PETROGRAPHY AND MINERALOGY OF RETROGRADE METAPERIDOTITES FROM ALAG KHADNY ACCRETIONARY WEDGE (SW MONGOLIA): FLUID MODIFICATION IN SUPRASUBDUCTION ZONE
https://doi.org/10.5800/GT-2017-8-3-0263
Abstract
The Main Mongolian Lineament (MML) separates northern “Caledonian” tectonic province from southern “Hercynian” in SW part of Mongolia of the Central Asian Orogenic Belt (CAOB). The position of Eastern part of MML is widely discussed at recent time, since, this is an important for reconstruction of geodynamic evolution of this region. Some researchers suggest that ophiolite from the Erdene Uul and Maykhan Tsakhir Uul mountain ranges are Eastern part of an ophiolitic nappe system thrust northwards over the Dzabkhan-Baydrag continent, namely the Khantaishir and the Dariv ophiolites [Štípská et al., 2010; Buriánek et al., 2017]. Others have a different view, they suggest that investigated ophiolites refers to Gobi-Altai ophiolite system (523±5 – 518±6 Ma), which likely formed in front of the Gobi Altai microcontinent by initiation of a new southdipping subduction zone following arc–microcontinent collision in Northwest Mongolia [Jian et al., 2014]. However, ophiolites of this critical region of Mongolian the CAOB have not been investigated in detail.
About the Authors
M. A. Gornova
A.P. Vinogradov Institute of Geochemistry, Siberian Branch of RAS
Russian Federation
Irkutsk
Russian Federation
Irkutsk
D. Enkhbat
Institute of Paleontology and Geology, Mongolian Academy of Sciences
Mongolia
Mongolia
Ulaanbaatar
A. A. Karimov
A.P. Vinogradov Institute of Geochemistry, Siberian Branch of RAS
Russian Federation
Irkutsk
Russian Federation
Irkutsk
V. A. Belyaev
A.P. Vinogradov Institute of Geochemistry, Siberian Branch of RAS;
Institute of Earth Sciences, Academia Sinica
Russian Federation
Russian Federation
Irkutsk;
Taipei
O. Gerel
Mongolian University of Science and Technology
Mongolia
Ulaanbaatar
Mongolia
Ulaanbaatar
O. Javkhlan
Mongolian University of Science and Technology
Mongolia
Ulaanbaatar
Mongolia
Ulaanbaatar
References
1. Arai S., 1994. Compositional variation of olivine-chromian spinel in Mg-rich magmas as a guide to their residual spinel peridotites. Journal of Volcanology and Geothermal Research 59 (4), 279–293. https://doi.org/10.1016/0377- 0273(94)90083-3.
2. Bazylev B.A., Silantiev S.A., Kononkova N.N., 1990. Hyperbasite metamorphism at the oceanic crust. In: Yu.M. Pushcharovsky, B.P. Zolotarev (Eds.), Magmatism and tectonics of ocean. Nauka, Moscow, p. 296–318 (in Russian).
3. 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 Research 47, 200–227. https://doi.org/10.1016/j.gr.2016. 09.008
4. Dick H.J.B, Bullen T., 1984. Chromium-spinel as a petrogenetic indicator in abyssal and alpine-type peridotites and spatially associated lavas. Contributions to Mineral Petrology 86, 54–76. https://doi.org/10.1007/BF00373711.
5. Hanžl P. Aichler J., 2007. Geological Survey of the Mongolian Altay at a Scale 1:50000 (Zamtyn nuruu – 50). Final Report. Czech Geological Survey, Prague, Czech Republic, 389 p. Ishii T., 1992. Petrological studies of peridotites from diapiric serpentinite seamounts in the Izu-Ogasawara-Mariana forearc, Leg 125. Proceedings of the Ocean Drilling Program, Scientific Results 125, 445–485. https://doi.org/ 10.2973/odp.proc.sr.125.129.1992.
6. Ishimaru S., Arai S., Ishida Y., Shirasaka M., Okrugin V.M., 2007. Melting and multi-stage metasomatism in the mantle wedge beneath a frontal arc inferred from highly depleted peridotite xenoliths from the Avacha volcano, southern Kamchatka. Journal of Petrology 48 (2), 395–433. https://doi.org/10.1093/petrology/egl065.
7. Jian P., Kröner A., Jahn B., Windley B.F., Shi Y., Zhang W., Zhang F., Miao L., Tomurhuu D., Liu D., 2014. Zircon dating of Neoproterozoic and Cambrian ophiolites in West Mongolia and implications for the timing of orogenic processes in the central part of the Central Asian Orogenic Belt. Earth-Science Reviews 133, 62–93. https://doi.org/10.1016/ j.earscirev.2014.02.006.
8. Khedr M.Z., Arai S., Tamura A., Morishita T., 2010. Clinopyroxenes in high-P metaperidotites from Happo-O'ne, central Japan: implications for wedge-transversal chemical change of slab-derived fluids. Lithos 119 (3), 439–456. https://doi.org/10.1016/j.lithos.2010.07.021.
9. Padrón-Navarta J.A., Hermann J., Garrido C. J., Sánchez-Vizcaíno V.L., Gómez-Pugnaire M.T., 2010. An experimental investigation of antigorite dehydration in natural silica-enriched serpentinite. Contributions to Mineralogy and Petrology 159 (1), 25–42. https://doi.org/10.1007/s00410-009-0414-5.
10. Parkinson I.J., Pearce J.A., 1998. Peridotites from the Izu–Bonin–Mariana forearc (ODP Leg 125): evidence for mantle melting and melt–mantle interaction in a supra-subduction zone setting. Journal of Petrology 39 (9), 1577–1618. https://doi.org/10.1093/petroj/39.9.1577.
11. Säntti J., Kontinen A., Sorjonen-Ward P., Johanson B., Pakkanen L., 2006. Metamorphism and chromite in serpentinized and carbonate-silica-altered peridotites of the Paleoproterozoic Outokumpu-Jormua Ophiolite Belt, Eastern Finland. International Geology Review 48 (6), 494–546. https://doi.org/10.2747/0020-6814.48.6.494.
12. 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. Journal of Metamorphic Geology 28 (9), 915–933. https://doi.org/10.1111/j.1525-1314.2010.00899.x.
Review
For citations:
Gornova M.A., Enkhbat D., Karimov A.A., Belyaev V.A., Gerel O., Javkhlan O. PETROGRAPHY AND MINERALOGY OF RETROGRADE METAPERIDOTITES FROM ALAG KHADNY ACCRETIONARY WEDGE (SW MONGOLIA): FLUID MODIFICATION IN SUPRASUBDUCTION ZONE. Geodynamics & Tectonophysics. 2017;8(3):465-469. https://doi.org/10.5800/GT-2017-8-3-0263
Views:
872
Email this article 