Applications and limitations of benthonic foraminifera and calcareous algae in biozonation of the Tirgan Formation: examples from Taher-Abad and Eshlir stratigraphic sections in the Eastern Kopet-Dagh

Document Type : مقالات پژوهشی

Authors

• Soheil Hemmati ¹
• Abbas Ghaderi ¹
• Alireza Ashouri ¹
• Morteza Taherpour Khalilabad ²

¹ Ferdowsi University of Mashhad

² Islamic Azad University

10.22067/sed.facies.v9i2.49164

Abstract

Introduction
The Tirgan Formation, as a cliff forming carbonate stratigraphic unit, consists of medium to thick bedded gray limestone with some thin intercalations of shales, considered as a probable hydrocarbons reservoir rock in the Kopet-Dagh basin (Robert et al., 2014). Throughout the basin, this formation overlaid the red siliciclastic succession of the Shurijeh Formation and overlain by the gray shales of the Sarcheshmeh Formation. Relative age of the Tirgan Formation, especially on the western Kopet-Dagh sections, have been discussed in a lot of publications (e.g., Kalantari, 1969; Rivandi et al., 2010; Khodadadi & Hadavi, 2012; Carevic et al., 2013; Bucur et al., 2013; Taherpour et al., 2013). However the provided results are not practical for many of the sections particularly in the eastern parts of the basin. The outcomes of different biostratigraphical tools such as orbitolinids and calcareous nannofossils are dissimilar and it is not possible to find them in all paleoenvironments, especially in the shallower settings. Embryonic chambers of orbitolinids as the most important characters of their taxonomy (Schroeder et al., 2010) are absent in most of specimens, not possible to find them even in the serial sections. The previously introduced biozones based on the foraminifera are problematic and the name of some biozone maker fossils had been chosen in a wrong way (for example Dictyoconus arabicus in Rivandi et al., 2010). In addition, pelagic macrofauna like ammonites as the fundamental biostratigraphic tool for dating of the Cretaceous marine environments are invisible in the eastern outcrops of the Tirgan Formation. Due to these limitations, we try to use a new tool for biostratigraphy and provide a suitable explanation for relative age of the sequences at least in the Taher-Abad and Eshlir anticline sections, east of Kopeh-Dagh. These two stratigraphic sections are respectively located at the distance of 75 and 95 kilometers northeast of Mashhad City. Totally, more than 150 thin sections belong to 100 limestone samples have been prepared. Furthermore, 25 shale samples for palynological investigations were taken and studied.

