The first palynological data of the Middle Jurassic deposits from borehole 16, Elektrougli (Moscow region, Russia)

• Autorzy: Rostovtseva J. I.
• Języki publikacji: EN

Abstrakty

EN

The palynological analysis of the Middle Jurassic deposits has been carried out for the borehole No. 16 and No. 5 located in Elektrougli west of Moscow region (Russia). Twenty samples have been macerated from clays of these two boreholes. Only one of them contained palynomorphs (spores and pollen) in sufficient amount. As a result the single palynological assemblage was established. Pollen grains are abundant (over 55% of the total of the assemblage). The grains of Alisporites similis (Balme) Dettmann, and A lowoodensis de Jersey dominates among the pollen reaching to 22% of the assemblage. It should be noted that a lot of different coniferous pollen grains from ancient deposits were found here, as such as: A. parvus de Jersey, A. robustus Nilsson and Pseudopinus textilis Bolchovitina. There were also the pollen grains of Cycadopites sp. (6%), and Sciadopityspollenites mesozoicus Couper (4%). A few pollen of Vitreisporites pallidus (Reissinger) Nilsson with affinity to Caytoniales, Perinopollenites elatoides Couper and Ephedripites sp. were rarely discovered. There are a lot of spores (45%) in the studied palynoassemblage. Spores of Filicopsida (12%) are represented by Dictyophyllidites harrisii Couper, Leiotriletes magna (de Jersey) Norris, Deltoidospora juncta (Kara-Murza) Singh with affinity to the genera Dicksonia, and Matoniasporites related to Matoniaceae. There are a few spores (10%) of Cyatheaceae (Cyathidites minor Couper). The spores of hydrophilic ferns are represented by Osmundacidites jurassicus Couper, Baculatisporites comaumensis (Cookson) Potonie, and Todisporites minor Couper. There are various lycopods (5%): Uvaesporites verrucosus (de Jersey) Helby in de Jersey, Densoisporites velatus Weyland & Krieger, Lycopodiumsporites clavatoides Couper; Lycopodiumsporites subrotundum (Kara-Murza) Pocock and moss spores of Polycingulatisporites crenulatus Playford & Dettmann (2%) which are typical for the Bajocian deposits. There are very common the tuberculous forms such as Leptolepidites sp. and Camptotriletes cerebramiformis Maljavkina. The acritarchs are represented by Leiosphaeridia sp. This assemblage can be compare with palynological assemblage of the Bajocian age from Denmark (Nielsen et al. 2010) by comparable quantity of Cyatheaceae and presence of Caytoniales pollen. Thus studied palynological assemblage has the Bajocian age documented by presence of Polycingulatisporites crenulatus, Alisporites similis, A. lowoodensis and also ancient forms of A. parvus, A. robustus, Uvaesporites verrucosus, Baculatisporites comaumensis which are typical for the Aalenian Age. The quantity of lycopods, moss and ferns of Osmundaceae indicates the lake-mire continental conditions of the studied region.

Słowa kluczowe

EN

pollen grains; palynomorphs

• Wydawca: Wydawnictwa AGH
• Czasopismo: Geology, Geophysics and Environment
• Rocznik: 2012
• Tom: Vol. 38, no. 4
• Strony: 523--524
• Opis fizyczny: Bibliogr. 1 poz.

Twórcy

autor

Rostovtseva J. I.

• Lomonosov Moscow State University, Geological Faculty, Department of Paleontology; Leninskie Gory, 119991, Moscow, Russia

Bibliografia

• 1. Nielsen L.H., Petersen H.I., Dybkjar K. & Surluk F., 2010. Lake-mire deposition, earthquakes and wildfires along a basin margin fault: Ronne Graben, Middle Jurassic, Denmark. Paleogeography, Palaeoclimatology, Palaeoecology, 292, 103-126.