شیمی کانی و زمین دما-‌فشارسنجی متابازیت های مجموعه آذرین-‌دگرگونی ماجراد (جنوب شرق شاهرود)

نوع مقاله : علمی- پژوهشی

نویسندگان

1 دانشگاه صنعتی شاهرود

2 مؤسسه زمین شناسی و ژئوفیزیک آکادمی علوم چین

چکیده

مجموعه دگرگونی-‌آذرین ماجراد به سن نئوپروتروزوئیک ­پسین، در جنوب­شرق شاهرود و شمال پهنه ساختاری ایران­ مرکزی رخنمون دارد که طیف وسیعی از سنگ­ های آذرین و دگرگونی را شامل می ­شود. متابازیت ­های این مجموعه متشکل از آکتینولیت­شیست، آمفیبولیت و گارنت­آمفیبولیت هستند. آمفیبول، پلاژیوکلاز و گارنت کانی­ های اصلی این سنگ­ ها هستند. آمفیبول­ های متابازیت­ های این مجموعه به گروه­ کلسیم­ دار تعلق دارند. ترکیب آمفیبول­ در آکتینولیت­شیست­ ها آکتینولیت و منیزیوهورنبلند و در آمفیبولیت­ ها منیزیو‌هورنبلند و چرماکیت است. پلاژیوکلازها اغلب دارای ترکیب الیگوکلاز، لابرادوریت تا بیتونیت هستند. با استفاده از دما‌-‌فشارسنجی زوج هورنبلند‌-‌پلاژیوکلاز، دمای تعادلی 450 تا 690 درجه سانتی­ گراد و فشار 4 تا 11 کیلوبار برای آمفیبولیت ­های مجموعه آذرین‌-‌دگرگونی ماجراد برآورد شده است. این شرایط دما‌-‌فشار با شرایط رخساره آمفیبولیت در رژیم دگرگونی نوع بارروین متعارف مطابقت می­ کند.

