gtcrustГеодинамика и тектонофизикаGeodynamics & Tectonophysics2078-502XInstitute of the Earth's crust of the Russian Academy of Sciences, Siberian Branch10.5800/GT-2024-15-5-0780XESWVTgtcrust-1916Research ArticleПАЛЕОГЕОДИНАМИКАPALEOGEODYNAMICSТЕРМОБАРОМЕТРИЯ ДЕПЛЕТИРОВАННЫХ ПЕРИДОТИТОВTHERMOBAROMETRY OF DEPLETED PERIDOTITEShttps://orcid.org/0000-0002-2216-0553ПохиленкоЛ. Н.PokhilenkoL. N.

630090, Новосибирск, пр-т Академика Коптюга, 3

3 Academician Koptyug Ave, Novosibirsk 630090 

https://orcid.org/0009-0007-5717-4422КоролюкВ. Н.KorolyukV. N.

630090, Новосибирск, пр-т Академика Коптюга, 3

3 Academician Koptyug Ave, Novosibirsk 630090 

https://orcid.org/0000-0002-3207-1458ПохиленкоН. П.PokhilenkoN. P.

630090, Новосибирск, пр-т Академика Коптюга, 3

630090, Новосибирск, ул. Пирогова, 1 

3 Academician Koptyug Ave, Novosibirsk 630090 

1 Pirogov St, Novosibirsk 630090 

Институт геологии и минералогии им. В.С. Соболева СО РАНРоссияSobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of SciencesRussian FederationИнститут геологии и минералогии им. В.С. Соболева СО РАН ; Новосибирский государственный университетРоссияSobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences ; Novosibirsk State UniversityRussian Federation202418102024155780780Copyright © Похиленко Л.Н., Королюк В.Н., Похиленко Н.П., 20242024Похиленко Л.Н., Королюк В.Н., Похиленко Н.П.Pokhilenko L.N., Korolyuk V.N., Pokhilenko N.P.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/1916

Проведена оценка возможности использования оливиновой термобарометрии для ксенолитов деплетированных перидотитов из трубки Удачной (Якутия), представленных 76 мегакристаллическими дунитами и 5 мегакристаллическими гарцбургитами. По специально разработанной и проверенной методике с помощью микрозондового анализа определены микропримеси Al и Ca в оливинах исследуемых образцов. РТ-параметры ксенолитов мегакристаллических дунитов рассчитаны по уравнениям оливиновых, гранатовых, оливин-гранатовых термобарометров. Для нескольких мегакристаллических гарцбургитов дополнительно использовались энстатитовые геобарометры. Произведенное сравнение полученных данных показало, что наиболее подходящей для оценки РТ-параметров изученной коллекции мегакристаллических дунитов оказывается геотермобарометрическая пара барометр Финнерти-Риджена (Са в оливине) для перидотитов широкого диапазона РТ и термометр [Bussweiler et al., 2017] (Al в оливине) для гранатовых перидотитов, хотя небольшая часть данных из области высоких РТ (>60 кбар и 1200 °С) вызывает сомнение. Гранатовый барометр [Grütter et al., 2006] (соотношение СаО – Cr2O3 в пиропе) не всегда согласуется с оливиновыми геотермометрами. Это может быть связано с необходимостью корректировки уравнений барометра для более широкого спектра составов, а также с возможным нарушением равновесия между гранатом и оливином. Авторы допускают, что более точные результаты могут быть получены при использовании этого барометра в сочетании с гранатовыми термометрами, основанными на определении Ni в гранате. Для серьезных выводов данных по гарцбургитам недостаточно. Однако следует признать, что традиционная пара энстатитового барометра Макгрегора и гранат-оливинового термометра O’Нейл-Вуда пока остается наиболее приемлемой для оценки РТ-параметров мегакристаллических гарцбургитов, хотя и с некоторым занижением температур.

