rare earth peridotite

Mantle Evolution from Ocean to Arc: The Record in Spinel ...

A suite of peridotite xenoliths were collected from lahar flow deposits located close to the summit of Mt. Pinatubo. Spinel harzburgite is the most dominant lithology among dunites, pyroxenites and websterites. A rare spinel lherzolite xenolith (P12-7) is also present in this suite. The spinel lherzolite has well-preserved protogranular texture with very minimal presence of secondary amphibole ...

Geochemical and Petrological Characterizations of ...

Peridotite, (3) Yellowdog Peridotite, and (4) Black Rock Point Gabbro. Analyses were conducted to determine if any petrological or geochemical relationships exist between ... Rare earth element spider plot. After McDonough and Sun (1995). ..... 84 42. Visual explanation of …

Behavior of Rare Earth Elements and High-Field Strength ...

Serpentinized abyssal peridotites are evidence for active communication between the Earth's hydrosphere and the upper mantle, where exchange and retention of both major and trace elements occur. Rare earth elements (REE) and high-field strength elements (HFSE: Ti, Zr, Hf, Nb, Ta) are generally thought of as immobile during serpentinization.

SEPARATION OF IRON FROM RARE-EARTH ELEMENTS

Optimal conditions were found for separation of microamounts of REE (rare earth elements) from large amounts of Fe, Al, Mg, Ca, and other elements. A procedure is suggested for REE concentration from a number of rocks: earth and moon basalt and anortosite, peridotite, and iron minerals.

Probing Archean lithosphere using the Lu^Hf isotope ...

Probing Archean lithosphere using the Lu^Hf isotope systematics of peridotite xenoliths from Somerset Island kimberlites, Canada Stefanie S. Schmidbergera ; b, Antonio Simonetti, Don Francisa, Cle¤ment Garie¤pyb a Earth and Planetary Sciences, McGill University, 3450 University Street, Montre¤al, QC, Canada H3A 2A7 b GEOTOP, Universite ¤du Quebec a' Montreal, P.O. Box 8888, succ.

Peridotite: Igneous Rock - Pictures, Definition & More

A rare-earth element (REE) or rare-earth metal (REM), as defined by the International Union of Pure and Applied Chemistry, is one of a set of seventeen chemical elements in the periodic table, specifically the fifteen lanthanides, as well as scandium and yttrium.

Re Os evidence for the age and origin of peridotites from ...

Re–Os evidence for the age and origin of peridotites from the Dabie–Sulu ultrahigh pressure metamorphic belt, China Honglin Yuana,b, Shan Gaoa,b,⁎, Roberta L. Rudnickc, Zhenmin Jinb, Yongsheng Liub, Igor S. Puchtelc, Richard J. Walkerc, Ridong Yub a State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi'an, 710069, China

The Rare Earth Content and Origin of Alkali-Rich Basalts ...

The rare earth content of alkali-rich, silica-undersaturated basalts erupted onto oceanic and continental plates is consistent with their derivation by slight amounts of partial melting of hydrous garnet peridotite at the top of the asthenosphere, within the low-velocity, low-Q zone of the mantle.

Dissakisite-(la)" (mg-analogue of allanite) in peridotite ...

Dissakisite-(Ce), ideally CeCaMgAl_2Si_3O12(OH), is a rare (REE, Mg)-rich member of the epidote group. To date, only two occurrences of dissakisite in peridotite have been reported. The first was described in garnet peridotites from the Su-Lu

Ultrapotassic Ma˜c Dikes and Rare Earth Element- and ...

"The rare earths perplex us in our researches, baffle us in our speculations, and haunt us in our very dreams. They stretch ... This depleted peridotite subsequently was infiltrated by and reacted with magmas or aqueous fluids that produced vein and metasomatic minerals such as phlogopite, alkali amphibole, clinopyroxene, ...

Rare earth pegmatites in carbonatites, Journal of African ...

 · Read "Rare earth pegmatites in carbonatites, Journal of African Earth Sciences" on DeepDyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips.

The composition of peridotites and their minerals: a laser ...

in peridotite xenoliths 16 . One is a fertile lherzolitewx .2905, which has lost only a small amount of melt .i.e., it has 3.1% Al O and 2.8% CaO and retains a 23 light rare-earth element LREE depletion, whereas . the other is a refractory harzburgite 84-402 with a . depleted major-element composition 1.3% Al O 23

Rare earths in peridotite nodules: An explanation of the ...

Rare earth abundances in peridotite (lherzolite) nodules and mineral fractions separated from them were measures by neutron activation analysis. Rare earths in a possible liquid phase which could have equilibrated with the nodules were calculated on the basis of trace element partition.

Anomalous Isotopes and Trace Element Zoning in Plagioclase ...

and rare earth element (REE) data [3] we show that the plagioclase in these xenoliths was not part of the residual mineralogy but was later introduced into the lithosphere by melts derived from the Koolau plume. Based on our present analysis, we feel that the δF/ δP at 0.7 GPa in …

Geochemistry of peridotite xenoliths in basalt from ...

