Biogeochemistry of REE elements and tetrad effect in the soil-plant system: a study on volcanic rock covers in southernmost Brazil

Cunha, Maria do Carmo Lima e; Nardi, Lauro Valentim Stoll; Müller, Ingke Frotta

doi:10.1590/s0001-37652012005000069

Cited by 9 publications

(3 citation statements)

References 24 publications

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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%

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

confidence: 67%

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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“…lanthanide effect (LTE) or double-double feature (Masuda and Ikeuchi, 1978) is tetrad one of the factors which controls the REE distribution and affects their behavior. Despite controversy on the origin of this phenomenon by some researchers (McLennan, 1994;Nakamura et al, 2007), the LTE has been widely applied as a new and good geochemical indicator to assess the geochemical processes involved during bauxite formation (Akagi et al, 1993;Broska et al, 2006;Chu et al, 2009;Cunha et al, 2012;Abedini et al, 2017;Rezaei Azizi et al, 2017;Abedini et al, 2018a).…”

Section: Geological Background and Previous Workmentioning

confidence: 99%

Ree mobility and tetrad effects in bauxites an example from the Kanisheeteh deposit, NW Iran

Abedini¹

2019

Acta Geodynamica Et Geomaterialia

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The Kanisheeteh bauxite deposit (NW Iran) is located on the Irano-Himalaya karst bauxite belt and was developed as stratiform horizon along the contact of the Permian and Triassic Formations. Based on absolute weathering index (AWI), HREE were leached out, whereas LREE suffered both leaching and fixation during bauxitization. The non-CHARAC characteristic of Y/Ho ratios can be attributed to geochemically known phenomenon as the "tetrad effect". The simultaneous convex and concave curves of the tetrad effect were observed in the chondritenormalized REE patterns of the bauxite ores. The correlation between the sizes of T 4 and AWI% values revealed two separate populations. The first one is characterized by a wide variation in sizes of T 4 and very narrow AWI% values, and is thought to be related to acidic zone of the profile. In contrast, the second one is marked by a narrow variation in sizes of T 4 and wide variation in AWI% values, and is conceived to be affiliated to alkaline zone of the profile. In this research, the tetrad effect proved to be capable of clarifying the geochemical characteristics of the deposit and can be applied as a good geochemical index to investigate the prevailed paleoconditions of depositional environments.

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“…as a new geochemical/mathematical-based tool to interpret irregular curves in normalized REE distribution patterns in a wide range of deposits (Kawabe, 1995;Lee et al, 1994;Irber, 1999;Jahn et al, 2001;Broska et al, 2006;Feng et al, 2011;Cunha et al, 2012;Nardi et al, 2012;Cao et al, 2013;Lee et al, 2013;Duc-Tin and Keppler, 2015;Abedini et al, 2017;Rezaei Azizi et al, 2017;Abedini et al, 2018a). Lee et al (1994) went on to suggest that the zigzag pattern of normalized REE patterns are indicative of an imperfect tetrad effect phenomenon in geochemical systems.…”

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REE Tetrad Effect as a Powerful Indicator of Formation Conditions of Karst Bauxites: A Case Study of the Shahindezh Deposit, NW Iran

Abedini

Azizi

Calagari

2019

Acta Geologica Sinica (Eng)

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Study of the concentration of major, trace, and rare earth elements (REE) in the Shahindezh karst bauxite deposit, northwestern Iran clarifies the relationship of the tetrad effect with geochemical parameters in the bauxite ores. The existence of irregular curves in the chondrite‐normalized REE patterns as well as non‐CHARAC behavior of geochemically isovalent pairs (Y/Ho) are related to the tetrad effect. The meaningful positive correlation between the sizes of the calculated T3 tetrad effect and some geochemical factors such as Y/Ho, ΣREE, La/Y, (La/Yb)N, and (LREE/HREE)N as well as some major oxides‐based parameters like Al2O3 + LOI/SiO2 + Fe2O3, Al2O3/Fe2O3, Al2O3 + LOI, IOL, and SiO2 + Fe2O3 indicate that the studied bauxite horizon was likely deposited by different (acidic and/or alkalic) solutions at different stages. The lower part of the studied horizon with a thickness of ∼4.7 m displays alkali characteristics whereas the upper parts of the horizon with a thickness of ∼5.3 m are characterized by more acidic conditions. These results are fully supported by the co‐occurrence of convex‐concave tetrad effect curves in the chondrite‐normalized REE patterns. Therefore, the tetrad effect phenomenon used in this study has proved to be a good and reliable geochemical proxy to assess the conditions of the depositional environment in the Shahindezh bauxite ores.

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Biogeochemistry of REE elements and tetrad effect in the soil-plant system: a study on volcanic rock covers in southernmost Brazil

Cited by 9 publications

References 24 publications

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

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

Ree mobility and tetrad effects in bauxites an example from the Kanisheeteh deposit, NW Iran

REE Tetrad Effect as a Powerful Indicator of Formation Conditions of Karst Bauxites: A Case Study of the Shahindezh Deposit, NW Iran

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