Geoscience Reference
In-Depth Information
Table 6.1
IR-OSL results and radioactivity data for inter-till sand samples from boreholes along
the Klaipeda Strait
Laboratory
code
Borehole
no.
Sample
no.
IR-OSL age
(ka)
No.
U (ppm) Th (ppm) K (%)
D
e
(Gy)
1.
RLQG
1667-065
35257
2
0.31
0.23
0.87
44.7
25.9
±
2.5
2.
RLQG
1669-065
35257
3
0.23
0.33
0.55
123.7
91.4
±
8.8
3.
RLQG
1670-065
35257
4
0.08
0.63
0.65
139.1
99.8
±
7.4
4.
RLQG
1786-028
36856
1
0.03
1.50
0.74
126.0
81.6
±
5.2
5.
RLQG
1787-038
36856
2
0.08
0.51
0.58
114.3
84.2
±
5.3
6.
RLQG
1788-038
36856
3
0.01
1.08
0.69
118.5
82.2
±
5.2
7.
RLQG
1789-038
36856
4
0.49
2.12
1.15
231.0
112.1
±
7.3
8.
RLQG
1790-038
36856
5
0.31
1.21
1.14
229.5
114.3
±
7.4
9.
RLQG
1791-038
36856
6
0.33
2.24
0.96
214.5
113.1
±
7.3
10. RLQG
1792-038
36888
1
0.00
0.48
0.66
109.5
76.5
±
4.9
11. RLQG
1793-038
36888
6
0.15
1.42
0.71
129.0
82.6
±
5.3
86.4
±
5.5
12. RLQG
1794-038
36888
10
0.01
0.87
0.72
128.3
13. RLQG
1784-028
36897
1
0.30
1.72
0.85
169.1
97.5
±
6.2
14. RLQG
1785-028
36897
4
0.37
1.13
0.68
154.4
100.7
±
6.3
15. RLQG
1783-028
36897
6
0.24
1.23
0.67
161.4
107.3
±
6.7
Notes
: U, Th and K content in sediments are determined from laboratory gamma-ray spectrometry;
water content corrections, calculated cosmic ray contribution and internal feldspar dose rate were
taken into account on calculation of the IR-OSL ages.
6.5 Discussion
One of the main problems of Quaternary geology in the vicinities of the Klaipeda
Strait and in the whole Lithuanian Coastal Area is the reliable stratigraphic subdivi-
sion and correlation of sediments. The problem is that there are no reliable criteria
for stratigraphic correlation, especially for glacial sediments (tills). The colour of
tills is very changeable and cannot serve as a correlative. According to the experi-
ence of large-scale geological mapping of Quaternary sediments in the Lithuanian
Coastal Area, other indicators, such as the petrographic composition of gravel part
