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a
X
20
14
_
+
_
_
_
_
P2
_
B3
_
_
_
_
+
_
B2
+
+
+
_
+
+
+
8
_
+
_
P1
P
+
+
b
16
5 mm
o
*
16:1
B
18
14
o
o
o
20
o
o
o
o
Retention time
Fig. 11.4
Analysis of fossil fi sh scale from Las Hoyas, Spain (specimen LH-50.081). (
a
) Partial
ion chromatogram of Pyrolysis-GC-MS analysis of fi sh scale revealing the dominance of an ali-
phatic polymer (+:
n
-alkanes, −:
n
-alkenes) similar to Type I/II kerogen. (
b
) Partial ion chromato-
gram of TMAH-Pyrolysis-GC-MS analysis of fi sh scale revealing the distribution of fatty acyl
moieties (o).
Bn
: benzene derivative,
Pn
: Phenol derivative where n represents number of carbon
atoms in alkyl group. Number on top of peaks denote carbon chain length of the alkane/alkene
homologues or fatty acyl moieties.
X
: unknown C
19
hydrocarbon
254
100
211
171
128
105
170
172
143
141
129
55
183
155
169
115
95
91
239
255
0
100
150
200
250
m/z
Fig. 11.5
Mass spectra of unknown compound present in the fi sh scale pyrolysate. Analysis of the
ion series and isotopic abundances suggest a polyunsaturated hydrocarbon with an elemental com-
position C
19
H
26
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