Based on geochemical studies of six anhydrous spinel peridotite xenoliths in basanite, the upper mantle beneath Hannuoba, eastern China is compositionally heterogeneous. These samples range in Sr and Nd isotopic ratios from MORB-like to near bulk-earth estimates. The low {sup 87}Sr/{sup 86}Sr and ...

Mechanisms and sources of mantle metasomatism: Major and ...

Mineral and whole-rock chemical data for peridotite xenoliths in basaltic lavas on Spitsbergen are examined to reassess mechanisms of melt-fluid interaction with peridotites and their relative role versus melt composition in mantle metasomatism.

Rare-Earth abundances in some ultramafic rocks - Frey ...

A survey has been made of the abundances of the rare earths (REE) in ultramafic rocks. Samples analyzed were taken from alpine regions, layered intrusions, basaltic nodules, and kimberlite pipes. A wide range of REE concentrations and relative abundances was found.

Xenoliths / Xenocrysts - Earth Sci

A peridotite xenolith in a basaltic lava flow, for instance, means a chunk of the rock peridotite is embedded in basalt rock. The peridotite is usually yellow and dense, while the basalt is usually grey and light. Xenoliths and xenocrysts provide valuable information about the geology of the Earths mantle.

Anomalous isotopes and trace element zoning in plagioclase ...

Survival of plagioclase in the residual melting column during melting can have a significant impact on the melting process beneath a mid-oceanic ridge [Asimow et al., Phil. Trans. R. Soc. London Ser. A 355 (1997) 255-281]. Here we investigate the origin of plagioclase that occurs in some rare mantle xenoliths from Oahu, Hawaii.

Formation of carbonatite-related giant rare-earth-element ...

 · Rare-earth elements (REEs) are essential for high-technology industries and crucial defense systems. China hosts one-third of the known REE reserves and produces 97% of the REE + Y 1 in the world. A wide variety of REE deposits are found in China 2,3, among which the carbonatite-associated REE deposits (CARDs), formed by REE-rich fluids exsolved from carbonatitic melts, are …

Rare earth elements in alpine peridotites | SpringerLink

Abstract. The samples from alpine peridotite massifs (Beni Bouchera, Lherz and the Alps) have been analyzed for rare earth elements. The peridotites as a whole are characterized by various degrees of light REE depletion (Ce varies from 1.2 to 0.02 times chondrite) and a small variation in heavy REE (Yb varies about a factor of 2, from 1.3 to 2.2 times chondrite).

Komatiite - Wikipedia

Komatiite (/ k oʊ ˈ m ɑː t i. aɪ t /) is a type of ultramafic mantle-derived volcanic rock defined as having crystallised from a lava with ≥ 18 wt% MgO.Komatiites have low silicon, potassium and aluminium, and high to extremely high magnesium content. Komatiite was named for its type locality along the Komati River in South Africa, and frequently displays spinifex texture composed of ...

Rocks and Minerals, Kentucky Geological Survey, University ...

Peridotites formed deep in the earth near the mantle under high temperature and pressure, and were thrust explosively toward the surface where they intruded into the host rocks. Peridotite consists in part of the minerals olivine and pyroxene. The Elliott County peridotite is a special type of peridotite …

Elements Found in Meteorites & Meteors | Sciencing

For example, scientists found oldhamite in a meteorite they recovered in California. Oldhamite is a calcium sulfide that you rarely find on Earth. In 1948, hundreds of meteorites fell over Colorado, Nebraska and Kansas. One of the largest meteorites was a rare type called enstatite achondrite.

Peridotite Research Papers - Academia.edu

The effects of melting in an open-system scenario are here explored looking to the rare earth element (REE) distribution in mantle residues. We consider a peridotite matrix equilibrated in the spinel field accounting for melt inflow during partial melting.

Mantle Evolution from Ocean to Arc: The Record in Spinel ...

Arc-derived peridotite xenoliths are relatively rare compared to mantle peridotite samples from other tectonic settings [18,63]. In the Philippines, spinel harzburgite was the main type of xenolith in Mt. Iraya in Batan island [4,14,15,18,22]. Though very rare in occurrence, the lone spinel lherzolite xenolith in our sample suite is a very ...

(PDF) Distribution of titanium and the rare earth elements ...

The concentrations of titanium and rare earth elements (REE) in olivines, orthopyroxenes, clinopyroxenes and spinels from four anhydrous, spinel-bearing peridotite …

Rare-earth element geochemistry and the origin of ...

Rare-earth abundances for both basalts and andesites are particularly enriched in light rare-earth elements. High-Al basalts are more enriched than the "low-Al" basalt and have values comparable to the andesites. Labradorite and labradorite-pyroxene andesites all have negative Eu anomalies and hornblende andesites all have negative Ce anomalies.

Chemical composition of Earth's primitive mantle and its ...

Chemical composition of Earth's primitive mantle and its variance: 1. Method and results ... rare earth elements (REE), U, and Th, occur in roughly constant proportions in different classes of chondrites and also in the solar photosphere [Wasson and Kallemeyn, 1988; Lodders and Fegley, ... peridotite samples, which come from depths of less than

Partitioning of rare earth elements between phosphate-rich ...

Migration Geochemistry Rare Earth Earth Element Mantle Peridotite These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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