EFFECT OF IGNEOUS INTRUSION ON THE ORGANIC GEOCHEMISTRY OF A SILTSTONE AND AN OIL-SHALE HORIZON IN THE MIDLAND VALLEY OF SCOTLAND

被引:78
作者
GEORGE, SC
机构
[1] Newcastle Research Group, University of Newcastle upon Tyne, Newcastle upon Tyne, NE1 7RU, Drummond Building
关键词
SCOTLAND; IGNEOUS INTRUSION; SILTSTONE; OIL SHALE; THERMAL MATURATION; GC MS; AROMATIC HYDROCARBONS;
D O I
10.1016/0146-6380(92)90097-H
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
The effect of rapid thermal stress on the organic geochemistry of a siltstone intruded by a quartz-dolerite dyke and an oil shale intruded by an alkali-dolerite sill has been studied using optical petrography, Rock-Eval pyrolysis, gas chromatography and gas chromatography-mass spectrometry. Maturity-dependent ratios derived from both the aliphatic and aromatic hydrocarbon fractions corroborate the observation of Raymond and Murchison (1988b) that the alkali-dolerite sills, which were intruded soon after sedimentation, had a lesser effect than the later quartz-dolerite intrusions. The maturity parameters based on the alkylnaphthalene and alkylphenanthrene isomer ratios are more suitable for studying maturity variations in heat-affected samples than those based on the commonly-used aliphatic biological markers. These aromatic compounds survive to higher ranks and the isomer ratios continue changing.
引用
收藏
页码:705 / 723
页数:19
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