Sedimentary environments and sequence stratigraphy of tidal deposits of the Fasham Formation, Mila Group, Central Alborze

Document Type : مقالات پژوهشی

Authors

• Aram Baitgol ¹
• Seyed Reza Mousavi Harami ²
• Asadollah Mahboubi ²

¹ Department of Earth Sciences, Institute for Advanced Studies in Basic Sciences (IASBS), Zanjan, Iran

² Professor, Department of Geology, Faculty of Science, Ferdowsi University of Mashhad

10.22067/sed.facies.v8i1.36599

Abstract

Four stratigraphic sections of the Middle Cambrian Fasham Formation sediments exposed in the Central Alborz are described and interpreted on the basis of field observations and facies analysis in order to reconstruct their depositional environments and sequence stratigraphic framework. Relying on the facies characteristics and stratal geometries, the size of the bedforms, the sedimentary structures and the complex arrangement, the erosional base, the predominantly sandy grain size, the significant height of the sandbodies together with the tidal action evidences such as extensive cross-stratified sandstone, tidal bundles, reactivation surfaces and mud drapes, the siliciclastic successions of the Fasham Formation are deposited in a tide-dominated open-mouthed estuarine environment. During the initial inundation of the present-day Alborz region in the early Middle Cambrian, siliciclastic deposits formed in open-mouthed estuarine. Basal sequence of Middle Cambrian sediments is composed of a transgressive systems tract (TST) comprising the basal siliciclastic-dominated succession of the Fasham Formation and a carbonate-dominated highstand systems tract (HST) with in the lower part of the Deh-Sufiyan Formation. It records the drowning of the terrigeneous sources and subsequent establishment of the carbonate system. Based on sequential infilling model for open estuaries during transgression and initial flooding, tidal flats were developed along the margins and sandy dunes formed along the central part of the estuary and their lower surface was interpreted as a subaerial unconformity formed due to lowstand erosion. The last stage of infilling involves the development of sand bars that gradually migrated towards the open sea until they wholly occupy the mouth of the open estuary.

Keywords

• Fasham Formation
• sedimentary environment
• Sequence stratigraphy
• Middle Cambrian
• estuarine
• initial flooding

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References

بایت گل. آ، 1393. ایکنولوژی و چینه نگاری سکانسی سازند میلا (البرز مرکزی) و مقایسه آن با سازند شیرگشت (طبس).

رساله دکتری، دانشگاه فردوسی مشهد. 501 ص.

Alavi, M., 1996. Tectonostratigraphic synthesis and structural style of the Alborz mountain system in northern Iran. Journal of Geodynamics, 21: 1–33.

Allen, G.P., & Posamentier, H.W., 1994. Transgressive facies and sequence architecture in mixed tide- and wave-dominated incised-valley: example from the Gironde Estuary, France. In: Dalrymple, R.W., Boyd, R., & Zaitlin, B.A., (eds.), Incised Valley Systems: Origin and Sedimentary Sequences. SEPM Special Publication, 51: 225 -240.

Bayet-Goll, A., Neto de Carvalho, C., Moussavi-Harami, R., Mahboubi, A., & Nasiri, Y., 2014a. Depositional environments and ichnology of the deep-marine succession of the Amiran Formation (upper Maastrichtian–Paleocene), Lurestan Province, Zagros Fold–Thrust Belt, Iran. Palaeogeography, Palaeoclimatology, Palaeoecology, 401: 13-42.

Bayet-Goll, A., Geyer, G., Wilmsen, M., Mahboubi, A., & Moussavi-Harami, R., 2014b. Facies architecture, depositional environments and stratigraphy of the Middle Cambrian Fasham and Deh-Sufiyan formations in the central Alborz, Iran. Facies, 60: 815-841.

Bayet-Goll, A., Chen, J., Moussavi-Harami, R., & Mahboubi, A., 2015. Depositional processes of ribbon carbonates in middle Cambrian of Iran (Deh-Sufiyan Formation, Central Alborz). Facies 61: 9. DOI:10.1007/s10347-015-0436-6.

