نوع مقاله : مقاله پژوهشی
نویسنده
پژوهشکده علوم زمین، سازمان زمین‌شناسی کشور، تهران، ایران
چکیده
مجموعه دگرگونی باجگان در پایانۀ جنوب خاوری پهنه سنندج- سیرجان و در شمال مکران واقع شده است. سنگ های دگرگون این مجموعه خاستگاه آذرین و رسوبی دارند و با همبری گسله در کنار مجموعه های افیولیتی و آمیزه های رنگین قرار گرفته اند. ویژگی های سنگ‌شناسی این مجموعه به‌گونه ای است که می توان آنها را در قالب چهار واحد اصلی طبقه بندی کرد. این واحدها توسط رسوبات پلیوسن و کواترنری پوشیده شده اند. بررسی ساختاری در این مجموعه نشان دهنده سه مرحله دگرریختی هم‌زمان با دگرگونی در شرایط شکل‌پذیر است. ساختارهای اصلی در این ناحیه چین خوردگی ها، برگوارگی ها و خطوارگی های متعددی هستند که هر کدام طی مرحله مشخصی از دگرریختی به‌وجود آمده و بر روی یکدیگر فرانهاده شده اند. عناصر ساختاری شناخته شده در این مجموعه به ترتیب در زمان فرورانش، فرارانش افیولیت ها و پدیدارشدگی به‌وجود آمده اند.
کلیدواژه‌ها
موضوعات
Agard, P., Monié, P., Gerber, W., Omrani, J., Molinaro, M., Meyer, B., Labrousse, L ., Vrielynck, B., Jolivet, L., and Yamato, P., 2006. Transient, synobduction exhumation of Zagros blueschists inferred from P-T, deformation, time and kinematic constraints: Implications for Neotethyan wedge dynamics. J. Geophys. Res. 111, B11401. http://dx.doi.org/10.1029/2005JB004103, 28 pp.
Burg, J.-P., 2018. Geology of the onshore Makran accretionary wedge: Synthesis and tectonic interpretation. Earth Sci. Rev. 185, 1210-1231.
Davoudian, A. R., Genser, J., Dachs, E., and Shabanian, N., 2008. Petrology of eclogites from north of Shahrekord, Sanandaj-Sirjan Zone, Iran. Mineralogy and Petrology 92, 393– 413.
Delavari, M., Dolati, A., Marroni, M., Pandolfi, L., and Saccani E., 2016. Association of MORB and SSZ ophiolites along the shear zone between Coloured Mélange and Bajgan Complexes (North Makran, Iran): Evidence from the Sorkhband area. Ofioliti, 41, 21-34.
Dorani, M., Arvin, M., Oberhänsli, R., and Dargahi, S., 2017. P-T evolution of metapelites from the Bajgan complex in the Makran accretionary prism, south eastern Iran. Geochem. 77, 459–475.
Hassanzadeh, J., and Wernick, B.P., 2016. The Neotethyan Sanandaj-Sirjan zone of Iran as an archetype for passive margin-arc transitions. Tectonics 35, 586–621.
Hunziker, D., 2014. Magmatic and Metamorphic History of the North Makran Ophiolites and Blueschists (SE Iran): Influence of Fe3+/Fe2+ Ratios in Blueschist Facies Minerals on Geothermobarometric Calculations. ETH Zurich, Switzerland, Zürich (ETH-Zürich 364 pp).
Hunziker, D., Burg, J.P., Bouilhol, P., and Quadt, A., 2015. Jurassic rifting at the EurasianTethys margin: geochemical and geochronological constraints from granitoids of North Makran, SE Iran. Tectonics 34 (3), 571–593.
Hushmand Zadeh, A., and Berberian, M., 1972. A brief note on early kimmerian orogeny and high grade metamorphism in the Sanandaj-Sirjan belt, Iran. Ministry of Economy, Geological Survey of Iran.
Hushmand Zadeh, A., 1977. Ophiolites of south Iran and their problems: unpublished report field, Geological and Mineral Survey of Iran.
