Depositional Environment and Diagenetic History of the Bisotoun Carbonate Succession (Lower Cretaceous), Kermanshah Area, West Iran

رخساره‌های رسوبی

Article 4, Volume 9, Issue 2, October 2016, Pages 87-108   

Document Type: مقالات پژوهشی

DOI: 10.22067/sed.facies.v9i2.42269

Authors

Mahnaz Azimi¹; Mohamad Hosein Mahmudy Gharaie^{* 1}; Asadallah Mahboobi¹; Kamal Taheri²

¹Ferdowsi University of Mashhad

²University of Kurdistan

Abstract

Introduction
The Zagros orogeny belt as a part of the Alpine Himalayas orogeny belt extended about 2000km in a northwest-southeast trend from the Anatolian fault in the southeast of Turkey to the Makran zone in southern Iran. Bisotun limestone was deposited on the southeastern border of the Neotetis Sea, where it was separated from the Arabic platform by the narrow and radiolarite basin of Kermanshah.
A 2500 m thick succession Bisotoun carbonate rocks of the Late Triassic to Late Cretaceous in age were exposed at the east of Kermanshah as a part of the High Zagros zone. The studied section consists of dark gray color, medium to thick bed and massive limestone. Little studies have been done on the microfacies analysis, sedimentary environments and diagenesis history of the Bisotoun limestones.
Since these limestones are deposited along with the radiolarite deposits, sedimentary studies and facies analysis help to reconstruct the paleogeography, their relation with the Kermanshah radiolarite basin, as well as investigate the diagenic history of the Bisotoun carbonate successions.

Study method
105 thin sections were prepared for petrography. To recognize the calcite from dolomite under microscope, all thin sections were stained with Alizarin red solution (by Dickson 1965 method). The Cathodoluminescence (CL) microscopy and scanning electron microscope (SEM) have been conducted to study the dolomites and cements. Classification of dolomites was based on Sibley & Gregg (1987). The blue epoxy has been used to estimate the porosity in studied samples.

Results and discussion
Petrographic study of 105 thin sections from this succession led to identification of 8 carbonate facies that are deposited in four depositional environments including open marine, shoal, lagoon and tidal flat. Due to the absence of turbidity facies, cortoid, ankoid, pizoid and aggregate allochem, which indicate carbonate shelf and rarely found in a carbonate ramp, and also because of gradual changes in vertical sequence, the depositional environment of Bisitoun carbonate succession is a homoclinal ramp (consisting of middle and inner ramp). Facies are classified according to Dunham (1962) and Embry & Klovan (1971) classifications. The facies analysis is based on Schlager (2002) and Flugel (2010).
The main diagenetic processes that affected the studied succession are micritization, bioturbation, replacement (dolomitization, silicification, pyritization and dedolomitization), compaction, stylolitization, cementation (blocky, syntaxial overgrowth, poikilotopic, isopachous and drusy equant), fracturing and vein filling, neomorphism, dissolution and hematitizationt. These processes were conducted in marine, burial (shallow and deep burial) and uplifted (meteoric) stages of diagenetic environments.
The marine diagenetic process include micritization (that destroyed the internal components of the allochems), syntaxial overgrowth calcite cement, bioturbation (that is mainly found in rudist containing facies). The burial (shallow and deep burial) diagenetic process include physical (compaction in mud-supported facies) and chemical (stylolitization) phenomena. These process affected on most carbonate facies and played important role in the studied succession. Most of the allochems are cut off by stylolitization in which the presence of dolomite and iron oxide is common. Channel porosity and stylolitization porosity are significant in studied carbonate rocks, which some of them are filled by spary calcite cement. Dolomite dissolution, dedolomitization, channel and moldic porosity were created in uplift and meteoric diagenetic environments

Conclusion
Based on field observation and petrography studies it is concluded that the Bisotoun carbonate rocks have been deposited in middle and inner parts of a homoclinal ramp. The most important diagenetic processes observed in Bisotoun carbonate rocks are micritization, bioturbation, replacement, compaction, stylolitization, cementation, fracturing and vein filling, neomorphism, dissolution and hematitizationt, which are mainly occurred in marine, burial and uplift stages of diagenetic environments. Channel porosity and stylolitization porosity are significant in studied carbonate rocks.

Key words: Bisotoun limestone; Late Cretaceous; Facies; Depositional Environment; Diagenesis.

References
Dunham, R.J., 1962. Classification of carbonate rocks according to depositional texture. In: Ham, W.E. (ed(., Classification of carbonate rocks. American Association of Petroleum Geology Memori, 1: 108-121.
Embry, A.F., & Klovan, J.E., 1971. A late Devonian reef tract on northeastern banks island, Northwest Territories. Bulletin of Canadian Petroleum Geology, 19: 730-781.
Flügel, E., 2010. Microfacies of Carbonate Rocks, Analysis Interpretation and Application. Berlin- Heidelberg, New York, Springer, 976 p.
Schlager, M., 2002. Sedimentology and Sequence Stratigraphy of Carbonate Rocks, Amsterdam, Society for Sedimentary Geology, 146 p.
Sibley, D.F., & Gregg, J.M., 1987. Classification of dolomite rock textures. Journal of Sedimentary Petrology, 57: 967-975.