An assessment was made of the possibility of using olivine thermobarometry for xenoliths of depleted peridotites from the Udachnaya pipe (Yakutia), represented by 76 megacrystalline dunites and 5 megacrystalline harzburgites. Specially developed and tested method of microprobe analysis was used to determine Al and Ca microimpurities in the olivine samples studied. PT-parameters of megacrystalline dunite xenoliths were calculated using the equations of olivine, garnet, and olivine-garnet thermobarometers. Enstatite geobarometers were additionally used for some megacrystalline harzburgites. Comparison of the obtained data showed that the geothermobarometric pair of FinnertyRigden barometer (Ca in olivine) for wide PT-range peridotites and thermometer [Bussweiler et al., 2017] (Al in olivine) for garnet peridotites is most suitable for assessing the PT-parameters of the megacrystalline dunite collection studied, though some of the high PT-parameters (>60 kbar and 1200 °C) are questionable. Garnet barometer [Grütter et al., 2006] (CaO – Cr2O3 ratio in pyrope) does not always agree with olivine geothermometers. This may be caused by the necessity to adjust the barometer equations for a wider range of compositions, as well as by the possible imbalance between garnet and olivine. We admit that more accurate results can be obtained by using this barometer in combination with garnet thermometers based on the determination of Ni in garnet. There is not enough data on harzburgites to draw certain conclusions. However, it should be recognized that the traditional pair of McGregor enstatite barometer and O’Neill-Wood garnet-olivine thermometer still remains the most acceptable for estimating the PT-parameters of megacrystalline harzburgites, though with some temperature underestimation.