Bayet-Goll, A., & Neto de Carvalho, C., 2015. Ichnology and sedimentology of a tide-influenced delta in the Ordovician from the Northeastern Alborz range of Iran (Kopet-Dagh region). Lethaia, 49, 327–350.

Catuneanu, O., 2006. Principles of Sequence Stratigraphy. Elsevier, Amsterdam, 375 p.

Cattaneo, A., & Steel, R., 2003. Transgressive deposits: a review of their variability. Earth Science Reviews, 1277: 1-43.

Dalrymple, R.W., Zaitlin, B.A., & Boyd, R., 1992. Estuarine facies models: conceptual basis and stratigraphic implications. Journal of Sedimentary Petrology, 62: 1130–1146.

Dalrymple, R.W., & Choi, K., 2007. Morphologic facies trends through the fluvial-marine transition in tide-dominated depositional systems: a schematic framework for environmental and sequence- stratigraphic interpretation. Earth Science Reviews, 8: 135–174.

Desjardins, P.R., Pratt, B.R., Buatois, L.A., & Mangano, M.G., 2010. Stratigraphy and sedimentary environments of the Lower Cambrian Gog Group in the southern Rocky Mountains of western Canada: evolution of transgressive sandstones on a broad continental margin. Bulletin of Canadian Petroleum Geology, 58: 1–37

Fedo, C.M., & Cooper, J.D., 1990. Braided fluvial to marine transition: the basal Lower Cambrian Wood Canyon Formation, Southern Marble Mountains, Mojave Desert, California. Journal of Sedimentary Petrology, 60: 220–234.

Geyer, G., Bayet-Goll, A., Wilmsen, M., Mahboubi, A., & Moussavi-Harami, R., 2014. Lithostratigraphic revision of the middle and upper Cambrian (Furongian) in northern and central Iran. Newsletters on Stratigraphy, 47: 21-59.

Haq, B.U., & Schutter, S.R., 2008. A chronology of Paleozoic sea-level changes. Science, 322: 64–68.

Harris, P.T., Heap, A.D., Bryce, S.M., Porter-Smith, R., Ryan, D.A., & Heggie, D.T., 2002. Classification of Australian clastic coastal depositional environments based upon a quantitative analysis of wave, tidal and river power. Journal of Sedimentary Research, 72: 858– 870.

Hein, F.J., 1987. Tidal/littoral of fshore shelf deposits–Lower Cambrian Gog Group, southern Rocky Mountains, Canada. Sedimentary Geology, 52: 155–182

Johnson, H.D., & Baldwin, C.T., 1996. Shallow clastic seas. In: Reading, H.G., (ed.), Sedimentary Environments: Processes, Facies and Stratigraphy. Blackwell Science, London, pp. 232–280.

Kwon, Y.K., Chough, S.K., Choi, D.K., & Lee, D.J., 2006. Sequence stratigraphy of the Taebaek Group (Cambrian-Ordovician), mideast Korea. Sedimentary Geology, 192: 19–55.

Landing, E., Geyer, G., & Heldmaier, W., 2006. Distinguishing eustatic and epeirogenic controls on Lower–Middle Cambrian boundary successions in West Gondwana (Morocco Iberia). Sedimentology, 53 (4): 899-918.

Legler, B., Johnso, H.D., Hampson, G.J., Massart, B.G., Jackson, C.L., Jackson, M.D., El-Barkooky, A., & RavNas, R., 2013. Facies model of a fine-grained, tide-dominated delta: Lower Dir Abu Lifa Member (Eocene), Western Desert, Egypt. Sedimentology, 60: 1313–1356.

MacEachern, J.A., & Gingras, M.K., 2007. Recognition of brackish-water trace fossil assemblages in the Cretaceous western interior seaway of Alberta. In: Bromley, R.G., Buatois, L.A., Mangano, M.G., Genise, J.F., & Melchor, R.N., (eds.), Sediment–Organism Interactions: A Multifaceted Ichnology. SEPM Special Publication, 88: 149–194.