Keywords

Bisotoun limestone; Late Cretaceous; facies; Depositional environment; diagenesis

References

الیاس زاده، ر.، محجل، م.، بیرالوند، م.، 1389. ساختار پهنه برخوردی کوهزاد زاگرس در شمال باختر ایران. فصانامه زمین شناسی ایران، 16: 25-36.

کریمی باوندپور، ع.، 1378. نقشه زمین شناسی ورقه 1:100000 کرمانشاه. سازمان زمین شناسی و اکتشافات معدنی کشور.

مطیعی، ه.، 1372. زمین شناسی ایران: چینه شناسی زاگرس، ویرایش اول، سازمان زمین شناسی و اکتشافات معدنی کشور، تهران، 572 ص.

Abdi, A., Mahmudi Gharaie, M.H., & Badenas, B., 2014. Internal wave deposits in Jurassic Kermanshah pelagic carbonates and radiolarites (Kermanshah area, West Iran). Sedimentary Geology, 314: 47-59.

Agard, P., Omrani, J., Jolivet, L., & Mouthereau, F., 2005. Convergence history across Zagros (Iran): constraints from collisional and earlier deformation. International Journal of Earth Sciences, 94: 401-419.

Agard, P., Omrani, J., Jolivet, L., Witechurch, H., Vrielynck, B., Spakman, W., Monie, P., Meyer, B., & Wortel, R., 2011. Zagros orogeny: a subduction-dominated process. Geological Magazine, 148 (5-6): 692-725.

Aghaei, A., Mahboubi, A., Moussavi- Harami, R., Najafi, M., & Hakrapani, G.J., 2014. Carbonate Diagenesis of the Upper Jurassic Successions in the West of Binalud- Eastern Alborz (NE Iran). Journal of the Geological Society of India, 83: 311-328.

AL- Aasm, I.S., Ghazban, F., & Ranjbaran, M., 2009. Dolomitization and Related Fluid Evolution in the Oligocene– Miocene Asmari Formation, Gachsaran area, SW Iran: Petrographic and Isotopic Evidence. Journal of Petroleum Geology, 32 (3): 287-304.

Al- Qayim, B., Omer, A., & Koyi, H., 2012. Tectonostratigraphic overview of the Zagros Suture Zone, Kurdistan Region, Northeast Iraq, Geo Arabia. Journal of the Middle East Petroleum Geosciences, 17 (4): 109-156.

Alavi, M., 2007. Structures of the Zagros fold- thrust belt in Iran. American Journal of Sciences, 307: 1064-1095.

Beavington- Penney, S.J., Nadin, Ph., Wright, V.P., Clarke, E., McQuilken, J., & Bailey, H.W., 2005. Reservoir quality variation on an Eocene carbonate ramp, El Garia Formation, offshore Tunisia: Structural control of burial corrosion and dolomitisation. Sedimentary Geology, 209: 42-57.

Braud, J., 1970. Explanatory text of the Bakhtaran (Kermanshah) quadrangle map, Quadrangle C6. Geological Survey of Iran, Tehran.

Bustillo, M.A., 2010. Silicification of continental carbonates. In: Alonso-Zarza A., & Tanner L.H., (eds.), Carbonates in continental settings: processes, facies and applications. Elsevier, Developments in Sedimentology, 62: 153-174.

Dickson, J.A.D., 1965. A modified staining technique for carbonate in thin section. Nature, v. 205: 587 p.

Dunham, R.J., 1962. Classification of carbonate rocks according to depositional texture. In: Ham, W.E. (ed(., Classification of carbonate rocks. American Association of Petroleum Geology Memori, 1: 108-121.

Embry, A.F., & Klovan, J.E., 1971. A late Devonian reef tract on northeastern banks island, Northwest Territories. Bulletin of Canadian Petroleum Geology, 19: 730-781.

Flügel, E., 2010. Microfacies of Carbonate Rocks, Analysis Interpretation and Application. Berlin- Heidelberg, New York, Springer, 976 p.

Fu, Q., Qing, H., Bergman, K.M., & Yang, C., 2008. Dedolomitization and calcite cementation in the Middle Devonian Winnipegosis Formation in Central Saskatchewan, Canada. Sedimentology, 55: 1623-1642.

Ghabeishavi, A., Vaziri-Moghaddam, H., Taheri, A., & Taati, F., 2010. Microfacies and depositional environment of the Cenomanian of the Bangestan anticline, SW Iran. Journal of Asian Earth Sciences, 16: 212-223.

Heydari, E., 2008. Tectonics versus eustatic control on supersequences of the Zagros Mountains of Iran. Tectonophysics, 451: 56-71.

JiTao, Ch., ZuoZhen, H., XiaoLei, Zh., AiPing, F., & RenChao, Y., 2010. Early diagenetic deformation structures of the Furongian ribbon rocks in Shandong Province of China-A new perspective of the genesis of limestone conglomerates. Science China Earth Sciences, 53: 241-252.

