Biofacies Analysis of the Upper Oligocene Deposits (Qom Formation) in Urumieh Dokhtar Zone, Iran
In order to determine the accurate paleoenvironmental conditions of Qom Formation, one stratigraphic section was studied in the Urumieh-Dokhtar Zone (West of Ashtian). 60 thin sections of the Qom Formation, 71 m thick, were prepared and the distribution of benthic foraminifera was analyzed. On the b...
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| Language: | English |
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Universidade Federal do Rio de Janeiro
2019
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| Online Access: | https://revistas.ufrj.br/index.php/aigeo/article/view/25225 https://doi.org/10.11137/2017_2_163_179 |
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ftufriodejaneiro:oai:www.revistas.ufrj.br:article/25225 |
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openpolar |
| institution |
Open Polar |
| collection |
Portal de Periódicos da UFRJ (Universidade Federal do Rio de Janeiro) |
| op_collection_id |
ftufriodejaneiro |
| language |
English |
| topic |
Qom Formation Miocene Paleoenvironment Ramp Urumieh Dokhtar Iran |
| spellingShingle |
Qom Formation Miocene Paleoenvironment Ramp Urumieh Dokhtar Iran Moghadam, Iraj Maghfori Holakouee, Zohre Yazdi, Mehdi Yousefi, Bizhan Biofacies Analysis of the Upper Oligocene Deposits (Qom Formation) in Urumieh Dokhtar Zone, Iran |
| topic_facet |
Qom Formation Miocene Paleoenvironment Ramp Urumieh Dokhtar Iran |
| description |
In order to determine the accurate paleoenvironmental conditions of Qom Formation, one stratigraphic section was studied in the Urumieh-Dokhtar Zone (West of Ashtian). 60 thin sections of the Qom Formation, 71 m thick, were prepared and the distribution of benthic foraminifera was analyzed. On the basis of the recognized foraminifera, the age of Qom Formation in the studied section is assigned to the Late Oligocene (Chattian). In this study, sex different biofacies and two lithofacies types have been recognized, that can be grouped into two depositional environments, back ramp (alluvium channel, lagoon and shoal) and the ramp (inner, middle and outer ramp). The alluvium channel is characterized by Gms (gravel with massive layering and abundant matrix). The shoal is represented by fine to medium sandstone: calcite cemented submature litharenite. The lagoon is dominated by the presence of bioclastic bryozoan corallinacea wackestone- packstone and bioclastic foraminifera corallinacean wackstone to packstone. The inner ramp is characterized by bioclastic benthic foraminifera (perforate and imperforate) wackestone-packstone and the middle ramp represented by bioclastic perforate foraminifera wackstone-packstone and bioclastic Operculina packstone. Outer ramp is characterized by bioclast benthic and planktonic foraminifera mudstone. |
| format |
Article in Journal/Newspaper |
| author |
Moghadam, Iraj Maghfori Holakouee, Zohre Yazdi, Mehdi Yousefi, Bizhan |
| author_facet |
Moghadam, Iraj Maghfori Holakouee, Zohre Yazdi, Mehdi Yousefi, Bizhan |
| author_sort |
Moghadam, Iraj Maghfori |
| title |
Biofacies Analysis of the Upper Oligocene Deposits (Qom Formation) in Urumieh Dokhtar Zone, Iran |
| title_short |
Biofacies Analysis of the Upper Oligocene Deposits (Qom Formation) in Urumieh Dokhtar Zone, Iran |
| title_full |
Biofacies Analysis of the Upper Oligocene Deposits (Qom Formation) in Urumieh Dokhtar Zone, Iran |
| title_fullStr |
Biofacies Analysis of the Upper Oligocene Deposits (Qom Formation) in Urumieh Dokhtar Zone, Iran |