Keary, P., Klepeis, K.A., and Vine, F.J., 2009. Global Tectonic, third ed. Wiley-Blackwell,482 p.
McCall, G.J.H., 1985. Explanatory Text of the Minab Quadrangle Map: 1:250,000, No. J13. Geological Survey of Iran, Tehran, 530 p.
McCall, G.J.H., 1997. The geotectonic history of the Makran and adjacent areas of southern Iran.J. Asian Earth Sci. 15, 517-531.
McCall, G.J.H., and Kidd, R.G.W., 1982. The Makran southeastern Iran: the anatomy of a convergent margin active from Cretaceous to present. In: Leggett, J.K. (Ed.), Trench-forearc geology: sedimentation and tectonics of modern and ancient plate margins, Geological Society of London Special Publications vol. 10, pp. 387-397.
McCall, G.J.H., 2002. A summary of the geology of the Iranian Makran. Geological Society, London, Special Publications, v. 195, p. 147-204
Miyashiro, A., 1961. Evolution of metamorphic belts. Journal of Petrology 2, 277–311.
Oxburgh, E.R., and Turcotte, D.I., 1971. Origin of paired metamorphic belts and crustal dilation in Island arc regions’’. J. Geophys. Res. 76, 1315–1327.
Pandolfi, L., Barbero, E., Marroni, M., Delavari, M., Dolatid, A., Di Rosa, M., Frassi, C., Langone, A., Farina, F., MacDonald, C. S., and Saccani, E., 2021. The Bajgan Complex revealed as a Cretaceous ophiolite-bearing subduction complex: A key to unravel the geodynamics of Makran (southeast Iran). Journal of Asian Earth Sciences, 222,104965.
Sabzehei, M., 1974. Les mélanges ophiolitiques de la région d’Esfandageh (Iran méridional). Etude pétrologique et structurale; interprétation dans le cadre Iranien, Ph.D. thesis, 306 pp., Université de Grenoble, Grenoble, France.
Sarkarinejad, K., 1999. Tectonic finite strain analysis using: Ghouri deformed conglomerate, Neyriz area, Southwestern Iran. Iranian Journal of Science and Tecnology. 23, 352–363.
Sarkarinejad, K., and Azizi, A., 2008. Slip partitioning and inclined dextral transpressio along the Zagros Thrust System, Iran. Journal of Structural Geolgy. 30, 116–136.
Sheikholeslami, M.R., 2002. Evolution structurale et métamorphique de la marge sud de la microplaque de l’Iran central: les complexes métamorphiques de la région de Neyriz (zone de Sanandaj-Sirjan), Thèse, université de Brest, 194 p.
Sheikholeslami, R., Bellon, H., Emami, H., Sabzehei, M., and Pique, A., 2003. Nouvelles données structurales et datations 40K/40Ar surles roches métamorphiques de la region de Neyriz (zone de Sanandaj-Sirjan, Iran méridional). Leur intérêt dans le carde du domaine néo-téthysien du Moyen-Orient. C. R. Geosci. 335, 981–991.
Burg, J.-P., 2018. Geology of the onshore Makran accretionary wedge: Synthesis and tectonic interpretation. Earth Sci. Rev. 185, 1210-1231.
Davoudian, A. R., Genser, J., Dachs, E., and Shabanian, N., 2008. Petrology of eclogites from north of Shahrekord, Sanandaj-Sirjan Zone, Iran. Mineralogy and Petrology 92, 393– 413.
Delavari, M., Dolati, A., Marroni, M., Pandolfi, L., and Saccani E., 2016. Association of MORB and SSZ ophiolites along the shear zone between Coloured Mélange and Bajgan Complexes (North Makran, Iran): Evidence from the Sorkhband area. Ofioliti, 41, 21-34.
Dorani, M., Arvin, M., Oberhänsli, R., and Dargahi, S., 2017. P-T evolution of metapelites from the Bajgan complex in the Makran accretionary prism, south eastern Iran. Geochem. 77, 459–475.
Hassanzadeh, J., and Wernick, B.P., 2016. The Neotethyan Sanandaj-Sirjan zone of Iran as an archetype for passive margin-arc transitions. Tectonics 35, 586–621.
