Data Publication

Petrological, geochemical and isotopic characterization of kamafugites from East-Central Africa, Italy and Brazil: a review

GFZ Data Services

(2025)

Descriptions

Kamafugites are 'exotic igneous rocks' with mineralogical and chemical compositions that differ from those observed in common magmas. Despite their importance, kamafugites are still a poorly constrained topic and they lack a general petrological model due to their variable petrographic, geochemical and isotopic features. A detailed comparison among kamafugites is necessary to obtain a deeper understanding of the processes involved in their petrogenesis and of their strongly metasomatised mantle sources. Therefore, this data publication doesn’t only provide new geochemical and isotopic data from kamafugites, but a comprehensive data compilation for kamafugite samples in the Western branch of the East Africa Rift (WEAR) in Uganda and Democratic Republic of Congo, the Intra-Apennine Province (IAP), as well as for the Alto Paranaiba (APIP) and Goiás (GAP) provinces in Brazil. 97 kamafugite whole-rock data for the WEAR, 42 for IAP and 51 for APIP and GAP have been collected and compared to highlight similarities and differences, aiming to reconstruct their petrogenesis. The new data in this data publication results from work conducted at Laboratory of Geochronology and Radiogenic Isotope Geochemistry - Pisa1 (IGG-CNR, Italy) supported by WP3 ILGE - MEET project, PNRR - EU Next Generation Europe program, MUR grant number D53C22001400005.

The method description only refers to the new isotopic data acquired on Italian and Brazilian kamafugites: Polished thin sections (28 mm × 48 mm) were prepared at the Dipartimento di Scienze della Terra of the Sapienza University of Rome, after a macroscopic selection. Petrographic analyses have been carried out using a Zeiss Axiophot transmitted polarized light microscope, under plane-polarized light and crossed polars. Micrographs were acquired by means of a digital camera. New isotopic data (Sr-Nd-Pb) have been measured for five Brazilian kamafugites to provide a coherent dataset. The isotope ratios are corrected for in-situ decay using an age of ~80 Ma. We have also performed seven new boron isotope ratios on Italian samples. Sample preparation for the isotopic geochemistry was performed in clean rooms, class 100 for Sr and Pb, and class 1000 for Nd, at the Laboratory of Geochronology and Radiogenic Isotope Geochemistry - Pisa1 (IGG-CNR, Italy). Specific resin (Eichrom for Sr; BioRAD AG MP-50 resin for REE and then Eichrom Ln resin for Nd; Bio-Rad 200-400 mesh AG50W-X8 exchange resin for Pb; ion-exchange resin, 20-50 mesh amberlite, and AG 50 W-X8 cation-exchange resin, 200-400 mesh, for B), in a multi-stage process were used to separate the elements of interest from the matrix. Isotopic analyses (Sr-Nd-Pb and B systematics) were conducted at the Laboratory of Geochronology and Radiogenic Isotope Geochemistry - Pisa1 (IGG-CNR, Italy) using a ThermoFisher Neptune Plus MC-ICP-MS. Measurements were carried out on 2% HNO3 solutions, which include around 20-200 ng/g of analyte. Full analytical details can be found in Agostini et al. (2021, 2022).

Keywords

Originally assigned keywords

EPOS

multi-scale laboratories

geochemistry and microscopy

geochemistry data

Petrology_kalsilite

Petrology_ultrapotassic

Petrology_mantle metasomatism

compound material > igneous material > igneous rock > exotic composition igneous rock > kalsilitic and melilitic rocks

compound material > rock > composite genesis rock > metasomatic rock

EARTH SCIENCE > SOLID EARTH > GEOCHEMISTRY > GEOCHEMICAL PROPERTIES

MSL enriched keywords

analysis

geochronology

Ancillary equipment

model surface monitoring (2D)

camera

isotopic analysis

equipment

mass spectrometer

inductively coupled plasma-mass spectrometer

multicollector-inductively coupled plasma-mass spectrometer

measured property

boron

lead (Pb)

neodymium

Apparatus

optical microscopy

MSL enriched sub domains i

geochemistry

microscopy and tomography

Source

https://dataservices.gfz-potsdam.de/panmetaworks/showshort.php?id=d692ed62-1abf-11f0-914a-f12b0080820d

Source publisher

GFZ Data Services

DOI

10.5880/fidgeo.2025.025

Creators

Innocenzi, Francesca

Dipartimento di Scienze della Terra, Sapienza Università di Roma, Roma, Italy | Istituto di Geoscienze e Georisorse – CNR, Pisa, Italy | School of Natural Sciences, Macquarie University, New South Wales, Australia

ORCID:

https://orcid.org/0000-0001-8619-0199

Foley, Stephen

School of Natural Sciences, Macquarie University, New South Wales, Australia | Research School of Earth Sciences, Australian National University, Canberra, Australia

ORCID:

https://orcid.org/0000-0001-7510-0223

Ronca, Sara

Dipartimento di Scienze della Terra, Sapienza Università di Roma, Roma, Italy

ORCID:

https://orcid.org/0000-0003-0952-8875

Agostini, Samuele

Istituto di Geoscienze e Georisorse – CNR, Pisa, Italy

ORCID:

https://orcid.org/0000-0002-2060-0359

Guarino, Vincenza

Dipartimento di Scienze della Terra, dell'Ambiente e delle Risorse, Università di Napoli Federico II, Complesso Universitario Monte Sant'Angelo, Napoli, Italy

ORCID:

https://orcid.org/0000-0003-4313-5493

Lustrino, Michele

Dipartimento di Scienze della Terra, Sapienza Università di Roma, Roma, Italy | Istituto di Geologia Ambientale e Geoingegneria – CNR, Dipartimento di Scienze della Terra, Sapienza Università di Roma, Roma, Italy

