ГОВЬ-АЛТАЙ АЙМАГ, ЧАНДМАНЬ СУМЫН НУТАГТ ОРШИХ АККРЕЦЫН КОМПЛЕКСЫН ГРАНАТАТ АМФИБОЛИТ, АМФИБОЛИТЫН МЕТАМОРФИЗМ
Keywords:
amphibolite , mélange zone , Lake ZoneAbstract
The eclogite-, ophiolite-, and serpentinite-bearing accretionary complex in the Lake Zone, SW Mongolia occupies the central region of the Central Asian Orogenic Belt. The complex consists mainly of orthogneisses intercalated with eclogites and amphibolite in a mélange zone. Most of eclogites are strongly amphibolitized. In this study, we examined petrography and mineral chemistry of amphibolite and newly found garnet amphibolite within marble. The result of our research shows that metamorphic P-T gradient of Chandman accretionary complex is now can be characterized as low-pressure LT ophiolite zone from the north and medium-pressure MT to HT zones of eclogite-, garnet amphiboliteand serpentinite-bearing units to the south contact with Zamtyn Nuruu basement block. This P-T gradient indicates typical Barrovian-type regional metamorphism.
Downloads
References
Badarch, G.; Cunningham, W.D., Windley, B.F., 2002. A new terrane subdivision for Mongolia: Implications for the Phanerozoic crustal growth of Central Asia. J. Asian Earth Sci., 21, 87–110.
Burenjargal, U., Okamoto, A., Kuwatani, T., Sakata, S., Hirata, T., & Tsuchiya, N., 2014. Thermal evolution of the T seel terrane, SW Mongolia and its relation to granitoid intrusions in the C entral A sian O rogenic B elt. Journal of Metamorphic Geology, 32(7), 765-790.
Buriánek, D.; Schulmann, K.; Hrdličková, K.; Hanžl, P.; Janoušek, V.; Gerdes, A.; Lexa, O., 2017. Geochemical and geochronological constraints on distinct Early-Neoproterozoic and Cambrian accretionary events along southern margin of the Baydrag Continent in western Mongolia. Gondwana Res. 47, 200–227.
Holland, T.; Blundy, J.,1994. Non-ideal interactions in calcic amphiboles and their bearing on amphibole-plagioclase thermometry. Contrib. Miner. Pet. 116, 433–447.
Hrdličková, K.; Gerdes, A.; Gilikova, H.; Bat-Ulzii, D.; Hanzl, P., 2010. Burd Gol Granite Massif as a product of the Late Cambrian post-orogenic magmatism in the SE part of the Lake Zone, Gobi Altay, SW Mongolia. J. Geosci. 55, 369–386.
Jahn, B.-M.; Windley, B.; Natal’In, B.; Dobretsov, N., 2004. Phanerozoic continental growth in Central Asia. J. Asian Earth Sci. 23, 599–603.
Jahn, B.-M.; Wu, F.; Chen, B., 2000. Granitoids of the Central Asian Orogenic Belt and continental growth in the Phanerozoic. Earth Environ. Sci. Trans. R. Soc. Edinb. 91, 181–193.
Janoušek, V., Jiang, Y., Burianek, D., Schulmann, K., Hanžl, P., Soejono, I., ... & Ganchuluun, T., 2018. Cambrian– ordovician magmatism of the Ikh-Mongol Arc system exemplified by the Khantaishir Magmatic Complex (Lake Zone, south–central Mongolia). Gondwana Research, 54, 122-149.
Javkhlan, O., Takasu, A., Kabir, M.F., Skuzovatov, S., 2017. Geochemical characteristics of metatuffs and metabasalts of ophiolite complex of Khantaishir formation, lake zone, SW Mongolia, Mongolian Geosientist, 46
Javkhlan, O.; Takasu, A.; Bat-Ulzii, D.; Kabir, M.F., 2013. Metamorphic pressure-temperature evolution of garnet-chloritoid schists from the Lake Zone, SW Mongolia. J. Miner. Pet. Sci.108, 255–266.
