Organic matter characterisation of the Selli Level (Umbria-Marche Basin, central Italy)

Citation
F. Baudin et al., Organic matter characterisation of the Selli Level (Umbria-Marche Basin, central Italy), CRETAC RES, 19(6), 1998, pp. 701-714
Citations number
40
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Earth Sciences
Journal title
CRETACEOUS RESEARCH
ISSN journal
0195-6671 → ACNP
Volume
19
Issue
6
Year of publication
1998
Pages
701 - 714
Database
ISI
SICI code
0195-6671(199812)19:6<701:OMCOTS>2.0.ZU;2-I
Abstract
The Selli Level is a marker-bed in the Umbria-Marche Apennines that represe nts the regional sedimentary expression of the Lower Aptian Oceanic Anoxic Event la. This one to three-metre-thick interval shows a remarkable uniform ity on a regional scale, with a green to grey marry lower part overlain by black shales. Bulk geochemical studies and an examination of palynofacies w ere carried out on three sections in order to characterise the distribution and nature of the organic matter in the Selli Level which has been poorly known hitherto. The organic content is medium (0.5 to 2.9% TOC) in the basa l part and higher (4.5% on average, and up to 18% TOC) in the black shares. Pyrolysis and palynological data indicate that the organic matter is mainl y of marine origin. The geochemical characteristics of the Selli Level are compared to other, more or less organic-rich marker-beds in the Cretaceous succession of the Umbria-Marche Apennines. (C) 1998 Academic Press Limited.