ORCID:

https://orcid.org/0000-0002-1212-7207

Contributors

Innocenzi, Francesca

ContactPerson

Dipartimento di Scienze della Terra, Sapienza Università di Roma, Roma, Italy | Istituto di Geoscienze e Georisorse – CNR, Pisa, Italy | School of Natural Sciences, Macquarie University, New South Wales, Australia

ORCID:

https://orcid.org/0000-0001-8619-0199

Laboratory of Geochronology and Radiogenic Isotope Geochemistry-Pisa1 (IGG-CNR, Italy)

HostingInstitution

Istituto di Geoscienze e Georisorse (IGG) – CNR of Pisa, Pisa, Italy

labid:

de06d05ebede454776df07c5de7f0c90

Sapienza Università di Roma (Italy)

HostingInstitution

Sapienza Università di Roma, Roma, Italy

ILGE TNA/NOA

Sponsor

MEET Project (Monitoring Earth's Evolution and Tectonics)

Sponsor

Innocenzi, Francesca

ContactPerson

Dipartimento di Scienze della Terra, Sapienza Università di Roma, Rome, Italy

References

10.1016/j.lithos.2012.04.018

10.1007/s004100100280

10.1016/s0895-9811(01)00079-7

10.1016/0016-7037(71)90004-4

10.1093/petrology/10.3.536

https://www.livrosabertos.edusp.usp.br/edusp/catalog/view/6/6/26-1

https://hdl.handle.net/2158/402554

10.1016/j.chemgeo.2007.04.009

10.1180/002646100549652

10.1016/j.chemgeo.2008.11.010

10.1017/s0080456800004798

10.1016/0024-4937(92)90008-m

10.1007/s007100200004

https://www.geobrasiliensis.org.br/geobrasiliensis/article/view/73/pdf

10.1180/minmag.1993.057.386.16

10.1016/s0024-4937(01)00054-8

10.1016/j.gca.2019.03.012

10.1016/0012-8252(87)90001-8

10.1016/j.chemgeo.2012.06.016

10.1130/0016-7606(1954)65[39:teovup]2.0.co;2

https://earth.geology.yale.edu/~ajs/1945A/313.pdf

10.1017/s0016756800089718

10.1180/minmag.1942.026.177.01

https://pubs.geoscienceworld.org/msa/ammin/article-pdf/35/9-10/772/4244565/am-1950-772.pdf

10.1080/11035893709444967

10.1016/j.gr.2023.09.005

https://etheses.dur.ac.uk/4909/

10.1016/j.gca.2019.09.041

10.1029/2024gc011683

10.1016/j.earscirev.2020.103256

10.1029/2005jb004224

10.3749/canmin.46.1.19

10.1007/bf02596917

10.1007/bf00402357

10.1093/petrology/egad088

Moraes, L.C., 1984. Petrologia, estratigrafia e potencial diamantı́fero da suı́te vulcânica alcalina da região de Santo Antônio da Barra, Goiás. Unpublished doctoral dissertation, University of Brasilia.

10.1134/s0016702909090031

10.1016/j.lithos.2014.09.011

10.1016/j.jsames.2023.104343

10.4236/ojg.2013.32011

https://orca.cardiff.ac.uk/id/eprint/8625

https://rruff.geo.arizona.edu/doclib/cm/vol26/CM26_45.pdf

10.1016/j.jvolgeores.2004.05.020

https://www.socgeol.info/en/issues/?t=Bollettino&y=1937&v=56#:~:text=Le%20zone%20vulcaniche%20di%20San%20Venanzo%20e%20di%20Cupaello%20pp.%2033%20%2D%2066

- Rosenbusch H. (1887). Mikroskopische Physiographie der Mineralien und Gesteine. Vol. II. Massige Gesteine. E. Schweizerbart’sche Verlagsbuchhandlung, Stuttgart.

10.1016/j.epsl.2009.04.036

https://biblio.naturalsciences.be/rbins-publications/institut-des-parcs-nationaux-du-congo/exploration-du-parc-national-albert-exploratie-van-het-nationaal-albert-park-mission-detudes-vulcanologiques-zending-voor-vulkanologische-studien/bibliographic-references/sahama_study_1958

https://hdl.handle.net/2158/225854

https://archive.org/details/in.gov.ignca.17662

10.1007/s004100050127

10.1180/0026461026640049

https://www.academia.edu/78411332/Leucite_melilitolites_in_Italy_genetic_aspects_and_relationships_with_associated_alkaline_rocks_and_carbonatites

https://www.scopus.com/inward/record.uri?eid=2-s2.0-4344713698&partnerID=40&md5=1bb85f3da5b7f49fb891f53033e49367

10.1080/00206814.2022.2127127

10.1016/0012-821x(83)90097-3

https://ilge.ct.ingv.it/

https://meet.ingv.it/

10.1016/j.earscirev.2025.105238

Citation

Innocenzi, F., Foley, S., Ronca, S., Agostini, S., Guarino, V., & Lustrino, M. (2025). Petrological, geochemical and isotopic characterization of kamafugites from East-Central Africa, Italy and Brazil: a review [Data set]. GFZ Data Services. https://doi.org/10.5880/FIDGEO.2025.025

Dates

Issued:

2025

Language

en

Funding References

Funder name: European Commission

Funder identifier: https://doi.org/10.13039/501100000780

Funder identifier type: Crossref Funder ID

Award title: MEET

Funder name: Ministero dell'Università e della Ricerca

Funder identifier: https://doi.org/10.13039/501100021856

Funder identifier type: Crossref Funder ID

Award number: D53C22001400005

Award title: MEET

Rights

Creative Commons Attribution 4.0 International