Rare Earth Minerals and Resources in the World

Kanazawa, Yasuo; Kamitani, Masaharu

doi:10.1002/chin.200619221

Cited by 42 publications

(55 citation statements)

References 1 publication

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“…Because of coordination numbers and ionic radii considerations (Tables 1 and 2), all parent carbonates show a particularly similar REE signature (Haskin and Gehl, 1962;Reeder and America, 1983;Henderson, 1984), with an enrichment in LREEs over HREEs, a negative Ce-anomaly and no Euanomaly (Christie et al, 1998;Kanazawa and Kamitani, 2006). Parent carbonates that underwent diagenesis may exhibit MREE-enriched patterns (Lécuyer et al, 1998;Picard et al, 2002).…”

Section: Ree-bearing Minerals Abundant In Soils and Parent Materialsmentioning

confidence: 94%

“…Heavy minerals are known to host REEs, especially Zr-and Tibearing phases, such as anatase, ilmenite, sphene, rutile and zircon, which contain HREEs as "impurities" (Braun et al, 1990;Walter, 1991;Braun et al, 1998;Aubert et al, 2001;Aide and Pavich, 2002;Takahashi et al, 2003;Kanazawa and Kamitani, 2006). Since most of the heavy minerals are rather stable through weathering (Nickel, 1973), the REEs and especially HREEs included in these minerals are not expected to be highly mobilized during pedogenesis.…”

Section: Minerals With High Ree Concentrationsmentioning

confidence: 96%

“…Silicate primary minerals are non-negligible REE-bearing minerals (Kanazawa and Kamitani, 2006), despite a large variability among them. In the following, the association REE-silicate is ranked by increasing REE concentration.…”

Section: Ree-bearing Minerals Abundant In Soils and Parent Materialsmentioning

confidence: 99%

“…a decrease of ionic radius and an increase of electronegativity (Table 1), as well as a variation from 6 to 11 of their coordination numbers (Table 2; Henderson, 1984;Kanazawa and Kamitani, 2006). Two to three groups of REEs are generally distinguished: light REEs (LREEs), heavy REEs (HREEs) and sometimes middle or medium REEs (MREEs) (Henderson, 1984).…”

Section: Introductionmentioning

confidence: 98%

“…REEs occur in more than 200 minerals distributed in a wide variety of mineral classes (Henderson, 1984;Kanazawa and Kamitani, 2006), thus in most primary and secondary minerals in soils. Pedogenesis results from successive processes starting with primary mineral weathering that occurs in most if not all soils (Bockheim and Gennadiyev, 2000).…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

A review on the potentiality of Rare Earth Elements to trace pedogenetic processes

2009

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Section: Ree-bearing Minerals Abundant In Soils and Parent Materialsmentioning

confidence: 94%

Section: Minerals With High Ree Concentrationsmentioning

confidence: 96%

Section: Ree-bearing Minerals Abundant In Soils and Parent Materialsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

A review on the potentiality of Rare Earth Elements to trace pedogenetic processes

2009

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Rare earth element geochemistry during weathering of S‐type granites from dry to humid climates of Brazil

Silva

Nascimento

Biondi

et al. 2018

J. Plant Nutr. Soil Sci.

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S‐type granites are igneous rock types that are widespread in all continental crust. These granites play a key role in global weathering patterns and can be important economic ores of rare earth elements (REEs). This study provides insights into the geochemical and mineralogical signatures of REEs in S‐type granites and their derived soil profiles along a climosequence from dry to humid climates of Brazil. Mineralogical, petrographic, geochemical and soil analyses (physical and chemical) were used to evaluate the geochemistry of REEs in rock and soil samples. The granites were characterized as strongly peraluminous, being classified as typical S‐types. Both the granites and their derived soils contained high contents of REEs, with monazite and apatite being the major source of REEs. The high enrichment of light REEs (LRREs) in monazite and apatite explained the REE fractionation evidenced in the S‐type granites. The normalized REE distribution patterns for soil profiles along the climosequence revealed the fractionation between light and heavy REEs (HREEs). The ratio of La/YbN > 1 also confirmed the LREEs/HREEs fractionation. The mineralogical composition of the parent material and the clay minerals (kaolintes) seemed to govern the fractionation between LREEs and HREEs in these soils. Chemical index of alteration (CIA) values, REE fractionation and kaolinite proportions in soil profiles increased from dry to humid climates. These results suggest that the degree of weathering plays an important role in the type and volume of secondary minerals, as well as the REE fractionation. Among the phyllosilicates, kaolinite seems to be the most important adsorbent of light REE. The higher positive Eu anomalies with advanced weathering are explained by the breakdown of plagioclase. The weathering of monazite and apatite was the main reason for the slight negative Ce anomalies in the soil profiles. This study can be used to comprehend the geochemistry of REEs in other parts of the tropics underlain by S‐type granites.

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Distribution of rare earth elements (REEs) and their roles in plant growth: A review

Yue

Shen

Feng

et al. 2022

Environmental Pollution

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Rare Earth Minerals and Resources in the World

Abstract: ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.

Cited by 42 publications

References 1 publication

A review on the potentiality of Rare Earth Elements to trace pedogenetic processes

A review on the potentiality of Rare Earth Elements to trace pedogenetic processes

Rare earth element geochemistry during weathering of S‐type granites from dry to humid climates of Brazil

Distribution of rare earth elements (REEs) and their roles in plant growth: A review

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