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- Title
Palaeo-Nemunas delta history during the Holocene time.
- Authors
Gelumbauskaitė, Leonora #x017D;ivilė
- Abstract
A study is focused on the Palaeo--Nemunas delta morphogenesis and development during Late Glacial and Holocene time span. Geomorphometry and morphological features of the submerged delta were recognized for the first time on the submarine Curonian (Kuršių Plateau in 1986-1992. This paper presents a pilot study applied in 2006-2008 and is based on multi-beam echo sounder and side-scan sonar images data. Two geological sections across the Palaeo--Nemunas delta are compiled from the data of core studies. Geo-morphologic, sedimentological, biostratigraphical and radiocarbon AMS14C and IR-OSL analyses suggest that Palaeo-Nemunas'delta begun to develop in the palaeotopography of this area during Preboreal time and ended at the second half of Boreal. The basal residual level of the Ancylus (A2) regression phase was identified in the delta trunks at a depth of 41.3-39.9 m and dated 9.31-8.87 ka BP (8300-8000 14C kyr BP). This residual layer is overlapped by marine depositional Litorina (L1-2-3)--Post-Litorina complexes up 2 m thick and supported by 7.40&plusm0.5 ka BP; 6.80±0.5 ka BP (IR-OSL, RLQG 1881-118, 1882-118); 6.87±45 ka BP (6030±2514C kyr BP); 4.66±110 ka BP (4100±25 14C kyr BP, UGAMS #03138, 03139).
- Subjects
BALTIC Sea; GEOMORPHOLOGY; DELTAS; EROSION; HOLOCENE paleogeography
- Publication
Baltica, 2010, Vol 23, Issue 2, p109
- ISSN
0067-3064
- Publication type
Article