Lake Pavin History, geology, biogeochemistry, and sedimentology of a deep meromictic maar lake

394

7000 6000 5000 4000 3000 2000 1000 0

5000 4000 3000 2000 1000 0 1000 2000

cal BC - AD

cal BP

4500 3500 2500 1500 500 500 1500

20

10

5

0

15

%

700

100

200

400

(^600) mg HC/g TOC
60
0
20
40
x10
³ counts/sec
0
30
10
20
20
0
10
15
5
25
(SI)
0
0.01
0.02
0.03
0.04
0.05
d445
300
500
600
0
200
400
0
0.5
1
2
1.5
x10
6 counts/sec
0.1
0
0.02
0.04
0.06
0.08
d525
Fe
Fe/Mn
Ti
b
Si/Ti
TOC
HI
Fig. 23.8 Evolution through the last 7000 years of organic and mineral
sedimentation in PAV12, as documented by geochemical proxies (Ti;
Fe/Mn; Fe; Si/Ti curves form XRF core scanning), organic matter geo-
chemistry (Hydrogen Index, HI and Total Organic Carbon, TOC) and
spectrophotometric data (fi rst derivative d445 and d525 and b
parameter)
L. Chassiot et al.