| title_full_unstemmed |
Biofacies Analysis of the Upper Oligocene Deposits (Qom Formation) in Urumieh Dokhtar Zone, Iran |
| title_sort |
biofacies analysis of the upper oligocene deposits (qom formation) in urumieh dokhtar zone, iran |
| publisher |
Universidade Federal do Rio de Janeiro |
| publishDate |
2019 |
| url |
https://revistas.ufrj.br/index.php/aigeo/article/view/25225 https://doi.org/10.11137/2017_2_163_179 |
| long_lat |
ENVELOPE(166.433,166.433,-77.633,-77.633) ENVELOPE(-38.305,-38.305,-53.990,-53.990) |
| geographic |
Ramp The The Ramp |
| geographic_facet |
Ramp The The Ramp |
| genre |
Planktonic foraminifera |
| genre_facet |
Planktonic foraminifera |
| op_source |
Anuário do Instituto de Geociências; v. 40, n. 2 (2017); 163-179 1982-3908 0101-9759 |
| op_relation |
https://revistas.ufrj.br/index.php/aigeo/article/view/25225/13755 Abaie, I.; Ansari, H.; Badakhshan, A. & Jaafari, A. 1964. History and development of the Alborz and Sarajeh Fields of Central Iran. Bulletin Iranian Petroleum Institute, 15: 561-574. Adams, T.D. & Bourgeois, F. 1967. Asmari biostratigraphy. Geological and Exploration Division. Iranian Oil Offshore Company Report number, 1074 (Unpublished). Amin Rasouli, H. 2005. Sequence stratigraphy of the Qom Formation in south Central Iran. PhD, Tarbyat Moalem University, Tehran, Iran. (In Persian). Amirshahkarami, M. & Karavan, M. 2015. Microfacies models and sequence stratigraphic architecture of the Oligocene Miocene Qom Formation, south of Qom City, Iran. Geosciences Frontiers, 6: 593- 404. Amirshahkarami, M.; Vaziri-Moghaddam, H. & Taheri, A. 2007. Sedimentary facies and sequence stratigraphy of the Asmari Formation at Chaman-Bolbol, Zagros Basin, Iran. Journal of Asian Earth Sciences, 29: 947-959. Bassi, D.; Hottinger, L. & Nebelsick, H. 2007. Larger Foraminifera from the Upper Oligocene of the Upper Oligocene of the Venetian area, northeast Italy, Palaeontology, 5(4): 845-868. Beavington-Penny, S.J. & Racey, A. 2004. Ecology of extant nummulitids and other larger benthic foraminifera application in paleoenvironmental analysis. Earth Sciences Review, 67: 219-265. Bozorgnia, F. 1966. Qum Formation stratigraphy of the Central Basin of Iran and its intercontinental position. Bulletin Iranian Petroleum Institute, 24: 69-76. Brandona, M. & Corda, L. 2002. Nutrients, sea level and tectonics, constrains for the facies architecture of a Miocene carbonate ramp in central Italy. Terra Nova, 14: 257-262. 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 Malta). Palaeogeography, Palaeoclimatology, Palaeoecology, 272: 1-10. Brandano, M.; Morsilli, M.; Vannucci, G.; Parente, M.; Bosellini, F. & Vicens, G. 2010. Rhodolith-rich lithofacies of the Porto Badisco Calcarenites (Upper Chattian, Salento and Southern Italy). Italian Journal Geosciences, 129(1): 119-131. Burchette, T.P. & Wright, V.P. 1992. Carbonate ramp depositional systems. Sedimentary Geology, 79(1-4): 3-57. Corda, L. & Brandano, M. 2003. Aphotic zone carbonate production on a Miocene ramp, central Apennines, Italy. Sedimentary Geology, 161(1-2): 55-70. Cosovic, V.; Drobne, K. & Moro, A. 2004. Paleoenvironmental model for Eocene foraminiferal limestones of the Adriatic carbonate platform (Istrian Peninsula). Facies, 50(1): 61-75. Daneshian, J. & Ramezani Dana, L. 2007. Early Miocene benthic foraminifera and biostratigraphy of the Qom Formation, Deh Namak, Central Iran. Journal of Asian Earth Sciences, 29: 844-858. Dunham, R.J. 1962. Classification of carbonate rocks according to depositional texture. In: