminous and these more mafic rocks contain hornblende. In the absence of associated mafic rocks, the more felsic and slightly peraluminous I-type granites may be difficult to distinguish from felsic S-type granites. This overlap in composition is to be expected and results from the restricted chemical composition of the lowest temperature felsic melts. The compositions of more mafic I- and S-type granites diverge, as a result of the incorporation of more mafic components from the source, either as restite or a component of higher temperature melt. There is no overlap in composition between the most mafic I- and S-type granites, whose compositions are closest to those of their respective source rocks. Likewise, the enclaves present in the more mafic granites have compositions reflecting those of their host rocks, and probably in most cases, the source rocks.S-type granites have higher δ18O values and more evolved Sr and Nd isotopic compositions, although the radiogenic isotope compositions overlap with I-types. Although the isotopic compositions lie close to a mixing curve, it is thought that the amount of mixing in the source rocks was restricted, and occurred prior to partial melting. I-type granites are thought to have been derived from deep crust formed by underplating and thus are infracrustal, in contrast to the supracrustal S-type source rocks.Crystallisation of feldspars from felsic granite melts leads to distinctive changes in the trace element compositions of more evolved I- and S-type granites. Most notably, P increases in abundance with fractionation of crystals from the more strongly peraluminous S-type felsic melts, while it decreases in abundance in the analogous, but weakly peraluminous, I-type melts.
Journal ArticleDOI
Slab breakoff: A model of lithosphere detachment and its test in the magmatism and deformation of collisional orogens
TL;DR: In this paper, the authors present a model that suggests that oceanic lithosphere detaches from continental lithosphere during continental collision (slab breakoff), allowing an explanation of syn- to post-collisional magmatism and metamorphism.
Journal ArticleDOI
Extensional collapse of orogens
TL;DR: The extensional collapse of orogens offers a partial explanation for why oceans cyclically close and reopen in roughly the same places, preservation of very high pressure metamorphic rocks, for the return of orogenic large crustal thicknesses to normal without very much erosional denudation.
Journal ArticleDOI
A classification of volcanic and plutonic rocks using R1R2-diagram and major-element analyses — Its relationships with current nomenclature
TL;DR: The R1R2 chemical variation diagram, which includes all of the major cations, a mineralogical network, the degree of silica saturation, and the combined changes in Fe (Fe + Mg ) and Ab + Or ) An ratios in igneous rocks, is proposed where: X or R 1 = 4 Si − 11( Na+K ) − 2( Fe+Ti ) and Y or R 2 = 6 Ca+ 2Mg+ Al R1 and R2 are parameters calculated either from chemical analyses (oxide percentages converted to millications) or mod
Journal ArticleDOI
Implications of mantle plume structure for the evolution of flood basalts
TL;DR: In this article, the authors compare the physical and chemical characteristics of two flood basalt provinces (the Deccan and Karoo) with predictions of the dynamical model and conclude that the high-temperature melts associated with continental flood basalts are derived from hot, relatively uncontaminated plume-source mantle at the plume axis.