Microfacies, depositional environment and diagenetic processes of the Qom Formation in the Khani Abad section, southeast of Kashan

Document Type : مقالات پژوهشی

Authors

• Elham Asadi Mehmandosti
• Jahanbakhsh Daneshian
• Nematollah Margir

Kharazmi University

10.22067/sed.facies.v12i1.70042

Abstract

Introduction
During the Late Oligocene -Early Miocene time, the western border of central Iran (Qom, Hamedan, Kashan and Tafresh) to the southern margin of Jazmurian and some regions of Azerbaijan as well as in the Zagros a carbonate platform formed with evidence as a vast marine progradation that was a part of the horst of Pyrenean tectonic phase. The carbonate succession is named Asmari Formation in Zagross and Qom Formation in Azerbaijan and Central Iran (Aghanabati, 2006). Due to the economic importance of the Qom Formation as a hydrocarbon reservoir and the presence of celestite and chalk deposits, this formation is important to study. Although lots of stratigraphic and lithologic studies are done on the Qom Formation, due to variations in depositional environment of the Qom Formation in different locations, it is not possible to consider one type of sedimentary environment for this formation (e.g. Seyrafian et al., 2007; Mohammadi et al., 2009; Reuter et al., 2009; Safari et al., 2014; Daneshian et al., 2017; Nasiri Ghareh Shiran, 2017). In this research, the Qom Formation was studied in Khani Abad stratigraphic section in the southeast Kashan. The aim was to investigate microfacies, sedimentary environment and diagenetic features of Qom Formation in this area.
 
Methods and Material
During the field study, sampling was performed systematically. 98 samples were collected from the Qom Formation in Khani Abad section with a thickness of 70 meters. It contains 36 soft and 62 hard samples. The sampling distance in carbonate parts was several centimeters in some areas, based on facies variations. Thin sections were prepared from hard samples. All thin sections were stained with potassium ferricyanide and alizarin-red S solution (Dickson, 1965). The petrographic classification for carbonates is based on the Dunham (1962) and Embry and Klovan (1971) classification schemes. In this study, Dolomite textural classified based on Sibley and Gregg (1987) and Mazzullo (1992) and for the size of dolomite crystals from the scale provided by Folk (1974). Wilson (1975), Pomar (2001) and Flügel (2010) facies belts and sedimentary models were also used.
 
Discussion
The Qom Formation in Khani Abad stratigraphic section, southeast of Kashan has 70 m thickness and is composed of thick, medium and thin-bedded limestone, argillaceous limestone, dolomitic limestone and marl. This formation with erosional boundaries located between the red color non-marine rocks (the Lower and Upper Red formations). Investigations of 98 selected samples in this outcrop led to the recognition of 9 microfacies in 2 lagoonal and shoal facies belts and a marl petrofacies. The lagoonal facies are A1: Benthic Foraminifera, Bioclast Grainstone, A2: Bioclast Wackestone, A3: Benthic Foraminifera Packstone to Wackestone, A4: Bryozoan Bioclast Packstone, A5: Bivalve Packstone. A6: Bryozoa, Bivalve, Bioclast Packstone and A7: Benthic Foraminifera Red Algae Packstone to Wackestone. The shoal facies are B1: Coral Boundstone and B2: Bioclast Red Algae Grainstone. Micritization, bioturbation, cementation, dissolution, neomorphism, replacement and dolomitization are the main diagenetic features in the studied area.
 
