Sm–Nd isotopic evidence for crustal contamination in the ca. 1750 Ma Wanapitei Complex, western Grenville Province, Ontario

1995 ◽  
Vol 32 (4) ◽  
pp. 486-495 ◽  
Author(s):  
S. A. Prevec
Keyword(s):  
Rare Earth ◽  
Earth Element ◽  
Crustal Contamination ◽  
Crustal Material ◽  
Zircon Geochronology ◽  
Light Rare Earth ◽  
Text Data ◽  
Grenville Province ◽  
Front Boundary ◽  
Depleted Mantle

The Wanapitei Complex consists of a variably metamorphosed gabbronorite lying immediately adjacent to the Grenville Front Boundary Fault. U–Pb zircon geochronology indicates a crystallization age of [Formula: see text] for a noritic component, with both Grenville-aged (ca. 1000 Ma) metamorphism and minor older inheritance indicated. Geochemical evidence is consistent with plagioclase–pyroxene fractionation, but indicates additional open-system behaviour. [Formula: see text] data indicate contamination of a depleted mantle by light rare earth element-enriched material during the Penokean. This was followed during emplacement by extensive contamination of the then isotopically near-chondritic magma with variable amounts of evolved Archean crustal material, on the order of 40% in extreme cases, generating εNd(1.75) values between 0 and −7.5.

U–Pb ages and Sm–Nd signature of two subsurface granites from the Fort Simpson magnetic high, northwest Canada

1991 ◽  
Vol 28 (7) ◽  
pp. 1003-1008 ◽  
Author(s):  
M. E. Villeneuve ◽  
R. J. Thériault ◽  
G. M. Ross
Keyword(s):  
Rare Earth ◽  
Isotopic Composition ◽  
Rare Earth Element ◽  
Earth Element ◽  
The Other ◽  
Zircon Geochronology ◽  
Light Rare Earth ◽  
Great Bear Magmatic Zone ◽  
Drill Holes ◽  
Nd Isotopic Composition

Two undeformed biotite granites recovered from exploratory hydrocarbon drill holes that penetrated basement in the Fort Simpson magnetic high were analyzed for U–Pb zircon geochronology and Sm–Nd isotopic composition. Both samples give crystallization ages of 1845 Ma, with errors of less than 5 Ma. This age overlaps with the waning stages of magmatism in the Great Bear magmatic zone of Wopmay Orogen, 200 km to the east. One sample has an initial εNd of +1.3 and a TDM of 2.14 Ga, whereas the other yielded an initial εNd of −2.1 and a TDM of 2.45 Ga. The latter sample indicates that Early Proterozoic light rare-earth element enriched lithosphere with a crustal history dating back to at least 2.45 Ga is present in the subsurface west of Wopmay Orogen.

scholarly journals Petrology of Peridotites and Nd-Sr Isotopic Composition of Their Clinopyroxenes from the Middle Andaman Ophiolite, India

Minerals ◽  
2018 ◽  
Vol 8 (9) ◽  
pp. 410 ◽  
Author(s):  
Tomoaki Morishita ◽  
Masako Yoshikawa ◽  
Akihiro Tamura ◽  
Juan Guotana ◽  
Biswajit Ghosh
Keyword(s):  
Rare Earth ◽  
Earth Element ◽  
Light Rare Earth ◽  
Andaman Island ◽  
Mantle Evolution ◽  
Ocean Ridges ◽  
Low Degree ◽  
Depleted Mantle ◽  
Mid Ocean Ridge ◽  
Ocean Ridge

The Andaman Ophiolite, India, is located at the southeastern end of the Tethyan ophiolites. We examine petrology and mineralogy of two lherzolites and a completely serpentinized dunite associated with lherzolite from the middle Andaman Island. Major and trace element compositions of minerals in the lherzolites suggest their residual origin after low-degree of partial melting with less flux infiltration, and are similar to those of abyssal peridotites recovered from mid-ocean ridges. The dunite with spinels having low-Cr/(Cr + Al) ratio was formed by interaction between peridotite and mid-ocean ridge basalt-like melt. The 87Sr/86Sr and 143Nd/144Nd isotopic systematics of clinopyroxenes of the two lherzolites are consistent with MORB-type mantle source. Petrology and light rare earth element (LREE)-depleted patterns of clinopyroxene from the studied lhezolites are the same as those from some of the western Tethyan ophiolites. The age-corrected initial εNd values of the Tethyan lherzolite clinopyroxenes with LREE-depleted patterns are likely to be consistent with the depleted mantle evolution line.