Hunziker, D., 2014. Magmatic and Metamorphic History of the North Makran Ophiolites and Blueschists (SE Iran): Influence of Fe3+/Fe2+ Ratios in Blueschist Facies Minerals on Geothermobarometric Calculations. ETH Zurich, Switzerland, Zürich (ETH-Zürich 364 pp).
Hunziker, D., Burg, J.P., Bouilhol, P., and Quadt, A., 2015. Jurassic rifting at the EurasianTethys margin: geochemical and geochronological constraints from granitoids of North Makran, SE Iran. Tectonics 34 (3), 571–593.
Hushmand Zadeh, A., and Berberian, M., 1972. A brief note on early kimmerian orogeny and high grade metamorphism in the Sanandaj-Sirjan belt, Iran. Ministry of Economy, Geological Survey of Iran.
Hushmand Zadeh, A., 1977. Ophiolites of south Iran and their problems: unpublished report field, Geological and Mineral Survey of Iran.
Keary, P., Klepeis, K.A., and Vine, F.J., 2009. Global Tectonic, third ed. Wiley-Blackwell,482 p.
McCall, G.J.H., 1985. Explanatory Text of the Minab Quadrangle Map: 1:250,000, No. J13. Geological Survey of Iran, Tehran, 530 p.
McCall, G.J.H., 1997. The geotectonic history of the Makran and adjacent areas of southern Iran.J. Asian Earth Sci. 15, 517-531.
McCall, G.J.H., and Kidd, R.G.W., 1982. The Makran southeastern Iran: the anatomy of a convergent margin active from Cretaceous to present. In: Leggett, J.K. (Ed.), Trench-forearc geology: sedimentation and tectonics of modern and ancient plate margins, Geological Society of London Special Publications vol. 10, pp. 387-397.
McCall, G.J.H., 2002. A summary of the geology of the Iranian Makran. Geological Society, London, Special Publications, v. 195, p. 147-204
Miyashiro, A., 1961. Evolution of metamorphic belts. Journal of Petrology 2, 277–311.
Oxburgh, E.R., and Turcotte, D.I., 1971. Origin of paired metamorphic belts and crustal dilation in Island arc regions’’. J. Geophys. Res. 76, 1315–1327.
Pandolfi, L., Barbero, E., Marroni, M., Delavari, M., Dolatid, A., Di Rosa, M., Frassi, C., Langone, A., Farina, F., MacDonald, C. S., and Saccani, E., 2021. The Bajgan Complex revealed as a Cretaceous ophiolite-bearing subduction complex: A key to unravel the geodynamics of Makran (southeast Iran). Journal of Asian Earth Sciences, 222,104965.
Sabzehei, M., 1974. Les mélanges ophiolitiques de la région d’Esfandageh (Iran méridional). Etude pétrologique et structurale; interprétation dans le cadre Iranien, Ph.D. thesis, 306 pp., Université de Grenoble, Grenoble, France.
Sarkarinejad, K., 1999. Tectonic finite strain analysis using: Ghouri deformed conglomerate, Neyriz area, Southwestern Iran. Iranian Journal of Science and Tecnology. 23, 352–363.
Sarkarinejad, K., and Azizi, A., 2008. Slip partitioning and inclined dextral transpressio along the Zagros Thrust System, Iran. Journal of Structural Geolgy. 30, 116–136.
Sheikholeslami, M.R., 2002. Evolution structurale et métamorphique de la marge sud de la microplaque de l’Iran central: les complexes métamorphiques de la région de Neyriz (zone de Sanandaj-Sirjan), Thèse, université de Brest, 194 p.
Sheikholeslami, R., Bellon, H., Emami, H., Sabzehei, M., and Pique, A., 2003. Nouvelles données structurales et datations 40K/40Ar surles roches métamorphiques de la region de Neyriz (zone de Sanandaj-Sirjan, Iran méridional). Leur intérêt dans le carde du domaine néo-téthysien du Moyen-Orient. C. R. Geosci. 335, 981–991.
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