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Paleoenviroment of the Dalichai Formation in Darjazin section, North of Semnan based on palynomorphs and Microfacies

Document Type : Original Research Paper

Authors

1 M.Sc., Department of Geology, School of Earth Sciences, Damghan University, Damghan, Iran

2 Assistant Professor, Department of Geology, School of Earth Sciences, Damghan University, Damghan, Iran

Abstract

The Dalichai Formation in Darjazin section in NE Semnan with a thickness of 631 meters consisting of an alternation of bulish-gray was studied. This formation overlies the Shemshak formation disconformity with conglomerate bed and it has gradually been covered by the thick-beded limestones of the Lar formation. In order to study paleoenviroment of the Dalichai Formation the authors examined many different factors including Microfacies and palynological data (abundance and diversity of Dinocyst, proximate to chorat Dinocyst, palynofacies analysis and "selective preservation of organic matter"). A high percentage of brown wood and sporomorphs and the dominance of cavate and proximate dinocysts such as Nannoceratopsis gracilis, and pareodinia ceratophora and fluorescent amorphous organic matter, as well as Miliolid benthic foraminifera are evidence of suboxic to anoxic condition, which favored accumulation and preservation of organic matter in open marine lagoon, in the lower part of Dalichai Formation. A decrease in the brown wood and abundance and species richness of marine palynomorph (mainly chorate dinocysts) reflects more offshore settings in the upper part of Dalichai Formation. On the other hand, Appearance and increase of planktonic foraminifera and Radiolar and posidonia indicate development of strong marine transgression and deposition in an open marine environment.

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References
 
Batten, D. J. and Stead, D. T., 2005- Palynofacies analysis and its stratigraphic application. In:  Koutsoukos, E.A.M. (Ed.); Applied Stratigraphy. Springer, Dordrecht. 203–226.
Batten, D. J., 1996- Upper Jurassic and Cretaceous miospores. Chapter 26A, Palynofacies and palaeoenvironmental interpretation. In: Jansonius, J. and McGregor, D.C. (eds.): Palynology: Principles and Application, American Association Stratigraphic Palynologists Foundation, 3: 1011-1064.
Dunhum, R. J., 1962- Classification of carbonate rocks according to depositional texture. In: Ham, W.E. (ed.), Classification of carb.
Fensome, R. A., 1979- Dinoflagellate cysts and acritarchs from the Middle and Upper Jurassic of Jameson Land, East Greenland, Bulletin GrønlandsGeologiskeUndersøgelse 132, 98 pp.
Flugel, E., 2004- Microfacies of Carbonate Rocks. springer, 976 p.
Gorin, G. E. and Steffen, D., 1991- Organic facies as a tool for recording eustatic variation in marine fine-grained carbonates-example of the BerriasianStratotype at Barrias(Ardecch,SE France). Paleo III, 85, 303-320. (Available on http://dx.doi.org/10.1016/0031-0182(91)90164-m).
Poulsen, N. E. and Riding, J. B., 2003- The Jurassic dinoflagellate cyst zonation of Subboreal Northwest Europe. In: Ineson, J.R. and Surlyk, F. (eds). The Jurassic of Denmark and Greenland. Geological Survey of Denmark and Greenland Bulletin, 1: 115-144. (Available on http://Citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.513.7916&rep=rep1&type=pdf).
Riding, J. B. and Thomas, J. E. 1992- Dinoflagellate cysts of the Jurassic System. In: Powell, A.J. (ed), A stratigraphic index of dinoflagellate cysts. British Micropalaeontological Society Publications Series. Chapman and Hall, London: 7-97.(Available on http://www.researchgate.net/profile/James_Riding/publication/289990451_Dinoflagellate_cysts_of_the_Jurassic_system/links/58a558f9a6fdcc0e07648a12/dinoflagellate-cyctc-of-the-jurassic-system.pdf?origin=publication_detail).
Riding, J. B., 1984- Dinoflagellate cyst range-top biostratigraphy of the uppermost Triassic to lowermost Cretaceous of northwest Europe. Palynology 8, 195–210.
Sarjent, W. A. S., 1978- Fossil and living dinoflagellates, Academic press London and New York, 182 p.
Sluijs, A., Pross, J. and Brinkhuis, H., 2005- From greenhouse to icehouse; organic-walleddinoflagellate cysts as paleoenvironmental indicators in the Paleogene. Earth-Science Reviews. 68: 281-315.
Tyson, R.V., 1993- Palynofacies analysis, In: D. G Jenkins (ed.), Applied Micropaleontology and Palynology", 135-172.
Tyson, R.V., 1995- Sedimentary Organic Matter. Organic Facies and Palynofacies; Chapman and Hall, London, 615 pp. 175pp. (Available on http://doi.org/10.1016/0146-6380(95)90073-x).
Van Der Zwan, C. J., 1990- Palynostratigraphy and palynofacies reconstruction of the Upper Jurassic to Lowermost Cretaceous of the Dra field, offshore Mid Norway. Review of Palaeobotany and Palynology, 62: 157 - 186. (Available on http:// www.sciencedirect.com/science/article/pii/003466679090021a).
Wantland, K. F. and Pursey, W. C., 1975- Distribution of Holocene benthic foraminifera on the Belize Shelf. American Association of Petroleum Geologists Studies in Geology, No. 2, p. 233-399.
Waveren, I. and Visscher, H., 1994- Analysis of the composition and selective preservation of organic matter in surficial deep-sea sediment form a high-productivity area (Banda Sea, Indonesia). Palaeogeography, Palaeoclimatology, Palaeocology, 112: 85-111. (Available on http:// www.sciencedirect.com/science/article/pii/ 0031-0182(94)90135-x).
Zonneveld, K., Versteegh, G. and Lange, G., 1997- Preservation of organic –walled dinoflagellate cyst in different oxygen regimes: a 1000 year natural experiment. Marine micropaleontology 29, 393 -405. (Available on http://www.sciencedirect.com/science/article/pii/s037783989600321?via%dihub).
 
Scientific Quarterly Journal of Geosciences
Volume 30, Issue 117
Volume 30, Issue 3, Serial Number 117, Autumn 2020
December 2020
Pages 287-294
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