Y-Ho fractionation and lanthanide tetrad effect observed in cherts.

Minami, Masayo; Masuda, Akimasa; Takahashi, Kazuya; Adachi, Mamoru; Shmizu, Hiroshi

doi:10.2343/geochemj.32.405

Cited by 26 publications

(20 citation statements)

References 31 publications

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“…(2)) between REE(III) complexes in seawater (Kawabe et al, 1998), 3 ) parameters for 4f electron repulsion in REE 3+ , the logarithms of concentration ratios between the pair of species show a REE fractionation trend characterized by tetrad effect (Jørgensen, 1979;Kawabe, 1992;Minami et al, 1998;Kawabe and Masuda, 2001). In fact Racah E 1 and E 3 parameters for REE sesquioxide (REEO 1.5 ) and REE(OH) 3 are significantly smaller than those for REECO 3 + (aq) and slightly smaller than those of REE(CO 3 ) 2 -(aq) in seawater solution (Ohta and Kawabe, 2000).…”

Section: Tetrad Character and Nature Of Ree Abundancesmentioning

confidence: 99%

Characteristics of rare earth element abundances in shallow marine continental platform carbonates of Late Neoproterozoic successions from India.

et al. 2003

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We have studied the REE distribution in shallow marine continental platform carbonates belonging to two late Neoproterozoic basins of India. Their REE abundance patterns normalized by chondrite display well defined W-type tetrad effect. Based on chondrite-normalized Gd/Ho, La/Nd ratios, the REE abundance patterns have been classified into three groups. (Y/Ho) and (Y/Dy) concentration ratios reflect a combined effect of Y fractionation relative to neighboring trivalent REEs during carbonate precipitation from seawater and influence of continental contributions with chondritic ratios. Negative Ce anomalies recorded in Krol and Bilara carbonates resembles the Ce anomaly reported from shallow marine waters. However, absence of Ce anomaly and distinct positive anomalies in some of our carbonate samples reflect post-depositional redox condition related to Ce mobilization and preferential enrichment during early diagenesis. Variations in the REE abundance patterns may be attributed to contamination with terrigenous particulates having shale like REE abundances and post-depositional early diagenetic processes.

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Section: Tetrad Character and Nature Of Ree Abundancesmentioning

confidence: 99%

Characteristics of rare earth element abundances in shallow marine continental platform carbonates of Late Neoproterozoic successions from India.

et al. 2003

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“…In addition, recent studies indicate that concave form of the tetrad effect phenomenon can be attributed to distribution of REE in seawaters, diagenetic processes, and REEcomplexation (Minami et al, 1998;Cunha et al, 2012). Based on the current and previous data in this district, it can be deduced that the shallow marine depositional environment, diagenetic processes, and redistribution of REE by complexing ligand such as polycarbonates are likely some other mechanisms for deposition and distribution of REE and tetrad effect in the limestone.…”

Section: Lanthanide Tetrad Effect In Limestone: a Tool To Environmentmentioning

confidence: 67%

“…Moreover, fraction between these isovalent pairs due to different surface complex stabilities and rapid scavenging of Ho by Fe-and/or Mn-(hydro-) oxides lead seawaters to have Y/Ho atios of 50-60 (Koschinsky et al, 1997;Minami et al, 1998;Madhavaraju et al, 2010). Previous studies shown that the Y/Ho ratio rapidly decreases in marine deposits due to input of terrigenous source particles (i.e., felsic and basaltic composition) into sedimentary environment (Bau et al, 1996;Webb and Kamber, 2000;Bolhar et al, 2004).…”

Section: Ree Distribution and Geochemical Parametersmentioning

confidence: 99%

Lanthanide tetrad effect in limestone: a tool to environment analysis of the Ruteh Formation, NW Iran.

Abedini¹

2018

Acta Geodynamica Et Geomaterialia

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Exhibition of lanthanide tetrad effect in PAAS-normalized REE patterns, and non-CHARAC (non-CHArge-RAdius Control) behavior of Y/Ho and Zr/Hf in limestone of the Ruteh Formation, Kanigorgeh district (NW Iran), were studied in order to understand the reasons of occurrence of lanthanides tetrad effects. The computed values show that the third and fourth tetrads can be used as a good and powerful geochemical tool for investigation of physicochemical conditions of the depositional environment of the limestones. Here, a new mathematical-based method using polar coordination system for tetrad effect values (T p ) was used to evaluate under studying limestone. The correlation between T p and some geochemical parameters revealed that the limestone was likely deposited under two different conditions. The obtained results indicated that paleo-redox conditions, adsorption and scavenging by kaolinite and metallic oxides, degree of detrital input, diagenesis intensity, and complexation by polycarbonate ligands are likely the main mechanisms for occurrence of tetrad effect phenomenon in REE distribution patterns in the limestone. This means that tetrad effect phenomenon in REE distribution patterns of limestone can be applied as a good geochemical indicator to evaluate the deposition conditions in limestones. ARTICLE INFO

