Document Type : Original Research Paper


Assistant Professor, Geology Department, Payame Noor University, I. R. Iran


The Mesozoic sequence in the Zagros Region (SW Iran) consists dominantly of carbonates especially dolomite that play the role of reservoir in many oil and gas fields of the region. To investigate the function of sedimentary and diagenetic processes in the formation of Triassic-Neocomian dolomites of the easthern High Zagros, this study focuses on petrography and geochemistry of the carbonates crop out in the Khaneh Kat anticline. Field and laboratory data led to the recognition of four different dolomitization models within the studied carbonates. The Lower-Middle Triassic and Upper Jurassic dolomites are medium to thick-bedded and composed of fine to medium-grained relatively ordered dolomite. The stoichiometric chemistries and heavier oxygen isotope ratios of these dolomites as well as the considerable presence of evaporites indicate the favorable conditions for the formation of early dolomite due to downward-percolating of concentrated evaporate brines (reflux model). The Upper Triassic dolomitic portion of the Zagros consists of medium to coarse-crystalline, massive-bedded dolomites with relatively light isotopic composition. Mineralogy and geochemistry of these dolomites indicate a high temperature origin as well as their relationship to diagenetic processes, including recrystallization in a deep-subsurface environment (burial model). In the Upper Jurassic portion of the succession, dolomites are ...


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Adabi, M. H., Salehi, M. A. and Ghabeishavi, A., 2010- Depositional environment, sequence stratigraphy and geochemistry of Lower Cretaceous carbonates (Fahliyan Formation), south-west Iran. Journal of Asian Earth Sciences, 39: 148–160.
Adam, J. and Al-Aasm, I. S., 2017- Petrologic and geochemical attributes of calcite cementation, dolomitization and dolomite recrystallization: an example from the Mississippian Pekisko Formation, west-central Alberta. Bulletin of Canadian Petroleum Geology, 65(2): 235–261. DOI: 10.2113/gscpgbull.65.2.235.
Alavi, M., 2004- Regional stratigraphy of the Zagros fold-thrust belt of Iran and its proforeland evolution. American Journal of Science, 304: 1–20. DOI: 10.2475/ajs.304.1.1.
Alavi, M., 2007- Structures of the Zagros fold-thrust belt in Iran. American Journal of Science, 307: 1064-1095. DOI: 10.2475/09.2007.02.
Allan, J. R. and Wiggins, W. D., 1993- Dolomite Reservoirs: Geochemical Techniques for Evaluating Origin and Distribution. American Association of Petroleum Geologists, Continuing Education Course Notes No. 36, 129 p.
Allen, M. B. and Talebian, M., 2011- Structural variation along the Zagros and the nature of the Dezful Embayment. Geological Magazine, 148: 911–924. DOI: 10.1017/s0016756811000318.
Alsharhan, A. S. and Nairn, A. E. M., 2003- Sedimentary Basins and Petroleum Geology of the Middle East. Elsevier,
878 p.
Alsharhan. A. S. and Whittle, G. L., 1995- Carbonate-Evporite Sequences of the Late Jurassic, Southern and Sothwestern Persian Gulf. American Association of Petroleum Geologists Bulletin, 79: 1608-1630.
Berberian, M., 1995- Master "blind" thrust faults hidden under the Zagros folds: active basement tectonics and surface morphotectonics. Tectonophysics, 241: 193-224.
Berberian, M. and King, C. G. P., 1981- Towards a paleogeography and tectonic evolution of Iran. Canadian Journal of Earth Sciences, 18: 210-265.
Blendinger, W., Lohmeier, S., Bertini, A., Meibner, E. and Sattler, C. D., 2015- A new model for the formation of dolomite in the Triassic dolomites, northern Italy. Journal of Petroleum Geology, 38(1): 5-36.
Boggs, S., 2009- Petrology of Sedimentary Rocks. Cambridge University Press, 600 p.
Braithwite, C. J. R., Rizzi, G. and Darke, G., 2004- The Geometry and Petrogenesis of Dolomite Hydrocarbon Reservoirs. Geological Society of London, Special Publication No. 235, 413 p.
Chen, D., Qing, H. and Chao, Y., 2004- Multistage hydrothermal dolomites in the Middle Devonian (Givetian) carbonates from the Guilin area, South China. Sedimentology, 51: 1029–1051. DOI: 10.1111/j.1365-3091.2004.00659.x.
Dickson, J. A. D., 1965- Carbonate identification and genesis as revealed by staining. Journal of Sedimentary Petrology, 36: 491-505.
