The alkaline-carbonatite complex of Jacupiranga (Brazil): Magma genesis and mode of emplacement

Beccaluva, Luigi; Bianchini, Gianluca; Siena, Franca

doi:10.1016/j.gr.2016.11.010

Cited by 44 publications

(36 citation statements)

References 104 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Additional multielement diagrams are also found for other areas: the Ponta Grossa Arch (Gomes et al 2011a, Azzone et al 2013, Beccaluva et al 2017, Chmyz et al 2017, Amambay (Gomes et al 2011b, Comin-Chiaramonti et al 2014, and the Alto Paranaíba province (Gomide et al 2016).…”

Section: Trace and Rare Earth Elementsmentioning

confidence: 72%

“…More recently, Beccaluva et al (2017) noticed the presence of melilite with modal content higher than 10% in ijolitic rocks of the Jacupiranga carbonatites.…”

Section: Petrographic and Mineralogical Considerationsmentioning

confidence: 99%

“…REE fluorocarbonates are relatively abundant in late stage carbonatites (e.g., Barra do Itapirapuã, Cerro Manomó). Chondrite-normalized (Thompson 1982, Boynton 1984, McDonough & Sun 1995 REE distribution diagrams for various carbonatite complexes are discussed in several papers (e.g., Comin-Chiaramonti et al 2005c, 2007a, 2014, Gomes et al 2011a, 2011b, Azzone et al 2013, Gomide et al 2016, Beccaluva et al 2017, Chmyz et al 2017. Patterns are in general marked by high REE concentration and variable LREE/ HREE fractionation degrees.…”

Section: Trace and Rare Earth Elementsmentioning

confidence: 99%

“…Values of Sr i = 0.70538 and Nd i = 0.51253 for a sample of a carbonatite intrusion from Jacupiranga were more recently given by Beccaluva et al (2017). Average values for Upper Cretaceous alkaline occurrences of different regions are: Alto Paranaíba, Sr i = 0.70527 ± 0.00036 and Nd i = 0.51224 ± 0.00006 (Bizzi et al 1994, Gibson et al 1995a, 1995b, and references therein); Taiúva-Cabo Frio and Serra do Mar, Sr i = 0.70447 ± 0.00034 and Nd i = 0.51252±0.00008 (Thompson et al 1998); Lages, Sr i = 0.70485 ± 0.00053 and Nd i = 0.51218 ± 0.00022 (Traversa et al 1996, CominChiaramonti et al 2002.…”

Section: Sr and Nd Isotopesmentioning

confidence: 99%

“…More recently, Beccaluva et al (2017) provided isotopic data for some intrusions of the Jacupiranga complex. The northwestern body includes alkali gabbros, syenodiorites and syenites around dunites, while the southeastern body consists of clinopyroxenites and rocks of the melteigite-ijolite-urtite series and associated carbonatites.…”

Section: Pb Isotopesmentioning

confidence: 99%

See 4 more Smart Citations

Cretaceous carbonatites of the southeastern Brazilian Platform: a review

et al. 2018

View full text Add to dashboard Cite

show abstract

Section: Trace and Rare Earth Elementsmentioning

confidence: 72%

“…More recently, Beccaluva et al (2017) noticed the presence of melilite with modal content higher than 10% in ijolitic rocks of the Jacupiranga carbonatites.…”

Section: Petrographic and Mineralogical Considerationsmentioning

confidence: 99%

Section: Trace and Rare Earth Elementsmentioning

confidence: 99%

Section: Sr and Nd Isotopesmentioning

confidence: 99%

Section: Pb Isotopesmentioning

confidence: 99%

See 3 more Smart Citations

Cretaceous carbonatites of the southeastern Brazilian Platform: a review

et al. 2018

View full text Add to dashboard Cite

show abstract

Soil organic carbon data comparison after 85 years and new ¹³C/¹²C compositions: The case study of the Ferrara province (Northeastern Italy)

Salani,

Bianchini,

Brombin

et al. 2024

J of Env Quality

Self Cite

View full text Add to dashboard Cite

The main causes of soil organic matter (SOM) loss are land use (e.g., conventional agriculture) and land‐use change (e.g., conversion of wetlands into croplands). Before World War II and until 1960s, the Ferrara province in the Emilia‐Romagna region (Northeast Italy) enlarged its agricultural production area through drainage of wetlands. After that, the newly drained area was put into intensive agricultural production with practices that proved to be unsustainable, and whose negative effects (depletion of soil organic carbon [SOC] and emissions of greenhouse gases [GHGs], e.g., CO2) have never been quantified. In this work, we estimated the changes in SOC 85 years after the drainage of the palustrine environment, by comparing 1937 SOC measurements with those made in 2022. Comparison of SOC maps from 1937 and 2022 indicates that most of the area suffered a significant SOC loss (∆OC85 years from 0.05 to 18.57 wt%), except for northern areas in which the peat nature of the soil has been preserved. We also measured the 13C/12C on the 2022 soil samples and generated a present‐day map of the SOC isotopic ratios, which could be used in future as a benchmark to evaluate changes in soil carbon stocks and fluxes.