HAMM, W.E. (Ed.), Classification of carbonate rocks: a symposium. AAPG, 1: 108-121. Ehrenberg, S.N.; Pickard, N.A.H.; Laursen, G.V.; Monibi, S.; Mossadegh, Z.K.; Svana, T.A.; Aqrawi, A.A.M.; McArthur, J.M. & Thirlwall, M.F. 2007. Strontium isotope stratigraphy of the Asmari Formation (Oligocene–Lower Miocene), SW Iran, Journal of Petroleum Geology, l30: 107-128. Emami, H. 1991. Geological Map of Qom, 1:00000, Geological Survey of Iran. Flügel, E. 2010. Microfacies of Carbonate Rocks, Analysis, Interpretation and Application. Berlin, Springer- Verlag, 976p. Furrer, M. & Suder, P. 1955. The Oligo-Miocene marine formation in the Qum region (Central Iran). In: THE 4TH WORLD PETROLEUM CONGRESS PROCEEDINGS, p. 267-277. Geel. T. 2000. Recognition of stratigraphic sequence in carbonate platform and slope: empirical models based on microfacies analysis of Paleogene deposits in southeastern Spain. Palaeogeography, Palaeoclimatology, Palaeoecology, 155: 211-238. Hallock, P. 1985. Why are larger Foraminifera larger? Paleoobiology, 11: 195-208. Hallock, P. 1999. Symbiont bearing foraminifera. In: SEN GUPTA B.K. (Ed.), Modern foraminifera. Amsterdam, Kluwer Academic, p. 123-139. Hallock, P. & Glenn, E.C. 1986. Larger foraminifera: a tool for paleoenvironmental analysis of Cenozoic depositional facies. Palaios, 1: 55-64. Heydari, E.; Hassanzadeh, J.; Wade, W.J. & Ghazi, A.M. 2003. Permian–Triassic boundary interval in the Abadeh section of Iran with implications for mass extinction. Palaeogeography, Palaeoclimatology, Palaeoecology, 193: 405-423. Karvan, M.; Mahboubi, A.; Vaziri-Moghaddam, H. & Moussavi- Harami, R. 2015. Sedimentary facies analysis and sequence stratigraphy of Qom Formation deposits in NE Delijan-NW Central Iran, Iran. Geosciences Journal, 24(94): 237-248 Lee, J.J. 1990. Fine structure of rodophycean profyridium purpureum insitu in Peneroplis pertusus and P. asicularis. Journal of Foraminifera Researches, 20: 162-169. Loftus, W.K. 1855. On the geology of portions of the Turko- Persian frontier and of the districts adjoining. The Quarterly Journal of the Geological Society of London, 11: 247-344. Mateu-Vicens, G.; Hallock. P. & Brandano, M. 2009. Test shape variability of Amphistegina d’Orbigny, 1826 as a paleobathymetric proxy: application to two Miocene examples. In: DEMCHUK, T. & GARY. A. (Eds.), Geologic Problems Solving with Microfossils. SEPM Special, 93: 67-82. Miall. A.D. 2006. The Geology of Fluvial Deposits Sedimentary Facies Basin Analysis and Petroleum Geology. Berlin, Springer, 582p. Mial, A.D. 1977. A review of braided river depositional environment. Earth Science Reviews, 13: 1-62. Mohammadi, E.; Hasanzadeh-Dastgerdi, M.; Ghaedi, M.; Dehghan, R. Safari, A.; Vaziri-Moghaddam, H.; Baizidi, C. & Sfidari, E. 2013. The Tethyan Seaway Iranian Plate Oligo-Miocene deposits (the Qom Formation): distribution of Rupelian (Early Oligocene) and evaporate deposits as evidences for timing and trending of opening and closure of the Tethyan Seaway. Carbonate Evaporite, 28: 321-345. Mohammadi, M.; Kohansal Ghadimvand, N.; Vaziri, S.H. & Mosavian, M. 2010. Facies analysis and depositional environments of the Qom Formation in Vieh section, south of Saveh. The 1st. International Applied Geological Congress proceedings, 1: 2019- 2024. Mohammadi, E.; Safari, A.; Vaziri-Moghaddam, H.; Vaziri, M.R. & Ghaedi, M. 2011. Microfacies analysis and paleoenviornmental interpretation of the Qom Formation, south of the Kashan, Central Iran. Carbonate Evaporite, 26: 255-271. Mohammadi, E.; Vaziri, M.R. & Dastanpour, M. 2013. Biostratigraphy