Advanced Applied Geology

Advanced Applied Geology

ThermoBarometry setting of PlioQuaternary magmas of the Kaleybar, Varzaghan- Ahar- regions of Northwestern of Iran.

Authors
mahdieh Fazelihagh 1
Nasir Amel 2
Ahmad Jahangiri 1
Mohsen Moayyed 1
1 Department of Earth Sciences, Faculty of Natural Sciences, University of Tabriz, Tabriz, Iran
2 Department of Earth Sciences, Faculty of Natural Sciences. University of Tabriz, Tabriz, Iran.
10.22055/aag.2026.50636.2533
Abstract
The study areas are part of the Iran-Turkey Plateau and are located in the central part of the Arabian-Eurasian collision zone. The basaltic volcanic units studied are located in northwestern Iran and East Azerbaijan Province and are of Plio-Quaternary age according to stratigraphic evidence. These lavas have a composition of basalt, andesite-basalt, trachybasalt, basalt-trachyandesite and trachyandesite. Their main minerals include plagioclase, pyroxene, olivine, amphibole and minor minerals include apatite, quartz and opac minerals. In rock samples, the textures of the rocks are diverse and include microlithic porphyritic, hyaloporphyric, porphyritic and trachytic textures. Thermobarometric calculations have been performed for the minerals olivine, plagioclase, pyroxene and amphibole. Thermobarometric calculations show of pyroxene mineral in trachybasalt and trachyandesite-basaltic rocks in the study areas of Zandabad, Nahar, Gangalabad, Siah-Kalan, Marzroud and Kaleybar: temperature 1016-1226.07°C and pressure 3-13 kbar, for plagioclase mineral in trachybasalt and trachyandesite-basaltic rocks in the study areas of Zandabad, Nahar, Gangalabad, Siah-Kalan, Laleh-Bajan, Marzroud and Kalibar: temperature 1176-1249.90°C and pressure 10-15 kbar, for amphibole mineral in trachyandesite and trachyandesite-basaltic rocks in the study areas of Zandabad, Laleh-Bajan, Marzroud and Kalibar: temperature 954.87-733.37°C and pressure 10.06-13.5 kbar, and for olivine mineral in olivine-basaltic rocks in Nahar and Gangalabad areas, the temperature is 1261.97-1337°C. The results of barometric calculations of pyroxene and amphibole indicate crystallization at medium pressures, equivalent to the middle-lower crust, and barometric calculations of plagioclase indicate crystallization at greater depths, equivalent to the Earth's mantle.
Keywords
Pyroxene
plagioclase
amphibole
olivine
thermobarometry
Subjects
Akinin, V.V., Sobolev, A.V., Ntaflos, T., and Richter, W., 2005. Clinopyroxene megacrysts from Enmelen mela nephelinitic volcanoes (Chukchi Peninsula, Russia): application to composition and evolution of mantle melts. Contributions to Mineralogy and Petrology 150, 85–101. http://doi.org/10.1007/s00410-005-0007-x.
Allen, M.B., Armstrong, H.A., 2008. Arabia–Eurasia collision and the forcing of mid-Cenozoic global cooling. Palaeogeography, Palaeoclimatology, Palaeoecology 265, 52-58. https://doi.org/10.1016/j.palaeo. 2008. 04.021.
Ariskin, A.A., Barmina, G.S., 1990. Equilibria thermometry between plagioclases and basalt or andesite magmas. Geochem International 27, 129-134. https://doi.org/550.5.014/GI536.51.
Beattie, P., 1993. Olivine-melt and orthopyroxene-melt equilibria. Contribution to Mineralogy and Petrology 115, 103-111. https://doi. https://doi.org/10.1007/BF00712982.
Berberian, M., King, G.C.P., 1981. Towards a paleogeography and tectonic evolution of Iran. Canadian journal of Earth Science 18 (2), 210-265. https://doi.org/10.1139/e81-019.
Blatt, H., Tracy, R., 1995. Petrology: Igneous, Sedimentary and metamorphic. W.H., Freeman book Company New York.
Blundy, J., Cashman, K., Humphreys, M., 2006. Magma heating by decompression-driven crystallizationbeneath andesite volcanoes. Nature 443, 76-80. https://doi.org/10.1038/nature05100. 
Blundy, J.D., Holland, T.J.B., 1990. Calcic amphibole equilibria and a new amphibole-plagioclase geothermometer. Contribution to Mineralogy and Petrology 104 (2), 208–224. https://doi.org/ 10.1007/BF00306444.
