caa a22 4500 469045477 CHVBK 20180323132823.0 cr unu---uuuuu 170328e19921201xx s 000 0 eng 10.1007/BF02536807 doi (NATIONALLICENCE)springer-10.1007/BF02536807 Oligocene swamp sediments of Lesvos Island, Greece (geochemistry and mineralogy) [Elektronische Daten] [Akis Kelepertsis, Evangelos Velitzelos] Summary: The Tertiary Lapsarna swamp sedimentary rocks include thin horizons (organic-rich sediments, up to 22% Corg). Analyses of major elements of carbonates, shaly and siliceous rocks, and a thin, intensively silicified coaly horizon were taken (10 representative samples). Pure carbonates consistalmost completely of calcite, the siliceous sediments of quartz and calcite, and the shales of montmorillonite, feldspar, quartz, dolomite and calcite. The shales contain montmorillonite as the only clay component. The presence of montmorillonite in all shales suggests that the chemistry of the clay-forming solutions lies within the stability field of montmorillonite. Geochemical data indicate that montmorillonite and associated immobile elements (La, Zr, Y, Nb) are the products of hydrolysis of volcanic material in a subtropical region. The intense silification of the coaly horizon is due to a contact with silica-rich solutions that formed during the formation of montmorillonite. Quartz is produced diagenetically by transformation of amorphous opal-A after burial. Institut für Paläontologie, Universität Erlangen, 1992 Swamp Sediments nationallicence Carbonates nationallicence Shales nationallicence Coals nationallicence Silification nationallicence Geochemistry nationallicence Lesvos Island (Greece) nationallicence Tertiary (Oligocene) nationallicence Kelepertsis Akis Department of Geology, Section of Geochemistry and Economic Geology, Athens University, Panepistimiopolis, Ano Ilissia, 15784, Athens, Greece aut Velitzelos Evangelos Section of Paleontology and Stratigraphy, Athens University, Panepistimiopolis, Ano Ilissia, 15784, Athens, Greece aut Facies Springer-Verlag 27/1(1992-12-01), 113-118 0172-9179 27:1<113 1992 27 10347 https://doi.org/10.1007/BF02536807 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF02536807 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Kelepertsis Akis Department of Geology, Section of Geochemistry and Economic Geology, Athens University, Panepistimiopolis, Ano Ilissia, 15784, Athens, Greece aut NATIONALLICENCE 700 1- Velitzelos Evangelos Section of Paleontology and Stratigraphy, Athens University, Panepistimiopolis, Ano Ilissia, 15784, Athens, Greece aut NATIONALLICENCE 773 0- Facies Springer-Verlag 27/1(1992-12-01), 113-118 0172-9179 27:1<113 1992 27 10347 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer