Electron microscopy and pyrolysis of kerogens from the Kimmeridge Clay Formation, UK; source organisms, preservation processes, and origin of microcycles

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doi: 10.1016/0016-7037(95)00273-3
Authors:Boussafir, M.; Gelin, F.; Lallier-Verges, E.; Derenne, S.; Bertrand, P.; Largeau, C.
Author Affiliations:Primary:
Université d'Orléans, Dépt. des Sciences de la Terre, Orleans, France
Ecole Nationale Supérieure de Chimie de Paris, France
Volume Title:Geochimica et Cosmochimica Acta
Source:Geochimica et Cosmochimica Acta, 59(18), p.3731-3747. Publisher: Pergamon, Oxford, International. ISSN: 0016-7037
Publication Date:1995
Note:In English. 64 refs.; illus., incl. 3 tables
Summary:Short-term cyclic variations (microcycles) in total organic C (TOC) and hydrogen index (HI) are reported in the Kimmeridge Clay formation (Upper Jurassic). Three different types of 'amorphous' organic matter (AOM) account for >><[dollar]I> 80% of total kerogen. Orange AOM is amorphous; brown AOM is mainly composed of ultralaminae, and black AOM consists of minute ligneous debris in an amorphous matrix. Bituminite corresponds with the orange AOM. The orange AOM originated from S incorporation into lipids, whereas the brown AOM is derived from the selective preservation of algaenan-composed thin outer walls of microalgae. The black AOM includes altered lignins and selectively preserved bacterans. Large changes in the relative abundance of these three types of AOM along a 30 000 yr microcycle in the formation are discussed. [R.K.H.]
Subjects:Amorphous materials; Carbon; Cycles; Genesis; Jurassic; Kerogen; Kimmeridge Clay; Mesozoic; Organic carbon; Organic compounds; Preservation; Pyrolysis; Source rocks; TEM data; Upper Jurassic; Dorset England; England; Europe; Great Britain; United Kingdom; Western Europe; Hydrogen index; Microcycles; Organic materials
Abstract Numbers:96M/3324
Record ID:1995070895
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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