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Mineralogy and Petrology

, Volume 104, Issue 1–2, pp 95–114 | Cite as

Late veins of C3 carbonatite intrusion from Jacupiranga complex (Southern Brazil): fluid and melt inclusions and mineralogy

  • E. Salvioli-MarianiEmail author
  • L. Toscani
  • D. Bersani
  • M. Oddone
  • R. Cancelliere
Original Paper

Abstract

At Jacupiranga (Brazil) the latest manifestations of C3 carbonatite are veins and impregnations of sövite composition containing carbonates, Fe-oxides, apatite, phlogopite, olivine, clinohumite, pyrochlore, zirconolite. Apatite contains fluid inclusions l.s. of two types: (i) two-phase fluid inclusions of complex composition (H2O±CO2±NaCl±KCl±NaHCO3) with 17–50 vol.% of gas bubble, (ii) multi-phase melt inclusions of two types, carbonate-H2O rich and silicate-carbonate-H2O rich with very high homogenization temperatures up to 584°C and up to 1194°C, respectively. The coeval origin of fluid and melt inclusions allows to calculate the trapping pressures which indicate approximate depths of 30 to 60 km for the origin of the veins. Carbonatite veins contain Ba-poor tetra-ferriphlogopite of extreme composition which extends the compositional trend of the micas of Jacupiranga. The occurrence of zirconolite, Nb-rich pyrochlore and Ta-rich U-pyrochlore is mutually exclusive and related, probably, to the variation of fluorine content in the magmatic fluids.

Keywords

Calcite Magnetite Olivine Apatite Fluid Inclusion 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgments

The authors are very grateful to Prof. Morbidelli who kindly supplied the studied samples. We would like to thank Prof. G. Venturelli and the anonymous reviewers of Mineralogy and Petrology for critical reading and helpful comments and suggestions on the manuscript. This research was financially supported by MIUR (Ministero dell’Istruzione, dell’Università e della Ricerca).

Supplementary material

710_2011_179_MOESM1_ESM.pdf (265 kb)
Fig. 1 Transmitted (A–H) and reflected (I–J) light microphotographs of minerals in the investigated samples. A: thin film of dolomite (Do) between apatite (Ap) and calcite (Cc) (C3). B: dolomite exsolution in calcite (C3, CO). C: late vein of Mg-calcite (Mg-Cc) containing rare strontianite and apatite and crossing early calcite and apatite crystals (C3). D: rounded calcite inclusion in euhedral apatite (C3). E: small euhedral apatite in dolomite (CJ). F: small vein of apatite in CJ. G: cluster of sub-rounded crystals of apatite in calcite (CO). H: poikilitic and partially absorbed magnetite (Mt) (CJ), the enclosed phases are apatite and calcite. I: exsolution and patches of ilmenite (Ilm, dark grey) in magnetite (light grey) (CO). J: magnetite containing ilmenite, and pyrrhotite (Prt) containing pentlandite (Ptd) and chalcopyrite (Clp) (C3). Bar = 200 μm (PDF 265 kb)
710_2011_179_MOESM2_ESM.pdf (354 kb)
Fig. 2 Back-scattered electron images performed by JEOL scanning electron microscope. A: rounded inclusion of calcite (Cc) in apatite (Ap) containing oriented small needles of strontianite (Str) (CO). B: late vein of Mg-calcite (Mg-Cc) with apatite and strontianite. D: a complex association of magnetite (Mt), ilmenite (Ilm), zirconolite (Zrl), apatite and calcite (CO). E: inclusion containing sphalerite (Sph), dolomite (Do), ilmenite, barite (Bar) in magnetite (CO). F: siderite (Syd), Cd-sphalerite (Cd-Sph), galena (Gln) and apatite, surrounded by apatite and calcite (CJ). G: pyrrhotite (Prt) with an oxidized rim of Mg-Fe-Ca-sulphate (Mln, melanterite group mineral) (C3). Bar = 20 μm (in C bar = 100 μm) (PDF 354 kb)
710_2011_179_MOESM3_ESM.pdf (24 kb)
ESM Table 1 (PDF 24 kb)
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ESM Table 2 (PDF 17 kb)
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ESM Table 3 (PDF 17 kb)
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ESM Table 4 (PDF 17 kb)
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ESM Table 5 (PDF 21 kb)

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Copyright information

© Springer-Verlag 2011

Authors and Affiliations

  • E. Salvioli-Mariani
    • 1
    Email author
  • L. Toscani
    • 1
  • D. Bersani
    • 2
  • M. Oddone
    • 3
  • R. Cancelliere
    • 4
  1. 1.Dipartimento di Scienze della TerraUniversità di ParmaParmaItaly
  2. 2.Dipartimento di FisicaUniversità di ParmaParmaItaly
  3. 3.Dipartimento di Chimica GeneraleUniversità di PaviaPaviaItaly
  4. 4.NocetoItaly

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