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Paleoenvironmental changes at Col des Tribes (Montagne Noire, France), a reference section for the Famennian of north Gondwana-related areas

GIRARD C
•
CORNÃ E J-J
•
CORRADINI C
altro
FEIST R
2014
  • journal article

Periodico
GEOLOGICAL MAGAZINE
Abstract
We present detailed biostratigraphy based on conodonts and palaeoenvironmental trends deduced from microfacies and conodont abundance through the Famennian (Late Devonian) at Col des Tribes (Montagne Noire, France). The succession is characterized by micritic limestones deposited in settings oscillating between mid to outer ramp. Facies contain poor fauna, widely dominated by nektonic organisms. This section is complete and one of the most conodont-rich for the Famennian of the north Gondwana-related area. The Upper Kellwasser event (Frasnian-Famennian boundary) and the Hangenberg (Devonian-Carboniferous boundary) have been lithologically identified. They are characterized by decimetre-thick black dysoxic to anoxic argillaceous sediments. The Condroz and annulata events, although not materialized by lithological changes, have been positioned due to the precise stratigraphy. The first event occurred during the deposition of condensed ferruginous facies (griotte limestones) and the second event during the deposition of micrites barren of benthic fauna. The combination of information from both facies and conodont biofacies changes allows a general sea-level curve through the entire Famennian for north Gondwana to be proposed for the first time. At Col des Tribes, the general trend is a slight deepening upwards from triangularis to trachytera zones, then a pronounced shallowing-upwards trend from upper trachytera to praesulcata zones. This curve correlates with the well-known reference curve from Euramerica concerning the late Famennian (trachytera to praesulcata Zones). There are some discrepancies in minor cycles which can be explained by tectonical phenomena at the onset of the edification of the Variscan belt in Europe.
DOI
10.1017/S0016756813000927
WOS
WOS:000340589700007
Archivio
http://hdl.handle.net/11368/2950174
info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-84905567991
http://journals.cambridge.org/action/displayAbstract?fromPage=online&aid=9312511&fulltextType=RA&fileId=S0016756813000927
Diritti
metadata only access
Soggetti
  • conodont

  • microfacie

  • Devonian

  • Montagne Noire

  • sea level

Web of Science© citazioni
28
Data di acquisizione
Mar 19, 2024
Visualizzazioni
1
Data di acquisizione
Apr 19, 2024
Vedi dettagli
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