Meng, X., Ge, M., & Tucker, M.E., 1997. Sequence stratigraphy, sea-level changes and depositional systems in the Cambro-Ordovician of the North China carbonate platform. Sedimentary Geology, 114: 189–222.

Nio, S.D., & Yang, C., 1991. Diagnostic attributes of clastic tidal deposits: a review. In: Smith, D.G., Reinson, G.E., Zatlin, B.A., & Rahmani, R.A., (eds.), Clastic Tidal Sedimentology. Canadian Society of Petroleum Geologists, Memoir, 16: 3–28.

Osleger, D., & Read, J.F., 1991. Relation of eustasy to stacking patterns of meter -scale carbonate cycles, Late Cambrian, U.S.A. Journal of Sedimentary Petrology, 61: 1225–1252.

Osleger, D.A., & Montañez, I.P., 1996. Cross-platform architecture of a sequence boundary in mixed siliciclastic-carbonate lithofacies, Middle Cambrian, southern Great Basin, U.S.A. Sedimentology 43: 197-217.

Peng, S., Geyer, G., & Hamdi, B., 1999. Trilobites from the Shahmirzad section, Alborz Mountains, Iran: Their taxonomy, biostratigraphy and bearing for international correlation. Beringeria, 25: 3–66.

Seilacher, A., 1991. An updated Cruziana stratigraphy of Gondwanan Palaeozoic sandstones. In: Salem, M.J., (ed.), The Geology of Libya 4, Elsevier, Amsterdam, pp. 1565–1581.

Seilacher, A., 2007. Trace Fossil Analysis. Springer Verlag, Berlin, Heidelberg, 226 p.

Sim, M.S., & Lee, Y., 2006. Sequence stratigraphy of the Middle Cambrian Daegi Formation (Korea), and its bearing on the regional stratigraphic correlation. Sedimentary Geology, 191: 151-169.

Simpson, E.L., & Eriksson Jr., K.A., 1991. Early Cambrian progradational and transgressive sedimentation patterns in Virginia: an example of the early history of a passive margin. Journal of Sedimentary Petrology, 60: 84–100.

Stöcklin, J., Ruttner, A., & Nabavi, M., 1964. New data on the Lower Paleozoic and pre-Cambrian of North Iran. Geology Survey Iran, Reprt no.1: 1-29.

Torsvik, T.H., & Cocks, L.R., 2013. Gondwana from top to base in space and time. Gondwana Research. 24 (3-4): 999-1030.

Willis, B.J., 2005. Deposits of tide-influenced river deltas. In: Giosanand, L., & Bhattacharya, J.P., (eds.), River Deltas: Concepts, Models and Examples. SEPM Special Publication, 83: 87-129.

Willis, B.J., & Gabel, S.L., 2003. Formation of deep incisions into tide-dominated river deltas: implications for the stratigraphy of the Sego Sandstone, Book Cliffs, Utah, U.S.A. Journal of Sedimentary Research, 73: 246–263.

Willis, B.J., Bhattacharya, J.P., Gabel, S.L., & White, C.D., 1999. Architecture of a tide-influenced river delta in the Frontier Formation of central Wyoming, USA. Sedimentology, 46: 667–688.

Wrona, R., & Hamdi, B., 2001. Palaeoscolecid sclerites from the Upper Cambrian Mila Formation of the Shahmirzad section, Alborz Mountains, northern Iran. Acta Geologica Polonica, 51: 101–107.

Zand-Moghadam, H., Moussavi-Harami, R., Mahboubi, A., & Bavi, H., 2013. Comparison of tidalites in siliciclastic, carbonate, mixed siliciclastic-carbonate systems: examples from Cambrian Devonian deposits of east-central Iran. ISRN Geology 2013, Article I 435761, p. 21.

Zaitlin, B.A., Dalrymple, R.W., & Boyd, R., 1994. The stratigraphic organization of incised valley systems associated with relative sea-level change. In: Dalrymple, R.W., Boyd, R., & Zaitlin, B.A., (eds.), Incised Valley Systems: Origin and Sedimentary Sequences. SEPM Special Publication, 51: 45-60.