Conclusion
According to field observations (discontinuous reef traces), the abundance of packstone facies which consist of encrusted organism related to lagoon toward the reef such as algae and bryozoa, abundance of coral boundstone facies in a low volume but large quantity and absence of gravitational sediments, the sedimentary modal of the Qom Formation in Khani Abad section (southeast of Kashan) had to be considered as non-rimmed carbonate shelf (open shelf). In the middle and top of the stratigraphical column of the Qom Formation, the amount of benthic foraminifera with porcelaneous walls reduced, while the amount of bioclast increased, which indicates normal salinity during deposition of these parts. Regarding to the degree of light penetration and according to the porcelaneous and hyaline foraminifera, the euphotic to mesophotic zones can be suggested for the study section. Since most of the carbonate sediments were deposited in shallow depth of lagoonal environment, the matrix is dominant, therefore these sediments have undergone less diagenetic processes. Cementation and dolomitization were seen mostly in shoal microfacies parts.
 
Keywords: Qom Formation; microfacies; sedimentary environment; diagenetic processes; Central Iran.
 
References
Aghanabati, S.A., 2006. Geology of Iran. Geological Survey of Iran, 586p. (in Persian)
Daneshian J., Asadi Mehmandosti, E., & Ramezani-Dana, L., 2017. Microfacies, sedimentary environment and sequence stratigraphy of the Qom Formation in the Deh Namak section, northeast of Garmsar. Iranian Journal of Geology, 11 (41): 23-43 (in Persian with English abstract).
Dickson, J.A.D., 1965. A modified staining Technique for Carbonate in thin Section. Nature, p. 205.
Dunham, R.J., 1962. Classification of carbonate rocks according to depositional texture. In: Ham, W.E., (ed.), Classification of Carbonate Rocks- A symposium. American Association Petroleum Geologist, 1: 108-121.
Embry, A.F., & Klovan, J.E., 1971. A Late Devonian reef tract on northeastern Banks Islands, Northwest Territories. Bulletin of Canadian Petroleum Geology, 19: 730-781.
Flugel, E., 2010. Microfacies of Carbonate Rocks, Analysis, Interpretation and Application. Springer- Berlin, 984 p.
Folk, R.L., 1974. Petrology of sedimentary Rocks. Hemphill Publication Company, Austin, Texas, 182p.
Mazzullo, S.J., 1992. Geochemical and neomorphic alteration of dolomite: a review. Carbonates and Evaporites, 7: 21-37.
Mohammadi, E., Safari, A., Vaziri-Moghaddam, H., Mohammadi Monfared, M., 2009.  Microfacies analysis and depositional environment of the Qom Formation in the Jazeh area (South of Kashan). Sedimentary Facies, 2 (1): 81-93 (in Persian with English abstract).
Nasiri Ghareh-Shiran, M., 2017. Microfacies, diagenetic features and sequence stratigraphy of the Qom Formation in the Azeran section, Southwest of Kashan. Master Thesis, Kharazmi University, 131 p. (in Persian)
Pomar, L., 2001. Ecological control of sedimentary accommodation: evolution from a carbonate ramp to rimmed shelf, Upper Miocene, Balearic Isla lands. Palaeogeography, Palaeoclimatology, Palaeoecology, 175: 249- 272.
Reuter, M., Piller, W.E., Harzhauser, M., Mandic, O., Berning, B., Rogl, F., Kroh, A., Aubry, M.P., Wielandt-Schuster, U., & Hamedani, A., 2009. The Oligo-Miocene Qom Formation (Iran): evidence for an early Burdigalian restriction of Tethyan Seaway and closer of its Iranian getaways. International Journal of Earth Sciences, 98: 627-650.
Safari, A., Ameri, H., Vaziri, M.R., Mohammadi, E., 2014. Analysis of the Qom Formation microfacies and controlling factors on their deposition, Varkan area (Southwest of Kashan), Sanandaj-Sirjan forearc basin. Paleontology, 1 (2): 187-204 (in Persian).
Seyrafian, A., Torabi, H., Shojaei, M., 2007. Microfacies and sedimentary environment of the Qom Formation in Natanz area (Charkhe Mountain). Journal of Research Sciences, Isfahan University, 33: 137-150 (in Persian with English abstract).
Sibley, D.F., & Gregg, J.M., 1987. Classification of dolomite rock texture. Journal of Sedimentary Petrology, 57: 967-975.
Wilson, J.L., 1975. Carbonate Facies in Geologic History. Springer, New York, 471 p.

