Stratigraphy of the Upper Jurassic shallow marine carbonates of the Moghan area (NW Iran), with paleobiogeography implication on Alveosepta jaccardi (Schrodt, 1894)


1 Damghan University, School of Earth Sciences, 36716-41167 Damghan, Iran

2 National Iranian Oil Company Exploration Directorate, Sheikh Bahayi Square, 1994814695 Tehran, Iran


A micropaleontological study has been carried out on the samples collected from the Sarv Abad section, the oldest and only known Jurassic sedimentary rocks cropping out in the Moghan area. Studied sequence consists of carbonates bounded at both base and top by clastic deposits. Studied carbonate deposits provide an assemblage of benthic foraminifera as well as calcareous algae. The stratigraphic distribution of the larger benthic foraminifera, particularly, almost consistent present of Alveosepta jaccardi allowed us to propose an age of Late Oxfordian to Early Kimmeridgian for the studied succession. At this time, Paratethys Basin was at very beginning of its opening. Larger benthic foraminifera and inhabited fauna at this basin are in close similarity with Tethyan Realm association. Data provided by larger foraminifera, calcareous algae, and microfacies analysis may suggest an environment of warm shallow water with low to medium energy regime


Article Title [Persian]

چینه شناسی واحدهای کربناته کم عمق ژوراسیک درمنطقه مغان (شمال غرب ایران) با تکیه برپالئوبیوژئوگرافی گونه آلوئوسپتا جاکاردای (شرودت، 1893)

Author [Persian]

  • مهدی صرفی 1
1 دانشگاه دامغان ،دانشکده علوم زمین 36716-41167، ایران
2 شرکت نفت تهران
Abstract [Persian]

در این مطالعه ریز دیرینه شناسی نمونه های جمع آوری شده از رخنمون سرواباد به عنوان تنها رخنمون شناخته شده از رسوبات ژوراسیک ناحیه مغان که از همین روی قدیمی ترین واحد سنگی این منطقه است مورد مطالعه و بررسی قرار گرفته است. رسوبات کربناته مورد مطالعه در قاعده و راس توسط رسوبات تخریبی پوشیده شده است.این رسوبات مجموعه نسبتا غنی از فرامینیفرهای بنتیک بزرگ و جلبک های آهکی را در برداشته و با استفاده از گسترش چینه شناسی نمونه های مذکور و خصوصا گونه آلوئوسپتا جاکاردای سن آکسفوردین پسین و کیمیریجین پیشین برای این رسوبات پیشنهاد گردیده است. در این زمان پاراتتیس در اولین مراحل توسعه قرار داشته و فونای به دست آمده از این مطالعه شباهت زیادی با فونای مناطق همجوار در تتیس نشان می دهد. نتایج به دست امده از میکروفسیل ها و مطالعات میکروفاسیس محیط رسوبی گرم و کم عمق با شرایط انرژی دیرینه کم تا متوسط را نشان می دهد.

Keywords [Persian]

