2026-04-20T08:01:16Zhttp://doidb.wdc-terra.org/oaip/oaioai:doidb.wdc-terra.org:81162025-03-23T14:20:39ZDOIDBDOIDB.FIDfalse4DOIDB.FID
10.5880/fidgeo.2022.038
Bonazzi, Mattia
Mattia
Bonazzi
0000-0002-5192-6765
Istituto di Geoscienze e Georisorse- C.N.R. U.O.S. of Pavia, Pavia, Italy
Zanetti, Alberto
Alberto
Zanetti
0000-0001-9026-1519
Istituto di Geoscienze e Georisorse- C.N.R. U.O.S. of Pavia, Pavia, Italy
Margutti, Roberto
Roberto
Margutti
Dipartimento di Scienze della Terra e dell’Ambiente, Università di Pavia, Pavia, Italy
Mazzucchelli, Maurizio
Maurizio
Mazzucchelli
0000-0002-1475-9961
Dipartimento di Scienze della Terra e dell’Ambiente, Università di Pavia, Pavia, Italy
Vannucci, Riccardo
Riccardo
Vannucci
Dipartimento di Scienze della Terra e dell’Ambiente, Università di Pavia, Pavia, Italy
In situ EMPA and SIMS investigation of mineral geochemistry of mantle xenoliths from Cerro Nemby (25°24' S, 57°32' W), Paraguay
GFZ Data Services
2023
Mantle xenoliths
EPOS
multi-scale laboratories
compound material > igneous material > igneous rock > ultramafic igneous rock > peridotite
compound material > igneous material > igneous rock > ultramafic igneous rock > pyroxenite
In Situ/Laboratory Instruments > Probes > ELECTRON MICROPROBES
In Situ/Laboratory Instruments > Probes > ION MICROPROBES
In Situ/Laboratory Instruments > Spectrometers/Radiometers > SIMS
Zanetti, Alberto
Alberto
Zanetti
0000-0001-9026-1519
Istituto di Geoscienze e Georisorse- C.N.R. U.O.S. of Pavia, Pavia, Italy
Margutti, Roberto
Roberto
Margutti
Dipartimento di Scienze della Terra e dell’Ambiente, Università di Pavia, Pavia, Italy
Vannucci, Riccardo
Riccardo
Vannucci
Dipartimento di Scienze della Terra e dell’Ambiente, Università di Pavia, Pavia, Italy
Mass spectrometry la-icp laboratory (IGG-CNR, Italy)
d67c9a04c0a838a931ef0363edc9f5b2
IGG-CNR, Italy
Laboratory of Geochronology and Radiogenic Isotope Geochemistry - Firenze (IGG-CNR, Italy)
01b0a80e0f68171f033be6b785d25063
IGG-CNR, Italy
Bonazzi, Mattia
Istituto di Geoscienze e Georisorse- C.N.R. U.O.S. of Pavia, Italy
Zanetti, Alberto
2023-05-21
2022-12-21
Dataset
to be updated
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
CC BY 4.0
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.
Localization of the area of study, and position of Sierra Baguales, from which the mantle xenoliths were collected
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-72.3537
-50.5304
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