Rare earth element pattern

Mitra, A. (1994) Geochemical implications of rare earth element pattern in hydrothermal fluids from midocean ridges. Geochim. Cosmochim. Acta, 58, 5105-5113. 

Rare earth elements patterns show differences in Eu anomalies for the samples studied from Boca del Tordo (Fig. 5) that can be attributed to the mix of felsic and mafic sources. This variation can also be explained due to the impoverishment of feldspars due to weathering (Kasper-Zubillaga etal. 2008b). Also Boca del... 

Nance WB, Taylor SR (1976) Rare earth element patterns and crustal evolution—I. Australian post-Archean sedimentary rocks. Geochim Cosmochim Acta 40 1539-1551 Nishio Y, Nakai S (2002) Accurate and precise lithium isotopic determinations of igneous rock samples using multi-collector inductively coupled plasma mass spectrometry. Anal Chim Acta 456 271-281 Nishio Y, Nakai S, Hirose K, Ishii T, Sano Y (2002) Li isotopic systematics of volcanic rocks in marginal basins. Geochim Cosmochim Acta 66 A556... 

JOHANNESSON, K.H., HAWKINS JR., D.L. Cortes, A., 2006. Do Archean chemical sediments record ancient seawater rare earth element patterns Geochimica et Cosmochmica Acta, 70, 871-890. 

Weathering-related rare earth element patterns in the regolith of the Cobar region, western New South Wales... 

Rare earth element patterns for basalt and chondrite, and the chondrite-normalized basalt REE pattern. Normalization removes the zigzag pattern due to differences in odd and even atomic number abundances. The europium (Eu) anomaly in the normalized pattern is due to incorporation of extra plagiodase. 

Figure 3, Chondrite-normalized rare earth element patterns of soapstone samples from quarries in the Mbe-marle-Nelson County regions of Virginia and in Crete. For the Albemarh-Nelson quarries f — the two lines give the range of 12 samples analyzed, and for the Crete samples (O — O) the two lines define the range of 19 samples. Two artifacts made of soapstone from the Albemarle-Nelson quarries are shown. One — M) is a pot from a habitation site in Cherokee County, NC and the other (A-- A) a pot from a habitation site near the quarry in Buckingham County, VA.

Figure 17 (a) Chondrite-normalized rare earth element patterns and (b) primitive-mantle normalized trace element... 

Lacan E. and Jeandel C. (2001) Tracing Papua New Guinea imprint on the central Equatorial Pacific Ocean using neodymium isotopic compositions and rare earth element patterns. Earth Planet. Sci. Lett. 186(3-4), 497-512. 

Elderfield H. and Greaves M.J., 1981, Neptive cerium anomalies in the rare earth element patterns of oceanic ferromanganese nodules. Earth Planet. Sci. Lett., 55, 163-170. 

Nance, W.B. and S.R. Taylor, 1976, Rare earth element patterns in Australian sedimentary rocks Geochim. Cosmochim. Acta 40, 1539. 

The REE pattern for fresh volcanic rocks in the Kuroko mine area studied by Dudas et al. (1983) is shown in Fig. 1.47 which shows no negative Ce and no positive Eu anomalies and FREE (Light Rare Earth Element) are not enriched compared with HREE... 

Moskalev, Yu.I., Zalinkin, G. A. and Stephanov, V. S. (1970). Distribution Patterns for Radioactive Rare-Earth Elements, Report No. ANL-Trans-832 (Argonne National Laboratory, Argonne, Illinois). 

ABSTRACT A geochemical analysis of major, trace and rare earth elements was carried out in beach sands collected from the Northeastern coast of Mexico in order to observe the spatial trends along three different beaches. Results show that major elements patterns along the beaches are controlled by heavy minerals and plutonic and sedimentary input towards the coast. In addition, trace elements tendencies indicate that the beach sands are influenced by the presence of magnetite. Finally, the differences in Eu anomalies indicate a mix of felsic to mafic and intermediate rocks and feldspar weathering. 

Two specific features determine the similarity and difference of energy levels in di- and trivalent ions of rare-earth elements. First, isoelectronic configurations of TR " and of the next elements in the periodic system determines a qualitatively similar pattern of terms and multiplet levels, namely for TR the order of the 4/ -configuration levels and of excited 4f 5d-configuration levels... 

Figure 6.6 Mass spectrum of rare earth elements tREEs) measured by CE-ICP-MS with on line separation of analytes (50 nl solution volume) a) natural isotopic pattern, concentration of each REE - 800ngg b) in an irradiated tantalum target (). S. Becker and H. ]. Dietze, Int. /. Mass Spectrom. Ion Proc. 197, 1-35 (2000). Reproduced by permission of the Royal Society of Chemistry.)...

As reported by Olmez and Gordon (University of Maryland), the concentration pattern of rare earth elements on fine airborne particles (less than 2.5 micrometers in diameter) is distorted from the crustal abundance pattern in areas influenced by emissions from oil-fired plants and refineries. The ratio of lanthanum (La) to samarium (Sm) is often greater than 20 (crustal ratio is less than 6). The unusual pattern apparently results from tlie distribution of rare earths in zeolite catalysts used in refining oil. Oil industry emissions have been found to perturb the rare earth pattern even in very remote locations, such as the Mauna Loa Observatory in Hawaii. 

To conclude this chapter, we discuss the shapes of the 4f orbitals as well as their splitting patterns in octahedral and tetrahedral crystal fields. The results are of use in studying the complexes of the rare-earth elements. 

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