dysprosium in alkalic magmas

Chapter 19: Continental Alkaline Magmatism

The last events in many complexes are late pods of Fe and REE-rich carbonatites. A fenite aureole surrounds the carbonatite phases and perhaps also the alkaline silicate magmas. After Le Bas (1987) Carbonatite magmas. Mineral. Mag., 44, 133-40. Winter (2001) An Introduction to Igneous and Metamorphic Petrology. Prentice Hall.

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Hydrothermal Alteration Revealed by Apatite Luminescence ...

The yellow-brown to orange-brown-luminescent apatite occurs with largely mafic I-type intrusions that host alkalic porphyry deposits, e.g., Mount Polley diorite and monzonite (49–56% SiO 2, Bath and Logan, 2006), or less felsic calc-alkalic host rocks such as Endako quartz monzonite (ca. .

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india jaw crusher dysprosium in alkalic magmas

dysprosium in alkalic magmas - Modeco. The magmas are of transitional (mildly alkalic) type, generated by relatively small-fraction (6-7 %) melting of a depleted mantle source From Cambridge English Corpus The paper continues by considering the changes which elites began to undergo in the, dysprosium in alkalic magmas -

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Dysprosium | chemical element | Britannica

Dysprosium (Dy), chemical element, a rare-earth metal of the lanthanide series of the periodic table. Dysprosium is a relatively hard metal and is silvery white in its pure form. It is quite stable in air, remaining shiny at room temperature. Dysprosium turnings ignite easily and .

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Sr‐Nd‐Hf‐Pb isotope and trace element evidence for the ...

1. Introduction [2] The role of mantle heterogeneity in generating the compositional diversity observed in arc magmas is difficult to decipher because it can be masked by contributions from the subducting slab. There is a general consensus that mantle melting in arcs occurs in response to input of a hydrous component derived from the subducting slab that generates hydrous minerals in the ...

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Amphibole megacrysts as a probe into the deep plumbing ...

Mar 16, 2017· Amphibole has been discussed to potentially represent an important phase during early chemical evolution of arc magmas, but is not commonly observed in eruptive arc rocks. Here, we present an in-depth study of metastable calcic amphibole megacrysts in basaltic andesites of Merapi volcano, Indonesia. Radiogenic Sr and Nd isotope compositions of the amphibole megacrysts overlap with the .

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Nb/Ta systematics in arc magma differentiation and the ...

Jan 16, 2019· Nb/Ta shows a strong negative correlation with Dy/Yb for high silica magmas (Fig. 1c). High Dy/Yb ratios in magmas are a unique signatures of garnet crystallization, which is favored during high ...

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Minerals | Free Full-Text | Petrogenesis of Heavy Rare ...

The Round Top rhyolite located in Trans-Pecos Texas is enriched in Be, F, Li, Nb, Rb, Sn, Th, U, Y, Zr, and rare earth elements (REEs). REE-bearing minerals are mainly ubiquitous nano-scale accessory phases throughout the groundmass, incorporated in synchysite-group minerals, xenotime-(Y), Y- and Ce-rich fluorite, and zircon. The rhyolite is peraluminous, high-silica, alkaline (not peralkaline ...

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Hydrothermal Alteration Revealed by Apatite Luminescence ...

The yellow-brown to orange-brown-luminescent apatite occurs with largely mafic I-type intrusions that host alkalic porphyry deposits, e.g., Mount Polley diorite and monzonite (49–56% SiO 2, Bath and Logan, 2006), or less felsic calc-alkalic host rocks such as Endako quartz monzonite (ca. .

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Amphibole megacrysts as a probe into the deep plumbing ...

Mar 16, 2017· Amphibole has been discussed to potentially represent an important phase during early chemical evolution of arc magmas, but is not commonly observed in eruptive arc rocks. Here, we present an in-depth study of metastable calcic amphibole megacrysts in basaltic andesites of Merapi volcano, Indonesia. Radiogenic Sr and Nd isotope compositions of the amphibole megacrysts overlap with the .

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Paleoproterozoic Synkinematic Magnesian High-K Magmatism ...