کلیدواژه‌ها


Andersen, D.J. and Lindsley, D.H., 1988. Internally consistent solution models for Fe-Mg-Mn-Ti oxides: Fe-Ti oxides. American Mineralogist, 73(7–8): 714–726.
Anderson, J.L. and Smith, D.R., 1995. The effects of temperature and ƒO2 on the Al-in-hornblende
barometer. American Mineralogist, 80(5): 549–559.
Balaghi Einalou, M., Sadeghian, M., Ghasemi, H., Mohajjel, M. and Omrani, H., 2015. Petrology, Thermo barometry and U-Pb datig of the Metapelites of Delbar Complex Biarjomand (SE of Shahrood). Petrology, 21(6): 55–82. (in Persian with English abstract)
Balaghi Einalou, M., Sadeghian, M., Ghasemi, H., Zhai, M.G., and Mohajjel, M., 2014. Zircon U–Pb ages, Hf isotopes and geochemistry of the schists, gneisses and granites in Delbar Metamorphic-Igneous Complex, SE of Shahrood (Iran): implications for Neoproterozoic geodynamic evolutions of central Iran. Journal of Asian Earth Sciences, 92(13): 92–124.
Baluchi, S., Sadeghian1, M., Ghasemi, H., Zhai M., Li, Ch. and Yanbin, Z., 2018. Mineral chemistry, geochronology and isotopic geochemistry Rb-Sr, Sm- Nd of Ayrakan granite. Kharazmi Journal of Earth Sciences, 3(2): 139–160. (in Persian with English abstract)
Bayat, F. and Torabi, Gh., 2012. Lithology of metabasites of the South of Arousan (NE of Esfahan). Journal of Economic Geology, 4(2): 271–284. (in Persian with English abstract)
Beattie, P., 1993. Olivine-melt and orthopyroxene-melt equilibria. Contributions to Mineralogy and Petrology, 115(1): 103–111.
Bucher, K. and Grapes, R., 2011. Petrogenesis of metamorphic rocks. Springer-Verlag, Berlin-Heiderberg, 441 pp.
Deer, W. A., Howie, R.A. and Zussman, J., 1966. An introduction to the rock forming minerals. Longman Scientific and Technical, USA, 528 pp.
Ernst, W.G. and Liu J., 1998. Experimental phaseequilibrium study of Al-and Ti-contents of calcic amphibole in MORB-A semiquantitative thermobarometer. American Mineralogist, 83(9–10): 952–969.
Faramarzi, N., Amini, S., Schmitt, A., Hassanzadeh, J., Borg, G., McKeegan, K., Razavi, S.M. and Mortazavi, S.M., 2015. Geochronology and geochemistry of rhyolites from Hormuz Island, southern Iran: A new record of Cadomian arc magmatism in the Hormuz Formation. Lithos, 236–237(1): 203–211.
Graham, C. and Powell, R., 1984. A garnet-hornblende geothermometer: calibration, testing, and application to the Pelona Schist, Southern California. Journal of Metamorphic Geology, 2(1): 13–31.
Hammerstrom, J.M. and Zen, E., 1986. Aluminum in hornblende: an empirical igneous geobarometer. American Mineralogist, 71(11–12): 1297–1313.
Hassanzadeh, J., Stockli, D., Horton, B., Axen, G., Stockli, L., Grove, M., Shmitt, A. and Walker, D., 2008. U-Pb zircon geochronology of late Neoprotrozoic –Early Cambrian granitoids in Iran: Implications for paleogeographym magmatism, and exhumation history of Iranian basement. Thectonophysics, 452(1–4): 71–96.
Helz, R.T., 1979. Alkali exchange between hornblende and melt: a temperature-sensitive reaction.
American Mineralogist, 64(9): 953–965.
Holland, T. and Blundy, J., 1994. Non-ideal interactions in calcic amphiboles and their bearing on amphibole-plagioclase thermometry. Contributions to Mineralogy and Petrology, 116(4): 433–447.
Hollister, L.S., Grissom, G.E., Peters, E.K., Stowell, H.H. and Sisson, V.R., 1987. Confirmation of the
empirical correlation of Al in hornblende with pressure of solidification of calc-alkaline plutons.
American Mineralogist, 72(3–4): 231–239.
Hosseini, S.H., Sadeghian, M., Zhai, M. and Ghasemi, H., 2015. Petrology, geochemistry and zircon U–Pb dating of Band-e-Hezar Chah metabasites (NE Iran): An evidence for back-arc magmatism along the northern active margin of Gondwana. Chemie der Erde, 75(2): 207–218.
Johnson, M.C. and Rutherford, M.J., 1989. Experimental calibration of an aluminum-in-hornblende geobarometer with application to Long Valley caldera (California) volcanic rocks. Geology, 17(9): 837–841.
Keyghobadi, F., 2017. Geochemistry and geochronology of the metabasites from the Posht-e-Badam region, Central Iran. M.Sc thesis, Damghan University, Damghan, Iran, 115 pp.
Kohn, M.J. and Spear, F.S., 1990. Two new geobarometers for garnet amphibolites, with applications to southeastern Vermont. American Mineralogist, 75(1): 89–96.
Kretz, R., 1983. Symbols for Rock-Forming Minerals. American Mineralogist, 68(1): 277–279.
Leake, B.E., 1965. The relationship between tetrahedral aluminum and the maximum possible octahedral aluminum in natural calciferous and subcalciferous amphiboles. American Mineralogist, 50(7–8): 843– 851.
Leake, B.E., Woolley, A.R., Arps, C.E.S., Birch, W.D., Gilbert, M.C., Grice, J.D., Hawthorne, F.C., Kato, A., Kisch, H.J., Krivovichev, V.G., Linthout, K., Laird, J., Mandarino, J., Maresch, W.V., Nickel, E.H., Schumaker, J.C., Smith, D.C., Stephenson, N.C.N., Ungaretti, L., Whittaker, E.J.W. and Youzhi, G., 1997. Nomenclature of amphiboles: report of the subcommittee on amphiboles of the International Mineralogical Association Commission on New Minerals and Mineral Names. The Canadian Mineralogist, 35(1): 219–246.
