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Magnetic susceptibility mapping of the Cambrian El Hongo pluton, Eastern Sierras Pampeanas, Argentina

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Abstract

A map of bulk magnetic susceptibility was obtained on El Hongo trondhjemite, a small Cambrian pluton intruding the metamorphic basement in Eastern Sierras Pampeanas, Argentina, based on systematic magnetic susceptibility measurement at 450 sites using a SM30 susceptibility meter. Samples were collected on 58 sites and their bulk magnetic susceptibility was measured in laboratory with a Bartington MS2 system. Point-to-point comparison showed differences, that were attributed to the effect of roughness of the surveyed surfaces, and to the development of a weathered cap. However, the difference was systematic and in accordance with expected values predicted by manufacturer tables, whereby, once corrected with the appropriate factor, the obtained values with SM30 susceptibility meter were regarded as representative of fresh rocks. The resulting map was interpreted in terms of variation in abundance of magnetite, which is present in the rocks as a magmatic mineral, altered to hematite (martitized) in varying degrees. The map revealed that El Hongo trondhjemite is a weakly magnetic pluton, with a typical bulk susceptibility of about 500 × 10−6 SI, which would correspond to an abundance of magnetite below 0.2 vol%, but with conspicuous variations. Lows in the outer sector and in the vicinity of metamorphic xenoliths were interpreted as due to destruction of magnetic minerals linked to reactions between magma and host rock. A distinct concentric pattern in the western area could indicate the presence of a separate intrusion. Finally, alternate highs and lows in susceptibility follow the undulations in regional schistosity, which in turn would have controlled the emplacement of the pluton. Thus we provide a good example of the utility of magnetic susceptibility mapping in granitoid terrains, as an expeditious way for preliminary mapping that could guide further and more detailed research.

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References

  • Aceñolaza F.G. and Toselli A.J., 1981. Geology of Northwestern Argentina. Special Publication, Facultad de Ciencias Naturales e Instituto Miguel Lillo, Universidad Nacional de Tucumán, Tucumán, Argentina (in Spanish).

    Google Scholar 

  • Bonalumi A. and Baldo E., 2002. Ordovician magmatism in the Sierras Pampeanas of Córdoba. In: Aceñolaza F.G. (Ed.), Aspects of the Ordovician System in Argentina. INSUGEO, Serie Correlación Geológica, 16, 243–256.

    Google Scholar 

  • Clark D.A. and Emerson D.W., 1991. Notes on rock magnetization characteristics in applied geophysical studies. Explor. Geophys., 22, 547–555.

    Article  Google Scholar 

  • D’Eramo F.J., 2003. Petrology and Emplacement of the El Hongo and Calmayo Plutons, and Their Relationship with the Geological Evolution of Sierra Chica de Córdoba. PhD Thesis. Universidad Nacional de Río Cuarto, Río Cuarto, Córdoba, Argentina (in Spanish).

    Google Scholar 

  • D’Eramo F., Pinotti L., Tubía J.M., Vegas N., Aranguren A., Tejero R. and Gómez D., 2006. Coalescence of lateral spreading magma ascending through dykes: a mechanism to form a granite canopy (El Hongo pluton, Sierras Pampeanas, Argentina). J. Geol. Soc. London, 163, 1–12.

    Article  Google Scholar 

  • D’Eramo F., Tubía J.M., Pinotti L., Vegas N., Coniglio J., Demartis M., Aranguren A. and Basei M., 2013. Granite emplacement by crustal boudinage: example of the Calmayo and El Hongo plutons (Córdoba, Argentina). Terra Nova, 25, 423–430.

    Article  Google Scholar 

  • Dalla Salda L.H., Dalziel I.W.D., Cingolani C.A. and Varela R., 1992. Did the Taconic Appalachians continue into South America? Geology, 20, 1059–1062.

    Article  Google Scholar 

  • de Wall H., Karl A., Nano L., Schmitt T. and Rieger M., 2000. Magnetic susceptibility measurements for the petrographic characterization of Granitoids: Comparison of field and laboratory measurements in the Saghro region of the anti-Atlas of Morocco. Z. Angew. Geol., 46, 223–230 (in German).

    Google Scholar 

  • de Wall H., Dietl C., Streit V., Rückert D. and Rohrmüller J., 2008. Field mapping of magnetic susceptibility as tool for petrographic characterization of granitoids - a key study in the Hauzenberg pluton, Bavarian Forest, Germany. Neues. Jahrb. Geol. Palaontol.-Abh., 248, 129–137.

    Article  Google Scholar 

  • Frost B.R., 1991. Magnetic petrology: factors that control the occurrence of magnetite in crustal rocks. In: Lindsley D.H. (Ed.), Oxide Minerals: Petrologic and Magnetic Significance. Reviews in Mineralogy, 25, 489–509.

