Abstract:The interglacial deposits in the South Lithuanian Snaigupėlė outcrop and borehole Snaigupėlė-705 are marked for different bedding conditions though the sections are in proximity of each other. In the borehole section, the interglacial deposits are thicker and bedding at a greater depth than the analogous deposits of the outcrop. In the Snaigupėlė outcrop, the highest compatibility of isochronic-correction dates, calculated using L/L (method of leaching) and TSD (method of total sample dissolution) models, was determined for combination of three samples. With the help of the f value (section of isochrones in the axis of ordinates), the contribution of the primary pollution with thorium was determined where, as based on corrected analytical data, isochronic-correction dating was performed:
Sed i men tary en vi ron ment changes dur ing the Early-Mid dleTwo sec tions (Daumantai-1 and Daumantai-3) in East Lith u a nia ex pose Early-Mid dle Pleis to cene lac us trine-al lu vial, de posits which lie on a thin Neo gene layer and on older De vo nian rocks. They are over lain by glacigenic de pos its. Geo chem i cal, palaeomagnetic, mag netic sus cep ti bil ity, plant macrofossil, and di a tom in ves ti ga tions were per formed to de ter mine the changes in the sed i men tary en vi ron ment. Clus ter anal y sis of the geo chem i cal vari ables (10 ma jor el e ments, 16 trace el ements, to tal or ganic and in or ganic car bon) re vealed the el e ment groups and fac tors. The low er most units are char ac ter ized by a ma jor in flu ence of lo cal ma te rial and sig nif i cant fluc tu a tions in heavy min eral con tent. These fluc tu a tions might re flect short-term cli mate changes. The tran si tional units have more ex pressed trends, es pe cially as re gards the trace el e ments and Zr/Ti. The up per most units are char ac ter ized by a slight in flu ence of lo cal ma te rial and small fluc tu a tions in trace el ements. The data ana lysed en able the sub di vi sion of the sec tion into units re lated to changes in sed i men tary en vi ron ment. The bound ary of the Bruhnes/Matuyama re ver sal in the Daumantai-1 and Dauma ntai-3 sec tions was de tected by palaeomagnetic stud ies and en ables the strati graphi cal cor re la tion of these de pos its.Key words: Early-Mid dle Pleis to cene, en vi ron men tal changes, geo chem is try, mag netic sus cep ti bil ity, plant macroremains, Lith u a nia.
1 In sti tute of Ge ol ogy and Ge og ra phy, Na ture Re search Cen tre, T. Ševčenkos 13, 03-223, Vilnius, Lith u a nia Baltrñnas V., ZinkutÅ R., ŠeirienÅ V., Karmaza B., Katinas V., KisielienÅ D., StakÅnienÅ R. and PukelytÅ V. (2014) The ear liest Pleis to cene interglacials in Lith u a nia in the con text of global en vi ron men tal change. Geo log i cal Quar terly, 58 (1): 145-162, doi: 10.7306/gq.1148 In ves ti ga tions have been car ried out in or der to re con struct the palaeoenvironmental changes dur ing the ear li est Pleis tocene interglacials and to es tab lish their re la tion to global en vi ron men tal changes. Three sec tions in east Lith u a nia ex pos ing the ear li est Pleis to cene lac us trine de pos its ly ing be tween the Kalviai (Gla cial B, Nidanian?) and Dzñkija (Sanian 1) and between Dzñkija (Sanian 1) and Dainava (Sanian 2) gla cial de pos its were se lected for study. Un til now the lavÅ-2 and Vindûiñnai-136 suc ces sions were con sid ered to have formed dur ing the Vindûiñnai (Augustovian?, Malopolanian) Inter glacial and the KudrÅ-915 suc ces sion dur ing the Turgeliai (Cromerian IV, Ferdynandovian) Inter gla cial. Geo chem i cal, palaeomagnetic, mag netic sus cep ti bil ity, ani so tropy of mag netic sus cep ti bil ity and palaeobotanical prox ies were ap plied to es tab lish the cyclicity and dy nam ics of palaeoenvironmental change. The data ob tained en able the sub di vi sion of the sec tion into units re lated to changes in the sed i men tary en vi ron ment. The Matuyama/Brunhes bound ary and Jaramillo subchron of the Matuyama chron have been rec og nized in the lavÅ sec tion. The re sults en able cor rec tion of the strati graphic po si tion of the sec tions stud ied. The sed i men ta tion in the lavÅ sec tion took place dur ing the Early Pleis to cene, while that at the Vindûiñnai-136 and KudrÅ-915 took place dur ing two dif fer ent Mid dle Pleis to cene interglacials.Key words: en vi ron men tal changes, geo chem is try, mag netic sus cep ti bil ity, palaeobotany, Early-Mid dle Pleis to cene, Lithu a nia.
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