Evidência de mistura e contaminação magmática na lava da área de Tarum, sudoeste da província de Gilan (Irã)
Palavras-chave:
Tarum, Lava, piroclástico, combinação e mistura de magma, contaminação por magma, fracionamento, crosta continental.Resumo
A área estudada está localizada nas altas altitudes da região de Tarum, na região montanhosa de Alborz, sudoeste da província de Gilan, Irã. De acordo com o aspecto tectônico-sedimentológico, a região foi localizada na zona oeste de Alborz-Azerbaijão. As rochas ígneas da área são geralmente unidades piroclásticas e as idades das lavas pertencem ao Eoceno ao Oligoceno. Lavas são basalto, andesito, traquidandesita, dacito e riolito. As rochas piroclásticas são tufos (tufo de cristal lítico, tufo halo-lítico, tufo arenoso, tufo de barro e tuffit), ignimbrito, brecha, escória e pedra-pomes. Camadas de lava rítmica baseadas em sua composição representam uma difração em uma câmara de magma. Resultados de estudos microscópicos (ex: acúmulo mineral não homogêneo, alteração mineral seletiva, erosão e opacificação de margens minerais, limites de Serration entre fenocristais, textura de peneira, margem de opacidade e faces de glóbulos, zoneamento oscilatório em clinopiroxênio, zonas de inclusão em plagioclásio, dois tipos de plagioclásio cristais e apatita em forma de agulha) revelam uma avaliação magmática incluindo fracionamento de Cristal, mistura de magma e contaminação magmática nas rochas. A tendência do padrão comparativo para amostras básicas, intermediárias e ácidas é paralela e mostra a tendência da crosta continental representar a fonte similar entre as amostras e a contaminação da crosta. O magma fonte dessas rochas tem sido influenciado pelos processos AFC (Cristalização Fracionada de Assimilação) e FC (Cristalização Fracionada); Portanto, as propriedades geoquímicas estão longe de sua origem.
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Referências
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Alavi, M., 1996, Tectonostratigraphic synthesis and structural style of the Alborz Mountain system in northern Iran. Geodynamic 21: 1-33.
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Cai, Y., Wang, Y., Cawood, P.A., Fan, W., Liu., H., Xing, X., Zhang, Y., 2014, Neoproterozoicsubduction along the Ailaoshan zone, South China: Geochronological and geochemical evidence from amphibolite, Precambrian Research, 245, 13–28.
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Feigenson, M.D., Patino, L.C., Carr, M.J., 1996, Constraints on partial melting imposed by rare earth element variations in Mauna Kea basalts. J. Geophys. Res. 101, 11815–11829.
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Hofmann, A.W., Jochum, K.P., 1996, Source characteristics derived from very incompatible trace elements in Mauna Loa and Mauna Kea basalts, Hawaii Scientific Drilling Project. J. Geophys. Res. 101, 11831–11839.
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Miyashiro, A., 1974, Volcanic rock series in Island arcs and active continental margins. Am. J. Sci. 274, 321-355.
Moayyed, M., 1991, Petrologic Investigations of Volcano-Plutonic Tertiary belt of Western Alborz- Azarbaijan with a Special View on Hashtjin Area, Ph.D. in geology Tabriz University, pp. 94-125.
Nabavi, M.H., 1976, An introduction to the geology of Iran. Geological Survey of Iran, Tehran, 109 p. (in Persian).
Nazari, H., Salamati, R., 1998, 1/100000 Scaled Map of Rudbar. Geological Survey of Iran.
Pearce, J. A., 1983, Role of the subcontinental lithosphere in magma genesis at active continental margins. In: Hawkesworth C.J. and Norry M.J., (eds.), Continental basalts and mantle xenoliths. Shiva, nantwich, 230-249.
Pearce, J.A., Bender, J.F., De Long, S.E., Kidd, W.S. F., Low, P.J., Gunner, Y., Saroglu, F., Yilmaz, Y., Moorbath, S., and Mithchell, J.G.,1990, Genesis of collision volcanism in eastern Anatolia, Turkey, J. Volc. Geotherm. Res, 44, 189–229.
Peyrowan, H.R., 2002, Geochemical study of hydrothermal alteration zones of magmatic rocks of Tarom area and its environmental effects, Doctoral dissertation of Geology (Ph.D), Islamic Azad University, Science and Research Branch.
Rudnick, R.L, Fountain, D.M., 1995, Nature and composition of the continental crust: a lower crustal perspective. Rev. Geophys. 33(3), 267–309.
Rudnick, R.L., Gao, S., 2003, The composition of the continental crust. In: Rudnick, R.L. (Ed.), The Crust. In: Holland, H.D., Turekian, K.K., (Eds.), Treatise on Geochemistry, vol. 3. Elsevier-Pergammon, Oxford. 64 pp.
Shelly, D., 1993, Igneous and metamorphic rocks under the microscope, Chapman and Hall, 405 pp.