Boulin, J., 1991. Structures in Southwest Asia and evolution of the eastern Tethys. Tectonophysics 196 (3-4), 211-268. https://doi.org/10.1016/0040-1951(91)90325-M.
Canil, D., 1999. The Ni-in-garnet geothermometer: calibration at natural abundances. Contribution to Mineralogy and Petrology 136, 240-246. https://doi.org/10.1007/s00050535.
Dabiri, R., Molayii, H., Yazdi, A., Ghfari, M., 2018. Chemical, thermobarometric, and phase equilibria investigation in Plio-Quaternary basic volcanic rocks of northeastern Varzeghan. Iranian Quaternary Journal 4, 911-934. https://doi.org/10.1515/geo-2020-0009.
Drake, M.J., 1976. Plagioclase-melt equilibria. Geochimica et Cosmochimica Acta 40 (4), 457-465. https:// doi.org/10.1016/0016-7037(76)90011-9.
Duchene, S., Albarede, F., 1999. Simulated garnet-clinopyroxene geothermometry of eclogites. Contributions to Mineralogy and Petrology 135 (1), 75-91. https://doi.org/10.1007/s004100050499.
Erdmann, S., Martel, C., Pichavant, M., Kushnir, A., 2014. Amphibole as an archivist of magmatic crystallization conditions: problems, potential, and implications for inferring magma storage prior to the paroxysmal 2010 eruption of Mount Merapi, Indonesia. Contribution to Mineralogy and Petrology 167, 1016. https://doi.org/10.1007/s00410-014-1016-4. 
Fu, B., Page, F.Z., Cavosie, A. J., Fournelle, J., Kita, N.T., Lackey, J.S., Wilde, S.A., Valley, J.W., 2008. Ti-in-zircon thermometry: applications and limitations. Contributions to Mineralogy and Petrology 156 (2), 197-215. https://doi.org/10.1007/s00410-008-0281-5.
Ghiorso, M.S., Hirschmann, M.M., Reiners, P.W., Kress, V.C., 2002. The pMELTS: a revision of MELTS for improved calculation of phase relations and major element partitioning related to partialmeltingofthemantleto3 GPa. Geochemistry, Geophysics, Geosystems 3, 1-36. https://doi.org/ 10.1029/2001GC000217.
Glazner, A.F., 1984. Activities of olivine and plagioclase components in silicate melts and their applicationto geothermometry. Contribution to Mineralogy and Petrology 88, 260-268. https://doi.org/ 10.1007/ BF00380170.
Hakli, T.A., Wright, T.L., 1967. The fractionation of nickel between olivine and augite as a geothermometer. Geochimca et Cosmochimica Acta 31, 877-884. https://doi.org/10.1016/S0016-7037(67)80036-X.
Herzberg, C., O’Hara, M.J., 2002. Plume-associated ultramafic magmas off Phanerozoic age. Journal of Petrology 43, 1857-1883. https://doi.org/10.1093/petrology/43.10.1857.
Holland, T., Blundy, J., 1994. Non-ideal interactions in calcic amphiboles and their bearing on amphiboleplagioclase thermometry. Contribution to Mineralogy and Petrology 116(4), 433–447. https://doi.org/10.1007/BF00310910.
Kohler, T.P., Brey, G.P., 1990. Calcium exchange between olivine and clinopyroxene calibrated as a geothermobarometer for natural peridotites from 2 to 60 kb with applications. Geochimica et Cosmochimica Acta 54 (9), 2375-2388. https://doi.org/10.1016/0016-7037(90)90226-B. 
Leeman, W.P., Lindstrom, D.J., 1978. Partitioning of Ni2+ between basaltic and synthetic melts andolivines–an experimental study. Geochimica et Cosmochimica Acta 42, 801-816. https://doi.org/10.1016/0016-7037(78)90094-7.
Lindsley, D.H., 1983. Pyroxene thermometry. American Mineralogist 68 (5-6), 477-493. https://doi.org/ 10. 1007/BF00372872.  
Loomis, T.P., 1979. An empirical model for plagioclase equilibrium in hydrous melts. Geochimica et Cosmochimica Acta 43, 1753-1759. https://doi.org/10.1016/0016-7037(79)90023-1.
Marsh, B.D., Fournelle, J., Myers, J.D., Chou, I-M., 1990. On plagioclase thermometry in island-arc rocks: experiments and theory. In: Fluid-Mineral interactions: A Tribute to H.P. Eugster. Spencer,RJ,Chou,I-M, (eds) Geochemical Society Special Publication 2, 65-83.