Malekpour-Alamdari, A., Axen, G., Heizler, M. and Hassanzadeh, J., 2017. Large-magnitude continental extension in the northeastern Iranian Plateau: Insight from K-feldspar 40Ar/39Ar thermochronology from the Shotor Kuh–Biarjmand metamorphic core complex. Geosphere, 13(4): 1207–1233.
Martin, R.F., 2007. Amphiboles in the igneous environment. Reviews in Mineralogy and
Geochemistry, 67(1):323–358.
Molina, J.F., Moreno, J.A., Castro, A., Rodriguez, C. and Fershtater, G.B., 2015. Calcic amphibole thermobarometry in metamorphic and igneous rocks: New calibrations based on plagioclase/amphibole Al-Si partitioning and amphibole/liquid Mg partitioning. Lithos, 232(6): 286–305.
Monazzami Bagherzadeh, R., Karimpour, M.H., Lang Farmer, G., Stern, C.R., Santos, J.F., Ribirro, S., Rahimi, B. and Heidarian Shahri, M.R., 2016. U–Pb zircon geochronology, petrography, geochemistry and radioisotopes of metarhyolites of the Bornaward Complex (Bardaskan-NE Iran). Journal of Economic Geology, 8(1): 239–264. (in Persian with English abstract)
Pearce, J.A., 1976. Statistical analyses of major element patterns in basalts. Journal of Petrology, 17(1): 15–43.
Poli, S. and Schmidt, M.W., 1992. A comment on calcic amphibole equilibria and a new amphibole-plagioclase geothermometer. Contributions to Mineralogy and Petrology, 111(2): 273–278.
Putirka, K.D., 2008. Thermometers and barometers for volcanic systems. Reviews in Mineralogy and
Geochemistry, 69(1): 61–120.
Putirka, K.D., 2016. Amphibole thermometers and barometers for igneous systems and some implications for eruption mechanisms of felsic magmas at arc volcanoes. American Mineralogist, 101(4): 841–858.
Rahmati Ilkhchi, M., Faryad, S.W., Holub, F.V., Kosler, J. and Frank, W., 2011. Magmatic and metamorphic evolution of the Shotur Kuh Metamorphic Complex (central Iran). International Journal of Earth Sciences, 100(1): 45–62.
Ridolfi, F. and Renzulli, A., 2012. Calcic amphiboles in calc-alkaline and alkaline magmas: thermobarometric and chemometric empirical equations valid up to 1130°C and 2.2 GPa. Contributions to Mineralogy and Petrology, 163(5): 877–895.
Ridolfi, F., Renzulli, A. and Puerini, M., 2010. Stability and chemical equilibrium of amphibole in calc-alkaline magmas: an overview, new thermobarometric formulations and application to subduction- related volcanoes. Contributions to Mineralogy and Petrology, 160(1): 45–66.
Robinson, P., 1982. Chapter 1, Phase relations of metamorphic amphiboles; natural occurrence and theory; Internal limits in amphibole composition space; coexisting amphiboles; calcic amphiboles and orthoamphiboles; exsolution lamellae. Reviews in Mineralogy and Geochemistry, 9B(1): 62–63.
Schmidt, M.W., 1992. Amphibole composition in tonalite as a function of pressure: an experimental
calibration of the Al in hornblende barometer. Contributions to Mineralogy and Petrology, 110
(2–3): 304–310.
Shekari, S., Sadeghian, M., Zhai, M., Ghasemi, H. and Zou, Y., 2017. Mineral chemistry and petrogenesis of metabasites of metamorphic - igneous Shotor-Kuh complex (SE Shahrood) an indicator for evolution of intracontinental extensional basins of late Neoproterozoic. Geosciences, 27(105): 167–182. (in Persian with English abstract)
Spear, F.S., 1993. Metamorphic phase equilibria and pressure-temperature-time paths. Monograph (Mineralogical Society of America), America, 799 pp.
Stein, E. and Dietl, C., 2001. Hornblende thermobarometry of granitoids from the Central Odenwald (Germany) and their implications for the geotectonic development of Odenwald. Mineralogy and petrology, 72(1–3): 185–207.
Veiskarami, M., Sadeghian, M., Ghasemi, H. and Zhai, M., 2018a. Majerad gabbrodiorites in the southeast of Shahrood: An evidence to the starting of opening of the supra-subduction basin of the Sabzevar Neotethyian branch in the middle Jurassic. Kharazmi Journal of Earth Sciences, in press. (In Persian with English abstract).
Veiskarami, M., Sadeghian, M., Ghasemi, H. and Zhai, M., 2018b. Petrology, geochemistry and dating of the Late Neoproterozoic metabasites of the Majerad metamorphic complex (SE of Shahrood): One step to understanding of the geodynamic evolutions of Iranian Gondawanan terranes. Iranian Journal Crystallography and Mineralogy, 27(1): 191–206. (in Persian with English abstract)
Veiskarami, M., Sadeghian, M. and Shekari, S., 2017. Geochronology of late Neoprotrozoic granitoids of the north Kandu sheepcote (South Do Chah – Southeast Shahrood), 24th symposium of crystallography and mineralogy of Iran, Shahrood University of Technology, Shahrood, Iran.
Winter, J.D., 2001. An introduction to igneous and metamorphic petrology. Prentice Hall, New Jersey, 697 pp.
Wu, C., Zhang, J. and Ren, L., 2004. Empirical Garnet-Biotite- Plagioclase-Quartz (GBPQ) geobarometry in medium to high-grade metapelites. Journal of Petrology, 45(9):1907–1921.
Zenk, M. and Schulz, B., 2004. Zoned Ca-amphiboles and related P-T evolution in metabasites from the classical Barrovian metamorphic zones in Scotland. Mineralogical Magazine, 68(5): 769–786.
CAPTCHA Image