Record of latest Barremian-Cenomanian environmental change in tectonically controlled depressions from the Jura-Burgundy threshold (Jura Mountains, eastern France and western Switzerland)
The area of the western Jura Mountains constitutes the former Jura-Burgundy threshold between the Tethys Ocean and the epicontinental Paris Basin Sea. During the Barremian, the area was covered by a shallow-water Urgonian carbonate platform. Tectonic processes influenced the architecture of the Urgo...
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| Published in: | Palaeogeography, palaeoclimatology, palaeoecology Vol. 514; pp. 627 - 654 |
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| Main Authors: | , , , , , |
| Format: | Journal Article |
| Language: | English |
| Published: |
Elsevier B.V
15-01-2019
Elsevier |
| Subjects: | |
| Online Access: | Get full text |
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| Summary: | The area of the western Jura Mountains constitutes the former Jura-Burgundy threshold between the Tethys Ocean and the epicontinental Paris Basin Sea. During the Barremian, the area was covered by a shallow-water Urgonian carbonate platform. Tectonic processes influenced the architecture of the Urgonian platform and were notably responsible for the formation of fault-related depressions on top of the Urgonian series, which were subsequently transformed into incised valleys and then to marine depocenters. Their sedimentary infills are mostly represented by the Perte-du-Rhône Formation and record stepwise environmental change on the innermost platform, which was strongly influenced by the nearby landmass. From the latest Barremian onward, sedimentation progressively changed from: i) predominantly oncoidal and detrital charophyte-rich marly limestones; to ii) heterozoan marly limestones and marls; followed by iii) detrital sediments interspersed with numerous phosphatic conglomerates. These changes are linked with the onset of the latest Barremian Taxy Episode and with the following oceanic anoxic episodes (OAE's) 1a to d in the neighbouring basins. The sedimentary changes are associated with sedimentary sequences which formed during 2nd-order transgressions, and which express the effect of sea level fall followed by drowning events. The presence of a rich ammonite-fauna allowed a precise biostratigraphical dating of these events during the latest Barremian to Cenomanian time interval.
•Precise documentation and age model for uppermost Barremian-Cenomanian platform series in the Jura Mountains•Episode of environmental change from the latest Barremian onwards linked to the onset of the Taxy Episode.•Since the late early Aptian, the Jura Domain was affected by a succession of drowning events and OAEs.•Stepwise changes of the depositional environments from oligotrophic to mesotrophic conditions•Carbonate platform progressively drowned and became covered by pelagic sediments. |
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| ISSN: | 0031-0182 1872-616X |
| DOI: | 10.1016/j.palaeo.2018.11.011 |