геобарометргеотермометроливинмегакристаллические дунитымегакристаллические гарцбургитымикропримеситрубка Удачнаяgeobarometergeothermometerolivinemegacrystalline dunitesmegacrystalline harzburgitesmicroimpuritiesUdachnaya pipeРабота выполнена по государственному заданию ИГМ СО РАН (№ 122041400157-9).The work was carried as part of the state assignment of the IGM SB RAS (122041400157-9).ReferencesBussweiler Y., Brey G.P., Pearson D.G., Stachel T., Stern R.A., Hardman M.F., Kjarsgaard B.A., Jackson S.E., 2017. The Aluminum-in-Olivine Thermometer for Mantle Peridotites – Experimental versus Empirical Calibration and Potential Applications. Lithos 272–273, 301–314. https://doi.org/10.1016/j.lithos.2016.12.015.Bussweiler Y., Brey G.P., Pearson D.G., Stachel T., Stern R.A., Hardman M.F., Kjarsgaard B.A., Jackson S.E., 2017. The Aluminum-in-Olivine Thermometer for Mantle Peridotites – Experimental versus Empirical Calibration and Potential Applications. Lithos 272–273, 301–314. https://doi.org/10.1016/j.lithos.2016.12.015.De Hoog J.C.M., Gall L., 2005. Trace Element Geochemistry of Mantle Olivine and Its Application to Geothermometry. Ofioliti 30 (2), 182–183.De Hoog J.C.M., Gall L., 2005. Trace Element Geochemistry of Mantle Olivine and Its Application to Geothermometry. Ofioliti 30 (2), 182–183.De Hoog J.C.M., Gall L., Cornell D.H., 2010. Trace-Element Geochemistry of Mantle Olivine and Application to Mantle Petrogenesis and Geothermobarometry. Chemical Geology 270 (1–4), 196–215. https://doi.org/10.1016/j.chemgeo.2009.11.017.De Hoog J.C.M., Gall L., Cornell D.H., 2010. Trace-Element Geochemistry of Mantle Olivine and Application to Mantle Petrogenesis and Geothermobarometry. Chemical Geology 270 (1–4), 196–215. https://doi.org/10.1016/j.chemgeo.2009.11.017.Ellis D.J., Green D.H., 1979. An Experimental Study of the Effect of Ca upon Garnet-Clinopyroxene Fe-Mg Exchange Equilibria. Contributions to Mineralogy and Petrology 71, 13–22. https://doi.org/10.1007/BF00371878.Ellis D.J., Green D.H., 1979. An Experimental Study of the Effect of Ca upon Garnet-Clinopyroxene Fe-Mg Exchange Equilibria. Contributions to Mineralogy and Petrology 71, 13–22. https://doi.org/10.1007/BF00371878.Finnerty A.A., Boyd F.R., 1987. Thermobarometry for Garnet Peridotites: Basis for the Determination of Thermal and Compositional Structure of the Upper Mantle. In: P.H. Nixon (Ed.), Mantle Xenoliths. Wiley-Interscience, New York, p. 381–402.Finnerty A.A., Boyd F.R., 1987. Thermobarometry for Garnet Peridotites: Basis for the Determination of Thermal and Compositional Structure of the Upper Mantle. In: P.H. Nixon (Ed.), Mantle Xenoliths. Wiley-Interscience, New York, p. 381–402.Finnerty A.A., Rigden S.M., 1981. Olivine Barometry Application to Pressure Estimation for Terrestrial and Lunar Rocks. Lunar and Planetary Science XII, 279–281.Finnerty A.A., Rigden S.M., 1981. Olivine Barometry Application to Pressure Estimation for Terrestrial and Lunar Rocks. Lunar and Planetary Science XII, 279–281.Grütter H.S., Latti D., Menzies A., 2006. Cr-Saturation Arrays in Concentrate Garnet Compositions from Kimberlite and Their Use in Mantle Barometry. Journal of Petrology 47 (4), 801–820. https://doi.org/10.1093/petrology/egi096.Grütter H.S., Latti D., Menzies A., 2006. Cr-Saturation Arrays in Concentrate Garnet Compositions from Kimberlite and Their Use in Mantle Barometry. Journal of Petrology 47 (4), 801–820. https://doi.org/10.1093/petrology/egi096.Harley S.L., 1984. An Experimental Study of the Partitioning of Fe and Mg between Garnet and Orthopyroxene. Contributions to Mineralogy and Petrology 86, 359–373. https://doi.org/10.1007/BF01187140.Harley S.L., 1984. An Experimental Study of the Partitioning of Fe and Mg between Garnet and Orthopyroxene. Contributions to Mineralogy and Petrology 86, 359–373. https://doi.org/10.1007/BF01187140.Kennedy C.S., Kennedy G.C., 1976. The Equilibrium Boundary Between Graphite and Diamond. Journal of Geophysical Research 81 (14), 2467–2470. https://doi.org/10.1029/JB081i014p02467.Kennedy