Keywords

• Qom Formation
• microfacies
• sedimentary environment
• diagenetic processes
• Central Iran

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References

آدابی، م.ح.، 1383. ژئوشیمی رسوبی. انتشارات آرین زمین، 476ص

اسدی مهماندوستی، ا.، دانشیان، ج.، مارگیر، ن.، 1397. بررسی داده‎های عنصری و تأثیر وانادیوم، کروم و نیکل در بازسازی شرایط اکسیداسیون احیا قدیمه سازند قم در برش خانی‌آباد، جنوب خاوری کاشان. پژوهش‎های چینه‎نگاری و رسوب‎شناسی، 70: 31-46.

بختیاری، س.، 1384. اطلس راههای ایران با مقیاس 1:1000000. مؤسسه جغرافیایی و کارتوگرافی گیتاشناسی، 288 ص.

آقانباتی، ع.، 1385. زمین شناسی ایران. سازمان زمین شناسی و اکتشافات معدنی کشور، 586 ص.

جعفریان، م.، طاهری، ع.، وزیری مقدم، ح.، 1385. بی‌مهرگان سنگواره (جلد دوم). انتشارات دانشگاه اصفهان، 360ص.

جلالی، م.، صادقی، ع.، آدابی.، ۱۳۹۶. ریزرخساره‌ها، محیط رسوبی و چینه نگاری سکانسی سازند قم در چاه یورته شاه- 1 و برش سطحی موره‌کوه (جنوب تهران). پژوهش‌های چینه نگاری و رسوب شناسی. 66: 25-48.

حسینی‌پور، ف.، حسنی، م.، داستانپور، م.، 1391. اویسترهای سنگ آهک گوری (میوسن پیشین) در شمال بندرعباس، ناحیه زاده محمود، جنوب خاوری حوضه زاگرس. فصلنامه علوم زمین، 91: 101–110.

دانشیان، ج.، اسدی مهماندوستی، ا.، رمضانی‌دانا، ل.، 1396. ریز رخساره، محیط رسوبی و چینه‎نگاری سکانسی سازند قم در برش ده‌نمک، شمال شرق گرمسار. فصلنامه زمین‎شناسی ایران، 41: 23-44

دانشیان، ج.، مشهدی، ع.، باغبانی، د.، اصیلیان، ح.، 1391. بیواستراتیگرافی نهشته‌های سازند قم بر اساس فرامینیفرا در برش کاروانسراسنگی در شمال غرب قم. اولین همایش زمین شناسی فلات ایران، دانشگاه تحصیلات تکمیلی صنعتی و فناوری پیشرفته کرمان، صص 69-75.

رحیم پوربناب، ح.، 1389. سنگ شناسی کربناته با نگرشی بر کیفیت مخزنی. انتشارات دانشگاه تهران، 554 ص.

صفری، ا.، عامری، ح.، وزیری، م. ر.، محمدی، ا.، 1392، ریزرخساره‌ها و محیط رسوبی سازند قم در ناحیه ورکان (جنوب غربی کاشان)، حوضه پیش‌کمان سنندج ـ سیرجان. دیرینه شناسی، 1 (2): 187-204.

صیرفیان، ع.، ترابی، ح.، شجاعی، م.، ۱۳۸۵. میکروفاسیس و محیط رسوبی سازند قم در منطقه نطنز (کوه چرخه). مجله پژوهشی علوم پایه دانشگاه اصفهان، 33: 137-۱50.

قاسم‬زاده، ش.، 1397. بیواستراتیگرافی و پالئواکولوژی سازند قم بر اساس فرامینیفرا در برش خانی آباد در جنوب شرق کاشان، پایان نامه کارشناسی ارشد، دانشگاه خوارزمی.

