Disentangling the influence of lithology and non-provenance factors on the geochemistry of rare earth elements: a study of fine-grained sediments from the Sava River headwaters (Slovenia, Croatia)

2021 ◽  
Author(s):  
Mavro Lučić ◽  
Neda Vdović ◽  
Niko Bačić ◽  
Nevenka Mikac ◽  
Pedro Dinis
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Fine Grained ◽  
Sava River ◽  
The Sava River

scholarly journals Geochemistry of Garga-Sarali intrusive granitoids (central domain of the central African fold belt in Cameroon): petrological implication

2020 ◽  
Vol 8 (1) ◽  
pp. 33
Author(s):  
Daama Isaac ◽  
Mbowou Gbambie Isaac Bertrand ◽  
Yamgouot Ngounouno Fadimatou ◽  
Ntoumbe Mama ◽  
Ngounouno Ismaïla
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Partial Melting ◽  
Fractional Crystallization ◽  
Coarse Grained ◽  
Geochemical Analysis ◽  
Fold Belt ◽  
Volcanic Arcs ◽  
Fine Grained ◽  
Incompatible Elements

The Garga-Sarali granitoids outcrop in form of large slabs and undistorted large blocks, into a schisto-gneissic basement. These rocks contain mainly muscovite and microcline, followed by K-feldspar, quartz, biotite, pyroxene, zircon and oxides, with coarse-grained to fine-grained textures. Geochemical analysis show that it belongs to differentiated rocks group (granodiorite-granite) with high SiO2 (up to 72 wt%) contents. Their genesis was made from a process of partial melting and fractional crystallization. These rocks are classified as belonging to I- and S-Type, meta-peraluminous, shoshonitic granites; belonging to the domain of volcanic arcs. The rare earth elements patterns suggest a source enriched of incompatible elements. The Nb-Ta and Ti negative anomalies from the multi-element patterns are characteristics of the subduction domains.  

Use of element-mineral correlations to investigate fractionation of rare earth elements in fine-grained sediments

1994 ◽  
Vol 58 (393) ◽  
pp. 533-541 ◽  
Author(s):  
J. T. Temple ◽  
J. N. Walsh
Keyword(s):  
Rare Earth ◽  
Correlation Analysis ◽  
Rare Earth Elements ◽  
Partial Correlation ◽  
Correlation Coefficients ◽  
Partial Correlation Analysis ◽  
Middle Ordovician ◽  
Fine Grained ◽  
South Wales

AbstractRelative concentrations of elements in the minerals of fine-grained sediments can be inferred from element-mineral correlation coefficients. The technique is applied to the distribution of REE in Middle Ordovician shales from South Wales analysed by ICPAES, Leco C/S125 and XRD. Phosphate and chlorite show mid-REE enrichment; muscovite + biotite shows mid-REE depletion. The complementarity of the chlorite and muscovite + biotite patterns may be due to fractionation during diagenetic recrystallisation. Partial correlation analysis is used to infer the presence of zircon.

scholarly journals Petrografia, Geoquímica, Análises Isotópicas (Sr, Nd) e Geocronologia Ar-Ar dos Basaltos de Tapirapuã (Tangará da Serra, Mato Grosso, Brasil)

2006 ◽  
Vol 33 (2) ◽  
pp. 71 ◽  
Author(s):  
MÁRCIA APARECIDA DE SANT’ANA BARROS ◽  
ANA MARIA MIZUSAKI ◽  
RICARDO WESKA ◽  
ANDRÉ DE BORBA ◽  
FARID CHEMALE JR ◽  
...  
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
North Atlantic ◽  
Volcanic Event ◽  
Mato Grosso ◽  
Fine Grained ◽  
The North ◽  
Tectonic Environment ◽  
Heavy Rare Earth Elements ◽  
Light Rare Earth Elements