Results and Discussion
Micropaleontological studies on the Tirgan Formation is led to identification of 17 genera and 21 species of the benthonic foraminifera and 16 genera and 20 species of the calcareous algae in the Taher-Abad section. They are as follow: Andersenolina alpina, Balkhania balkhanica, Charentia cuvillieri, Comaliamma sp., Dictyoconus sp., Haplophragmoides joukowskyi, Haplophragmoides sp., Istriloculina eliptica, Istriloculina sp., Lenticulina sp., Mayncina bulgarica, Melathrokerion valserinensis, Nautiloculina oolithica, Neotrocholina aptiensis, Orbitolinids, Palorbitolina lenticularis, Quinqueloculina sp., Rumanoloculina robusta, Rumanoloculina cf. pseudominima, Rumano-loculina sp., Torinosuella peneropliformis, Vercorsella scarsellai, Acicularia sp., Arabicodium sp., Boueina sp., Boueina hochstetteri, Cayeuxia sp., Carpathoporella sp., Coptocompylodon sp., Deloffrella sp., Deloffrella quercifoliipora, Girvanella sp., Halimedaceae, Holosporella sp., Kopetdagaria sphaerica, Marinella lugeoni, Montiella? elitzae, Neomeris cretacea, Permocaculus sp., Russoella radoicicae, Terquemella sp.. In addition, 17 genera and 19 species of benthonic foraminifera and 12 genera and 16 species of calcareous algae are recognized in the Eshlir section. They comprise Andersenolina alpina, Balkhania balkhanica, Charentia cuvillieri, Dictyoconus sp., Haplophragmoides joukowskyi, Istriloculina eliptica, Istriloculina sp., Lenticulina sp., Mayncina bulgarica, Melathrokerion valserinensis, Nautiloculina oolithica, Neotrocholina aptiensis, Novalesia cf. producta, Orbitolinids, Palorbitolina lenticularis, Quinqueloculina sp., Rumanoloculina robusta, Torinosuella peneropliformis, Vercosella arenata, Vercorsella scarsellai, Acicularia sp., Boueina sp., Boueina hochstetteri, Coptocampylodon sp., Deloffrella sp., Deloffrella quercifoliipora, Halimedaceae, Holosporella sp., Kopetdagaria sphaerica, Marinella lugeoni, Montiella? elitzae, Neomeris cretacea, Permocaculus sp., Russoella radoicicae, Terquemella sp.
The mentioned microfossils characterized three biozones in the sections: Palorbitolina lenticularis Range zone, Kopetdagaria sphaerica local zone and Balkhania balkhanica local zone. Palorbitolina lenticularis Range zone contains the first to last occurrences of the nominal species, demonstrates the Late Barremian – Early Aptain ages (Bachman & Hirsch, 2006) for the Taher-Abad section. This biozone is equivalent to two shorter local zones of Balkhania balkhanica and Kopetdagaria sphaerica. The first zone includes the entire existence of the Balkhania balkhanica, has a regional biostratigraphic value for the Late Barremian. The thickness of Balkhania balkhanica zone in the Taher-Abad and Eshlir sections is respectively 20.65 and 37 meters, includes the carbonate units of the lower part of the Tirgan Formation. The second zone comprises the whole range of Kopetdagaria sphaerica in the studied sections, confirms the Late Barremian to Earlier Aptian (Bedoulian). Because of the incompleteness of Palorbitolina lenticularis Range zone in the Eshlir section, it is not possible to simply use of that. Instead, the later defined shorter Balkhania balkhanica and Kopetdagaria sphaerica biozones are appropriately useful in the Eshlir section. This biozone has a thickness of 43.35 and 39.65 meters in Taher-Abad and Eshlir, occupies a major upper part of the carbonate rocks of these two sections.

Conclusion
In the absence of proper orbitolinid fauna as the index benthonic fossils of the Early Cretaceous (Late Barremian – Early Aptain), the Balkhania balkhanica and Kopetdagaria sphaerica biozones have a worthy performance in the age dating of the Tirgan Formation, particularly in the eastern Kopet-Dagh. These ages have been examined by palynological contents of the shaly intervals. Some species such as Cribroperidinium cf. tenuiceras, Muderongia staurota, Odontochitina operculata and Pseudoceratium pelliferum which formerly reported from the Late Barremian – Early Aptian strata of Australia and Egypt (e.g., Oosting et al., 2006; Deaf et al., 2015) confirm the proposed age by foraminifera and calcareous algae.

Key words: Tirgan Formation; Eshlir anticline; Taher-Abad; benthonic foraminifera; calcareous algae; Kopet-Dagh.

