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THE ORGANIC GEOCHEMISTRY OF HYDROCARBON GASES IN FLUORITES FROM NORTHERN ENGLAND
Author(s) -
Ferguson J.
Publication year - 1991
Publication title -
journal of petroleum geology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.725
H-Index - 42
eISSN - 1747-5457
pISSN - 0141-6421
DOI - 10.1111/j.1747-5457.1991.tb00364.x
Subject(s) - fluorite , geology , mineralization (soil science) , hydrocarbon , fluid inclusions , geochemistry , mineralogy , chemistry , soil science , hydrothermal circulation , seismology , soil water , organic chemistry
A study of the light hydrocarbon gases which occur in saline, fluid inclusions in fluorite, from the Alston Block area of the Northern Pennine Orefield (NPO). is reported. Reproducibility of the data is demonstrated by comparing the analysis of samples collected on two separate occasions. Although it has not proved possible to use the technique to differtntiate zones in individual crystals. it has been shown that there is a good correlation between the amount of gas and the nature of the mineral. Thus. massive fluorite contains roughly twice the total amount of gas as single crystals. The bolance of saturated to unsaturated gases is shown to be dependent on the temperature of emplacement of the mineral. A comparison of this data with data obtained earlier from minerals, from the Askrigg Block and Derbvshire Dome has confirmed these findings. The relationship between these saline. fluid inelusions. and those filled with oil from Derbyshire and ehewhere. has led to speculation on the nature nnd timing of the fluids responsible for mineralization.