gtcrustГеодинамика и тектонофизикаGeodynamics & Tectonophysics2078-502XInstitute of the Earth's crust of the Russian Academy of Sciences, Siberian Branch10.5800/GT-2017-8-3-0269gtcrust-410Research ArticleПАЛЕОГЕОДИНАМИКАPALEOGEODYNAMICSPYROXENITE VEINS WITHIN SSZ PERIDOTITES – EVIDENCE OF MELT-ROCK INTERACTION (EGIINGOL MASSIF), MAJOR AND TRACE ELEMENT COMPOSITION OF MINERALSPYROXENITE VEINS WITHIN SSZ PERIDOTITES – EVIDENCE OF MELT-ROCK INTERACTION (EGIINGOL MASSIF), MAJOR AND TRACE ELEMENT COMPOSITION OF MINERALSKarimovA. A.KarimovA. A.

Irkutsk

Irkutsk

GornovaM. A.GornovaM A.

Irkutsk

Irkutsk

BelyaevV. A.BelyaevV. A.

Irkutsk;

Taipei

Irkutsk;

Taipei

A.P. Vinogradov Institute of Geochemistry, Siberian Branch of RASРоссияA.P. Vinogradov Institute of Geochemistry, Siberian Branch of RASRussian FederationA.P. Vinogradov Institute of Geochemistry, Siberian Branch of RAS; Institute of Earth Sciences, Academia SinicaРоссияA.P. Vinogradov Institute of Geochemistry, Siberian Branch of RAS; Institute of Earth Sciences, Academia SinicaRussian Federation20171210201783483488Copyright © Karimov A.A., Gornova M.A., Belyaev V.A., 20172017Karimov A.A., Gornova M.A., Belyaev V.A.Karimov A.A., Gornova M.A., Belyaev V.A.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://www.gt-crust.ru/jour/article/view/410

Evidence of melt-rock reaction between suprasubduction zone (SSZ) peridotites and island arc boninititc and tholeiitic melts are identified. This process is the cause of replacive dunites and pyroxenite veins forming, which are represent the ways of island-arc melts migration. The peridotite-melt interaction is confirmed by compositional features of rocks and minerals. Influence of boninitic melt in peridotites of South Sandwich island arc leads to increasing of TiO2 and Cr-number (Cr#) in spinels [Pearce et al., 2000] e.g. REE patterns of clinopyroxene from Voykar are equilibrium to boninitic melts [Belousov et al., 2009]. We show that pyroxenites are formed sequential, orthopyroxenites are originated firstly, websterites – after, and the main forming process is interaction of SSZ peridotites with percolating boninite-like melts.

Evidence of melt-rock reaction between suprasubduction zone (SSZ) peridotites and island arc boninititc and tholeiitic melts are identified. This process is the cause of replacive dunites and pyroxenite veins forming, which are represent the ways of island-arc melts migration. The peridotite-melt interaction is confirmed by compositional features of rocks and minerals. Influence of boninitic melt in peridotites of South Sandwich island arc leads to increasing of TiO2 and Cr-number (Cr#) in spinels [Pearce et al., 2000] e.g. REE patterns of clinopyroxene from Voykar are equilibrium to boninitic melts [Belousov et al., 2009]. We show that pyroxenites are formed sequential, orthopyroxenites are originated firstly, websterites – after, and the main forming process is interaction of SSZ peridotites with percolating boninite-like melts.