Fakhari, M. D., Axen, G. J., Horton, B. K., Hassanzadeh, J. and Amini, A., 2008- Revised age of proximal deposits in the Zagros foreland basin and implications for Cenozoic evolution of the High Zagros. Tectonophysics, 451(1-4): 170-185. DOI: 10.1016/j.tecto.2007.11.064.
Flugel, E., 2010- Microfacies of carbonate rocks. Springer, 984 p.
Folk, R. L., 1980- Petrology of Sedimentary Rocks. Hemphill Publishing Company, 182 p.
Frakes, L. A. and Francis, J. E., 2005- Climate Modes of the Phanerozoic. Cambridge University Press, 274 p.
Ghazban, F., 2007- Petroleum geology of the Persian Gulf. Tehran University Press, 707 p.
Golonka, J., 2004- Plate tectonic evolution of the Southern Margin of Eurasia in the Mesozoic and Cenozoic. Tectonophysics, 381(1-4): 235-273. DOI: 10.1016/j.tecto.2002.06.004.
Golonka, J. and Kiessling, W., 2002- Phanerozoic Time Scale and definition of time slices. Society for Sedimentary Geology, Special Publication No. 72, p. 11-20. DOI: 10.2110/pec.02.72.0011.
Green, D. G., 2005- Fault and conduit controlled burial dolomitization of the Devonian west-central Alberta Deep Basin. Bulletin of Canadian Petroleum Geologists, 53: 101–129. DOI: 10.2113/53.2.101.
Haas, J., Lobitzer, H. and Monostori, M., 2007- Characteristics of the Lofer cyclicity in the type locality of the Dachstein Limestone (Dachstein Plateau, Austria). Facies, 53: 113–126. DOI: 10.1007/s10347-006-0087-8
Haas, J., Lukoczki, G., Budai, T. and Demeny, A., 2015- Genesis of Upper Triassic peritidal dolomites in the Transdanubian Range, Hungary. Facies, 61(8): 1-28. DOI: 10.1007/s10347-015-0435-7.
Haq, B. U. and Al-Qahtani, A. M., 2005- Phanerozoic cycles of sea-level change on the Arabian Platform. GeoArabia, 10(2): 127-160.
Heydari, E., 2008- Tectonics versus eustatic control on supersequences of the Zagros Mountains of Iran. Tectonophysics, 451: 56–70. DOI: 10.1016/j.tecto.2007.11.046.
Iannace, A., Capuano, M. and Galluccio, L., 2011- Dolomites and dolomites in Mesozoic platform carbonates of the Southern Apennines: Geometric distribution, petrography and geochemistry. Palaeogeography, Palaeoclimatology, Palaeoecology, 310: 324–339. DOI: 10.1016/j.palaeo.2011.07.025.
Iannace, A. and Frisia, S., 1994- Changing dolomitization styles from Norian to Rhaetian in southern Tethys realm. In: Purser, B., Tucker, M. and and Zenger, D., (Eds) Dolomites: A Volume in Honour of Dolomieu. Blackwell Scientific Publications No. 21, p. 75–89.
James, G. A. and Wynd, J. G., 1965- Stratigraphic nomenclature of Iranian oil consortium agreement area. American Association of Petroleum Geologists Bulletin, 49(12): 2182-2245. DOI: 10.1306/a663388a-16c0-11d7-8645000102c1865d.
Kaczmarek, S. E. and Sibley, D. F., 2014- Direct physical evidence of dolomite recrystallization. Sedimentology, 61: 1862–1882. DOI: 10.1111/sed.12119.
Kashfi, M. S., 2000- The greater Persian Gulf Permian-Triassic stratigraphic nomenclature requires study. Oil and Gas Journal, Tulsa, 6: 36-44. DOI: 10.1306/bf9ab714-0eb6-11d7-8643000102c1865d.
Koop, W. J. and Stoneley, R., 1982- Subsidence history of the Middle East Zagros Basin, Permian to Recent, Philos. Trans. R. Soc. London, Ser. A, 305: 149–168. DOI:10.1098/rsta.1982.0031.
Korte, Ch., Kozur, H. W. and Veizer, J., 2005- δ13C and δ18O values of Triassic brachiopods and carbonate rocks as proxies for coeval seawater and palaeotemperature. Palaeogeogry Palaeoclimatoly Palaeoecology, 226: 287–306. DOI: 10.1016/j.palaeo.2005.05.018.
Lasemi, Y. and Jalilian, A. H., 2010- The Middle Jurassic basinal deposits of the Surmeh Formation in the Central Zagros Mountains, southwest Iran: Facies, Stacking pattern and Controls. Carbonates and Evaporites, 25: 283-295. DOI: 10.1007/s13146-010-0032-3.