 The basaltic flows from Tapirapuã Formation are exposed at Tangará da Serra region, 250 km from Cuiabá (MT) and the thickness can reach 310 meters. The basalts range from massive dark gray, with colunar disjunctions at the base to purple amygdaloidal at the top. They are generally fine-grained, however gabroics portions have been identified. In thin section the Tapirapuã basalts show subophitic texture. Chemical analyses in these rocks suggest tholeiitic compositions, within continental tectonic environment. There is an enrichment of light rare earth elements when compared to heavy rare earth elements. The studied samples have low contents of TiO2 and P2O5 being similar to low P2O5 and TiO2 group from Serra Geral Formation (Paraná Basin). Analyses of Sr and Nd isotopes show the following results: 87Sr/86Sr between 0.703 and 0.707, ∈Nd from –0.01 to + 2.32 and model ages (TDM)= (931 to 1.267 Ma). 40Ar / 39Ar geochronology of plagioclase crystals from Tapirapuã basalts presented a plateau age of 206 ± 6 Ma, in agreement with previous ages obtained from Anari and Tapirapuã sub-provinces. This result places the volcanic event at the limit of the Triassic-Jurassic periods, related to the opening of the North Atlantic.

scholarly journals Trace and Rare Earth Elements Compositional Change on Andesite Alteration in Kaligesing, Purworejo

2020 ◽  
Vol 21 (1) ◽  
pp. 17
Author(s):  
Joko Subandrio ◽  
Ronaldo Irzon
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Hydrothermal Alteration ◽  
Inductively Coupled Plasma ◽  
Microscopic Analysis ◽  
Inductively Coupled ◽  
Fine Grained ◽  
Central Java ◽  
Eu Anomaly ◽  
Plasma Mass Spectrometry

The change of chemical composition because of hydrothermal alteration process is related to the modification on mineralogy and elements mobility. Different alteration conditions could lead to dissimilar geochemical character. This study aims to discuss the alteration effect on trace and rare earth elements composition of an andesite outcrop with hydrothermal alteration in Kaligesing, Purworejo, Central Java Province. Microscopic analysis at Central for Geological Survey was applied to determine the modal mineral composition of the selected samples whilst trace and rare earth elements abundances was measured using Inductively Coupled Plasma – Mass Spectrometry. Plagioclase is the major phenocryst embedded in the fine-grained feldspar and glass groundmass of relatively fresh andesite. On the other hand, sericite, chlorite, epidote, and iron oxide are detected in the altered rock. The more Sr and Rb compositions on unaltered sample exhibit their common existence in plagioclase. The bigger Rb/Sr and the lower Ba/Sr ratios inward to the center of alteration might indicate the more degree of K-bearing mineral formation than Ca-rich mineral alteration. The Ba/Zr escalation and Zr/Y reduction from relatively fresh rock through to the vein of the studied samples are parallel to the previous investigation about andesite alteration. Chondrite-normalized rare-earth elements (REE) pattern of unaltered, altered, and vein samples depicts similar patterns: strong enrichment of Low REE, positive Eu anomaly, and relatively flat high REE. The decrease of Eu anomaly may reflect the reduction of plagioclase modal composition because of alteration and might indicate a reductive alteration state.Keywords: Alteration, andesite, geochemistry, trace and rare earth elements.

Geochemical investigation of an unusual alteration profile developed at the base of a Carboniferous lava flow, Isle of Bute, Scotland

2008 ◽  
Vol 99 (2) ◽  
pp. 49-59 ◽  
Author(s):  
Grant M. Young
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Lava Flow ◽  
Volcanic Rocks ◽  
Atomic Weight ◽  
Alteration Zone ◽  
Fine Grained ◽  
Heavy Rare Earth Elements ◽  
Chemical Index Of Alteration ◽  
Geochemical Investigation

ABSTRACTAn alteration zone at the base of a Carboniferous lava flow on the island of Bute resembles modern and ancient weathering profiles, but it is ‘upside down’ in the sense that alteration is most intense at the base and decreases upwards. Values for a Chemical Index of Alteration (CIA) increase from fresh lava and corestones downwards to fine-grained structureless material. The altered material is Mg- and Cu-rich, possibly as a result of migration of these elements from underlying sediments. Rare earth elements (REE) display considerable and systematic mobility and fractionation. In general heavy rare earth elements (HREE) are concentrated during alteration, whereas the light rare earth elements (LREE) are lost. Mobility of the REE appears to be related to atomic weight, with La (the lightest REE) being the most depleted through to Lu, which is the most concentrated REE in the highly altered material. Similar systematic fractionation is shown by some weathering profiles developed on mafic igneous rocks. Movement of water into the volcanic rocks was probably driven by a steep thermal gradient between the hot lava and its sedimentary substrate.