The magnesian high-K calc-alkaline intrusive of the Tamkoro-Bossangoa Massif, North Western Central African Republic, were synkinematically emplaced in a sinistral strike-slip shear zone of Paleoproterozoic age. The rock sequences consist of orthogneisses with abundant coarse- to medium-grained quartz monzodiorite, quartz diorite and medium- to fine-grained biotite granite composition and ...

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Magma dynamics of ancient Mt. Etna inferred from ...

Sep 28, 2017· Figure 1 (a) Ce contents of TSC cpx as a function of single-cpx pressure estimates (1σ uncertainty) superimposed on Etna stratigraphy (after Spilliaert et al., 2006).(b) Proportions of ancient Etna barometry from this study and previous work (cf.Supplementary Information, n = 287). (c) TSC cpx and 2001 eruption cpx (Viccaro et al., 2006) shown with Hyblean pyroxenite and peridotite cpx fields ...

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Rare Earth Elements in some representative arc lavas

10Be created by cosmic rays + oxygen and nitrogen in upper atmosphere and is eventually incorporated in clay-rich oceanic sediments. 10Be has a half-life of only 1.5 Ma so after ~6 half lives (10 Ma), 10Be is no longer detectable.10Be/9Be averages about 5000 x 10-11 in the uppermost oceanic sediments but in mantle-derived MORB and OIB magmas, & continental

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Peter W. Reiners Paul E. Hammond Æ Robert A. Duncan Young ...

alkalic basalt whereas TS lavas are subalkalic basalts and basaltic andesites (Fig. 2). DL lavas also have high TiO2 and Fe2O3, and low SiO2 relative to the TS lavas (Fig. 2, Table 1). In detail, there are subtle but notable compositional variations among samples from each suite. In .

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Government of Western Australia

calc-alkalic • Mainly high-K . Toolgana Supersuite Granites FOR004 FOR008 Grey screen = Proterozoic ... Dy/Ybstill much lower than expected for a true adakiteand reflect lower-pressure (mid-crustal) ... Toolgana Supersuite c. 1610 Ma magmas

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Geosciences | Free Full-Text | New Occurrence of ...

The Veria-Naousa ophiolite represents a dismembered unit in north Greece, which includes variably serpentinised lherzolite and harzburgite, locally intruded by a sparse network of dykes or thin layers of websterite and olivine-orthopyroxenite composition. The websterite and the olivine-orthopyroxenite show abundant petrographic and geochemical evidence (relic olivines with mantle affinities ...

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Effect of melt composition on basalt and peridotite ...

Interaction between basaltic melts and peridotites has played an important role in modifying the lithospheric and asthenospheric mantle during magma genesis in a number of tectonic settings. Compositions of basaltic melts vary considerably and may play an important role in controlling the kinetics of melt–peridotite interaction. To better understand the effect of melt composition on melt ...

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Minerals | Free Full-Text | Petrogenesis of Heavy Rare ...

The Round Top rhyolite located in Trans-Pecos Texas is enriched in Be, F, Li, Nb, Rb, Sn, Th, U, Y, Zr, and rare earth elements (REEs). REE-bearing minerals are mainly ubiquitous nano-scale accessory phases throughout the groundmass, incorporated in synchysite-group minerals, xenotime-(Y), Y- and Ce-rich fluorite, and zircon. The rhyolite is peraluminous, high-silica, alkaline (not peralkaline ...

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Lithium enrichment in intracontinental rhyolite magmas ...

Aug 16, 2017· Magmas analyzed in this study. Most of our analyzed samples are from the Middle Miocene McDermitt volcanic field (MVF) of Oregon and Nevada (Fig. 2b), where the largest Li resource in the United ...

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Publisher: GSA Journal: GEOL: Geology DOI:10.1130/G36734.1 ...

80 the copper-ore–forming magmas at depths close to the inferred lower crustal staging 81 chambers, we compare these intrusions with equilibrium crystallization experiments on a 82 compositionally similar (assessed by M values in Table 1; Hanchar and Watson, 2003) 83 high-K calc-alkalic dacite at 0.8 GPa (Table 1; Naney, 1983).

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Publisher: GSA Journal: GEOL: Geology DOI:10.1130/G36734.1 ...

80 the copper-ore–forming magmas at depths close to the inferred lower crustal staging 81 chambers, we compare these intrusions with equilibrium crystallization experiments on a 82 compositionally similar (assessed by M values in Table 1; Hanchar and Watson, 2003) 83 high-K calc-alkalic dacite at 0.8 GPa (Table 1; Naney, 1983).

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IGCP Project 510 "A-type Granites and Related Rocks ...

P-poor A-type granites. The author shows that both granite magmas were intruded in rapid succession over a period of about 10 Ma (about 330–320 Ma). The author proposes that the magma sources for the two types of granites were probably a mixture of fertile quartz-feldspathic rocks and micaceous metapelites enriched in LILE and Sn+W.

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30. MINERAL COMPOSITIONS IN LEG 144 LAVAS AND .

and may provide some insight into the tholeiitic or alkalic nature. However, there is considerable overlap in the clinopyroxene compo-sitions from Hawaiian tholeiitic and alkalic lavas (Fig. 1 A). By itself, this diagram is not diagnostic of the silica-saturation of a magma. The second diagram is a plot of Al(z) vs. TiO2 after Le Bas (1962 ...

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Syria - Mantle Plume

Primitive mantle-normalized (a) (K/La) N, (b) (Dy/Yb) N, (c) (Sm/Zr) N and (d) (Rb/Ba) N vs (La/Yb) N for the relatively primitive, least crustally contaminated N-DSFS lavas. The continuous curves show non-modal batch melting models for a lherzolite (with a primitive mantle composition) and a hornblendite metasomatic vein (AG4 of Pilet et al ...

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Avalon Rare Metals Inc: A Real Rare Earth Story

Alkalic igneous intrusions follow well-defined geological concepts with respect to generation, evolution, and development of their magmas (molten igneous rock). Alkalic igneous systems can be divided into carbonatite- and peralkaline-dominated complexes. ... for flat screen televisions and dysprosium and terbium in super magnets for hybrid cars ...

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Calc-alkaline magma series - Wikipedia

The calc-alkaline magma series is one of two main subdivisions of the subalkaline magma series, the other subalkaline magma series being the tholeiitic.A magma series is a series of compositions that describes the evolution of a mafic magma, which is high in magnesium and iron and produces basalt or gabbro, as it fractionally crystallizes to become a felsic magma, which .

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Geochemistry and geochronology of OIB-type, Early Jurassic ...

Nov 19, 2018· The Zhangguangcai Range in the Xing'an Mongolian Orogenic Belt, NE China, contains Early Jurassic (c. 188 Ma) Dabaizigou (DBZG) porphyritic dolerite.Compared with other island-arc mafic rocks, the DBZG dolerite is characterized by high trace-element contents, relatively weak Nb and Ta enrichments, and no Zr, Hf or Ti depletions, similar to OIB-type rocks.

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Paleoproterozoic Synkinematic Magnesian High-K Magmatism ...

The magnesian high-K calc-alkaline intrusive of the Tamkoro-Bossangoa Massif, North Western Central African Republic, were synkinematically emplaced in a sinistral strike-slip shear zone of Paleoproterozoic age. The rock sequences consist of orthogneisses with abundant coarse- to medium-grained quartz monzodiorite, quartz diorite and medium- to fine-grained biotite granite composition and ...

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Hornblende fractionation in high-K tholeiitic magmas ...

Hbl fractionation and high An content of plagioclase ( 90) in both rock series imply that both magmas are rich in H2O. H2O contents are estimated to be up to 4 wt% for both TH and CA magmas (Hamada and Fujii, 2007). Our model is incompatible with a common model, in .

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Reactive Melt Transport in the Mantle and Geochemical ...

Introduction and Background. Basaltic magmas provide some of the best constraints on the composition of the Earth's mantle and the heterogeneities within it by providing chemical information about their mantle sources (e.g. Weaver, 1991; Hart et al., 1992; Hofmann, 1997).But geochemical compositions of basaltic magmas reflect the compositions of their mantle sources only to the extent that ...

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