President’s grant programReferencesBelousov I.A., Batanova V.G., Savelieva G.N., Sobolev A.V., 2009. Evidence for the suprasubduction origin of mantle section rocks of Voykar ophiolite, Polar Urals. Doklady Earth Sciences 429 (1), 1394–1398. https://doi.org/10.1134/ S1028334X09080340.Belousov I.A., Batanova V.G., Savelieva G.N., Sobolev A.V., 2009. Evidence for the suprasubduction origin of mantle section rocks of Voykar ophiolite, Polar Urals. Doklady Earth Sciences 429 (1), 1394–1398. https://doi.org/10.1134/ S1028334X09080340.Cameron W.E., 1985. Petrology and origin of primitive lavas from the Troodos ophiolite, Cyprus. Contributions to Mineralogy and Petrology 89 (2), 239–255. https://doi.org/10.1007/BF003794574/S1028334X09080340.Cameron W.E., 1985. Petrology and origin of primitive lavas from the Troodos ophiolite, Cyprus. Contributions to Mineralogy and Petrology 89 (2), 239–255. https://doi.org/10.1007/BF003794574/S1028334X09080340.Gordienko I.V., Filimonov A.V., Minina O.R., Gornova M.A., Medvedev A.Y., Klimuk V.S., Tomurtogoo O., 2007. Dzhida island-arc system in the Paleoasian ocean: structure and main stages of Vendian-Paleozoic geodynamic evolution. Russian Geology and Geophysics 48 (1), 91–106. https://doi.org/10.1016/j.rgg.2006.12.009.Gordienko I.V., Filimonov A.V., Minina O.R., Gornova M.A., Medvedev A.Y., Klimuk V.S., Tomurtogoo O., 2007. Dzhida island-arc system in the Paleoasian ocean: structure and main stages of Vendian-Paleozoic geodynamic evolution. Russian Geology and Geophysics 48 (1), 91–106. https://doi.org/10.1016/j.rgg.2006.12.009.Gornova M.A., Kuz’min M.I., Gordienko I.V., Medvedev A.Y., Al’mukhamedov A.I., 2008. Specific features of the composition of suprasubduction peridotites with reference to the Egiingol massif. Doklady Earth Sciences 421 (1), 782–786. https://doi.org/10.1134/S1028334X08050152.Gornova M.A., Kuz’min M.I., Gordienko I.V., Medvedev A.Y., Al’mukhamedov A.I., 2008. Specific features of the composition of suprasubduction peridotites with reference to the Egiingol massif. Doklady Earth Sciences 421 (1), 782–786. https://doi.org/10.1134/S1028334X08050152.Gornova M.A., Kuz’min M.I., Gordienko I.V., Medvedev A.Y., Al’mukhamedov A.I., 2010. Geochemistry and petrology of the Egiingol peridotite massif: Reconstruction of melting conditions and interaction with the boninite melt. Litosfera (Lithosphere) (5), 20–36 (in Russian).Gornova M.A., Kuz’min M.I., Gordienko I.V., Medvedev A.Y., Al’mukhamedov A.I., 2010. Geochemistry and petrology of the Egiingol peridotite massif: Reconstruction of melting conditions and interaction with the boninite melt. Litosfera (Lithosphere) (5), 20–36 (in Russian).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.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.Johnson K., Dick H.J., Shimizu N., 1990. Melting in the oceanic upper mantle: an ion microprobe study of diopsides in abyssal peridotites. Journal of Geophysical Research: Solid Earth 95 (B3), 2661–2678. https://doi.org/10.1029/ JB095iB03p02661.Johnson K., Dick H.J., Shimizu N., 1990. Melting in the oceanic upper mantle: an ion microprobe study of diopsides in abyssal peridotites. Journal of Geophysical Research: Solid Earth 95 (B3), 2661–2678. https://doi.org/10.1029/ JB095iB03p02661.Kelemen P.B., Hart S.R., Bernstein S., 1998. Silica enrichment in the continental upper mantle via melt/rock reaction. Earth and Planetary Science Letters 164 (1–2), 387–406. https://doi.org/10.1016/S0012-821X(98)00233-7.Kelemen P.B., Hart S.R., Bernstein S., 1998. Silica enrichment in the continental upper mantle via melt/rock reaction. Earth and Planetary Science Letters 164 (1–2), 387–406. https://doi.org/10.1016/S0012-821X(98)00233-7.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.