of the nummulitids and lepidocyclinids bearing Qom Formation based on larger benthic foraminifera (Sanandaj–Sirjan fore-arc basin and Central Iran back-arc basin, Iran). Arabian Geosciences, 13: 1136-1146. Mossadegh, Z.K.; Haig, D.W.; Allan, T.; Hdabi, M.H & Sadeghi, A. 2009. Salinity changes during late Oligocene to early Miocene Asmari Formation deposition, Zagros mountains, Iran. Palaeogeography, Palaeoclimatology, Palaeoecology , 272: 17-36. Murray, J.M. 1991. Ecology and Paleoecology of Benthic Foraminifera. New York, Longman, 397p. Nebelsick, J.H.; Rasser, M. & Bassi, D. 2005. Facies dynamics in Eocene to Oligocene circumalpine carbonates. Facies, 51: 197-216. Nouradini, M.; Azami, S.H.; Hamad, M.; Yazdi, M. & Ashouri, A.R. 2015. Foraminiferal paleoecology and paleoenvironmental reconstructions of the lower Miocene deposites of the Qom Formation in Northeastern Isfahan, Central Iran. Boletin de la Sociedad Geolόgica Mexicana, 67(1): 59-73. Pomar, L. 2001. Types of carbonate platforms: a genetic approach. Basin Research, 13: 313-334. Rasser, M.W.; Scheibner, C. & Mutti, M. 2005. Paleoenvironmental standard section for early Ilerdian tropical carbonate factories (Corbieres, France; Pyrenees, Spain). Facies, 51: 217-232. Reiss, Z. & Hottinger, L. 1984. The Gulf of Aqaba: Ecological Micropaleontology (Ecological Studies). Berlin, Springer, 354p. Renema, W. 2006. Large benthic foraminifera from the deep photic zone of a mixed siliciclastic-carbonate shelf of East Kalimantan: Indonesia. Marine Micropaleontology, 58: 73-82. Reuter, M.; Piller, W.; Harzhauser, M.; Mandic, O.; Berning, B.; Rögl, 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 the Tethyan Seaway and closure of its Iranian gateways. International Journal of Earth Sciences, 98: 627-650. Romero, J.; Caus, E. & Rossel, J. 2002: A model for the paleoenvironmental distribution of larger forazminifera based on late Middle Eocene deposits on the margin of the south Pyrenean basin (NE Spain). 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Sooltanian, N. & Seyrafian, A. 2011 Biostratigraphy and paleoecological implications in microfacies of the Asmari Formation (Oligocene), Naura anticline (Interior Fars of the Zagros Basin), Iran. Carbonates Evaporites, 26: 167-180. Tucker, M.E. 2001. Sedimentary Petrology: an introduction to the origin of sedimentary rocks. London, Blackwell Scientific Publication, 262p. Vaziri-Moghaddam, H.; Kimiagari, M. & Taheri, A. 2006. Depositional environment and sequence stratigraphy of the Oligo-Miocene Asmari Formation in SW Iran. Facies, 52(1): 41-51. Vaziri-Moghaddam, H.; Seyrafian, A.; Taheri, A. & Motiei, H. 2010. Oligocene-Miocene ramp system (Asmari Formation) in the NW of the Zagros basin, Iran: Microfacies, paleoenvironmental and depositional sequence. Revista Mexicana de Ciencias Geolόgicas, 27(1): 56-71. Vaziri-Moghaddam, H. & Torabi, H. 2004. Biofacies and sequence stratigraphy of the Oligocene succession, Central Basin, Iran. Neues Jahrbuch für Geologie und Paläontologie, 6: 321-344. Wilson, M.E.J. & Vecsei, A. 2005. The apparent paradox of abundant foramol facies in low latitudes: their environmental significance and effect on platform development. Earth Sciences Review, 69: 133-168. Wynd, J. 1965. Biofacies of Iranian oil consortium agreement area. Iranian Oil Offshore Company, Report 1082 (Unpublished). https://revistas.ufrj.br/index.php/aigeo/article/view/25225 doi:10.11137/2017_2_163_179 |