References
Bachmann, M., & Hirsch, F., 2006. Lower Cretaceous carbonate platform of the eastern Levant (Galilee and the Golan Heights): stratigraphy and second-order sea-level change. Cretaceous Research, 27: 487-512.
Bucur, I.I., Majidifard, M.R., Senowbari-Daryan, B., 2013. Early Cretaceous calcareous benthic microfossils from the eastern Alborz and western Kopet Dagh (northern Iran) and their stratigraphic significance. Acta Palaeont. Romaniae, 9 (1): 23-37.
Carevic, I., Taherpour Khalil Abad, M., Ljubovic-Obradovic, D., Vaziri, S.H., Mirkovic, M., Aryaei, A.A., Stejic, P., & Ashouri, A.R., 2013. Comparis ons between the Urgonian platform carbo nates from eastern Serbia (Carpatho-Balk anides) and northeast Iran (Kopet-Dagh Basin): Depositional facies, microfacies, biost ratigraphy, palaeoenvironments and palae oecology. Cretaceous Research, 40: 110-130.
Deaf, A. S., Harding, I. C., & Marshall, J. E. (2015). Early Cretaceous palynostratigraphy of the Abu Tunis 1x borehole, northern Western Desert, Egypt, with emphasis on the possible palaeoclimatic effect upon the range of Dicheiropollis etruscus in North Africa. Palynology, 1-29.
Kalantari, A., 1969. Foraminifera from the middle-Jurassic-Cretaceous successions of Kopet Dagh region (N.E. IRAN). Tehran, NIOC. Geol.Laboratories, Publication. no.3, Ph.D. thesis, London University.
Khodadadi, L., & Hadavi, F., (2012). Nannostratigraphy and palaeoecology of Tirgan and SarcheshmehFormations in Taher-Abad and Mozduran sections (East of Kopeh-Dagh), Sedimentary Facies, 5 (2): 196-210.
Oosting A.M., Leereveld H., Dickens G.R., Henderson R.A., Brinkhuis H., 2006. Correlation of Barremian-Aptian (mid-Cretaceous) dinoflagellate cyst ssemblages between the Tethyan and Austral realms. Cretaceous Research, Vol. 27, P. 792-813.
Rivandi, B., Najafi, M., Mousavi Harami, S.R., Mahboubi, A., Vahidinia, M., 2010. Biostratigraphy of the Tirgan Formation at Jozak and Chaman-bid areas, west of Kopet-Dagh basin. Journal of Stratigraphy and Sedimentary Researches, 26 (4): 89-110 [In Farsi].
Robert, A.M.M., Letouzey, J., Kavoosi, M.A., Sherkati, S., Müller, C., Vergés, J., & Aghababaei, A., 2014. Structural evolution of the Kopet Dagh fold-and-thrust belt (NE Iran) and interactions with the South Caspian Sea Basin and Amu Darya Basin. Marine and Petroleum Geology, 57: 68-87.
Schroeder, R., van Buchem, F.S.P., Cherchi, A., Baghbani, D., Vincent, B., Immenhauser, A., Granier, B., 2010. Revised orbitolinid biostratigraphic zonation for the Barremian –Aptian of the eastern Arabian Plate and implications for regional stratigraphic correlations. GeoArabia Special Publication 4 (1): 49-96.
Taherpour Khalil Abad, M., Schlagintweit, F., Vaziri, S.H., Aryaei, A.A., & Ashouri, A.R., 2013. Balkhania balkhanica Mamontova, 1966 (benthic foraminifera) and Kopetdagaria sphaerica Maslov, 1960 (dasycladalean alga) from the Lower Cretaceous Tirgan Formation of the Kopet Dagh mountain range (NE Iran) and their paleobiogeographic significance. Facies, 59 (1): 267–285.

Keywords

• Tirgan Formation
• Eshlir anticline
• Taher-Abad
• benthonic foraminifera
• calcareous algae
• Kopet-Dagh

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References

افشار حرب، ع.،1373. زمین شناسی ایران: زمین شناسی کپه داغ. سازمان زمین شناسی و اکتشافات معدنی کشور. 275.

آقانباتی، ع.، 1383. زمین‌شناسی ایران. سازمان زمین شناسی واکتشافات معدنی کشور، 586.

جوانبخت، م.، موسوی حرمی، س. ر.، محبوبی، ا.،1392. تاریخچه رسوبگذاری و چینه نگاری سکانسی سازند تیرگان (بارمین ـ آپسین) در نواحی غربی و مرکزی کپه داغ، شمال شرق ایران. رخساره‌های رسوبی، 6(2): 162-185.

خدادای، ل.، هادوی، ف.، 1391. نانواستراتیگرافی و پالئواکولوژی گذر سازندهای تیرگان و سرچشمه در دو برش مزدوران و طاهرآباد (شرق حوضه کپه داغ). نشریه علمی ـ پژوهشی رخساره های رسوبی، 5 (2): 196-210.