    Google Scholar 

  • Gattacceca J., Eisenlohr P. and Rochette P., 2004. Calibration of in situ magnetic susceptibility measurements. Geophys. J. Int., 158, 42–49.

    Article  Google Scholar 

  • Geuna S., Escosteguy L., Díaz Appella B., D’Eramo F. and Pinotti L., 2016. Magnetic properties of xenoliths in the El Hongo trondhjemite (Cambrian), Córdoba province, Argentina. LATINMAG Lett., 6 Special Issue, D11, 1–7 (in Spanish).

    Google Scholar 

  • Gleizes G., Nédélec A., Bouchez J.-L., Autran A. and Rochette P., 1993. Magnetic susceptibility of the Mont-Louis Andorra ilmenite-type granite (Pyrenees): A new tool for the petrographic characterization and regional mapping of zoned granite plutons. J. Geophys. Res., 98, 4317–4331.

    Article  Google Scholar 

  • Hageskov B., 1984. Magnetic susceptibility used in mapping of amphibolite facies recrystallisation in basic dykes. Tectonophysics, 108, 339–351.

    Article  Google Scholar 

  • Heritage Geophysics Inc., 2003. Magnetic Susceptibility Meter SM-30 User’s Manual. Heritage Geophysics, Littleton, CO.

    Google Scholar 

  • Ishihara S., 1981. The granitoid series and mineralization. Econ. Geol., 75th Anniv. Vol., 458-484.

  • Ishihara S., Anhaeusser C.R. and Robb L.J., 2002a. Granitoid-series evaluation of the Archaean Johannesburg dome granitoids, South Africa. Bull. Geol. Surv. Japan, 53, 1–9.

    Article  Google Scholar 

  • Ishihara S., Robb L., Anhaeusser C. and Imai A., 2002b. Granitoid series in terms of magnetic susceptibility: a case study from the Barberton Region, South Africa. Gondwana Res., 5, 581–589.

    Article  Google Scholar 

  • Jordanova D., Veneva L. and Hoffmann V., 2003. Magnetic susceptibility screening of anthropogenic impact on the Danube river sediments in northwestern Bulgaria - preliminary results. Stud. Geophys. Geod., 47, 403–418.

    Article  Google Scholar 

  • Kontny A. and Dietl C., 2002. Relationships between contact metamorphism and magnetite formation and destruction in a pluton’s aureole, White-Inyo Range, eastern California. Geol. Soc. Am. Bull., 114, 1438–1451.

    Article  Google Scholar 

  • Latham A.G., Harding K.L., Lapointe P., Morris W.A. and Balch S.J., 1989. On the lognormal distribution of oxides in igneous rocks, using magnetic susceptibility as a proxy for oxide mineral concentration. Geophys. J., 96, 179–184.

    Article  Google Scholar 

  • O’Reilly W., 1984. Rock and Mineral Magnetism. Blackie, Glasgow, U.K.

    Book  Google Scholar 

  • Pankhurst R.J. and Rapela C.W., 1998. The Proto-Andean margin of Gondwana: an introduction. In: Pankhurst R.J. and Rapela C.W. (Eds.), The Proto-Andean Margin of Gondwana. Geological Soc. London Spec. Publ., 142, 3–9.

    Google Scholar 

  • Pinotti L., D’Eramo F., Vegas N., Tubía J.M. and Coniglio J., 2004. Magnetic mineralogy of granitoids of the Sierras de Córdoba. In: Brodtkorb M.K., Koukharsky M., Quenardelle S. and Montenegro T. (Eds.), Advances in Mineralogy, Metalogeny and Petrology 2004. Proceedings of the 7th Congress of Mineralogy and Metallogeny, Río Cuarto, Córdoba, Argentina (in Spanish).

    Google Scholar 

  • Rapela C.W., Pankhurst R.J., Casquet C., Baldo E., Saavedra J. and Galindo C., 1998. The Pampean Orogeny of the southern Proto-Andes: Cambrian continental collision in the Sierras de Córdoba. In: Pankhurst R.J. and Rapela C.W. (Eds.), Proto-Andean margin of Gondwana. Geological Soc. London Spec. Publ., 142, 181–217.

    Article  Google Scholar 

  • Rochette P., 1987. Magnetic susceptibility of the rock matrix related to magnetic fabric studies. J. Struct. Geol., 9, 1015–1020.

    Article  Google Scholar 

  • Shaw D.M., 1961. Element distribution laws in geochemistry. Geochim. Cosmochim. Acta, 23, 116–134.

    Article  Google Scholar 

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Correspondence to Silvana Geuna.

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Geuna, S., Escosteguy, L., Díaz Appella, B. et al. Magnetic susceptibility mapping of the Cambrian El Hongo pluton, Eastern Sierras Pampeanas, Argentina. Stud Geophys Geod 61, 219–232 (2017). https://doi.org/10.1007/s11200-016-1070-7

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  • DOI: https://doi.org/10.1007/s11200-016-1070-7

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