show abstract

Metasomatic ijolite, glimmerite, silicocarbonatite, and antiskarn formation: carbonatite and silicate phase equilibria in the system Na2O–CaO–K2O–FeO–MgO–Al2O3–SiO2–H2O–O2–CO2

Anenburg,

Walters

2024

Contrib Mineral Petrol

View full text Add to dashboard Cite

Silicocarbonatites are carbonatite rocks containing > 20% silicate minerals. Their formation is not well understood due to low silica solubility in carbonatite melts and negligible amounts of silicate minerals on carbonatite melt cotectics at upper crustal conditions. We explore whether silicocarbonatites can be thought of as antiskarns: rocks formed by leaching of SiO2 from siliceous wall rocks by carbonatite melts, and its deposition as solid silicate minerals by reaction with chemical components already present in the carbonatite melt. Solid state thermodynamic modelling at 1–5 kbar and 500–800 °C predicts that calcite–dolomite–magnetite assemblages will transform to dolomite-free silicocarbonatites with an increase in silica contents. In sodic systems, the formation of aegirine and alkali amphiboles suppresses silica activity despite elevated silica contents. Therefore, dolomite remains stable, but Fe3+ is consumed, firstly from magnetite breakdown, and secondly by coupled Fe oxidation and reduction of CO2 to CO, CH4, and graphite, particularly at higher pressures. Despite a net increase in Fe3+/Fe2+, the system evolves to increasingly lower oxygen fugacity. In aluminous systems, nepheline indicates high temperatures whereas alkali feldspars form at lower temperatures. Modelling of potassic systems demonstrates stability of mostly phlogopite-rich biotites, leading to Fe2+ increase in all other carbonate and silicate phases. We find that perthites are expected in high pressures whereas two feldspars are more likely in lower pressures.Aspects of the clinopyroxene natural compositional trend (diopside to hedenbergite to aegirine) of carbonatite systems can be explained by silica contamination. Ferrous clinopyroxenes typically require low alumina and are predicted in potassic or low temperature sodic systems, primarily at mid to high pressures. Silica contamination permits the formation of silicocarbonatite-like assemblages in a way that is not limited by SiO2 solubility in carbonatite melts. Glimmerites and clinopyroxene-rich rocks (such as the ijolite series) that often occur around carbonatite rocks at the contact with silica-oversaturated wall rocks can be explained as the extreme end of silica contamination of carbonatite melts. Therefore, these clinopyroxenites and glimmerites can form solely via metasomatic processes without the presence of a silicate melt.

show abstract

The alkaline-carbonatite complex of Jacupiranga (Brazil): Magma genesis and mode of emplacement

Cited by 44 publications

References 104 publications

Cretaceous carbonatites of the southeastern Brazilian Platform: a review

Cretaceous carbonatites of the southeastern Brazilian Platform: a review

Soil organic carbon data comparison after 85 years and new ¹³C/¹²C compositions: The case study of the Ferrara province (Northeastern Italy)

Metasomatic ijolite, glimmerite, silicocarbonatite, and antiskarn formation: carbonatite and silicate phase equilibria in the system Na2O–CaO–K2O–FeO–MgO–Al2O3–SiO2–H2O–O2–CO2

Contact Info

Product

Resources

About

The alkaline-carbonatite complex of Jacupiranga (Brazil): Magma genesis and mode of emplacement

Cited by 44 publications

References 104 publications

Cretaceous carbonatites of the southeastern Brazilian Platform: a review

Cretaceous carbonatites of the southeastern Brazilian Platform: a review

Soil organic carbon data comparison after 85 years and new 13C/12C compositions: The case study of the Ferrara province (Northeastern Italy)

Metasomatic ijolite, glimmerite, silicocarbonatite, and antiskarn formation: carbonatite and silicate phase equilibria in the system Na2O–CaO–K2O–FeO–MgO–Al2O3–SiO2–H2O–O2–CO2

Contact Info

Product

Resources

About

Soil organic carbon data comparison after 85 years and new ¹³C/¹²C compositions: The case study of the Ferrara province (Northeastern Italy)