A demonstration of an affinity between pyrite and organic matter in a hydrothermal setting |
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| Authors: | Paula Lindgren John Parnell Nils G Holm and Curt Broman |
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| Institution: | (1) Department of Geographical and Earth Sciences, University of Glasgow, Glasgow, G12 8QQ, UK;(2) Department of Geology and Petroleum Geology, University of Aberdeen, Aberdeen, AB24 3UE, UK;(3) Department of Geological Sciences, Stockholm University, 106 91 Stockholm, Sweden |
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| Abstract: | One of the key-principles of the iron-sulphur world theory is to bring organic molecules close enough to interact with each
other, using the surface of pyrite as a substrate in a hydrothermal setting. The present paper explores the relationship of
pyrite and organic matter in a hydrothermal setting from the geological record; in hydrothermal calcite veins from Carboniferous
limestones in central Ireland. Here, the organic matter is accumulated as coatings around, and through, pyrite grains. Most
of the pyrite grains are euhedral-subhedral crystals, ranging in size from ca 0.1-0.5 mm in diameter, and they are scattered
throughout the matrix of the vein calcite. The organic matter was deposited from a hydrothermal fluid at a temperature of
at least 200°C, and gives a Raman signature of disordered carbon. This study points to an example from a hydrothermal setting
in the geological record, demonstrating that pyrite can have a high potential for the concentration and accumulation of organic
materials. |
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