Identyfikatory
Warianty tytułu
Upper Ordovician-Lower Silurian fine-grained sediments in the Podlasie-Lublin Basin
Języki publikacji
Abstrakty
In western and central parts of the Podlasie-Lublin Basin, Upper Ordovician-Lower Silurian mixed siliciclastic-carbonate section is dominated by fine-grained sediments (claystones, mudstones), which are passing into more carbonaceous ones towards the east. In this region, subsidence was controlled by flexural bending of the East European Craton margin. Sedimentological analysis of drill cores revealed that deposition of those fine-grained sediments originated from suspension and traction currents. Amount of oxygen plays important role in the rock record (Fig. 1) whereas occurrence of pyrite is significant for determinations of sedimentary conditionsion, also in terms of sea level changes (Fig. 2). The rocks display abundant sedimentological structures such as current ripples, wave ripples, hummocky cross-stratification (HCS), graded beds, water escape structures, soft sediment deformation and scours (Fig. 3). The rocks are also characterized by predominance of wave ripples, common scours, graded beds and soft sediment deformations whereas current ripples, water escape structures and HCS are rather rare. The most frequent of the ichnofacies elements include unlined, rarely branched Planolites, which represent Scolithos, Cruziana and Zoophycus ichnofacies. The size of elements of Planolites ichnofacies appears dependent on environmental conditions and ranges from 0.5 mm to 15 mm. Chondrites, Anconichnus, Helminthopsis and Teichichnus, very important environment indicators, are present but not that common (Fig. 4). Textural analyses along with the records of diagenetic features made it possible to distinguish a succession of stratigraphic parasequences (Fig. 5). Early carbonate cementation appeared important, especially in the case of suble or invisible changes in grain size. On the basis of the obtained results, depositional environment of fined-grained sediments in the Podlasie-Lublin Basin was interpreted as a wave-dominated shelf with turbidite episodes. Detailed sedimentological observations are crucial for definiting facies types and prediction of their distribution, but also for tracing the most organic-rich units in the sedimentological profile, as the basic in terms of gas shale prospects. Apparently monotonous fine-grained sediments (claystones and mudstones) are shown to be in fact miscellaneous.
Czasopismo
Rocznik
Tom
Strony
259--262
Opis fizyczny
Bibliogr. 7 poz., rys.
Twórcy
autor
- Państwowy Instytut Geologiczny- Państwowy Instytut Badawczy, ul. Rakowiecka 4, 00-975 Warszawa, pawel.lis@pgi.gov.pl
Bibliografia
- BOHACS K., GRABOWSKI G., CARROLL A., MANKIEWICZ P., MISKELL-GERHARDT K., SCHWALBACH J., WEGNER M. & SIMO J. 2005 - Production, destruction, and dilution - the many patos to source-rock development. SEPM Sp. Publ., 82: 61-101.
- LAZAUSKIENE J., SLIAUPA S., BRAZAUSKAS A. & MUSTEIKIS P. 2003 - Sequence stratigraphy of the Balic Silurian succession: tectonic control on the foreland infill [In:] McCann T. & Saintot A. (eds.) Tracing Tectonic Deformation Rusing the Sedimentary Record. Geol. Soc. London, Sp. Publ., 208: 95-115.
- MACQUAKER J. & BOHACS K. 2007 - On the Accumulation of Mud. Science, 318:1734-1735.
- MODLIŃSKI Z., PODHALAŃSKA T., SZYMAŃSKI B. (w przygotowaniu) - Atlas map paleomiąższościowo-litofacjalnych i paleogeologicznych. Państw. Inst. Geol., Warszawa.
- O'BRIEN N.R. & SLATT R.M. 1990 - Argillaceous Rock Atlas. Springer, Berlin-Heidelberg-New York.
- POTTER P.E., MAYNARD J.B., DEPETRIS P.J. 2005 - Mud & Mudstones: Introduction and Overview. Springer, Berlin-Heidelberg.
- SCHIEBER J., SAUTHARD J., THAISEN K. 2007 - Accertion of Mudstone Beds from Migrating Floccule Ripples. Science, 318: 1760-1763.
Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-article-BUS6-0022-0146
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