Lasemi, Y., Jahani, D., Amin-Rasouli, H. and Lasemi, Z., 2012- Ancient Carbonate Tidalites. In: Davis, J. R. A. and Dalrymple, R. W., (Eds). Principles of Tidal Sedimentology. Spriger, pp. 567-607. DOI: 10.1007/978-94-007-0123-6_21.
Leturmy, P. and Robin, C., (Eds) 2010- Tectonic and Stratigraphic Evolution of Zagros and Makran during the Mesozoic–Cenozoic. Geological Society of London, Special Publications No. 330, 360 p. DOI: 10.1017/S0016756811000264.
Machel, H. G., 2004- Concepts and models of dolomitization: a critical reappraisal. In: Braithwite, C. J. R., Rizzi, G. and Darke, G., (Eds) The Geometry and Petrogenesis of Dolomite Hydrocarbon Reservoirs. Geological Society of London, Special Publication No. 235, p. 7-64. DOI: 10.1144/GSL.SP.2004.235.01.02.
Meister, P., McKenzie, J. A., Bernasconi, S. M. and Brack, P., 2013- Dolomite formation in the shallow seas of the Alpine Triassic. Sedimentology, 60: 270–291. DOI: 10.1111/sed.12001.
Morettini, E., Baumgartner, P.O., Hunziker, J.C., Monaco, P. and Ripepem, M., 2000- Stable Isotopic signal of carbon and oxygen in Jurassic Marlstone–Limestones rhythms (Italy, Central Apennines). GeoResearch Forum 6: 487–498.
Mouthereau, F., Lacombe, O. and Verges, J., 2012- Building the Zagros collisional orogen: timing, strain distribution, and the dynamics of Arabia/Eurasia plate convergence. Tectonophysics, 532-535: 27-60. DOI: 10.1016/i.tecto.2012.01.022.
Murris, R. J., 1980- Middle East: Stratigraphic evolution and oil habitat. American Association of Petroleum Geologists Bulletin, 64(5): 597-618. DOI: 10.1306/2f918a8b-16ce-11d7-8645000102c1865d.
Najafi, M., Yassaghi, A., Bahroudi, A., Vergés, J. and Sherkati, Sh., 2014- Impact of the Late Triassic Dashtak intermediate detachment horizon on anticline geometry in the Central Frontal Fars, SE Zagros fold belt, Iran. Marine and Petroleum Geology, 54: 23-36.
Pirouz, M., Simpson, G., Bahroudi, A. and Azhdari, A., 2011- Neogene sediments and modern depositional environments of the Zagros foreland basin system: Geological Magazine, Cambridge University Press, 148(5-6): 838-853. DOI: 10.1017/s0016756811000392.
Piryaei, A., Reijmer, J. J. G., Borgomano, J. and van Buchem, F. S. P., 2010- Late Cretaceous tectonic and sedimentary evolution of the Bandar Abbas area, Fars region, Southern Iran. Journal of Petroleum Geology, 34(2): 157-180.
Pokrovsky, O. S., 2017- Dolomite: Formation, Characteristics and Environmental Impact. Nova Science Publication Inc, 190 p.
Purser, B., Tucker, M. and Zenger, D., 1994- Dolomites: A Volume in Honour of Dolomieu. Blackwell Scientific Publications No. 21, 451 p.
Rahimpour-Bonab, H., Esrafili-Dizaji, B. and Tavakoli, V., 2010- Dolomitization and Anhydrite Precipitation in Permo‐Triassic Carbonates at the South Pars Gasfield, Offshore Iran: Controls on Reservoir Quality. Journal of Petroleum Geology, 33(2): 1-24.
Ren, M. and Jones, B., 2017- Spatial variations in the stoichiometry and geochemistry of Miocene dolomite from Grand Cayman: Implications for the origin of island dolostone. Sedimentary Geology, 348: 69–93. DOI: 10.1016/j.sedgeo.2016.12.001.
Ronchi, P., Jadoul, F., Ceriani, A., Di Giulio, A., Scotti, P., Ortenzi, A. and Massara, P.E., 2010- Multistage dolomitization and distribution of dolomitized bodies in Early Jurassic carbonate platforms (Southern Alps, Italy). Sedimentology, 58(2): 532-565.
Sahraeyan, M., Bahrami, M., Hooshmand, M., Ghazi, Sh. and Al-Juboury, A. I., 2013- Sedimentary facies and diagenetic features of the Early Cretaceous Fahliyan Formation in the Zagros Fold-Thrust Belt, Iran. Journal of African Earth Sciences, 87: 59–70. DOI: 10.1016/j.jafrearsci.2013.07.004.
