بایواستراتیگرافی، رخساره‌ها و چینه نگاری سکانسی سازند کلات در غرب حوضه کپه داغ
محورهای موضوعی :
کلید واژه: بايواستراتيگرافي چینه نگاری سکانسی رخساره سازند کلات حوضه کپه داغ,
چکیده مقاله :
به‌منظور مطالعات بایواستراتیگرافی، تغییرات رخساره‌ای و چینه نگاری سکانسی سازند کلات در غرب حوضه کپه داغ دو برش چینه‌شناسی جوزک و چخماقلو انتخاب و نمونه‌برداری شده است. ضخامت سازند کلات در برش‌های چینه‌شناسی جوزک و چخماقلو به ترتیب 158 و 139 متر بوده و لیتولوژی آن به‌طور عمده از سنگ آهک‌های خاکستری تا قهوه‌ای رنگ و مقدار کمی مارن تشکیل شده است. در مطالعات بایواستراتیگرافی ضمن تشخیص 15 گونه متعلق به 32 جنس از فرامینیفرهای بنتیک و 6 گونه متعلق به 11 جنس از فرامینیفرهای پلانکتون، یک بایوزون تحت عنوانSiderolites calcitrapoides-Sirtina orbitoidiformis Assemblage Zone شناسائی و معرفی گردید. سن سازند کلات در هر دو برش بر اساس بایوزون فوق و فسیل‌های موجود در آن مائستریشتین تعیین شد. مطالعات پتروگرافي منجر به شناسائی 1 رخساره آواري و 10 رخساره کربناته متعلق به چهار محيط جزر و مدي، لاگون محصور و نيمه محصور، سدي و درياي باز گردید که بر روي يک رمپ کربناته با شيب کم ته‌نشست شده‌اند. براساس تغييرات عمودي رخساره‌ها و شناسائي محیط‌های رسوبي، دو سکانس رسوبي تشخيص داده شد. سکانس رسوبی 1 عمدتا از رخساره‌های ابتداي درياي باز و سدی تشکیل شده و حداکثر پيشروي سطح آب دريا در این سکانس توسط رخساره درياي باز حاوي اکينوئيد و فرامينيفر پلانکتوني مشخص می‌شود. سکانس رسوبی 2 عمدتا از رخساره‌های محيط سدي غني از بايوکلاست، اينتراکلاست، فرامينيفر بنتيک و روديست تشکیل شده و حداکثر پيشروي سطح آب دريا توسط رخساره بايوکلاست اکينوئيد پکستون مشخص می‌گردد. مقايسه روند تغييرات سطح آب دريا در منطقه مورد مطالعه با منحنی‌های تغييرات سطح آب جهاني و سطح آب صفحه عربي نشان می‌دهد رسوب‌گذاری سازند کلات به‌وضوح تحت تاثير تغييرات سطح آب جهاني بوده است.
In order to determine biostratigraphy, facies and sequence stratigraphy of the Kalat Formation in the West of Kopet Dagh Basin, two Jozak and Chakhmaghlu stratigraphic sections were selected and sampled. The thickness of the Kalat Formation in the Jozak and Chakhmaghlu stratigraphic sections are 158 and 139m respectively, and its lithology consists mainly of gray to brown limestones and few marl. Biostratigraphic studies led to recognition of 32 genera and 15 species of benthic foraminifera and 11 genera and 6 species of planktonic foraminifera and then, Siderolites calcitrapoides-Sirtina orbitoidiformis Assemblage Zone was identified. Based on the indicated biozone and fossil contents, the age of the Kalat Formation is Maestrichtian. Petrographic analysis led to recognition of one silliciclastic and ten carbonate facies belonging to four depositional environments including tidal flat, restricted and semi-restricted lagoon, shoal and open marine. The identified facies were deposited on a homoclinal ramp setting. On the basis of facies distribution and depositional environments, two depositional sequences were proposed for the Kalat Formation. Depositional sequence 1 consists mainly of proximal open marine and shoal facies. Maximum flooding surface of this sequence is characterized by open marine facies containing echinoid and planktonic foraminifera. Depositional sequence 2 consists mainly of shoal facies rich in bioclast, intraclast, benthic foraminifera and rudist. MFS of depositional sequence 2 is represented by bioclast echinoid packstone facies. Comparison between sea level changes in the study area with eustatic sea level and Arabian Plate sea level curves show that sedimentation of the Kalat Formation was influenced by eustatic sea level change.
افشار حرب، ع.، 1373. زمین‌شناسی کپه داغ، انتشارات زمین‌شناسی و اکتشافات معدني کشور، 606.
Afshar-Harb, A., Soheili, M., and Valeh, N., 1978. Kurkhud geological map 1/250000. Geological Survey of Iran, 13.