کاروان، م.، 1390. محیط رسوبی، دیاژنز و چینه ‌نگاری سکانسی نهشته‌های سازند قم در شمال‌شرقی دلیجان. پایان نامه کارشناسی ارشد، دانشگاه فردوسی مشهد، 115ص.

علامه، خ.، کنگازیان، ع، بلیوند، ر.، 1390. بررسی ریزرخساره‌ها و محیط رسوبی نهشته‌های بخش a سازند قم در ناحیه دو چاه (شمال غرب قم)، سوم خرداد. اولین همایش ملی زمین شناسی ایران، دانشگاه آزاد اسلامی واحد شیراز، صص 98-104.

محمدی، ا.، صفری، ا.، وزیری مقدم، ح.، محمدی منفرد، م.، 1388. بررسی ریزرخساره‌ها و محیط رسوبی سازند قم در ناحیه جزه (جنوب کاشان). رخساره‌های رسوبی، 2 (1): 81-94.

نادری، ا.، 1391. زیست چینه نگاری نهشته‌های سازند قم در برش خفر (شمال شرق نطنز). پایان نامه کارشناسی ارشد، دانشگاه خوارزمی. 118ص.

نصیری قره‌شیران، 1395. ریزرخساره‎ها، فرآیندهای دیاژنتیکی و چینه نگاری سکانسی سازند قم در برش آزران، جنوب غرب کاشان. پایان نامه کارشناسی ارشد، دانشگاه خوارزمی، 131ص.

نوری، م.، زهدی،ا.، کوهستانی، ح.، نباتیان، ق.، مختاری، م.، 1397. چینه شناسی، ریزرخساره‌ها و محیط رسوبی سازند قم در برش کانسار سلستین مادآباد، جنوب زنجان. رخساره‌های رسوبی، ۱۱ (۲): 288-303.

Adabi, M.H., & Rao, C.H., 1991. Petrographic and geochemical evidence for original aragonitic mineralogy of Upper Jurassic Carbonates (Mozduran Formation), Sarakhs area, Iran. Sedimentary Geology, 72: 253-267.

Adabi, M.H., 2002. Petrography and geochemical criteria for recognition of unaltered cold water and diagenetically altered Neoproterozoic dolomite, western Tasmania, Australia. 16th Australian Geology Convention, Australia (Abstract), p. 350.

Adams, A.E., & MacKenzie, W.S., 1998. A colour atlas of carbonate sediments and rocks under the Microscope. London Manson, p.180

Adey, W.H., 1986. Coralline red algae as indicators of sea-level. In: Van de Plassche, O., (ed.), Sea level research: a manual for the collection and evaluation of data. Free University, Amsterdam, p 229–279.

Al-Aasm, I., 2003. Origin and characterization of hydrothermal dolomite in the Western Canada Sedimentary Basin. Journal of Geochemical Exploration, 78: 9-15.

Bathurst, R.G.C., 1985. Carbonate sediments and their diagenesis. Elsevier, North Holland, p. 658

Bosence, D.W.J., 1991. Coralline algae: mineralogy, taxonomy and palaeoecology. In: Riding, R., (ed.), Calcareous algae and stromatolites. Springer, p. 98–113.

Braga, J.C., & Aguirre, J., 2001. Coralline algal assemblages in Upper Neogene reef and temperate carbonates in Southern Spain. Palaeogeography, Palaeoclimatology, Palaeoecology, 175: 27–41.

Brandano, M., Frezza, V., Tomassetti, L., & Cuffaro, M., 2008. Heterozoan carbonates in oligotrophic tropical waters: The attard member of the Lower coralline limestone Formation (Upper Oligocene, Malta). Palaeogeography, Palaeoclimatology, Palaeoecology, 272: 1-10.

Bjørlykke, K., 2014. Relationships between depositional environments, burial history and rock properties. Some principal aspects of diagenetic process in sedimentary basins. Sedimentary Geology, 301: 1-14.