Laronne Ben- Itzhak, L., Aharonov, E., Karcz, Z., Kaduri, M., & Toussaint, R., 2014. Sedimentary stylolite networks and connectivity in limestone: Large-scale field observations and implications for structureEvolution. Journal of Structural Geology, 63: 106-123.

Loucaides, S., Koning, E., & Van Cappellen, P., 2012. Effect of pressure on silica solubility of diatom frustules in the oceans: Results from long- term laboratory and field incubations. Marine Chemistry, 136: 1-6.

Madden, R.H.C., & Wilson, M.E.J., 2013. Diagenesis of a SE Asian Cenozoic carbonate platform margin and its adjacent basinal deposits. Journal of Sedimentary Research, 286: 20-38.

Manual, A.F., 2002, Analysis of Sedimentary Successions. Ajit Bhattacharyya Chandan Chakraborty, 408 p.

Mehrabi, H., Rahimpour-Bonab, H., Enayati- Bidgoli, A.H., & Navidtalab, A., 2014. Depositional environment and sequence stratigraphy of the Upper Cretaceous Ilam Formation in central and southern parts of the Dezful Embayment, SW Iran. Carbonates and Evaporites, 29 (3): 263-278

Mohajjel, M., Fergusson, C.L., & Sahandi, M.R., 2003. Cretaceous–Tertiary convergence and continental collision, Sanandaj–Sirjan Zone, Western Iran. Journal of Asian Earth Sciences, 21: 379–412.

Navabpour, P., Barrier, E., & McQuillan, H., 2014. Oblique oceanic opening and passive margin irregularity, as inherited in the Zagros fold-and-thrust belt. Terra Nova, 26 (3): 208-215.

Omer, M.F., Omer, D., Zebari, B.Gh., 2014. High resolution cathodoluminescence spectroscopy of carbonate cementation in Khurmala Formation (Paleocene- Late Eocene) from Iraqi Kurdistan Region, Northern Iraq. Journal of African Earth Sciences, 100: 243-258.

Romero, J., Caus, E., & Rosell, J., 2002. A model for the palaeoenvironmental distribution of larger foraminifera based on late Middle Eocene deposits on the margin of the South Pyrenean basin (NE Spain), Palaeogeography, Palaeoclimatology, Palaeoecology, 179 (1-2): 43-56.

Sahraeyan, M., Bahrami, M., Hooshmand, M., Ghazi, Sh., & 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

Schlager, M., 2002. Sedimentology and Sequence Stratigraphy of Carbonate Rocks, Amsterdam, Society for Sedimentary Geology, 146 p.

Scholle, P.A., & Scholle, D.S., 2003. A Color Guide to the Petrography of Carbonate Rocks: Grains, textures, porosity, diagenesis, American Association of Petroleum Geologists, Tulsa, Oklahoma, Memoir 27, 459 p.

Shafaii- Moghadam, H., & Stern, R.J., 2011. Geodynamic Evolution of Upper Cretaceous Zagros Ophiolites: Formation of Oceanic Lithosphere above a Nascent Subduction Zone. Geological Magazine, 148 (5–6): 762–801.

Sibley, D.F., & Gregg, J.M., 1987. Classification of dolomite rock textures. Journal of Sedimentary Petrology, 57: 967-975.

Smrzka, D., 2013. Petrography and Geochemistry of Eocene Cold– Seep Carbonates from Washington State, USA, Master of Science thesis, Universitate Wien, 111p.

Steuber, T., 1999. Isotopic and chemical intra-shell variations in low-Mg calcite of rudist bivalves (Mollusca-Hippuritacea): disequilibrium fractionations and late Cretaceous seasonality. International Journal of Earth Sciences, 88(3): 551-557.

Steuber, T., Rauch, M., Masse, J.P, Graaf, J., & Malkoč, M., 2005. Low-latitude seasonality of Cretaceous temperatures in warm and cold episodes. Nature Cell Biology, 437(27): 1341-1344.

Tucker, M.E., 2001. Sedimentary Petrology: An Introduction to the Origin of Sedimentary Rocks. Blackwell Scientific Publication, Third edition, Oxford, 262 p.

Tucker, M., & Wright, V.P., 1990. Carbonate Sedimentology. Blackwell Scientific Press, 482 p.

Vandeginste, V., & John, C.M., 2012. Influence of Climate and Dolomite Composition on Dedolomitization: Insights from a Multi- Proxy Study in the Central Oman Mountains. Journal of Sedimentary Research, 82: 177–195.

Vandeginste, V., & John, C.M., 2013. Diagenetic Implications of Stylolitization in Pelagic Carbonates, Canterbury Basin, Offshore New Zealand. Journal of Sedimentary Research, 83: 226-240.

Wrobel Daveau, J.C., Ringenbach, J.C., Tavakoli, S., Ruiz, G.M.H., Masse, P., & deLamotte, D.F., 2010. Evidence for mantle exhumation along the Arabian margin in the Zagros (Kermanshah area, Iran). Arabian Journal of Geosciences, 3: 499–513.

Zhou, X., Zeng, Z., 2014. The development of Stylolite s in Carbonate formation: Implication for Co2 sequestration. Acta Geologica Sinica, 88 (1): 238-247.