Afshar-Harb, A., 1994. Geology of the Iranian Kopet-Dagh. Geological Survey of Iran, Tehran, 265 (in Persian).
Berberian, M., and King, G.C.P., 1981. Towards a paleogeography and tectonic evolution of Iran. Canadian Journal of Earth Sciences, 18, 210-265.
Blair, T.C., 1987. Sedimentary processes, vertical stratification sequences, and geomorphology of the Roaring River alluvial fan, Rocky Mountain National Park, Colorado. Journal of Sedimentary Petrology, 57, 1–18.
Blair, T. C., and McPherson, J. G., 1994a. Alluvial fans and their natural distinction from rivers based on morphology, hydraulic processes, sedimentary processes, and facies. Journal of Sedimentary Research, 64, 451–490.
Burchette, T.P., and Wright, V.P., 1992. Carbonate ramp depositional systems. Sedimentary Geology, 79, 3-57.
Burchette, T. P., 1993. Mishrif Formation (Cenomanian-Turonian), Southern Arabian gulf, Carbonate platform growth along a cratonic basin margin. In: Simo, J. A. T., Scott, R. W., and Masse J-P., (eds.), Cretaceous carbonate platforms. American Association Petroleum Geologist Bulletin, 56, 185-200.
Carannanate, G., Ruberti, D., and Sirna, M., 2000. Upper Cretaceous low energy ramp limestones from the Sorrento Peninsula (southern Apennines, Italy): micro and macrofossil associations and their significance in the depositional sequences. Sedimentary Geology, 132, 89-124.
Caron, M., 1985. Cretaceous planktic foraminifera. In: Perch-Nielsen, K., Saunders, J.B. and Bolli, H.M., (eds.), Plankton Stratigraphy. Cambridge University Press, Cambridge, 17 – 86.
Dunham, R.J., 1962. Classification of carbonate rocks according to depositional texture. In: Ham, W.E. (Ed.), Classification of Carbonate Rocks. AAPG Memoir, 1, 108-121.
Embry, A.F.I., and Klovan, J.E., 1972. Absolute water depth limits of Late Devonian paleoecological zones. Geology Rundsch, 61, 672-686.
Emery, D., and Myers, K.J., 1996. Sequence Stratigraphy. Oxford, United Kingdom, Blackwell, 297.
Folk, R.L., 1974. Petrology of Sedimentary Rocks. Hamphill, Austin, Texas, 182.
Flugel, E., 2010. Microfacies of Carbonate Rocks, Analysis, Interpretation and Application. Springer, Berlin, 976.
Ginsburg, R. N., and Hardie, L. A., 1975. Tidal and storm deposits Northwest-ern Andros Island, Bahamas. In: Ginsburg, R.N., (ed.). Tidal Deposits, 23, 201–208.
Haq, B.U., Hardenbol, J., and Vail, P.R., 1987. Chronology of fluctuating sea level since the Triassic. Science, 235, 1156-1166.
Haq, B.U., and Al-Qahtani, A.M., 2005. Phanerozoic cycles of sea-level change on the Arabian Platform. GeoArabia, 10, 127-160.
Harris, M.K., Thayer, A.A., and Amidon, M.A., 1997. Sedimentology and depositional environments of Middle Eocene terrigenous-carbonate strata, southeastern Atlantic coastal plain. Sedimentary Geology, 108, 141-161.
Heckel, P.H., 1972. Recognition of ancient shallow marine environments. In: Rigby, J.K., and Hamblin, W.K. (eds.), Recognition of ancient sedimentary environments, SEPM Special Publication, 16, 226-286.
Hofker, J., 1957. Foraminiferen der Oberkreide von Nordwestdeutschland und Holland. Amt für Bodenforschung, Hannover, 464.
Kalantari, A., 1987. Biofacies Map of the Kopet-Dagh Region. National Iranian Oil Company, Exploration and Production Group, Tehran.
Loeblich, A. R., Jr. and Tappan, H., 1988. Foraminiferal Genera and their Classification. Van Nostrand Rienhold, New York, 970.
Lyberis, N., Manby, G., Poli, J.T., Kalugin, V., Yousouphocaev, H., and Ashirov, T., 1998. Post Triassic evolution of the southern margin of the Turan plate. Comptes Rendus Academic Sciences Paris, 326, 137–143.
Miller, K.G., Wright, J.D., and Browning, J.V., 2005. Visions of ice sheets in a greenhouse world. Marine Geology, 217, 215-231.
Mutti, M., and Simo, J.A., 1994. Distribution, petrography and geochemistry of dolomite in cyclic shelf facies, Yates formation (Guadalupian), Capitan Reef Complex, USA. International Association Sedimentologists Special Publications, 21, 91-107.
