Geology Reference
In-Depth Information
Table 2. Major, trace element and isotope compositions of the G¨ney perched springline tufa deposits
14
C measurement
d
13
C
d
18
O
Sample no*
Si
Al
Fe
Mg
Ca
Ba
Sr
MgCO
3
Method
pMC
yr BP
(‰ PDB)
1
2150
580
980
1860
383500
97
236
0.80
B49
63.8 + 0.5
3610 + 60
29.13
28.44
D172
60.5 + 2.0
4030 + 270
2
9380
4230
2800
3120
341400
108
222
1.50
B56
64.1 + 0.6
3565 + 70
27.71
28.16
D193
68.5 + 2.0
3040 + 230
3
140
50
700
3180
379200
152
249
1.38
B51
65.7 + 0.5
3375 + 60
27.69
27.90
4
2000
890
840
3240
368000
125
230
1.45
B52
65.5 + 0.5
3395 + 60
27.85
28.10
D182
65.4 + 1.9
3415 + 230
5
930
420
490
2220
380900
143
225
0.96
B68
76.0 + 0.4
2200 + 45
26.25
28.14
6
1910
370
1050
5940
377300
136
237
2.56
B57
73.6 + 0.6
2463 + 70
26.00
27.40
D190
77.9 + 2.1
2010 + 220
7
1440
580
770
3300
378300
33
262
1.43
D228
68.0 + 2.1
3096 + 245
27.99
27.59
8
8770
2060
1680
7440
352200
183
285
3.40
D225
62.7 + 1.9
3748 + 249
28.36
28.11
9
190
160
770
1380
388900
192
322
0.59
B59
48.6 + 0.5
5790 + 80
27.69
28.12
D200
50.5 + 1.4
5490 + 220
10
6910
1790
1960
2220
375800
150
222
0.97
B61
65.0 + 0.6
3460 + 70
28.19
28.03
D202
67.0 + 1.6
3220 + 190
11
980
320
490
1680
381700
138
253
0.73
D248
67.9 + 1.8
3108 + 215
26.53
27.65
12
B55
70.6 + 0.6
2800 + 70
26.93
27.88
Average
3164
1041
1139
3235
373382
133
249
1.43
27.52
27.96
*The samples 1, 3, 4 and 12 are recent tufas. Elements are in ppm, MgCO
3
values (in mol%) were calculated from Mg and Ca data assuming these are the only cations in the carbonate fraction.
14
C activity was
determined with LSC method with 2 sample preparation procedures (B- benzene synthesis and D- CO
2
absorption method).
14
C results were expressed as
14
C activity in percent of modern carbon (pMC) and as
14
C age in yr BP (not corrected for the initial
14
C activity Ao).
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