داوطلب، ا.، قاسمی نژاد، ا.، وحیدی نیا، م.، عاشوری، ع.ر.، ذبیهی، ف.، 1393. زیست چینه نگاری سازند تیرگان براساس پالینومورف‌ها و روزنداران کف‌زی در شرق حوضه رسوبی کپه داغ. هشتمین همایش انجمن دیرینه‌شناسی ایران، دانشگاه زنجان، 44.

ریوندی، ب.، نجفی، م.، موسوی حرمی، س. ر.، محبوبی، ا.، وحیدی نیا، م.، 1389. چینه نگاری زیستی سازند تیرگان در دو ناحیه جوزک و چمن بید واقع در غرب حوضه رسوبی کپه داغ. نشریه علمی- پژوهشی پژوهشهای چینه نگاری و رسوب شناسی، 26 (4): 110-89.

طاهر پور خلیل آباد، م.، وزیری، س.ح.، عاشوری، ع.ر.، 1394. معرفی گونه Palorbitolina lenticularis (Blumenbach, 1805)، تاکسون شاخص حوضه تتیس به همراه ویژگی‌های زیستی آن از حوضه رسوبی کپه‌داغ، شمال خاور ایران. 24 (92): 134-121.

طاهر پور خلیل آباد، م.، وزیری، س.ح.،آریایی، ع.ا.، عاشوری، ع.ر.، 1393. کاربرد روزن بران کف زی و جلبک های آهکی در تعیین مرز توالی های بارمین پسین- آپتین پیشین (مطالعه موردی سازند تیرگان در غرب حوضه رسوبی کپه داغ). دوفصل نامه علمی- پژوهشی دیرینه‌شناسی (تحت چاپ).

طاهر پور خلیل‌آباد، م.، 1392. چینه نگاری سنگی و ریز چینه نگاری زیستی (روزن‌داران و جلبک‌های آهکی) سازند تیرگان در حوضه رسوبی کپه داق، شمال شرق ایران. رساله دکتری تخصصی، دانشگاه آزاد اسلامی واحد تهران شمال،ص 417.

محقی، م.، هادوی، ف.، رحیمی، ب.، 1390. نانواستراتیگرافی مرز سازندهای تیرگان ـ سرچشمه دربرش قلعه زو (غرب کپه داغ). نشریه علمی ـ پژوهشی رخساره های رسوبی، 4 (1): 124-108.

موسوی زاده، س.م.ع.، محبوبی، ا، موسوی حرمی، س.ر.، نجفی، م.، 1387. رخسارههای رسوبی و چینه نگاری سکانسی سـازند تیرگان در برش‌های جوزک و چمن بید در غرب حوضه رسوبی کپه داغ و انطباق با نـواحی شـرق حوضـه. مجلـه پژوهشـی دانشگاه اصفهان (علوم پایه)، 32: 56-33.

هاشمیان، ن.، آریایی، ع.ا.، 1386. معرفی گونه‌های از خارپوستان سـازند تیرگـان. اولـین همـایش انجمـن دیرینه‌شناسی ایـران ، سازمان حفاظت محیط زیست کـشور، تهران.

همتی، س.، عاشوری، ع.ر.، قادری، ع.، طاهر پور خلیل آباد، م.، 1394. روزن‌داران کف زی و جلبک‌های آهکی سازند تیرگان دربرش چینه‌شناسی طاهرآباد (خاور حوضه رسوبی کپه داغ). نهمین همایش انجمن دیرینه‌شناسی ایران، دانشگاه فردوسی مشهد. 150-145.

Bachmann, M., & Hirsch, F., 2006. Lower Cretaceous carbonate platform of the eastern Levant (Galilee and the Golan Heights): stratigraphy and second-order sea-level change. Cretaceous Research, 27: 487-512.

Bucur, I.I., 2011. Early Barremian dasycladalean algae from Serre de Bleyton (Drôme, SE France). Annalen des Naturhistorischen Museums in Wien, Serie A, 619-653.

Bucur, I.I., Majidifard, M.R., & Senowbari-Daryan, B., 2013. Early Cretaceous calcareous benthic microfossils from the eastern Alborz and western Kopet Dagh (northern Iran) and their stratigraphic significance. Acta Palaeont. Romaniae, 9 (1): 23-37.

