Počet záznamů: 1
Cementation and blackening of Holocene sands by peat-derived humates: A case study from the Great Dune of Pilat, Landes des Gascogne, Southwestern France
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SYSNO ASEP 0425586 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Cementation and blackening of Holocene sands by peat-derived humates: A case study from the Great Dune of Pilat, Landes des Gascogne, Southwestern France Tvůrce(i) Suchý, V. (CZ)
Sýkorová, Ivana (USMH-B) RID, ORCID
Havelcová, Martina (USMH-B) RID, ORCID
Machovič, Vladimír (USMH-B)
Zeman, Antonín (UTAM-F) RID, SAI
Trejtnarová, Hana (USMH-B)Zdroj.dok. International Journal of Coal Geology. - : Elsevier - ISSN 0166-5162
Roč. 114, JUL (2013), s. 19-32Poč.str. 14 s. Forma vydání Tištěná - P Jazyk dok. eng - angličtina Země vyd. NL - Nizozemsko Klíč. slova humate ; peat ; cementation ; aeolian sand Vědní obor RIV DB - Geologie a mineralogie CEP GA205/09/1162 GA ČR - Grantová agentura ČR GA13-18482S GA ČR - Grantová agentura ČR Institucionální podpora USMH-B - RVO:67985891 ; UTAM-F - RVO:68378297 UT WOS 000320497000002 EID SCOPUS 84877323170 DOI 10.1016/j.coal.2013.03.012 Anotace The base sand layers of the aeolian Great Dune of Pilat, which stretches along the coast of Arcachon Bay, have been locally impregnated with a dark brown to black amorphous organic substance of humate composition. The humate-cemented sand forms a well-indurated horizon 40-50 cm in thickness that developed immediately beneath the Holocene peaty layer (P1 "paleosoil"). The humate, identified by means of FT-IR and Raman micro-spectroscopy, acted both as a cementing agent and as a coloring agent; it formed thin coats and meniscus cements between individual sandstone grains which, in turn, caused the dark, asphaltic-like appearance of the sandstone. Field observations, combined with geochemical analyses, and the presence of identical geochemical compounds recognized in the peat and sandstone humate cement, suggest that the peat-containing low-coalified (R-r = 0.2%) fragments of higher, submerged and floating plants and marine algae deposited in a saline and reducing environment served as an obvious source rock for the humate. The humate derived from decaying organic remains that descended from the peat into the permeable sand, where it indurated irreversibly over a period shorter than 3500 years. Pracoviště Ústav struktury a mechaniky hornin Kontakt Iva Švihálková, svihalkova@irsm.cas.cz, Tel.: 266 009 216 Rok sběru 2014
Počet záznamů: 1