SEIXOS DE FOSFATOS-SULFATOS DOS MINERAIS DO SUPERGRUPO ALUNITA NOS ALUVIÕES DIAMANTÍFEROS DE PAININN ÀS MARGENS DO TAPAJÓS EM ITAITUBA (PARÁ): GOYAZITA-FLORENCITA-GORCEIXITA-CRANDALLITA-ESVANBERGITA/WOODHOUSEITA

2021 ◽  
Vol 8 (2021) (2) ◽  
pp. 1-11
Author(s):  
Marcondes Costa ◽  
◽  
Marcus Brito ◽  
Mário Chaves ◽  
Herbert Pöllmann ◽  
...  
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Trace Element ◽  
Chemical Nature ◽  
Aluminum Phosphate ◽  
Light Rare Earth ◽  
The Right ◽  
Light Rare Earth Elements

The diamond alluvium gravels from the Painin garimpos, on the right bank of the Tapajós River, in Itaituba, Pará, stand out for the marked presence of pebbles from <1 cm to about 10 cm in diameter consisting of aluminum phosphate-sulfates (APS minerals) from the alunite supergroup: goyazite-florencite-gorceixite-crandallite-esvanbergite/woodhouseite. They are light gray pebbles, still containing small amounts of pyrite, kaolinite, goethite and anatase. The total chemical and trace element analyzes confirm the indicated mineralogical constitution alongside the XRD. The florencite member is mainly dominated by Ce, La, Nd and Sm, the light rare earth elements, and also contains anomalous concentrations of Nb, Y, Pb, U and Th. This chemical nature of these pebbles, in part, makes it possible to compare them with the diamond satellite beans (favas) in secondary deposits in Brazil, but chemically only with the phosphates from Malawi and Sayan.

Significance of the metasomatized lithospheric mantle in the formation of early basalts and Cu – platinum group element sulfide mineralization in the Coldwell Complex, Midcontinent Rift, Canada

2019 ◽  
Vol 56 (7) ◽  
pp. 693-714 ◽  
Author(s):  
David J. Good ◽  
Peter C. Lightfoot
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Trace Element ◽  
Lithospheric Mantle ◽  
Group Element ◽  
Light Rare Earth ◽  
Midcontinent Rift ◽  
Northern Margin ◽  
Lithospheric Mantle Source ◽  
Light Rare Earth Elements

A diverse suite of tholeiitic to alkaline basalt and gabbroic intrusions located in the Coldwell Complex on the northern margin of the Midcontinent Rift exhibit unusual trace element signatures that show enriched large ion lithophile elements and light rare earth elements with negative Nb and Zr anomalies. These features are not typical of magmas derived by partial melting within or above a rising mantle plume, as might be expected in an early Midcontinent Rift magmatic event. In this paper, we provide a detailed geochemical study of a 500 m thick sequence of metabasalt that represents the earliest stage of magmatism in the Coldwell Complex. We show that contamination or crystallization processes or subsequent metasomatism cannot explain the trace element variations. Instead, we propose partial melting in a metasomatized Subcontinental Lithospheric Mantle source to explain the decoupled behavior of large ion lithophile elements from light rare earth elements and heavy rare earth elements and rare earth elements from high field strength elements and the enriched Nd isotope signature of metabasalt. Similar features occur in unit 5b of the Mamainse Point Volcanic Group located at the northern margin of the Rift. An objective of this paper is to relate Two Duck Lake gabbro, host rock for low-sulfur, high precious metal sulfide mineralization at the Marathon deposit, to the metabasalt sequence. The excellent match of trace element abundances in Two Duck Lake gabbro to metabasalt unit 3 confirms an early Coldwell Complex age for metabasalt and a Subcontinental Lithospheric Mantle source for Cu – platinum group element mineralized gabbros.