  • پاراتتیس
  • مغان
  • ژوراسیک پایانی
  • فرامینیفرهای بنتیک بزرگ
  • آلوئوسپتا جاکاردای
Abrams, M.A., Narimanov, A. A., 1997. Geochemical evaluation of hydrocarbons and their potential sources in the western South Caspian depression, Republic of Azerbaijan. Marine and Petroleum Geology, 14(4): 451- 468.
Aghaei, A., Mahboubi, A., Moussavi-Harami, R., Heubeck, C., Nadjafi, M., 2013. Facies analysis and sequence stratigraphy of an Upper Jurassic carbonate ramp in the Eastern Alborz range and Binalud Mountains, NE Iran. Facies, 59(4): 863-889.
Aghanabati, M., 2004. Geology of Iran (in Farsi). Tehran: Geological Survey of Iran.
Al-Wosabi, M., 2005. Stratigraphy of the Middle–Late Jurassic foraminifera in the western and northwestern regions of Sana’a Basin, Republic of Yemen. Fac Sci Bull Sana’a Univ, 18: 71-114.
Amini, A., 2006. Oligo-Miocene fluvial-dominated deltas on the shelf of the South Caspian Sea (Paratethys). Facies, 52(4): 579-597.
Bagi, H., Tasli, K., Hamedani, A., 2006. Microfacies and paleoenvironmental interpretation of the Upper Jurassic Esfandiar Formation (east-central IRAN). Carbonates and evaporites, 21(2): 115-123.
Bassoullet, J., 1997. Les grands foraminifères. Biostratigraphie du Jurassique ouest-européen et Méditerranéen: zonations paralléles et distribution et microfossiles. Bull Centres Rech Explor-Prod Elf-Aquitaine Mém, 17: 293-304.
Betzler, C., Pawellek, T., Abdullah, M., Kossler, A., 2007. Facies and stratigraphic architecture of the Korallenoolith Formation in North Germany (Lauensteiner pass, Ith mountains). Sedimentary Geology, 194(1): 61-75.
Bismuth, H., Bonnefous, J., Dufaure, P., 1967. Mesozoic microfacies of Tunisia. Guidebook to the Geology and History of Tunisia: 159-214.
Bouaouda, M.S., Peybernes, B., Boutakiout, M., 2004. Complex benthic foraminifera of the Upper Bathonian to Lower Kimeridgian from the Moroccan Atlantic margin (Agadir “basin”): stratigraphy and paleobiogeography. Revue de Micropaleontologie, 47(1): 13-27.
Brunet, M.-F., Korotaev, M.V., Ershov, A.V., Nikishin, A.M., 2003. The South Caspian Basin: a review of its evolution from subsidence modelling. Sedimentary Geology, 156(1): 119-148.
Bucur, I.I., Sasaran, E., 2005. Micropaleontological assemblages from the Upper Jurassic-Lower Cretaceous deposits of Trascău Mountains and their biostratigraphic significance. Acta Paleontologica Romaniae, 5: 27-38.
Clark, G.N., Boudagher-Fadel, M.K., 2001. The larger benthic foraminifera and stratigraphy of the Upper Jurassic/Lower Cretaceous of Central Lebanon. Revue de micropaleontologie, 44(3): 215-232.
Dunham, R.J., 1962. "Classification of carbonate rocks according to depositional texture". In Ham, W.E. Classification of carbonate rocks. American Association of Petroleum Geologists Memoir, 1: 108-121.
Ghasemi-Nejad, E., Sabbaghiyan, H., Mosaddegh, H., 2012. Palaeobiogeographic implications of late Bajocian–late Callovian (Middle Jurassic) dinoflagellate cysts from the Central Alborz Mountains, northern Iran. Journal of Asian Earth Sciences, 43(1): 1-10.
Gollesstaneh, A., 1965. A micropalaeontological study of the Upper Jurassic and Lower Cretaceous of Southern Iran, University of London.
Guliyev, I., Mamedov, P., Feyzullayev, A., Huseynov, D., Kadirov, F., Aliyeva, E., Tagiyev, M., 2003. Hydrocarbon systems of the South Caspian basin. Nafta-Press, Baku.
Hottinger, L., 1967. Foraminifères imperforés du Mésozoique marocain. Service Géologique du Maroc.
Hughes, G., 2000. Saudi Arabian Late Jurassic and Early Cretaceous agglutinated foraminiferal associations and their application for age, palaeoenvironmental interpretation, sequence stratigraphy, and carbonate reservoir architecture. Grzybowski Found Spec Publ, 7: 149-165.
