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Book chapter
English

Sedimentology of Organic Matter in Upper Tithonian-Berriasian Deep-Sea Carbonates of Southeast France: Evidence of Eustatic Control

Published inSource Rocks in a Sequence Stratigraphic Framework, Editors Katz, Barry J. & Pratt, Lisa M., p. 49-65
PublisherTulsa : The American Association of Petroleum Geologists
Collection
  • AAPG studies in geology; 37
Publication date1993
Abstract

A quantitative palynofacies study was performed on upper Tithonian-Berriasian, open-marine, fine-grained carbonates outcropping at Berrias (Berriasian stage stratotype), Broyon, and Angles in the Vocontian basin of southeast France. Organic constituents are subdivided into a relatively autochthonous marine fraction (mainly dinocysts and secondarily foraminiferal linings) and an allochthonous land-derived fraction (higher plant debris and sporomorphs). Fluorescent amorphous organic matter is absent throughout these organic-lean carbonates. Within a precise biostratigraphic framework based on ammonites and calpionellids, the three studied sections are interpreted in terms of sequence stratigraphy, using field observations, micro- and macrofacies analysis, and palynofacies data. Within this sequence stratigraphy framework, trends in the distribution of organic matter bear the imprint of sea level fluctuations. Moreover, a model of an idealized palynofacies sequence in open marine carbonates is proposed for each systems tract: - The lowstand systems tract (LST) is dominated by large-scale, angular, and/or degraded terrigenous fragments; - The transgressive systems tract (TST) is marked by the upward decrease in abundance, size, and angularity of terrigenous fragments, and by the upward increase in blade-shaped black humic fragments (approx. inertinite) and in dinocysts diversity and abundance, which peak at the maximum flooding surface (mfs); - The highstand systems tract (HST) shows reversed trends, both dinocysts and blade-shaped black humic fragments decreasing, and terrigenous fragments increasing. The outlined methodology has a definite application in petroleum geology. It can be used in different depositional environments, notably in more organic-rich sediments, where the potential presence of fluorescent amorphous organic matter, particularly abundant in transgressive episodes, provides an extra palynofacies parameter.

Funding
  • Swiss National Science Foundation - 20-30276.90
Citation (ISO format)
STEFFEN, Daniel, GORIN, Georges Edouard. Sedimentology of Organic Matter in Upper Tithonian-Berriasian Deep-Sea Carbonates of Southeast France: Evidence of Eustatic Control. In: Source Rocks in a Sequence Stratigraphic Framework. Tulsa : The American Association of Petroleum Geologists, 1993. p. 49–65. (AAPG studies in geology)
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Book chapter (Published version)
accessLevelRestricted
Identifiers
  • PID : unige:154352
ISBN0891810455
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