Geology Reference
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a
Quercus robur, After extraction
L1
m/z 83+85
2 5
L3
C 16 FA
22
L5
I
L4
P1
L6
L2
Ps
P
Ps
Ep
Ps
L7
C 16 FA
C 14 FA
L8
P s
C 18 FA
Retention time
b
Quercus robur, After hydrolysis (saponification)
L1
m/z 83+85
Ps
L3 L4
L6
P2
B2
L7
Ps
P1
L2
Ps
L5
Ps
L 8
Retention time
Fig. 3.7 Partial total ion current chromatogram of modern Quercusrobur after extraction ( a ) and
after base hydrolysis ( b ) Ps : Polysaccharide products, B2 : Ethyl benzene, P : Phenol, P1 : Methyl
Phenol, P2 : Dimethyl Phenol, Ep : 4-ethenyl phenol, I : Indole, FA : Fatty acid, Cn : carbon chain
length. Lignin pyrolysis products: L1 : 2-methoxyphenol, L2 : 4-methyl-2-methoxyphenol,
L3 : 4-ethenyl-2-methoxyphenol, L4 : 2,6-Dimethoxyphenol, L5 : 3-allyl-6-methoxyphenol, L6 :
4-ethyl- 2,6-dimethoxyphenol, L7 : 4-ethenyl-2,6-dimethoxyphenol, L8 : 4-propenyl-2,6-dimethoxy
phenol.
n -alkane/ n - alk-1-ene homologoues series, number indicating carbon chain length.
Inset, m/z 85 + 83 mass chomatogram reveals the distribution of the alkane/alkene homologues
Chemistry of the Diatomite
The total organic carbon content of the Ardèche diatomite is low for a lacustrine
setting (about 1.84) and it is unlikely that kerogen or other matrix organic matter
could have contributed to the fossil leaves. . To confi rm this, we performed pyrolysis
and TMAH-pyrolysis on solvent extracted and non-treated matrix material. However,
even samples that had not been extracted failed to generate detectable pyrolysis
products during analysis. For detailed discussion on the effect of matrix on fossils,
see Chap. 4 for effect of sediment on organic contamination in fossils.
 
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