Composition of crystals from Ponte Nova Mafic-Ultramafic Alkaline Massif (PNAM) SE, Brazil

Ambrosio, Mariana R; ORCID: 0000-0001-9396-4076
We present major, trace and Sr isotopic data of feldspar crystals from various intrusions within the potassic Ponte Nova Mafic-Ultramafic Alkaline Massif (PNAM; 86.7 Ma), which exhibit varying degrees of contamination by the crustal country rock. Additionally, we provide compositional data of biotite, amphibole, ilmenite, and magnetite from the PNAM. We also include data of a few feldspars and biotite crystals of the country rock, which comprises a Precambrian calc-alkaline granite from the Serra da Água Limpa batholith. The crystals in 30- to 120-µm polished thin sections were analyzed using EMP, LA-ICP-MS, LA-MC-ICP-MS, and TIMS. Prior to analysis, chemical zonings, resorption features, and mineral inclusions were identified through optical and scanning electron microscope to ensure their avoidance during analysis.
How to cite this dataset:
Ambrosio, M. R., 2024. Composition of crystals from Ponte Nova Mafic-Ultramafic Alkaline Massif (PNAM) SE, Brazil, Version 1.0. Interdisciplinary Earth Data Alliance (IEDA). Accessed 2024-05-21.
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Creative Commons Attribution-ShareAlike 4.0 International [CC-BY-SA-4.0]
Coverage Scope: Regional (Continents, Oceans)
User Contributed Keyword(s):
mineral chemistries, crustal assimilation, magmatic recharge, alkaline rocks
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