Mathez, E.A., 1973. Refinement of the Kudo-Weill plagioclase thermometer and its applications tobasalticrocks. Contribution to Mineralogy and Petrology 41, 61-72. https://doi.org/ 10.1007/ BF00377654.
McBirney, A.R., 2007. Igneous petrology. 3rd edition, Jones and Bartlett Learning. Burlington, Canada.
McQuarrie, N., Van Hinsbergen, D.J., 2013. Retrodeforming the Arabia-Eurasia collision zone: Age of collision versus magnitude of continental subduction. Geology 41, 315-318. https://do.org/10.1130/ G33591.1. 
Molina, J.F., Moreno, J.A., Castro, A., Rodríguez, C., Fershtater, G.B., 2015. Calcic amphibole thermobarometry in etamorphic and igneous rocks: new calibrations based on plagioclase/amphibole Al-Si partitioning and amphibole/liquid Mg partitioning. Lithos 232, 286–305. https://doi.org/10.1016/ j.lithos.2015.06.027.
Mollo, S., Putirka, K., Iezzi, G., Del Gaudio, P., Scarlato, P., 2011. Plagioclase–melt (dis)equilibrium due to cooling dynamics: Implications for thermometry, barometry and hygrometry. Lithos 125 (1–2), 221-235. https://doi.org/10.1016/j.lithos.2011.02.008.
Mollo, S., Putirka, K., Misiti, V., Soligo, M., Scarlato, P., 2013. A new test for equilibrium based on clinopyroxene–melt pairs: Clues on the solidification temperatures of Etnean alkaline melts at post-eruptive conditions. Chemical Geology 352, 92-100. https://doi.org/10.1016/j.chemgeo.2013.05.026.
Nagasaki, S., Ishibashi, H., Suwa, Y., Yasuda, A., Hokanishi, N., Ohkura, T., Takemura, K., 2017. Magma reservoir conditions beneath Tsurumi volcano, SW Japan: evidence from amphibole thermobarometry and seismicity. Lithos 278–281, 153–165. https://doi.org/10.1016/j.lithos.2017.01.011.
Neave, D.A., Putirka, K.D., 2017. A new clinopyroxene-liquid barometer, and implications for magma storage pressures under Icelandic rift zones. American Mineralogist 102 (4), 777-794. http://doi.org/10.2138/am-2017-5968.
Nimis, P., 1995. A clinopyroxene geobarometer for basaltic systems based on crystalstructure modeling. Contributions to Mineralogy and Petrology 121 (2), 115-125. https://doi.org/10/1007/s4100050093.
Nimis, P., Ulmer, P., 1998. Clinopyroxene geobarometry of magmatic rocks Part 1: An expanded structural geobarometer for anhydrous and hydrous, basic and ultrabasic systems. Contributions to Mineralogy and Petrology 133 (1-2), 122-135. https://doi.org/10.1007/s004100050442. 
Nimis, P., Taylor, W.R., 2000. Single clinopyroxene thermobarometry for garnet peridotites. Part I. Calibration and testing of a Cr-in-Cpx barometer and an enstatite-in-Cpx thermometer. Contributions to Mineralogy and Petrology 139 (5), 541-554. https://doi.org/10.1007/s004100000156.
Nowroozi, A.A., 1971. Seismo-tectonics of the Persian plateau, eastern Turkey, Caucasus, and Hindu-Kush regions. Seismological Society of America 61 (2), 317-341. https://doi.org/10.1785/BSSA0610020317.
Petry, C., Chakraborty, S., Palme, H., 1997. Olivine-melt nickel-iron exchange Thermometer: cosmochemical significance and preliminary experimental results. Meteoritics and Planetary Science 32, 106-107.
Putirka, K., Johnson, M., Kinzler, R., Longhi, J., Walker, D., 1996. Thermobarometry of mafic igneous rocks based on clinopyroxene-liquid equilibria, 0–30 kbar. Contributions to Mineralogy and Petrology 123 (1), 92-108. https://doi.org/10.1007/s004100050145.
Putirka, K., 1999. Clinopyroxene + liquid equilibria to 100 kbar and 2450 K. Contributions to Mineralogy and Petrology 135, 151-163. https://doi.org/10.1007/s004100050503.
Putirka, K., Ryerson, F.J., Mikaelian, H., 2003. New igneous thermobarometers for mafic and evolvedlava compositions, based on clinopyroxene + liquid equilibria. Am Mineral 88, 1542-1554. https://doi.org/ 10.2138/am-2003-1017.