Scholle, P. A. and Ulmer-Scholle, D. S., 2003- A Color Guide to the Petrography of Carbonate Rocks: Grains, textures, porosity, diagenesis. American Association of Petroleum Geologists Memoir 77, 459 p.
Searl, A., 1989- Saddle dolomite: a new view of its nature and origin. Mineralogical Magazine, 53: 547-555. DOI: 10.1180/minmag.1989.053.373.05.
Sepehr, M. and Cosgrove, J. W., 2004- Structural framework of the Zagros Fold-Thrust Belt, Iran. Marine and Petroleum Geology, 21: 829–843. DOI: 10.1016/j.marpetgeo.2003.07.006.
Setudehnia, A., 1978- The Mesozoic sequence in southwest Iran and adjacent area. Journal of Petroleum Geology, 1(1): 3-42.
Seyed-Emami, K., 2003- Triassic in Iran. Fcies, 48: 91-106. DOI: 10.1007/BF02667532.
Sharland, P. R., Archer, R., Casey, D. M., Davies, R. B., Hall, S. H., Heward, H. P., Horbory, A. D. and Simons, M. D., 2001- Arabian plate sequence stratigraphy. GeoArabia, Gulf Petrolink, Bahrain, 370 p.
Sherkati, S., Letouzey, J. and Frizon de Lamotte, D., 2006- Central Zagros fold-thrust belt (Iran): New insights from seismic data, field observation, and sandbox modeling. Tectonics, 25, 1-27.
Sibley, D. F. and Gregg, J. M., 1987- Classificatin of dolomite rock texture. Journal of Sedimentary Petrology, 57: 967-975. DOI: 10.1016/0148-9062(88)92447-3.
Spötl, C. and Pitman, J. K., 2009- Saddle (Baroque) Dolomite in Carbonates and Sandstones: A Reappraisal of a Burial-Diagenetic Concept. In: Morad, S., (Ed) Carbonate Cementation in Sandstones: Distribution Patterns and Geochemical Evolution. International Association of Sedimentologists, Special Publication No. 26, p. 437-460. DOI: 10.1002/9781444304893.CH19.
Swart, P. K., Cantrell, D. L., Westphal, H., Handford, C. R. and Kendall, C. G., 2005- Origin of dolomite in the Arab-D reservoir from the Ghawar Field, Saudi Arabia: evidence from petrographic and geochemical constraints. Journal of Sedimentary Research, 75:476–491. DOI: 10.2110/jsr.2005.037.
Szabo, F. and  Kheradpir, A., 1978- Permian and Triassic stratigraphy, Zagros basin, south-west Iran. Journal of Petroleum Geology, 1(2): 57-82.
Van Buchem, F. S. P., Gerdes, K. D. and Esteban, M., 2010- Mesozoic and Cenozoic Carbonate Systems of the Mediterranean and the Middle East: Stratigraphic and Diagenetic Reference Models. Geological Society, London, Special Publications No. 329, 422 p.
Warren, J. K., 2000- Dolomite: occurrence, evolution and economically important associations. Earth-Science Reviews, 52: 1–81. DOI: 10.1016/s0012-8252(00)00022-2.
Warren, J. K., 2006- Evaporites: Sediments, Resources and Hydrocarbons. Springer, 1035 p.
Wierzbicki, R., Dravis, J. J., Al-Aasm, I. and Harland, N., 2006- Burial dolomitization and dissolution of Upper Jurassic Abenaki platform carbonates, Deep Panuke reservoir, Nova Scotia, Canada. American Association of Petroleum Geologists, 90(11): 1843–1861. DOI: 10.1306/03200605074.
Winkelstern, I. Z. and Lohmann, K. C., 2017- Shallow burial alteration of dolomite and limestone clumped isotope Geochemistry. Geology, 44(6): 467–470. DOI: 10.1130/g37809.1.
Wright, D. T. and Wacey, D., 2004- Sedimentary dolomite: a reality check. In: Braithwite, C. J. R., Rizzi, G. and Darke, G., (Eds) The Geometry and Petrogenesis of Dolomite Hydrocarbon Reservoirs. Geological Society of London, Special Publication No. 235, p. 65-74. DOI: 10.1144/GSL.SP.2004.235.01.03.
Ziegler, M. A., 2001- Late Permian to Holocene paleofacies evolution of the Arabian Plate and its hydrocarbon occurrences. GeoArabia, 6: 445–504.