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ftufriodejaneiro:oai:www.revistas.ufrj.br:article/25225 2023-05-15T18:00:53+02:00 Biofacies Analysis of the Upper Oligocene Deposits (Qom Formation) in Urumieh Dokhtar Zone, Iran Moghadam, Iraj Maghfori Holakouee, Zohre Yazdi, Mehdi Yousefi, Bizhan 2019-05-13 application/pdf https://revistas.ufrj.br/index.php/aigeo/article/view/25225 https://doi.org/10.11137/2017_2_163_179 eng eng Universidade Federal do Rio de Janeiro https://revistas.ufrj.br/index.php/aigeo/article/view/25225/13755 Abaie, I.; Ansari, H.; Badakhshan, A. & Jaafari, A. 1964. History and development of the Alborz and Sarajeh Fields of Central Iran. Bulletin Iranian Petroleum Institute, 15: 561-574. Adams, T.D. & Bourgeois, F. 1967. Asmari biostratigraphy. Geological and Exploration Division. Iranian Oil Offshore Company Report number, 1074 (Unpublished). Amin Rasouli, H. 2005. Sequence stratigraphy of the Qom Formation in south Central Iran. PhD, Tarbyat Moalem University, Tehran, Iran. (In Persian). Amirshahkarami, M. & Karavan, M. 2015. Microfacies models and sequence stratigraphic architecture of the Oligocene Miocene Qom Formation, south of Qom City, Iran. Geosciences Frontiers, 6: 593- 404. Amirshahkarami, M.; Vaziri-Moghaddam, H. & Taheri, A. 2007. Sedimentary facies and sequence stratigraphy of the Asmari Formation at Chaman-Bolbol, Zagros Basin, Iran. Journal of Asian Earth Sciences, 29: 947-959. Bassi, D.; Hottinger, L. & Nebelsick, H. 2007. Larger Foraminifera from the Upper Oligocene of the Upper Oligocene of the Venetian area, northeast Italy, Palaeontology, 5(4): 845-868. Beavington-Penny, S.J. & Racey, A. 2004. Ecology of extant nummulitids and other larger benthic foraminifera application in paleoenvironmental analysis. Earth Sciences Review, 67: 219-265. Bozorgnia, F. 1966. Qum Formation stratigraphy of the Central Basin of Iran and its intercontinental position. Bulletin Iranian Petroleum Institute, 24: 69-76. Brandona, M. & Corda, L. 2002. Nutrients, sea level and tectonics, constrains for the facies architecture of a Miocene carbonate ramp in central Italy. Terra Nova, 14: 257-262. 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 Malta). Palaeogeography, Palaeoclimatology, Palaeoecology, 272: 1-10. Brandano, M.; Morsilli, M.; Vannucci, G.; Parente, M.; Bosellini, F. & Vicens, G. 2010. Rhodolith-rich lithofacies of the Porto Badisco Calcarenites (Upper Chattian, Salento and Southern Italy). Italian Journal Geosciences, 129(1): 119-131. Burchette, T.P. & Wright, V.P. 1992. Carbonate ramp depositional systems. Sedimentary Geology, 79(1-4): 3-57. Corda, L. & Brandano, M. 2003. Aphotic zone carbonate production on a Miocene ramp, central Apennines, Italy. Sedimentary Geology, 161(1-2): 55-70. Cosovic, V.; Drobne, K. & Moro, A. 2004. Paleoenvironmental model for Eocene foraminiferal limestones of the Adriatic carbonate platform (Istrian Peninsula). Facies, 50(1): 61-75. Daneshian, J. & Ramezani Dana, L. 2007. Early Miocene benthic foraminifera and biostratigraphy of the Qom Formation, Deh Namak, Central Iran. Journal of Asian Earth Sciences, 29: 844-858. Dunham, R.J. 1962. Classification of carbonate rocks according to depositional texture. In: HAMM, W.E. (Ed.), Classification of carbonate rocks: a symposium. AAPG, 1: 108-121. Ehrenberg, S.N.; Pickard, N.A.H.; Laursen, G.V.; Monibi, S.; Mossadegh, Z.K.; Svana, T.A.; Aqrawi, A.A.M.; McArthur, J.M. & Thirlwall, M.F. 2007. Strontium isotope stratigraphy of the Asmari Formation (Oligocene–Lower Miocene), SW Iran, Journal of Petroleum Geology, l30: 107-128. Emami, H. 1991. Geological Map of Qom, 1:00000, Geological Survey of Iran. Flügel, E. 