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Earth Science Frontiers, Vol. 17, Special Issue, Aug. 2010 ISSN 1005-2321 Microphytoplankton and Facies of Lower and Middle Jurassic of Siberia 282 A.A. Goryacheva Laboratory of paleontology and stratigraphy Mesozoic and Cenozoic, Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch of Russian Academy of Sciences, Novosibirsk 630090, Russia (E-mail: GoryachevaAA@ipgg.nsc.ru) During the last decades the multi-proxy palynological analysis became very useful not only in biostratigraphy, but also for the facies and paleosetting reconstructions. Facies analysis is especially important for the investigation of Siberian Jurassic sediments of great oil and gaz potential. Paleoecological interpret- tations of phytoplankton are based on the comparison (if possible) with modern microphytoplanktons and on the analysis of combined lithological, geochemical and paleontological data. Quantitative analysis of phytoplankton associations as well as ratio marine/continental palynomorphs through the section allows to recognize transgressive-regressive trends and to recon- struct sea-level fluctuations. Here we present our quantitative palynological results and facies analysis from a several of Siberian lower-middle Jurassic sections (boreholes Middle- Nakyn 360 and Yigyatto-Tung-1, eastern Siberia; borehole Tulai-Kiryaka 1, eastern region of Taymyr Peninsular; borehole Lul-Yach 5P, West-Tymskaya 1 and North-Pravdinskaya 521, central West Siberia; borehole Vostok 4 and Zolotoi Kitat outcrops, South- East of western Siberia;). On the base of taxonomic composition and quantitative fluctuations in phytoplankton assemblages, 9 associations have been re- cognized in studied sections. Thus, palynological results from Eastern Siberia (borehole Middle-Nakyn 360) suggest a most complete facies transition reflecting the transgression trend during Upper Sinemurian-Toarcian. Our data from the borehole Yigatto-Tung 1 (presence of dinocysts, prasinophytes, green algae and colonial green algae) specify on the shallow marine conditions with gradual transition to coastal fresh water settings characterized this region during Sinemurian-Pliensbachian (Gorya- cheva, 2005, 2006). Facial analysis of borehole Tulai- Kiryaka 1 shows gradual change of from transgression (Pliensbachian-Toarcian) to regression (Aalenian- Bathonian) of conditions (Goryacheva, 2009b). Palyno- logical data from central West Siberia (borehole Lul- Yach 5P) indicate an abrupt transition from continental to marine conditions during Upper Bathonian-Lower Callovian (Goryacheva, 2005b). In the borehole West-Tymskaya 1 and North- Pravdinskaya 521 are revealed acritarchs (Micrhystri- dium sp.), prasinophytes (Tasmanites sp.), green algae (Schisosporis sp., Ovoidites sp.) and colonial green algae (Botryococcus sp.), that probably notes on coastal-sea conditions in the Lower Toarcian of central West Siberia (Goryacheva, 2008). In the borehole Vostok 4 is saltish-water conditions have been certain (Upper Pliensbachian-Bajocian) with transgression in the Lower Toarcian (greatest quantity of dinocysts in the section) (Goryacheva, 2009). Palynological results from south-eastern West Siberia (Zolotoi Kitat outcrops) suggest a condition from fresh water to shallow marine (Goryacheva, 2006b). Obtained new data are very important for paleo- geograhpic reconstruction of West and East Siberian in the Jurassic time. Key words: Jurassic; Stratigraphy; Palynology; Facies; Siberia References: Goryacheva A.A. Palynostratigraphy of the Lower Jurassic deposits in the basin of river Vilyui (The eastern Siberia). In: Scientific Materials of XI All-Russia Palynological Conference “Palynology: Theory & Applications”. Moscow: Publishing house PINRAS, , 2005: 57-58 (in Russia). Goryacheva A.A. Palynological characteristic of boundary sediments of Tyumen and Vasyugan Formations in the section of borehole Lul-Yach 5P (center of western Siberia). In: Scientific Materials of First All-Russian Conference “Jura- ssic System of Russia: Problems of Stratigraphy and Paleogeography”. Moscow: Publishing house GINRAS, 2005b: 49-51 (in Russia). Goryacheva A.A. Palynostratigraphy of the Lower Jurassic deposits of eastern Siberia. In: Abstracts of 7th European Palaeobotany: Palynology Con- ference. Prague, 2006: 50 (on English in Czech Republic). Goryacheva A.A. Palynostratigraphy of Middle Jurassic deposits in sections of the Zolotoi Kitat river basin (South-East of West Siberia). In: Journal “Russian Geology and Geophysics”: News of Paleontology and Stratigraphy. Novosibirsk: SB RAS. 2006b, 47(8): 125-137 (in Russia with English abstract). Goryacheva A.A. Palynological characteristic of Toar- cian sediment in sections of borehole West- Tymskaya 1 and North-Pravdinskaya 521 (West Siberia). In: Journal “Russian Geology and Geophysics”: News of Paleontology and Strati-
Earth Science Frontiers, Vol. 17, Special Issue, Aug. 2010 ISSN 1005-2321 graphy. Novosibirsk: SB RAS, 2008, 49: 10-11, 205-211 (in Russia with English abstract). Goryacheva A.A. Palynostratigraphy of the Lower and Middle Jurassic sediments in the section of borehole Vostok 4 (South-East of western Siberia). In: Scientific Materials of the Third All-Russia Conference “Jurassic System of Russia: Problems of Stratigraphy and Paleogeography”. Saratov: The Publishing Center Science, 2009: 43-45 (in Russia). Goryacheva A.A. Palynostratigraphy of the Lower and Middle Jurassic sediments in the section of borehole Tulai-Kiryaka 1 (eastern region of Taymyr Peninsular). In: Abstracts of All-Russia Con- ference “200 years of Russian Paleontology”. Moscow: Publishing House MSU, 2009b: 29 (in Russia). 283
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