Lietuvos mokslų akademijos Leidybos skyrius
    Tel. +370 5 2626851, +370 5 2613620 El. paštas leidyba@lma.lt
Geografija / Geography

ISSN 1392-1096


2008 m. Nr. 2

Pagrindinės nuogulų sedimentacijos fazės ir jų amžius Nidzicos slėnyje (Pietų Lenkija)
Anna MICHNO

Michno A. Age and main phases of accumulation of sediments in Nidzica valley bottom (Southern Poland). Geografija. 2008. T. 44. Nr. 2. ISSN 1392-1096.
Polish loess areas belong to a belt that stretches from the French Atlantic coast to the Central European uplands, to the Urals. The loess covers consist of stratigraphically varied layers with a dominance of the Vistulian stratum. The object of this study is to understand ages and main phases of sediment accumulation in the Nidzica valley bottom. Paleogeographic interpretation of this sediments was adopted as the main method for the understanding of the Holocene development of the Nidzica valley. A detailed investigation was carried along a 19-km long mouth reach of the Nidzica valley, a left-hand side tributary of the Vistula valley, running through the Małopolska Upland. Fieldwork and detailed laboratory data were analysed in order to characterise the sediments. A total of 30 boreholes were drilled, ranging along six valley bottom transects. Altogether, 385 samples of mineral and mineral-organic sediments were taken for laboratory analyses. The sediments were tested for granularity, calcium carbonate content and organic content. Four principal lithological series were identified based on the sediments found along the six valley transects: sandy-gravelly; fine-grained carbonate; mineral and organic; and mineral overbank deposits.
Based on the interpretation of the valley bottom sediments, the mouth reach of the Nidzica valley can be broken down into four main stages: late Vistulian; early Holocene and Mid-Holocene; late Atlantic and early Subboreal, and finally the Subatlantic period. Late Holocene sediment analysis suggests a diachronism of floodplain sediment build-up both during the Subboreal and the Subatlantic periods.

Raktažodžiai: sediments, loess, sediment analysis, Nidzica valley

Numeriai:

2011 - T.47
Nr.1, Nr.2

2010 - T.46
Nr.1-2

2009 - T.45
Nr.1, Nr.2

2008 - T.44
Nr.1, Nr.2

2007 - T.43
Nr.1, Nr.2

2006 - T.42
Nr.1, Nr.2

2005 - T.41
Nr.1, Nr.2

2004 - T.40
Nr.1, Nr.2

2003 - T.39
Nr.1, Nr.2

2002 - T.38
Nr.1, Nr.2

2001 - T.37
Nr.1, Nr.2