Choquette, P.W., & Pray, L.C., 1975. Geologic nomenclature and classification of porosity in sedimentary carbonates, American Association of Petroleum Geologists Bulletin, 54: 207-250.

Cook, M.L., Simo, J.A., Underwood, C.A., & Rijken, P., 2006. Mechanical stratigraphic controls on Fracture patterns within carbonates andimplications for groundwater flow. Sedimentary Geology, 184: 225-239.

Dickson, J.A.D., 1965. A modified staining Technique for Carbonate in thin Section. Nature, p. 205.

Dix, G.R., & Parras, A., 2014. Integrated diagenetic and sequence stratigraphy of a late Oligocene–early Miocene, mixed-sediment platform (Austral Basin, southern Patagonia): Resolving base-level and paleoceanographic changes, and paleoaquifer characteristics. Sedimentary Geology, 307: 17-33

Dunham, R.J., 1962. Classification of carbonate rocks according to depositional texture. In: Ham, W.E., (ed.), Classification of Carbonate Rocks- A symposium. American Association Petroleum Geologist, 1: 108-121.

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

Flugel, E., 2010. Microfacies of Carbonate Rocks, Analysis, Interpretation and Application. Springer- Berlin, 984p.

Folk, R.L., 1974. Petrology of sedimentary Rocks. Hemphill Publication Company, Austin, Texas, 182p.

Guzzy-Arredondo, G.S., Murillo-Muñeton, G., Moran-Zenteno, D.J., Grajales-Nishimura, J.M., Martinez-Ibarra, R., & Schaaf, P., 2007. High-temperature dolomite in the Lower Cretaceous Cupido Formation, Bustamante Canyon, northeast Mexico: petrologic, geochemical and microthermometric constraints, Revista Mexicana de Ciencias Geologicas, 24: 131-149.

Geel, T., 2000. Recognition of stratigraphic sequence in carbonate platform and slope deposits: empirical models based on microfacies analysis of Palaeogene deposits in southeastern Spain. Palaeogeography, Palaeoclimatology, Palaeoecology, 155: 211-238.

Gregg, J.M., Bish, D.L., Kaczmarek, S.E., & Machel, H.G., 2015. Mineralogy, nucleation and growth of dolomite in the laboratory and sedimentary environment: A review. Sedimentology, 62 (6): 1749-1769

Hardwood, G.M., 1988. Principles of sedimentary petrography. In: Tucker, M.E., (ed.), Technique in Sedimentology. Blackwell, Oxford. p. 108-174.

Hood, S.D., Nelson, C.S., & Kamp, P.J.J., 2004. Burial dolomitisation in a non tropical carbonate petroleum reservoir: the Oligocene Tikorangi Formation, Taranaki Basin, New Zealand. Sedimentary Geology, 172: 117-138.

Hou, Y., Azmy, K., Berra, F., Jadoul, F., Blamey, N.J.F., Gleeson, S.A., & Brand, U., 2016. Origin of the Breno and Esino dolomites in the western Southern Alps (Italy): implication for a volcanic influence. Marine and Petroleum Geology, 69: 38-52. 

Houshmand-Zadeh, A., & Nabavi, M.H., 1999. Geological Map of Kuh-e-Latif, 1:100000 scale. Geological Survey of Iran.

Kabanov, P.B., 2000. Grain micritization as facial indicator in shallow water marine carbonate rocks: Byulleten’ Moskovskogo Obshchestva Ispytateley Prirody. Otdel Geologicheskiy, 75 (4): 39–48.

Khan, Z., Sachan, H.K., Ahmad, A.H.M., & Ghaznavi, A.A., 2019. Microfacies, diagenesis, and stable isotope analysis of the Jurassic Jumara Dome carbonates, Kachchh, Western India: Implications for depositional environments and reservoir quality. Geological Journal, 55: 1041-1061.