Bucur, I.I., Rashidi, K., & Senowbari-Daryan, B., 2011. Early Cretaceous calcareous algae from central Iran (Taft Formation, south of Aliabad, near Yazd). Facies, 58 (4): 605-636.

Bucur, I.I., Sasaran, E., 2005. Relationship between algae and environment: an Early Cretaceous case study, Trascau Mountains, Romania. Facies, 51: 274–286

Carevic, I., Taherpour Khalil Abad, M., Ljubovic-Obradovic, D., Vaziri, S.H., Mirkovic, M., Aryaei, A.A., Stejic, P., & Ashouri, A.R., 2013. Comparis ons between the Urgonian platform carbo nates from eastern Serbia (Carpatho-Balk anides) and northeast Iran (Kopet-Dagh Basin): Depositional facies, microfacies, biost ratigraphy, palaeoenvironments and palae oecology. Cretaceous Research, 40: 110-130.

Granier, B., & Michaud, F., 1987. Deloffrella quercifoliipora n. gen. n. sp., une Algue Dasycladacee nouvelle du Kimmeridgien et du Portlandien du Sud-Est du Mexique. Bulletin de la Societe geologique de France, Paris, (8ème serie), III (6): 1089-1096.

Granier, B., 2013. Dissocladella hauteriviana MASSE in MASSE et al., 1999 (non MASSE, 1976), another lower Urgonian Dasycladalean alga revisited. Carnets de Geologie, Letter 2013/07 (CG2013-L07): 1-9.

Granier, B., Clavel, B., Charlloais, J., & Weidmann, M., 2014. Lastest Jurassic – Early Cretaceous Dasycladalean algae (Chlorophyta) from the Morand Drilling at Montricher (Canton of Vaud, Switzerland). Acta Palaeontologia Romaniae, 10 (1-2): 25-38.

Henson, F.R.S., 1948. Larger Imperforate Foraminifera of Southwestern Asia: Families Lituolidue, Orbitolinidae and Meandropsinidae. British Museum (Natural History), 127 p.

Hosseini, S.A., Conrad, M., 2008. Calcareous algae, foraminifera and sequence stratigraphy of the Fahliyan Formation at Kuh-e-Surmeh (Zagros Basin, SW of Iran). Geologia Croatica, 61 (2-3): 215-237.

Husinec, A., & Sokac, B., 2006. Early Cretaceous benthic associations (foraminifera and calcareous algae) of a shallow tropical-water platform environment (Mljet Island, southern Croatia). Cretaceous Research, 27: 418-441.

Husinec, A., Velić, I., Sokač, B., 2009, Diversity patterns in mid-Cretaceous benthic foraminifers and dasyclad algae of the southern part of Mesozoic Adriatic Platform, Croatia. In: Demchuk, J., & Gary, A., (eds.), Geologic Problem Solving with Microfossils, SEPM Special Publication 93: 153-170.

Ivanova, D., & Kolodziej, B., 2010. Late Jurassic-Early Cretaceous foraminifera from Stramberk-type limestones, Polish Outer Carpathians, Studia Universitatis Babeş-Bolyai, Geologia, 55 (2): 3 – 31

Kalantari, A., 1969. Foraminifera from the middle-Jurassic-Cretaceous successions of Kopet-Dagh region (N.E. IRAN). Tehran, NIOC. Geol.Laboratories, Publication. no.3, Ph.D. thesis, London University.

Loeblich, A.R., & Tapan, H., 1988. Foraminiferal Genera and Their Classification. Van Nostrand Reinhold Company: NewYork, pp. 66-336.

Parvaneh Nejad Shirazi, M., 2009. Green algae from the Lower Cretaceous carbonates of northern Shiraz (Zagros Mountains, SW Iran). Historical Biology, 21: 91–98.