Javkhlan, O.; Takasu, A.; Kabir, M.F.; Bat-Ulzii, D., 2014. K-Ar ages of amphibole-rich metamorphosed veins in eclogite bodies from the Lake Zone, SW Mongolia. Earth Sci. (Chikyu Kagaku) 68, 89–96.
Javkhlan, T. O., Takasu, A., Kabir, M. F., & Batulzii, D., 2019. Multiple Metamorphic Events Recorded within Eclogites of the Chandman District, SW Mongolia. Minerals, 9(8), 495.
Jiang, Y. D., Schulmann, K., Kröner, A., Sun, M., Lexa, O., Janoušek, V., ... & Hanžl, P., 2017. Neoproterozoic‐Early Paleozoic Peri‐Pacific Accretionary Evolution of the Mongolian Collage System: Insights From Geochemical and U‐Pb Zircon Data From the Ordovician Sedimentary Wedge in the Mongolian Altai. Tectonics, 36(11), 2305-2331.
Kröner, A.; Lehmann, J.; Schulmann, K.; Demoux, A.; Lexa, O.; Tomurhuu, D.; Štípská, P.; Liu, D.; Wingate, M.T.D., 2010. Lithostratigraphic and geochronological constraints on the evolution of the Central Asian Orogenic Belt in SW Mongolia: Early Paleozoic rifting followed by late Paleozoic accretion. Am. J. Sci. 310, 523–574.
Lehmann, J., Schulmann, K., Lexa, O., Corsini, M., Kröner, A., Štípská, P., ... & Otgonbator, D., 2010. Structural constraints on the evolution of the Central Asian Orogenic Belt in SW Mongolia. american Journal of Science, 310(7), 575-628.
Maruyama, S.; Suzuki, K.; Liou, J.G., 1983. Greenschist-Amphibolite Transition Equilibria at Low Pressures. J. Pet., 24, 583–604.
Molina, J. F., Moreno, J. A., Castro, A., Rodríguez, C., & 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, 286-305.
Mossakovsky, A., 1994. Central Asian fold belt: Geodynamic evolution and formation history. Geotectonics 24, 445– 474.
Schulmann, K., & Paterson, S., 2011. Asian continental growth. Nature Geoscience, 4(12), 827-829.
Skuzovatov, S.Y.; Shatsky, V.S.; Dril, S.I.; Perepelov, A.B., 2017. Elemental and isotopic (Nd-Sr-O) geochemistry of eclogites from the Zamtyn-Nuruu area (SW Mongolia): Crustal contribution and relation to Neoproterozoic subduction-accretion events. J. Asian Earth Sci. 167, 33–51.
Štípská, P.; Schulmann, K.; Lehmann, J.; Corsini, M.; Lexa, O.; Tomurhuu, D., 2010. Early Cambrian eclogites in SW Mongolia: Evidence that the Palaeo- Asian Ocean suture extends further east than expected. J. Metamorph. Geol. 28, 915–933.
Xiao, W. J., Sun, M., & Santosh, M., 2015. Continental reconstruction and metallogeny of the Circum-Junggar areas and termination of the southern Central Asian Orogenic Belt. Geoscience Frontiers, 6(2), 137-140.
Xiao, W., Kröner, A., & Windley, B., 2009. Geodynamic evolution of Central Asia in the Paleozoic and Mesozoic.
Xiao, W., Windley, B. F., Han, C., Liu, W., Wan, B., Zhang, J. E., ... & Song, D., 2018. Late Paleozoic to early Triassic multiple roll-back and oroclinal bending of the Mongolia collage in Central Asia. Earth- Science Reviews, 186, 94-128.
Downloads
Published
How to Cite
Issue
Section
License
Copyright (c) 2022 Геологийн асуудлууд
This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.