0;

55

:1041

–1061

Kirmaci, M.Z., & Akdag, K., 2005. Origine of dolomite in late Cretaceous-Paleocene Limestone turbidities, Eastern Pontides, Turkey. Sedimentary Geology, 81: 39-57.

Longman, M.W., 1980. Carbonate diagenetic texture from nearshore diagenetic environment, American Association Petroleum Geologist Bulletin, 64: 461-487.

Lucia, F.J., 2007. Carbonate Reservoir Characterization. Springer-Verlag, Berlin, Heidelberg, 331 p.

Machel, H.G., Borrero, M.L., Dembicki, E., Huebscher, H., Ping, L., & Zhao, Y., 2012. The Grosmont: a complex dolomitized, fractured and karstified heavy oil reservoir in a Devonian carbonate-evaporite platform. CSPG/CSEG/CWLS GeoConvention 2012, (Vision) Calgary TELUS Convention Centre & ERCB Core Research Centre, Calgary, AB, Canada, 14-18 May 2012.

Mazzullo, S.J., 1992. Geochemical and neomorphic alteration of dolomite: a review. Carbonates and Evaporites, 7: 21-37.

Moore, C.H., 1989. Carbonate Diagenesis and Porosity. Elsevier, Amsterdam, 338p.

Ngia, N.R., Hu, M., & Gao, D., 2019. Tectonic and geothermal controls on dolomitization and dolomitizing fluid flows in the Cambrian-Lower Ordovician carbonate successions in the western and central Tarim Basin, NW China. Journal of Asian Earth Sciences, 172: 359-382.

Pomar, L., 2001. Ecological control of sedimentary accommodation: evolution from a carbonate ramp to rimmed shelf, Upper Miocene, Balearic Isla lands. Palaeogeography, Palaeoclimatology, Palaeoecology, 175: 249- 272.

Pomar, L., Mateu-Vicens, G., Morsilli, M., & Brandano, M., 2014. Carbonate ramp evolution during the Late Oligocene (Chattian), Salento Peninsula, southern Italy. Palaeogeography, Palaeoclimatology, Palaeoecology, 404: 109-132.

Reuter, M., Piller, W.E., Harzhauser, M., Mandic, O., Berning, B., Rogl, F., Kroh, A., Aubry, M.P., Wielandt- Schuster, U., & Hamedani, A., 2009. The Oligo-Miocene Qom Formation (Iran): evidence for an early Burdigalian restriction of Tethyan Seaway and closer of its Iranian getaways. International Journal of Earth Sciences, 98: 627-650.

Shinn, E.A., 1969. Submarine Lithification of Holocene Carbonate Sediment in the Persian Gulf. Sedimentology, 12: 109-144.

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

Stocklin, J., 1968. Structural history and tectonics of Iran: a review. The American Association of Petroleum Geologists Bulletin, 52 (7): 1229–1258

Stocklin, J., & Setudehina, A., 1991. Stratigraphic lexicon of Iran. Geological Survey of Iran. 18: 1–376.

Srinivasan, K., Walker, K.R., & Goldberg, S.A., 1994. Determining fluid source and possible pathways during burial dolomitization of Maryville Limestone (Cambrian), Southern Appalachians, USA. Sedimentology, 41: 293-308.

Tucker, M.E., & Wright, V.P., 1990. Carbonate sedimentology. Blackwell, Oxford, 482 p.

Tucker, M.E., 1991. Sedimentary petrology: an introduction to the origin of sedimentary rocks. Blackwell, Science Publication, London, 260 p.

Wei, L.M., 1995. Study on the micritization of carbonate grains by bacteria and algae. Acta Sedimentologica Sinica, 13 (3): 89–97.

Warren, J.K., 2000. Dolomite: occurrence, evolution and economically important association. Earth Science Reviews, 52: 1-81.

Wilson, J.L., 1975. Carbonate Facies in Geologic History. Springer, New York, 471 p.