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“…Irber (1999) and Lee et al (1994), respectively, and (b) garnets in sample 34-4 of the Xingzi Group and in the leucogranitic gneiss (3188GT) after Lee et al (1994), also shown are the garnets in the wallrocks (samples 34-7 and 35) Anders and Grevesse (1989). Akagi, 1989;Bau, 1996;Irber, 1999), limestones (Kawabe et al, 1991), uraninites (Hidaka et al, 1992), Quaternary sediments (Liu et al, 1993), kimuraite (Akagi et al, 1993), leucogranitic gneiss (Lee et al, 1994), and cherts (Minami et al, 1998). Although some geochemists have argued against its existence in natural environments (e.g., McLennan, 1994) and attributed the anomalous REE patterns in some leucogranites to fractional crystallization of individual mineral phases such as apatite (Jolliff et al, 1989), monazite (Zhao and Copper, 1992;Pan, 1997), or garnet and possible Y-rich accessory phases (Pan, 1997), the existence of the tetrad effect in natural environments is supported by an increasing body of data.…”

Section: Fig 4 δ 18 O Values Of Mineral Separates From the Veinimmementioning

confidence: 97%

Trace element geochemistry during metamorphic dehydration: A case study from the Xingzi Group of Lushan, southeast China.

Tang

Liu

2002

Geochem. J.

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The Xingzi Group, exposed in Lushan, southeast China, is the oldest basement in the Late Proterozoic Jiangnan orogen and composed mainly of metamorphosed psammites and pelitic schists with the grade of amphibolite facies. Eight quartz and felsic veins from two locations in this group have been chosen to investigate trace element behaviour during metamorphic dehydration. One location is at Xixiansi, where the wallrocks are completely metamorphosed psammites, and the other at Huangyansi, where the wallrocks are mainly pelitic schists.According to their field and petrologic characteristics, all the veins studied from the two locations are synmetamorphic in origin and were deposited by metamorphic fluids derived from their wallrocks. This is further indicated by the similar oxygen isotopic compositions of mineral separates between the veins and their immediate wallrocks. The estimated mean δ18 O values of the fluids equilibrated with minerals are 11.2‰ at Xixiansi and 10.2‰ at Huangyansi, supporting no pervasive fluid infiltration on a relatively large scale across whole the Xingzi Group during metamorphism. The much different Nb/Ta, Zr/Hf and Pb/Nd ratios in the veins from those in their wallrocks as well as the REE tetrad effects in the veins at Huangyansi indicate fractionation of the REEs and several geochemical pairs (Nb-Ta, Zr-Hf, and Pb-Nd) during metamorphic dehydration. In addition, the large ion lithophile elements (LILEs) show a different behaviour during this process. The ratios of La/Ba, Sr/Nd and Th/Hf are similar in all veins and wallrocks. Rb/Ba, Ba/Nb, La/Nb, and La/Yb ratios are also similar in the quartz veins and wallrocks, but vary significantly in the felsic veins, suggesting their fractionation in the felsic veins. The various REE abundances in the veins confirm that the REEs in sedimentary rocks can obviously be mobilized during regional metamorphism of amphibolite facies. Based on differences in trace element characteristics of the veins between Xixiansi and Huangyansi, we conclude that the mineralogical compositions of the protoliths most likely play an important role in controlling the chemical compositions of the fluid, and in turn, controlling REE and other trace element behaviour during metamorphic dehydration. Smith and Yardley, 1999). Such veins are important manifestations of fluids related to metamorphism and enable the study of the origins of metamorphic fluids and the behaviour of element during metamorphism. Previous studies on metamorphic veins mainly focused on their mineral, major element and oxygen isotopic compositions

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Y-Ho fractionation and lanthanide tetrad effect observed in cherts.

Cited by 26 publications

References 31 publications

Characteristics of rare earth element abundances in shallow marine continental platform carbonates of Late Neoproterozoic successions from India.

Characteristics of rare earth element abundances in shallow marine continental platform carbonates of Late Neoproterozoic successions from India.

Lanthanide tetrad effect in limestone: a tool to environment analysis of the Ruteh Formation, NW Iran.

Trace element geochemistry during metamorphic dehydration: A case study from the Xingzi Group of Lushan, southeast China.

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