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Metadata Files

Data Publication

In situ EMPA and SIMS investigation of mineral geochemistry of mantle xenoliths from Cerro Nemby (25°24' S, 57°32' W), Paraguay

Bonazzi, Mattia | Zanetti, Alberto | Margutti, Roberto | Mazzucchelli, Maurizio | Vannucci, Riccardo

GFZ Data Services

(2023)

Descriptions

Mantle xenoliths are hosted in lavas localized in the Nemby area (25°24' S, 57°32' W; Asunciòn-Sapucai-Villarrica graben, ASV, central Paraguay: Fig.1), where a small melanephelinitite plug (Cerro Nemby), with elliptical topography (800 x 500 m, about 100 m above the plain), contains very abundant mantle xenoliths (10-15% by volume of the plug) together with crustal xenoliths (Comin-Chiaramonti et al., 2001). According to Le Bas (1987), lavas consist of nephelinite and subordinately of ankaratrite (CIPW Ab < 5 wt% e Ne > 20 wt%). The average size of the mantle xenoliths (10-12 cm, max 45 cm, i.e. the largest observed in ASV) and the compositional range (lherzolite to dunite to pyroxenite) make these xenoliths particularly suitable for a study regarding metasomatic processe(s) affecting the Sub-Continental Lithospheric Mantle of central Paraguay. The dunite results to be the most abundant xenolith type in such lavas. In-situ geochemical characterization was performed on silicates and glasses from very fresh xenoliths, which document a large variety of rock types. Five samples were investigated, namely: i) dunite 3209; ii) spinel harzburgite 3284; iii) spinel lherzolite 3293; iv) olivine websterite 3253 and v) olivine clinopyroxenite 3270. The analyses were directly carried out on thin petrographic sections (30 µm thick) of the selected samples.

Keywords


Originally assigned keywords
Mantle xenoliths
EPOS
multi-scale laboratories
compound material &gt; igneous material &gt; igneous rock &gt; ultramafic igneous rock &gt; peridotite
compound material &gt; igneous material &gt; igneous rock &gt; ultramafic igneous rock &gt; pyroxenite
In Situ/Laboratory Instruments &gt; Probes &gt; ELECTRON MICROPROBES
In Situ/Laboratory Instruments &gt; Probes &gt; ION MICROPROBES
In Situ/Laboratory Instruments &gt; Spectrometers/Radiometers &gt; SIMS

MSL enriched keywords
equipment
mass spectrometer
secondary ionization mass spectrometer
igneous rock - intrusive
ultrabasic intrusive
pyroxenite
minerals
oxide mineral
spinel
silicate minerals
nesosilicates
olivine
Earth's structure
Earth crust
lithosphere
sub-continental lithospheric mantle

MSL enriched sub domains i

geochemistry

Source

https://dataservices.gfz-potsdam.de/panmetaworks/showshort.php?id=efb30626-8dc7-11ed-95b8-f851ad6d1e4b

Source publisher

GFZ Data Services


DOI

10.5880/fidgeo.2022.038


Creators

Bonazzi, Mattia

Istituto di Geoscienze e Georisorse- C.N.R. U.O.S. of Pavia, Pavia, Italy

ORCID:

https://orcid.org/0000-0002-5192-6765

Zanetti, Alberto

Istituto di Geoscienze e Georisorse- C.N.R. U.O.S. of Pavia, Pavia, Italy

ORCID:

https://orcid.org/0000-0001-9026-1519

Margutti, Roberto

Dipartimento di Scienze della Terra e dell’Ambiente, Università di Pavia, Pavia, Italy

Mazzucchelli, Maurizio

Dipartimento di Scienze della Terra e dell’Ambiente, Università di Pavia, Pavia, Italy

ORCID:

https://orcid.org/0000-0002-1475-9961

Vannucci, Riccardo

Dipartimento di Scienze della Terra e dell’Ambiente, Università di Pavia, Pavia, Italy


Contributors

Zanetti, Alberto

ProjectLeader

Istituto di Geoscienze e Georisorse- C.N.R. U.O.S. of Pavia, Pavia, Italy

ORCID:

https://orcid.org/0000-0001-9026-1519

Margutti, Roberto

DataCollector

Dipartimento di Scienze della Terra e dell’Ambiente, Università di Pavia, Pavia, Italy

Vannucci, Riccardo

ProjectLeader

Dipartimento di Scienze della Terra e dell’Ambiente, Università di Pavia, Pavia, Italy

Mass Spectrometry La-Icp Laboratory (IGG-CNR, Italy)

HostingInstitution

IGG-CNR, Italy

labid:

d67c9a04c0a838a931ef0363edc9f5b2

Laboratory Of Geochronology And Radiogenic Isotope Geochemistry-Firenze (IGG-CNR, Italy)

HostingInstitution

IGG-CNR, Italy

labid:

01b0a80e0f68171f033be6b785d25063

Bonazzi, Mattia

ContactPerson

Istituto di Geoscienze e Georisorse- C.N.R. U.O.S. of Pavia, Italy

Zanetti, Alberto

ContactPerson


References

10.1098/rsta.1981.0194

10.1086/627339

10.1016/0895-9811(88)90032-6

10.1007/bf00321486

10.1016/0012-8252(82)90047-2


Citation

Bonazzi, M., Zanetti, A., Margutti, R., Mazzucchelli, M., & Vannucci, R. (2023). In situ EMPA and SIMS investigation of mineral geochemistry of mantle xenoliths from Cerro Nemby (25°24' S, 57°32' W), Paraguay [Data set]. GFZ Data Services. https://doi.org/10.5880/FIDGEO.2022.038


Dates

Available:

2023-05-21

Created:

2022-12-21

Issued:

2023


Rights

Creative Commons Attribution 4.0 International


Geo location(s)

Localization of the area of study, and position of Sierra Baguales, from which the mantle xenoliths were collected


Spatial coordinates