Parvaneh Nejad Shirazi, M., Amiri Bakhtiar, H., Mostatabi, M., Armon, A., 2013. Lithostratigraphy and Biostratigraphy of Gadvan and Dariyan formations in Gachsaran Oilfield by Investigation of Wells Number 55 and 83. Journal of Basic and Applied Scientific Research, 3 (12): 56-63.

Rahaghi A., 1976, Contribution a l’etude de quelques Grands Foraminifers de 1’ Iran part, pt 1-3, N.I.O.C., Publication no: 6, p. 1-68.

Rami, M., Vaziri, M.R., Taherpour Khalil Abad, M., Hosseini, S.A., Carevic, I., Allameh, M., 2012. Microbiostratigraphy of the Lower Cretaceous strata from the Bararig Mountain, SE Iran. Revista Mexicana de ciencias Geologicas, 29 (1): 63-75.

Ruttner, A.W., 1993. Southern borderland of Triassic Laurasia in northeast Iran. Geol. Rund., 82: 110-120.

Schroeder, R., van Buchem, F.S.P., Cherchi, A., Baghbani, D., Vincent, B., Immenhauser, A., Granier, B., 2010. Revised orbitolinid biostratigraphic zonation for the Barremian –Aptian of the eastern Arabian Plate and implications for regional stratigraphic correlations. GeoArabia Special Publication 4 (1): 49-96.

Stampfli, G. M., Borel, G. D., Marchant, R. & Mosar, J. 2002. Western Alps geological constraints on western Tethyan reconstructions. In: Rosenbaum, G. and Lister, G. S. 2002. Reconstruction of the evolution of the Alpine-Himalayan Orogen. Journal of the Virtual Explorer, 8: 77 - 106.

Stampfli, G.M., & Borel, G.D., 2004. The TRANSMED transects in space and time: constraints on the paleotectonic evolution of the Mediterranean domain. In: Cavazza W., Roure F., Spakman W., Stampfli G.M., Ziegler P.A. (eds.), The TRANSMED Atlas: The Mediterranean region from crust to mantle. Springer Berlin Heidelberg, 53-80.

Taherpour Khalil Abad, M., Conrad, M.A., Aryaei, A.A. & Ashouri, A.R., 2010. Barremian-Aptian dasycladalean algae, new and revisited, from the Tirgan Formation in the Kopet Dagh, NE Iran. Carnets de Geologie, Art 2010/05 (CG2010-A05): 1-13.

Taherpour Khalil Abad, M., Schlagintweit, F., Vaziri, S.H., Aryaei, A.A., & Ashouri, A.R., 2013. Balkhania balkhanica Mamontova, 1966 (benthic foraminifera) and Kopetdagaria sphaericaMaslov, 1960 (dasycladalean alga) from the Lower Cretaceous Tirgan Formation of theKopet Dagh mountain range (NE Iran) and their paleobiogeographic significance. Facies, 59 (1): 267–285.

Taherpour Khalil-Abad, Aryaei, A.A., Ashouri, A.R., & Hosseini, A., 2010. Benthic foraminiferal assemblages in Tirgan formation (Urgonien facies type), West of Kopet-Dagh sedimentary basin, NE of Iran. The 1 st International Applied Geological Congress, Islamic Azad University-Mashad Branch, pp. 1027-1032.

Vanneau, A.A., Silva, I.P., 1995. Biostratigraphy and systematic description of benthic Foraminifers from mid-cretaceous shallow-water platfrom sediment at site 878 and 879 (Mit and Takuyo-Daisan Guyots). Proceedings of the Ocean Drilling Program, Scientific Results, 144: 1-21.

Wilmsen, M., Fürsich, F.T., & Majidifard, M.R., 2015. An overview of the Cretaceous stratigraphy and facies development of the Yazd Block, western Central Iran. Journal of Asian Earth Sciences, 102: 73–91.

Yadav, P.R. 2003. Fossils. Discovery Publishing House, p. 30.

Yazdi moghadam, A. Amiri, F., 2010. Lower Cretaceous Agglutinating Larger Benthic Foraminifera from the Sarvestan Section, south of Esfahan, Iran. The 1st International Applied Geological Congress, Islamic Azad University-Mashad Branch, pp. 976-980.