Sun, S.S., and McDonough, W.F., 1989, Magmatism in the oceanic basalts (A.D. Saunders and M.J.Norry, Her ausgeber). Geological Society London Special Publications, 42, 313-345.
Taylor, S.R., and McLennan, S.M., 1985, The continental crust: it's composition and evolution. Blackwell, Oxford, England, 312 p.
Thomas, N., and Tait, S.R., 1997, Dimensions of magmatic inclusions as a constraint on the physical mechanism of mixing, Jour. Volcanol. Geotherm. Res., 75: 167-178.
Wilshire, H. G., McGuire, A. V., Noller, J. S., and Turrin, B. D., 1991, Petrology of lower crustal and upper mantle xenoliths from the Cima, Volcanic Field, California, J. Petrol., 32: 169-200.
Winchester, J.A, and Floyd, P.A., 1977, Geochemical discrimination of different magma series and their differentiation product using immobile elements. Chemical Geology 20: 325-343.
Winter, J.D., 2001, An introduction to igneous and metamorphic petrology, Prentice- hall inc. upper Saddle River, New Jersey. P 697.
Wright, T.L., and Helz, R.T., 1996, Differentiation and magma mixing on Kilauas east rift zone: Further look at the eruptions of 1955 and 1960, Bull. Volcanol, 57: 602-630.
Zarasvandi, A., Rezaei, M., Lentz, D., Pourkaseb, H., Karevani, M., 2015, The Kasian volcanic rocks, Khorramabad, Iran: Evidence for a Jurassic Intra-Oceanic island arc in Neo-Tethys ocean, IJST , 39A2: 165-178.
Zhao, J.H., and Zhou, M.F., 2007, Geochemistry of Neoproterozoic mafic introsions in the panzhihua district (Sichuan Province, SW China): Implication for subduction related metasomatism in the upper mantle. Precambrian Research. 152: 27-47.
Alavi, M., 1996, Tectonostratigraphic synthesis and structural style of the Alborz Mountain system in northern Iran. Geodynamic 21: 1-33.
Amini, B., 2000, 1/100000 Scaled Map of Taroom. Geological Survey of Iran.
Cai, Y., Wang, Y., Cawood, P.A., Fan, W., Liu., H., Xing, X., Zhang, Y., 2014, Neoproterozoicsubduction along the Ailaoshan zone, South China: Geochronological and geochemical evidence from amphibolite, Precambrian Research, 245, 13–28.
Dostal, J., 2017, Rare Earth Element Deposits of Alkaline Igneous Rocks, 6,34,1-12.
Eftekharnejad, J., Stocklin, J., Zahedi, M., Hajian, J., Houshmandzadeh, A., Alavi, M., 1969, 1/2500000 Scaled Map of Zanjan, Geological Survey of Iran.
Feigenson, M.D., Patino, L.C., Carr, M.J., 1996, Constraints on partial melting imposed by rare earth element variations in Mauna Kea basalts. J. Geophys. Res. 101, 11815–11829.
GhotbTahriri, F., Arian, M.A., Haghnazar, Sh., Pourkermani, M., 2017, Petrology of Sirdan volcanic rocks in Alborz Mountains, northern Iran, RevistaPublicando, Vol. 5. No. 14 (2), 19p.
Hofmann, A.W., Jochum, K.P., 1996, Source characteristics derived from very incompatible trace elements in Mauna Loa and Mauna Kea basalts, Hawaii Scientific Drilling Project. J. Geophys. Res. 101, 11831–11839.
Kamali, A.A., Moayyed, M., Jahangiri, A., Amel, N., Pirooj, H., Ameri, A., 2011, The petrography and geochemistry of volcanic rocks of Ghaflankuh, Myaneh (NW Iran), Petrology, 2nd Year, No. 6, 97-115.
Kepezhinskas, P., Defant, M.J., Drummond, M.S., 1996, Progressive enrichment ofisland arc mantle by melt-peridotite interaction inferred from Kamchatka xeno-liths. GeochimicaetCosmochimicaActa 60, 1217–1229.
Khalatbari, M., Akbari, M., Ghalamghash, J., 2016, Geology, Petrology and Magmatic evolutions of Eocene Volcanic Rocks in the area of Aqdagh, northeast Abhar, Journal of ScienceKharazmiUniversity, Vol, 2, No, 1, 33-60.
Khalifa, I.H., El-Bialy, M.Z., Hassan, D.M., 2011, Petrologic and geochemical characterization and mineralization of the metavolcanic rocks of the Heib Formation, Kid Metamorphic Complex, Sinai, Egypt, Geoscience Frontiers, 2(3), 385-402.
Kheirkhah, M., 2013, New investigation on petrogenesis and age dating of quaternary basic lavas in northwest iran, to compare with source centers in turkish-iranian plateau, Scientific Quarterly Journal, Geosciences, Vol, 22, No,88, 205-218.
Koyaguchi, T., and Blake, L., 1991, Origin of mafic enclaves: Constraints on the magma mixing model from fluid dynamic experiments: Enclaves and granite petrology, Elsevier scientific pub. B.V., 415-429.
