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Relation between graphitization of organic matter and clay mineralogy, Silurian black shales in Central Spain

Published online by Cambridge University Press:  05 July 2018

J. F. Barrenechea ,
M. Rodas  and
A. Arche
J. F. Barrenechea
Affiliation:
Departamento de Cristalografía y Mineralogía, Facultad de Geología, U.C.M., 28040 Madrid, Spain
M. Rodas
Affiliation:
Departamento de Cristalografía y Mineralogía, Facultad de Geología, U.C.M., 28040 Madrid, Spain
A. Arche
Affiliation:
Instituto de Geología Económica, C.S.I.C.-U.C.M., Facultad de Geología, 28040 Madrid, Spain
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Abstract

A horizon containing graphite in the Early Silurian slates of the Eastern Central System, Central Spain, has been studied. The carbonaceous slates contain quartz, muscovite, graphitized organic matter, plagioclase, pyrite and apatite; and the slates above the graphite horizon contain quartz, phengite, plagioclase and chlorite. The origin of the graphite is related to a period of very slow accumulation rate, anoxic seafloors deep-water upwellings and plankton blooms. The chlorite and graphite are mutually exclusive and by' using the chlori te AlIV content and the graphite Co parameter, the conditions of metamorphism were calculated to be 300 ± 20°C and 1.5-2 kbar.

Keywords

graphiteEarly SilurianSpanish Central Systemanchi-epimetamorphismchloriteillite crystallinity
Type
Research Article
Information
Mineralogical Magazine , Volume 56 , Issue 385 , December 1992 , pp. 477 - 485
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1992

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