2010. Microfacies of Carbonate Rocks, Analysis, Interpretation and Application. Berlin, Springer- Verlag, 976p. Furrer, M. & Suder, P. 1955. The Oligo-Miocene marine formation in the Qum region (Central Iran). In: THE 4TH WORLD PETROLEUM CONGRESS PROCEEDINGS, p. 267-277. Geel. T. 2000. Recognition of stratigraphic sequence in carbonate platform and slope: empirical models based on microfacies analysis of Paleogene deposits in southeastern Spain. Palaeogeography, Palaeoclimatology, Palaeoecology, 155: 211-238. Hallock, P. 1985. Why are larger Foraminifera larger? Paleoobiology, 11: 195-208. Hallock, P. 1999. Symbiont bearing foraminifera. In: SEN GUPTA B.K. (Ed.), Modern foraminifera. Amsterdam, Kluwer Academic, p. 123-139. Hallock, P. & Glenn, E.C. 1986. Larger foraminifera: a tool for paleoenvironmental analysis of Cenozoic depositional facies. Palaios, 1: 55-64. Heydari, E.; Hassanzadeh, J.; Wade, W.J. & Ghazi, A.M. 2003. Permian–Triassic boundary interval in the Abadeh section of Iran with implications for mass extinction. Palaeogeography, Palaeoclimatology, Palaeoecology, 193: 405-423. Karvan, M.; Mahboubi, A.; Vaziri-Moghaddam, H. & Moussavi- Harami, R. 2015. Sedimentary facies analysis and sequence stratigraphy of Qom Formation deposits in NE Delijan-NW Central Iran, Iran. Geosciences Journal, 24(94): 237-248 Lee, J.J. 1990. Fine structure of rodophycean profyridium purpureum insitu in Peneroplis pertusus and P. asicularis. Journal of Foraminifera Researches, 20: 162-169. Loftus, W.K. 1855. On the geology of portions of the Turko- Persian frontier and of the districts adjoining. The Quarterly Journal of the Geological Society of London, 11: 247-344. Mateu-Vicens, G.; Hallock. P. & Brandano, M. 2009. Test shape variability of Amphistegina d’Orbigny, 1826 as a paleobathymetric proxy: application to two Miocene examples. In: DEMCHUK, T. & GARY. A. (Eds.), Geologic Problems Solving with Microfossils. SEPM Special, 93: 67-82. Miall. A.D. 2006. The Geology of Fluvial Deposits Sedimentary Facies Basin Analysis and Petroleum Geology. Berlin, Springer, 582p. Mial, A.D. 1977. A review of braided river depositional environment. Earth Science Reviews, 13: 1-62. Mohammadi, E.; Hasanzadeh-Dastgerdi, M.; Ghaedi, M.; Dehghan, R. Safari, A.; Vaziri-Moghaddam, H.; Baizidi, C. & Sfidari, E. 2013. The Tethyan Seaway Iranian Plate Oligo-Miocene deposits (the Qom Formation): distribution of Rupelian (Early Oligocene) and evaporate deposits as evidences for timing and trending of opening and closure of the Tethyan Seaway. Carbonate Evaporite, 28: 321-345. Mohammadi, M.; Kohansal Ghadimvand, N.; Vaziri, S.H. & Mosavian, M. 2010. Facies analysis and depositional environments of the Qom Formation in Vieh section, south of Saveh. The 1st. International Applied Geological Congress proceedings, 1: 2019- 2024. Mohammadi, E.; Safari, A.; Vaziri-Moghaddam, H.; Vaziri, M.R. & Ghaedi, M. 2011. Microfacies analysis and paleoenviornmental interpretation of the Qom Formation, south of the Kashan, Central Iran. Carbonate Evaporite, 26: 255-271. Mohammadi, E.; Vaziri, M.R. & Dastanpour, M. 2013. Biostratigraphy of the nummulitids and lepidocyclinids bearing Qom Formation based on larger benthic foraminifera (Sanandaj–Sirjan fore-arc basin and Central Iran back-arc basin, Iran). Arabian Geosciences, 13: 1136-1146. Mossadegh, Z.K.; Haig, D.W.; Allan, T.; Hdabi, M.H & Sadeghi, A. 2009. Salinity changes during late Oligocene to early Miocene Asmari Formation deposition, Zagros mountains, Iran. Palaeogeography, Palaeoclimatology, Palaeoecology , 272: 17-36. Murray, J.M. 1991. Ecology and Paleoecology of Benthic Foraminifera. New York, Longman, 397p. Nebelsick, J.H.; Rasser, M. & Bassi, D. 2005. Facies dynamics in Eocene to Oligocene circumalpine carbonates. Facies, 51: 197-216. Nouradini, M.; Azami, S.H.; Hamad, M.; Yazdi, M. & Ashouri, A.R. 2015. Foraminiferal paleoecology and paleoenvironmental reconstructions of the lower Miocene deposites of the Qom Formation in Northeastern Isfahan, Central Iran. Boletin de la Sociedad Geolόgica Mexicana, 67(1): 59-73. Pomar, L. 2001. Types of carbonate platforms: a genetic approach. Basin Research, 13: 313-334. Rasser, M.W.; Scheibner, C. & Mutti, M. 2005. Paleoenvironmental standard section for early Ilerdian tropical carbonate factories (Corbieres, France; Pyrenees, Spain). Facies, 51: 217-232. Reiss, Z. & Hottinger, L. 1984. The Gulf of Aqaba: Ecological Micropaleontology (Ecological Studies). Berlin, Springer, 354p. Renema, W. 2006. Large benthic foraminifera from the deep photic zone of a mixed siliciclastic-carbonate shelf of East Kalimantan: Indonesia. Marine Micropaleontology, 58: 73-82. Reuter, M.; Piller, W.; Harzhauser, M.; Mandic, O.; Berning, B.; Rögl, 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 the Tethyan Seaway and closure of its Iranian gateways. International Journal of Earth Sciences, 98: 627-650. 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Iranian Oil Offshore Company, Report 1082 (Unpublished). https://revistas.ufrj.br/index.php/aigeo/article/view/25225 doi:10.11137/2017_2_163_179 Direitos autorais 2019 Anuário do Instituto de Geociências http://creativecommons.org/licenses/by/4.0 CC-BY Anuário do Instituto de Geociências; v. 40, n. 2 (2017); 163-179 1982-3908 0101-9759 Qom Formation Miocene Paleoenvironment Ramp Urumieh Dokhtar Iran info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2019 ftufriodejaneiro https://doi.org/10.11137/2017_2_163_179 2021-08-02T08:29:04Z In order to determine the accurate paleoenvironmental conditions of Qom Formation, one stratigraphic section was studied in the Urumieh-Dokhtar Zone (West of Ashtian). 60 thin sections of the Qom Formation, 71 m thick, were prepared and the distribution of benthic foraminifera was analyzed. On the basis of the recognized foraminifera, the age of Qom Formation in the studied section is assigned to the Late Oligocene (Chattian). In this study, sex different biofacies and two lithofacies types have been recognized, that can be grouped into two depositional environments, back ramp (alluvium channel, lagoon and shoal) and the ramp (inner, middle and outer ramp). The alluvium channel is characterized by Gms (gravel with massive layering and abundant matrix). The shoal is represented by fine to medium sandstone: calcite cemented submature litharenite. The lagoon is dominated by the presence of bioclastic bryozoan corallinacea wackestone- packstone and bioclastic foraminifera corallinacean wackstone to packstone. The inner ramp is characterized by bioclastic benthic foraminifera (perforate and imperforate) wackestone-packstone and the middle ramp represented by bioclastic perforate foraminifera wackstone-packstone and bioclastic Operculina packstone. Outer ramp is characterized by bioclast benthic and planktonic foraminifera mudstone. Article in Journal/Newspaper Planktonic foraminifera Portal de Periódicos da UFRJ (Universidade Federal do Rio de Janeiro) Ramp The ENVELOPE(166.433,166.433,-77.633,-77.633) The Ramp ENVELOPE(-38.305,-38.305,-53.990,-53.990) Anuário do Instituto de Geociências - UFRJ 40 2 163 179 |