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.Muntener O., Hermann J., Trommsdorf V., 2000. Cooling history and exhumation of lower-crustal granulite and upper mantle (Malenco, Eastern Central Alps). Journal of Petrology 41 (2), 175–200. https://doi.org/10.1093/petrology/ 41.2.175.Muntener O., Hermann J., Trommsdorf V., 2000. Cooling history and exhumation of lower-crustal granulite and upper mantle (Malenco, Eastern Central Alps). Journal of Petrology 41 (2), 175–200. https://doi.org/10.1093/petrology/ 41.2.175.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/0.1093/petroj/39.9.1577.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/0.1093/petroj/39.9.1577.Pawley A.R., 1998. The reaction talc + forsterite = enstatite + H2O: New experimental results and petrological implications. American Mineralogist 83 (1–2), 51–57. https://doi.org/10.2138/am-1998-1-205.Pawley A.R., 1998. The reaction talc + forsterite = enstatite + H2O: New experimental results and petrological implications. American Mineralogist 83 (1–2), 51–57. https://doi.org/10.2138/am-1998-1-205.Pearce J.A., Barker P.F., Edwards S.J., Parkinson I.J., Leat P.T., 2000. Geochemistry and tectonic significance of peridotites from the South Sandwich arc–basin system, South Atlantic. Contributions to Mineralogy and Petrology 139 (1), 36–53. https://doi.org/10.1007/s004100050572.Pearce J.A., Barker P.F., Edwards S.J., Parkinson I.J., Leat P.T., 2000. Geochemistry and tectonic significance of peridotites from the South Sandwich arc–basin system, South Atlantic. Contributions to Mineralogy and Petrology 139 (1), 36–53. https://doi.org/10.1007/s004100050572.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.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.Sobolev A.V., Danyushevsky L.V., 1994. Petrology and geochemistry of boninites from the north termination of the Tonga Trench: constraints on the generation conditions of primary high-Ca boninite magmas. Journal of Petrology 35 (5), 1183–1211. https://doi.org/10.1093/petrology/35.5.1183.Sobolev A.V., Danyushevsky L.V., 1994. Petrology and geochemistry of boninites from the north termination of the Tonga Trench: constraints on the generation conditions of primary high-Ca boninite magmas. Journal of Petrology 35 (5), 1183–1211. https://doi.org/10.1093/petrology/35.5.1183.Sobolev A.V., Migdisov A.A., Portnyagin M.V., 1996. Incompatible element partitioning between clinopyroxene and basalt liquid revealed by the study of melt inclusions in minerals from Troodos lavas, Cyprus. Petrology 4 (3), 307–317.Sobolev A.V., Migdisov A.A., Portnyagin M.V., 1996. Incompatible element partitioning between clinopyroxene and basalt liquid revealed by the study of melt inclusions in minerals from Troodos lavas, Cyprus. Petrology 4 (3), 307–317.Sobolev A.V., Portnyagin M.V., Dmitriev L.V., Tsameryan O.P., Danyushevsky L.V., Kononkova N.N., Schimizu N., Robinson P.T., 1993. Petrology of ultramafic lavas and associated rocks of the Troodos massif, Cyprus. Petrologiya (Petrology) 1 (4), 331–361 (in Russian).Sobolev A.V., Portnyagin M.V., Dmitriev L.V., Tsameryan O.P., Danyushevsky L.V., Kononkova N.N., Schimizu N., Robinson P.T., 1993. Petrology of ultramafic lavas and associated rocks of the Troodos massif, Cyprus. Petrologiya (Petrology) 1 (4), 331–361 (in Russian).Tamura A., Arai S., 2006. Harzburgite–dunite–orthopyroxenite suite as a record of supra-subduction zone setting for the Oman ophiolite mantle. Lithos 90 (1), 43–56. https://doi.org/10.1016/j.lithos.2005.12.012.Tamura A., Arai S., 2006. Harzburgite–dunite–orthopyroxenite suite as a record of supra-subduction zone setting for the Oman ophiolite mantle. Lithos 90 (1), 43–56. https://doi.org/10.1016/j.lithos.2005.12.012.

The authors declare that there are no conflicts of interest present.