Putirka, K., 2005b. Igneous thermometers and barometers based on plagioclase + liquid equilibriates some existing models and new calibrations. American Mineralogy 90, 336-346. https://doi.org/ 10.2138/ am.2005.1449. 
Putirka, K., Perfit, M., Ryerson, F.J., Jackson, M.G., 2007. Ambient and excess mantle temperatures, olivine thermometry, and active vs. passive upwelling. Chemical Geology 241, 177-206. https://doi.org/ 10.1016/ j.chemgeo.2007.01.014. 
Putirka, K., 2016. Amphibole thermometers and barometers for igneous systems and some implications for eruption mechanisms of felsic magmas at arc volcanoes. American Mineralogy 101, 851–858. https://doi.org/10.2138/am-2016-5506. 
Raymond, L.A, 2002. The study of igneous sedimentary and metamorphic rocks, McGraw-Hill Companies, Inc, NewYork.
Richards, J.P., 2015. Tectonic, magmatic, and metallogenic evolution of the Tethyan orogen: From subduction to collision. Ore Geology Reviews 70, 323–345. https://doi.org/10.1016/j.oregeorev.2014.11.009.
Ridolfi, F., Renzulli, A., Puerini, M., 2010. Stability and chemical equilibrium of amphibole in calc-alkaline magmas: an overview, new thermbarometric formulations and application to subduction-related volcanoes. Contribution to Mineralogy and Petrology 160, 45–66. https://doi.org/10.1007/s00410-009-0465-7.
Ridolfi, F., Renzulli, A., 2012. Calcic amphiboles in calc-alkaline and alkaline magmas: thermobarometric and chemometric empirical equations valid up to 1,130 °C and 22 GPa. Contribution to Mineralogy and Petrology 163, 877–895. https://doi.org/10.1007/s00410-011-0704-6.
Righter, K., Leeman, W.P., Hervig, R.L., 2006. Partitioning of Ni, Co, and V between spinel-structuredoxidesand silicate melts; importance of spinel composition. Chemical Geology 227, 1-25.
Roeder, P.L., Emslie, R.F., 1970. Olivine– liquid equilibrium, Contributions to Mineralogy and Petrology 29, 275 – 289. https://doi.org/10.1016/j.chemgeo.2005.05.011.
Sayari, M., and Sharifi, M., 2014. SCG: A computer application for single clinopyroxene geothermobarometry. Italian Journal of Geosciences 133 (2), 315-322. http://doi.org/10.3301/IJG.2014.0.
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, 304-310. https://doi.org/10.1007/BF00310745.
Soesoo, A., 1997. A multivariate statistical analysis of clinopyroxene composition: empirical coordinates for the crystallization PT-estimations. Geological Society of Sweden (Geologiska Föreningen) 119, 55-60. http://doi.org/10.1080/11035899709546454.
Stampfli, G.M., Borel, G.D., 2002. A plate tectonic model for the Paleozoic and Mesozoic constrained by dynamic plate boundaries and restored synthetic oceanic isochrons. Earth and Planetary Science Letters196, 17–33. https://doi.org/10.1016/S0012-821X(01)00588-X.
Stocklin, J., 1968. Structual history and tectonics of Iran. A review; American Association Petrology. Geology 7, 1229-1258. https://doi.org/10.1306/5D25C4A5-16C1-11D7-8645000102C1865D.
Sugawara, T., 2001. Ferric iron partitioning between plagioclase and silicate liquid: thermodynamicsand petrological applications. Contribution to Mineralogy and Petrology 141, 659-686. https://doi.org/10.1007/s00410-004-0568-0.
Verdel, C., Wernicke, B.P., Hassanzadeh, J., Guest, B., 2011. A Paleogene extensional arc flare up in Iran. Tectonics 30, TC3008. https://doi.org/10.1029/2010TC002809.
Vynhal, C.R., McSween, H.Y., Speer, J.A., 1991. Hornblende chemistry in southern Appalachian granitoids: implications for aluminum hornblende thermobarometry and magmatic epidote stability. American Mineralogist 76, 176-188. https://doi.org/17.700/46480406.
Wells, P.A., 1977. Pyroxene thermometry in simple and complex systems. Contributions to Mineralogy and Petrology 62 (2), 129-139. https://doi.org/10/1007/BF00372872.
Advanced Applied Geology
Volume 15, Issue 4
Autumn 2026
Pages 170-195