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Het OWA, het open archief van het Waterbouwkundig Laboratorium heeft tot doel alle vrij toegankelijke onderzoeksresultaten van dit instituut in digitale vorm aan te bieden. Op die manier wil het de zichtbaarheid, verspreiding en gebruik van deze onderzoeksresultaten, alsook de wetenschappelijke communicatie maximaal bevorderen.

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one publication added to basket [239924]

Paleoclimatic and paleoenvironmental records of the Oligocene-Miocene transition, central Jylland, Denmark Sliwinska, K.K.; Dybkjær, K.; Schoon, P.L.; Beyer, C.; King, C.; Schouten, S.; Nielsen, O.B. (2014). Paleoclimatic and paleoenvironmental records of the Oligocene-Miocene transition, central Jylland, Denmark. Mar. Geol. 350: 1-15. dx.doi.org/10.1016/j.margeo.2013.12.014 In: Marine Geology. Elsevier: Amsterdam. ISSN 0025-3227; e-ISSN 1872-6151, meer

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Trefwoord

Foraminifera [WoRMS]

Author keywords

GDGT proxies; dinocysts; foraminifera; magnetostratigraphy;Oligocene/Miocene boundary; Mi-1 cooling event; delta C-13

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Auteurs		Top
Sliwinska, K.K. Dybkjær, K. Schoon, P.L., meer Beyer, C.	King, C. Schouten, S., meer Nielsen, O.B.

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Abstract

A multidisciplinary study of the Oligocene/Miocene (O/M) transition was carried in two boreholes (Harre-1 and Horn-1) from the Danish land area in order to improve the understanding of the paleodimatological and environmental changes across the Mi-1, the earliest Miocene cooling event. Dinoflagellate cyst (dinocyst) biostratigraphy, supported by re-evaluation of the foraminiferid biostratigraphy, a new set of magnetic data and stable carbon isotope (delta C-13) records were applied to improve the age model for the studied succession; as well as the positioning of the O/M boundary. These data further enabled a correlation of the two investigated profiles with the well-established stratigraphical framework for the Danish area. The BIT index (an organic proxy indicating the relative input of soil-derived organic matter), dinocyst assemblages and palynofacies have been applied for establishing the paleoenvironmental changes across the Oligocene/Miocene (O/M) boundary. Our data indicate a shallowing upward trend in the latest Oligocene, resulting in the establishment of a very restricted marine setting in the earliest Miocene. Our study confirms that the O/M boundary is located at a sequence boundary (the local sequence boundary B - SB B) and corresponds to an increase in terrestrial organic matter input. A mean air temperature record based on the MBT'/CBT proxy reveals an similar to 2 degrees C drop in temperature at the O/M and the sequence boundary. Our findings confirm previous suggestions that this sequence boundary is a result of the glacio-eustatic sea level fall related with the Mi-1 cooling event The unconformity at the sequence boundary probably correlates with the coldest part of Mi-1, and thus no deposits from this period have been preserved. This suggests that the temperature drop might have been greater than 2 degrees C.

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