The geochemistry of the La Galissonnière Pluton: a Middle Proterozoic late-orogenic intrusion from the eastern Grenville Province, Quebec

1991 ◽  
Vol 28 (1) ◽  
pp. 37-43 ◽  
Author(s):  
James Bourne
Keyword(s):  
Rare Earth ◽  
Trace Element ◽  
Rare Earth Element ◽  
Earth Element ◽  
Light Rare Earth Element ◽  
Light Rare Earth ◽  
Grenville Province ◽  
Late Precambrian ◽  
Element Concentrations ◽  
Middle Proterozoic

The La Galissonnière Pluton is a late-orogenic pluton located in the eastern Grenville Province of Quebec. The pluton contains biotite > hornblende, zircon, titanite, allanite, and apatite, along with secondary sericite and epidote. The pluton features elevated values of Nb, Y, and F. The normalized rare-earth element patterns have light rare-earth element concentrations of 400–500× chondrite, moderate slopes (10–20), and noticeable Eu anomalies. Trace-element discriminant diagrams suggest that the pluton formed in a late-orogenic environment and indicate a possible period of late Precambrian crustal attenuation in the eastern Grenville Province.

The petrogenesis of metamorphosed carbonatites in the Grenville Province, Ontario

1997 ◽  
Vol 34 (9) ◽  
pp. 1185-1201 ◽  
Author(s):  
David P. Moecher ◽  
Eric D. Anderson ◽  
Claudia A. Cook ◽  
Klaus Mezger
Keyword(s):  
Rare Earth ◽  
Mantle Source ◽  
Earth Element ◽  
Minor Element ◽  
Geochemical Data ◽  
Boundary Zone ◽  
Grenville Province ◽  
Nd Isotope ◽  
Element Abundances ◽  
Depleted Mantle

Veins and dikes of calcite-rich rocks within the Central Metasedimentary Belt boundary zone (CMBbz) in the Grenville Province of Ontario have been interpreted to be true carbonatites or to be pseudocarbonatites derived from interaction of pegmatite melts and regional Grenville marble. The putative carbonatites have been metamorphosed and consist mainly of calcite, biotite, and apatite with lesser amounts of clinopyroxene, magnetite, allanite, zircon, titanite, cerite, celestite, and barite. The rocks have high P and rare earth element (REE) contents, and calcite in carbonatite has elevated Sr, Fe, and Mn contents relative to Grenville Supergroup marble and marble mélange. Values of δ18OSMOW (9.9–13.3‰) and δ13CPDB (−4.8 to −1.9‰) for calcite are also distinct from those for marble and most marble mélange. Titanites extracted from clinopyroxene–calcite–scapolite skarns formed by metasomatic interaction of carbonatites and silicate lithologies yield U–Pb ages of 1085 to 1035 Ma. Zircon from one carbonatite body yields a U–Pb age of 1089 ± 5 Ma; zircon ages from two other bodies are 1170 ± 3 and 1143 ± 8 Ma, suggesting several carbonatite formation events or remobilization of carbonatite during deformation and metamorphism around 1080 Ma. Values of εNd(T) are 1.7–3.2 for carbonatites, −1.5–1.0 for REE-rich granite dikes intruding the CMBbz, and 1.6–1.7 for marble. The mineralogy and geochemical data are consistent with derivation of the carbonatites from a depleted mantle source. Mixing calculations indicate that interaction of REE-rich pegmatites with regional marbles cannot reproduce selected major and minor element abundances, REE contents, and O and Nd isotope compositions of the carbonatites.

The effect of light rare earth element substitution in Yb14MnSb11on thermoelectric properties

2015 ◽  
Vol 3 (40) ◽  
pp. 10566-10573 ◽  
Author(s):  
Yufei Hu ◽  
Sabah K. Bux ◽  
Jason H. Grebenkemper ◽  
Susan M. Kauzlarich
Keyword(s):  
Rare Earth ◽  
Carrier Concentration ◽  
Thermoelectric Properties ◽  
Rare Earth Element ◽  
Earth Element ◽  
Light Rare Earth Element ◽  
Light Rare Earth ◽  
Element Substitution ◽  
Effect Of Light

ThezTof Yb14MnSb11is improved by the introduction of a light rare earth element, RE3+(RE = Pr, Sm) with partially filled f-levels. The carrier concentration is reduced upon substituting RE3+for Yb2+, adding one electron to the system and improving thezTvalues 30–40% over that of the pristine material.

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