Postuma, J.A., 1971. Manual of Planktonic Foraminifera. Elsevier, Amsterdam, 420. Read, J., 1985. Carbonate platform facies models. AAPG Bulletin, 69, 1-21.
Robaszynski, F., and Caron, M., 1995. Foraminifères planctoniques du Crétacé: commentaire de la zonation Europe- Méditerranée. Bulletin Society Geology, France, 166, 681-692.
Robaszynski, F., Caron, M., Gonzales-Donoso, J.M., Wonders, A.A.H. and the European Working Group on Planktonic Foraminifera, 1984. Atlas of Late Cretaceous globotruncanids. Revista Micropaleontologia, 26, 145-305.
Scholle, P.A., and Arthur, M.A., 1980. Carbon isotope fluctuation in Cretaceous pelagic limestone: potential stratigraphic and petroleum exploration tool. AAPG Bulletin, 64, 67–87.
Scholle, P. A., and Scholle Dana, S. U., 2006. A Color Guide to the Petrography of Carbonate Rock: Grain, Texture, Porosity, Diagenesis. American Association Petroleum Geologist Bulletin, 549.
Sharland, P.R., archer, R., Casey, D.M., Davis, R.B., Hall, S.H., Heward, A.P., Horbury, A.D., and Simmons, M.D., 2001. Arabian Plate sequence stratigraphy, GeoArabia Special Publication 2, Gulf PetroLink, Bahrain, 371.
Shinn, G., 1983. Tidal flat environment. In: Scholle, P.A., Bebout, D.G., and Moore, C.H., (eds.), Carbonate Depositional Environments. AAPG Memoir, 33, 171-210.
Sliter, W.V., 1972. Upper Cretaceous planktonic foraminiferal zoogeography &ecology-eastern Pacific margin. Palaeogeography, Palaeoclimatology, Palaeoecology, 12, 15-31.
Simmons, M.D., Sharland, P.R., Casey, D.M., Davies, R.B., and Sutcliffe, O. E., 2007. Arabian Plate sequence Stratigraphy: Potential implication for global chronostratigraphy. Geo Arabia, 12, 101-130.
Smith, N. D., 1974. Sedimentology and bar formation in the upper Kicking Horse River, a braided outwash stream. Journal of Geology, 82, 205-223.
Smith, A. G., Smith, D. G., and Funnel, B. M., 1994. Atlas of Mesozoic and Cenozoic landmasses. Cambridge University Press, Cambridge, 99.
Stocklin, J., 1971. Stratigraphic Lexicon of Iran. Ministry of industry and mines. Geological Survey of Iran, Report Number 18.
Stocklin, J., 1974. Possible ancient continental margin in Iran. In: Burk, C.A., and Drake, C.L. (eds.), The Geology of Continental Margins. Springer, Berlin, Heidelberg, New York, 873–887.
Tomasovych, A., 2004. Microfacies and depositional environment of an Upper Triassic intra-platform carbonate basin: the Fatric Unit of West Carpathians (Slovakia). Facies, 50, 77–105.
Tucker, M.E., and Wright, P., 1990. Carbonate Sedimentology. Blackwell Scientific Publication, Oxford, 482.
Vail, P.R., Hardenbol, J., and Todd, R.G., 1984. Jurassic unconformities, chronostratigraphy and sea-level changes from seismic stratigraphy and biostratigraphy. In: Schlee, J.S., (eds), Interregional unconformities and hydrocarbon accumulation. AAPG Memoir, 36, 129-144.
Van Wagoner, J.C., Mitchum, R.M., Campion, K.M., and Rahmanian, V.D., 1990. Siliciclastic sequence stratigraphy in well log, cores, and outcrops: Concepts of high-resolution correlation of time and facies. American Association Petroleum Geologist Bulletin, 7, 1-55.
Warren, J., 2000. Dolomite: occurrence, evolution and economically important association. Earth Science Reviews, 52, 1-81.
Wilson, J.L., 1975. Carbonate Facies in Geologic History. Springer-Verlag, Berlin, 471.
Wilson, M. E. J., and Evans, M. E. J., 2002. Sedimentology and diagenesis of Tertiary carbonates on the Mangkalihat Penninsula, Boreneo: implications for subsurface reservoir quality. Marine and Petroleum Geology, 19, 873-900.
Wonders, A. A., 1980. Middle and late Cretaceous planktonic Foraminifera of the western Mediterranean area. Utrecht Micropaleontology Bulletin, 24, 1-158.
Zhicheng, Z., Willems, H., and Binggao, Z., 1997. Marine Cretaceous-Paleogene biofacies and ichnofacies in southern Tibet, China, and their sedimentary significance. Marine Micropaleontology, 32, 3-29.