Hughes, G., 2004. Middle to Upper Jurassic Saudi Arabian carbonate petroleum reservoirs: biostratigraphy, micropalaeontology and palaeoenvironments. GeoArabia, 9(3): 79- 114.
Jones, R., Simmons, M., 1998. A review of the stratigraphy of Eastern Paratethys (Oligocene-Holocene), with particular emphasis on the Black Sea. Memoirs-American  Association of Petroleum Geologists: 39-52.
Khalatbari-Jafari, M., 2005. Geological map of the Razi, Geological survey of Iran, scale 1:100,000.
Kochhann, K.G.D., Bergue, C.T., Falahatgar, M., Javidan, M., Parent, H., 2015. Bebthic foraminifera and ostracoda from the Dalichai Formation (Aalenian–Bajocian) at Telma-Dareh, Alborz Mountain, Northern  IRAN. Revista Brasliera de paleontologia, 18(1): 3-20.
Parent, H., Weis, R., Mariotti, N., Falahatgar, M., Schweigert, G., Javidan, M., 2013. Middle Jurassic belemnites and ammonites (Cephalopoda) from Telma-Dareh, northern Iran. Rivista Italiana di Paleontologia e Stratigrafia (Research In Paleontology and Stratigraphy), 119(2): 163-174.
Pélissié, T., Peybernès, B., 1982. Étude micropaléontologique du Jurassique moyen/supérieur du Causse de Limogne (Quercy). Revue de micropaléontologie, 25(2): 111-132.
Pélissié, T., Peybernes, B., Rey, J., 1984. Larger benthic foraminifera from the Middle/Upper Jurassic of SW France (Aquitaine, Causses, Pyrenees): biostratigraphy, paleoecologic and paleobiogeographic interest. In Oertli, H.J. (ed.). Benthos 83: 479-489.
PPZ, 2013. Biostratigraphy and micropaleontological final report on the drilled wells and stratigraphic sections of the Moghan area. NIOC Geological report no. 2317, vol. 2, 17.
Rahimzadeh, F., 1994. Geological map of the Moghan, Geological survey of Iran, scale 1:250,000.
Redmond, C., 1964. Lituolid foraminifera from the Jurassic and Cretaceous of Saudi Arabia. Micropaleontology, 10(4): 405-414.
Rögl, F., 1998. Paratethys Oligocene–Miocene stratigraphic correlation. Oligocene–Miocene foraminifera of the Central Paratethys. Abh senckenberg naturforsch Ges, 649: 3-7.
Sachsenhofer, R., Schulz, H.-M., 2006. Architecture of Lower Oligocene source rocks in the Alpine Foreland Basin: a model for syn-and post-depositional source-rock features in the Paratethyan realm. Petroleum Geoscience, 12(4): 363-377.
Schrodt, F., 1894. Das Vorkommen der Foraminiferen-Gattung Cyclammina im oberen Jura. Zeitschrift der Deutschen Geologischen Gesellschaft: 733-735.
Schulz, H.-M., Bechtel, A., Sachsenhofer, R., 2005. The birth of the Paratethys during the Early Oligocene: From Tethys to an ancient Black Sea analogue? Global and Planetary Change, 49(3): 163-176.
Seyed-Emami, K., Schairer, G., 2011. Late Jurassic (Oxfordian, Bifurcatus and Bimammatum zones) ammonites from the eastern Alborz Mountains, Iran; second part. Neues Jahrbuch für Geologie und Paläontologie-Abhandlungen, 260(1): 11-20.
Simmons, M., 1998. Biostratigraphy; surviving extinction. Palaios, 13(3): 215-216.
Simmons, M., Al-Thour, K., 1994. Micropaleontological biozonation of the Amran Series (Jurassic) in the Sana’a region, Yemen Republic. Micropalaeontology and hydrocarbon exploration in the Middle East: 43-61.
Tasli, K., 1993. Micropaléontologie, stratigraphie et environnement de dépôt des séries jurassiques à faciès de plate-forme de la région de Kale-Gümüshane (Pontides orientales, Turquie). Revue de micropaléontologie, 36(1): 45-65.
Zaman, S., 2014. Biostratigraphy and micropaleontological study on the drilling sequence of the Amir Abad no.1 well (Eastern Koppeh Dagh). NIOC Exploration Directorate. NIOC technical report no. 2199, pp. 1-10.
Zavarehi, A., Maghfuri Moghadam, I., 2000. Stratigraphy of the Akchagyl Formation in the Moghan area. Ulum-i Zamin, 9(37-38): 34-47.