Minor and trace element chemistry of carbonates, apatites and magnetites in some African carbonatites

1996 ◽  
Vol 60 (400) ◽  
pp. 415-425 ◽  
Author(s):  
J. B. Dawson ◽  
I. M. Steele ◽  
J. V. Smith ◽  
M. L. Rivers
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Trace Element ◽  
Light Rare Earth ◽  
Trace Element Chemistry ◽  
Element Chemistry ◽  
Fe And Mn ◽  
Ppm Level ◽  
Light Rare Earth Elements ◽  
Cu And Zn

AbstractIn calcites and dolomites in seven African carbonatites, SrO, FeO and MnO occur in concentrations from 1 to 2 wt.%, whereas Ce, Y, Cu and Zn occur only at the ppm level. Sr, Ce and Y partition preferentially into calcite relative to co-existing dolomite, whereas Fe and Mn favour dolomite. Sr partitions preferentially into calcite relative to co-exisiting apatite, but the light rare-earth elements partition into apatite. Magnetite from Kerimasi contains up to 13 wt.% MgO and 6 wt.% MnO, extending the known ranges in composition of magnetites from carbonatites.

Depletion of light rare-earth elements in felsic magmas

Geology ◽  
1982 ◽  
Vol 10 (3) ◽  
pp. 129 ◽  
Author(s):  
Calvin F. Miller ◽  
David W. Mittlefehldt
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Light Rare Earth ◽  
Light Rare Earth Elements

Recycling and substitution of light rare earth elements, cerium, lanthanum, neodymium, and praseodymium from end-of-life applications - A review

2019 ◽  
Vol 236 ◽  
pp. 117573 ◽  
Author(s):  
Linda Omodara ◽  
Satu Pitkäaho ◽  
Esa-Matti Turpeinen ◽  
Paula Saavalainen ◽  
Kati Oravisjärvi ◽  
...  
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
End Of Life ◽  
Light Rare Earth ◽  
Light Rare Earth Elements

scholarly journals Geochemical Characteristics of Dolomitic Phosphorite Containing Rare Earth Elements and Its Weathered Ore

Minerals ◽  
2019 ◽  
Vol 9 (7) ◽  
pp. 416 ◽  
Author(s):  
Shuai Li ◽  
Jie Zhang ◽  
Huaifa Wang ◽  
Caili Wang
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Test Method ◽  
Isomorphic Substitution ◽  
Leaching Test ◽  
Light Rare Earth ◽  
Marine Sedimentation ◽  
Mineralogical Characteristics ◽  
Development And Utilization ◽  
Light Rare Earth Elements

In order to provide a good theoretical guidance for the development and utilization of weathered phosphorite resources, we investigated the geochemical and mineralogical characteristics of primary and weathered phosphorites. The analysis of trace elements showed that the primary ore has hydrothermal sedimentation effect in the later stage, the weathered ore has obvious residual enrichment and the phosphate ore belongs to clastic lithologic phosphate rock. In addition, through leaching test method, it was shown that rare earth elements are present in fluorapatite in the form of isomorphic substitution, and the proportion of rare earth elements adsorbed on clay and other minerals was likely to be between 2% and 3%. The light rare earth elements are relatively enriched in both primary and weathered phosphorite, and Ce and Eu have obvious negative anomalies. The primary phosphorite is a dolomitic phosphorite containing rare earth elements, which are naturally enriched by weathering, and its weathered ore has obvious residual enrichment, while the deposit was characterized by normal marine sedimentation and hydrothermal action.

Adsorption/desorption Behaviors of Light Rare Earth Elements (Ce and Nd) using Lewatit VP OC 1026

2015 ◽  
Vol 52 (4) ◽  
pp. 353-363
Author(s):  
Won Geun Lee ◽  
Joung Woon Kim ◽  
Sungeun Lee ◽  
Insung Hwang ◽  
Hong Myeong Jeon ◽  
...  
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Light Rare Earth ◽  
Adsorption Desorption ◽  
Light Rare Earth Elements
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