The Effect of Modification with Rare Earth Elements on ZnAl22Cu3 Alloy Structure And Mechanical Properties / Wpływ Modyfikacji Pierwiastkami Ziem Rzadkich Na Strukture I Własciwosci Mechaniczne Stopu ZnAl22Cu3

2013 ◽  
Vol 58 (1) ◽  
pp. 49-53 ◽  
Author(s):  
R. Michalik
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Rare Earth ◽  
Rare Earth Elements ◽  
Dendritic Structure ◽  
Alloy Structure ◽  
Melt Strength ◽  
Fine Grained

The influence of modification with rare earth elements (RE) on the structure and mechanical properties of alloy ZnAl22Cu3 is presented in the paper. ZnAl22Cu3, ZnAl22Cu3SiM and ZnAl22Cu3Si (modified alloy) alloys were tested. ZnAl22Cu3Si and ZnAl22Cu3 alloys were characterized with heterogeneous, fine-grained, dendritic structure. The structure of the alloy ZnAl22Cu3SiM was much more homogeneous. It was found that the addition of silicon reduces the tensile strength. Addition of rare earth elements to the alloy with silicon resulted in the re-growth of melt strength of alloy. It was also found that the modification performed by using of rare earth elements increases the hardness of the alloy.

The geochemistry of the carbonate-rich Espanola Formation (Huronian) with emphasis on the rare earth elements

1979 ◽  
Vol 16 (2) ◽  
pp. 230-239 ◽  
Author(s):  
Scott M. McLennan ◽  
B. J. Fryer ◽  
Grant M. Young
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Manganese Nodule ◽  
Nodule Formation ◽  
Fine Grained ◽  
Clastic Rocks ◽  
Lower Proterozoic ◽  
Fe And Mn ◽  
High Concentrations ◽  
The Rare Earth

The Espanola Formation, part of the Lower Proterozoic Huronian sequence, is unique in the Huronian succession in that it contains abundant carbonate material.Chemical analysis of bulk samples suggest that the dominant control on the distribution of Al, Si, Ti, K, P, Rb, Zr, Ba, Zn, Cr, Ni, Li, and Ga is the noncarbonate fraction of the rocks. This terrigenous component was derived from a source compositionally similar to that of other fine-grained Huronian formations. Sr is controlled by the substitution for Ca in calcite and dolomite. Na and Y are strongly affected by both the carbonate and noncarbonate fraction. Cu displays erratic behaviour. Microprobe analyses reveal high concentrations of Fe in calcite and dolomite, possibly related to substitution for Mg. Mn may have had a similar control. Whether this control is related to incorporation of Fe and Mn at the time of deposition, during diagenesis, or during metamorphism is uncertain.The distribution of the rare earth elements is similar to that of normal terrigenous clastic rocks of post-Archean age. However, high concentrations of REE in the soluble portion of carbonate-rich samples may suggest incorporation of REE into the carbonate structure. The lack of anomalous Ce behaviour implies that these rocks were deposited in water not equilibrated with manganese nodule formation.

Rare earth elements in fine-grained sediments of major rivers from the high-standing island of Taiwan

2013 ◽  
Vol 69 ◽  
pp. 39-47 ◽  
Author(s):  
Chuan-Shun Li ◽  
Xue-Fa Shi ◽  
Shuh-Ji Kao ◽  
Yan-Guang Liu ◽  
Hua-Hua Lyu ◽  
...  
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Fine Grained
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