Krauskopf, K. B. and Bird, D. K., 1976, Introduction to geochemistry. Mcgraw-hill, Inc. 647p.
Li, D., He, D.F., Santosh, M., Tang, J.Y., 2014, Petrogenesis of Late Paleozoic volcanics from the Zhaheba depression, East Junggar: Insights into collisional event in an accretionary orogeny of Central Asia, Lithos 184–187, 167–193.
McDonough, W.F., 1990, Constraints on the composition of the continental lithospheric mantle, Earth planet. Sci. Lett., 101, 1-18.
Miyashiro, A., 1974, Volcanic rock series in Island arcs and active continental margins. Am. J. Sci. 274, 321-355.
Moayyed, M., 1991, Petrologic Investigations of Volcano-Plutonic Tertiary belt of Western Alborz- Azarbaijan with a Special View on Hashtjin Area, Ph.D. in geology Tabriz University, pp. 94-125.
Nabavi, M.H., 1976, An introduction to the geology of Iran. Geological Survey of Iran, Tehran, 109 p. (in Persian).
Nazari, H., Salamati, R., 1998, 1/100000 Scaled Map of Rudbar. Geological Survey of Iran.
Pearce, J. A., 1983, Role of the subcontinental lithosphere in magma genesis at active continental margins. In: Hawkesworth C.J. and Norry M.J., (eds.), Continental basalts and mantle xenoliths. Shiva, nantwich, 230-249.
Pearce, J.A., Bender, J.F., De Long, S.E., Kidd, W.S. F., Low, P.J., Gunner, Y., Saroglu, F., Yilmaz, Y., Moorbath, S., and Mithchell, J.G.,1990, Genesis of collision volcanism in eastern Anatolia, Turkey, J. Volc. Geotherm. Res, 44, 189–229.
Peyrowan, H.R., 2002, Geochemical study of hydrothermal alteration zones of magmatic rocks of Tarom area and its environmental effects, Doctoral dissertation of Geology (Ph.D), Islamic Azad University, Science and Research Branch.
Rudnick, R.L, Fountain, D.M., 1995, Nature and composition of the continental crust: a lower crustal perspective. Rev. Geophys. 33(3), 267–309.
Rudnick, R.L., Gao, S., 2003, The composition of the continental crust. In: Rudnick, R.L. (Ed.), The Crust. In: Holland, H.D., Turekian, K.K., (Eds.), Treatise on Geochemistry, vol. 3. Elsevier-Pergammon, Oxford. 64 pp.
Shelly, D., 1993, Igneous and metamorphic rocks under the microscope, Chapman and Hall, 405 pp.
Sun, S.S., and McDonough, W.F., 1989, Magmatism in the oceanic basalts (A.D. Saunders and M.J.Norry, Her ausgeber). Geological Society London Special Publications, 42, 313-345.
Taylor, S.R., and McLennan, S.M., 1985, The continental crust: it's composition and evolution. Blackwell, Oxford, England, 312 p.
Thomas, N., and Tait, S.R., 1997, Dimensions of magmatic inclusions as a constraint on the physical mechanism of mixing, Jour. Volcanol. Geotherm. Res., 75: 167-178.
Wilshire, H. G., McGuire, A. V., Noller, J. S., and Turrin, B. D., 1991, Petrology of lower crustal and upper mantle xenoliths from the Cima, Volcanic Field, California, J. Petrol., 32: 169-200.
Winchester, J.A, and Floyd, P.A., 1977, Geochemical discrimination of different magma series and their differentiation product using immobile elements. Chemical Geology 20: 325-343.
Winter, J.D., 2001, An introduction to igneous and metamorphic petrology, Prentice- hall inc. upper Saddle River, New Jersey. P 697.
Wright, T.L., and Helz, R.T., 1996, Differentiation and magma mixing on Kilauas east rift zone: Further look at the eruptions of 1955 and 1960, Bull. Volcanol, 57: 602-630.
Zarasvandi, A., Rezaei, M., Lentz, D., Pourkaseb, H., Karevani, M., 2015, The Kasian volcanic rocks, Khorramabad, Iran: Evidence for a Jurassic Intra-Oceanic island arc in Neo-Tethys ocean, IJST , 39A2: 165-178.
Zhao, J.H., and Zhou, M.F., 2007, Geochemistry of Neoproterozoic mafic introsions in the panzhihua district (Sichuan Province, SW China): Implication for subduction related metasomatism in the upper mantle. Precambrian Research. 152: 27-47.
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2018-12-27
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Ghotb-Tahriri, F., Arian, M.-A., Haghnazar, S., & Porkermani, M. (2018). Evidência de mistura e contaminação magmática na lava da área de Tarum, sudoeste da província de Gilan (Irã). Amazonia Investiga, 7(17), 585–598. Recuperado de https://amazoniainvestiga.info/index.php/amazonia/article/view/775
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