C.S., Kennedy G.C., 1976. The Equilibrium Boundary Between Graphite and Diamond. Journal of Geophysical Research 81 (14), 2467–2470. https://doi.org/10.1029/JB081i014p02467.Korolyuk V.N., Lavrent’ev Y.G., Usova L.V., Nigmatulina E.N., 2008. JXA-8100 Microanalyzer: Accuracy of Analysis of Rock-Forming Minerals. Russian Geology and Geophysics 49 (3), 165–168. https://doi.org/10.1016/j.rgg.2007.07.005.Korolyuk V.N., Lavrent’ev Y.G., Usova L.V., Nigmatulina E.N., 2008. JXA-8100 Microanalyzer: Accuracy of Analysis of RockForming Minerals. Russian Geology and Geophysics 49 (3), 165–168. https://doi.org/10.1016/j.rgg.2007.07.005.Korolyuk V.N., Pokhilenko L.N., 2016. Electron Probe Determination of Trace Elements in Olivine: Thermometry of Depleted Peridotites. Russian Geology and Geophysics 57 (12), 1750–1758. https://doi.org/10.1016/j.rgg.2016.04.011.Korolyuk V.N., Pokhilenko L.N., 2016. Electron Probe Determination of Trace Elements in Olivine: Thermometry of Depleted Peridotites. Russian Geology and Geophysics 57 (12), 1750–1758. https://doi.org/10.1016/j.rgg.2016.04.011.McGregor I.D., 1974. The System MgO-SiO2-Al2O3: Solubility of Al2O3 in Enstatite for Spinel and Garnet Peridotite Compositions. American Mineralogist 59, 110–119.McGregor I.D., 1974. The System MgO-SiO2-Al2O3: Solubility of Al2O3 in Enstatite for Spinel and Garnet Peridotite Compositions. American Mineralogist 59, 110–119.O’Neill H.S.C., Wood B.J., 1979. An Experimental Study of Fe-Mg Partitioning between Garnet and Olivine and Its Calibration as a Geothermometer. Contributions to Mineralogy and Petrology 70, 59–70. https://doi.org/10.1007/BF00371872.O’Neill H.S.C., Wood B.J., 1979. An Experimental Study of Fe-Mg Partitioning between Garnet and Olivine and Its Calibration as a Geothermometer. Contributions to Mineralogy and Petrology 70, 59–70. https://doi.org/10.1007/BF00371872.Pokhilenko N.P., Sobolev N.V., 1995. Mineralogical Criteria for Kimberlite Diamond Grade. In: Sobolev N.V., Zuev V.M., Pokhilenko N.P., Zinchuk N.N. (Eds), Kimberlites of Yakutia. Field Guide Book. Sixth International Kimberlite Conference. Novosibirsk, p. 79–81.Pokhilenko N.P., Sobolev N.V., 1995. Mineralogical Criteria for Kimberlite Diamond Grade. In: Sobolev N.V., Zuev V.M., Pokhilenko N.P., Zinchuk N.N. (Eds), Kimberlites of Yakutia. Field Guide Book. Sixth International Kimberlite Conference. Novosibirsk, p. 79–81.Pokhilenko N.P., Sobolev N.V., Boyd F.R., Pearson D.G., Shimizu N., 1993. Megacrystalline Pyrope Peridotites in the Lithosphere of the Siberian Platform: Mineralogy, Geochemical Peculiarities and the Problem of Their Origin. Russian Geology and Geophysics 34 (1), 71–84.Pokhilenko N.P., Sobolev N.V., Boyd F.R., Pearson D.G., Shimizu N., 1993. Megacrystalline Pyrope Peridotites in the Lithosphere of the Siberian Platform: Mineralogy, Geochemical Peculiarities and the Problem of Their Origin. Russian Geology and Geophysics 34 (1), 71–84.Pollack H.N., Chapman D.S., 1977. On the Regional Variation of Heat Flow, Geotherms and Lithospheric Thickness. Tectonophysics 38 (3–4), 279–296. https://doi.org/10.1016/0040-1951(77)90215-3.Pollack H.N., Chapman D.S., 1977. On the Regional Variation of Heat Flow, Geotherms and Lithospheric Thickness. Tectonophysics 38 (3–4), 279–296. https://doi.org/10.1016/0040-1951(77)90215-3.Sobolev N.V., Lavrent’ev Yu.G., Pokhilenko N.P., Usova L.V., 1973. Chrome-Rich Garnets from the Kimberlites of Yakutia and Their Parageneses. Contributions to Mineralogy and Petrology 40, 39–52. https://doi.org/10.1007/BF00371762.Sobolev N.V., Lavrent’ev Yu.G., Pokhilenko N.P., Usova L.V., 1973. Chrome-Rich Garnets from the Kimberlites of Yakutia and Their Parageneses. Contributions to Mineralogy and Petrology 40, 39–52. https://doi.org/10.1007/BF00371762.Ваганов В.И., Соколов С.В. Термобарометрия ультраосновных парагенезисов. М.: Недра, 1988. 149 с.Vaganov V.I., Sokolov S.V., 1988. Themobarometry of Ultrabasic Parageneses. Nedra, Moscow, 149 p. (in Russian)

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