Details
| Original language | English |
|---|---|
| Article number | 105469 |
| Journal | Marine and Petroleum Geology |
| Volume | 136 |
| Issue number | 4 |
| Early online date | 30 Nov 2021 |
| Publication status | Published - Feb 2022 |
| Externally published | Yes |
Abstract
Standard sequence stratigraphy interpretations are commonly built upon the premise of fairly constant sediment supply, leaving vast uncertainties about sequence architecture and sea-level change recorded during major paleoenvironmental disturbances, usually associated with carbonate productivity collapse and increased siliciclastic sediments supply. During relative sea-level rise, this process is referred to as drowning event. However, drastic collapse of carbonate productivity during relative sea-level drop remains poorly documented. The Pliensbachian/Toarcian boundary in Morocco provides an outstanding example of such a case, referred here to as poisoning event. Using bio-, chemo- and high-resolution sequence stratigraphic approaches on horizontal seismic-scale outcrop data, we characterize the architecture of vertically and laterally mixed siliciclastic/carbonate systems. During poisoning event, the standard sequence Lowstand-Transgressive-Highstand system tracts is altered into Highstand-Transgressive-Falling Stage system tracts with little or no evidence for Highstand deposits. Noteworthy, it is important to note that poisoning and drowning events can be confused together in sedimentary records where the shoreline trajectory cannot be clearly tracked, as it has often been the case in previous Pliensbachian/Toarcian studies. The outcome of this study calls thus for a closer re-examination of other carbonate factory collapse event attributed to drowning events without an unambiguous knowledge of their coeval shoreline trajectory.
Keywords
- Carbonate factory collapse, Early Jurassic, Poisoning event, Sea-level fall, Sequence Stratigraphy
ASJC Scopus subject areas
- Earth and Planetary Sciences(all)
- Oceanography
- Earth and Planetary Sciences(all)
- Geophysics
- Earth and Planetary Sciences(all)
- Geology
- Earth and Planetary Sciences(all)
- Economic Geology
- Earth and Planetary Sciences(all)
- Stratigraphy
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In: Marine and Petroleum Geology, Vol. 136, No. 4, 105469, 02.2022.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - The effects of strong sediment-supply variability on the sequence stratigraphic architecture: Insights from early Toarcian carbonate factory collapses
AU - Krencker, Francois-Nicolas
AU - Fantasia, Alicia
AU - El Ouali, Mohamed
AU - Kabiri, Lahcen
AU - Bodin, Stéphane
N1 - Funding information: This research was financed by the Deutsche Forschungsgemeinschaft (DFG, project n° BO 3655/1-1), Bochum University, Germany and the Aarhus Universitets Forskningsfond (grant n° AUFF-E-2015-FLS-8-77 ), Aarhus University , Denmark, both granted to Stéphane Bodin. We are grateful to Editor Massimo Zecchin and Octavian Catuneanuk and an anonymous reviewer for their constructive comments and suggestions on this manuscript.
PY - 2022/2
Y1 - 2022/2
N2 - Standard sequence stratigraphy interpretations are commonly built upon the premise of fairly constant sediment supply, leaving vast uncertainties about sequence architecture and sea-level change recorded during major paleoenvironmental disturbances, usually associated with carbonate productivity collapse and increased siliciclastic sediments supply. During relative sea-level rise, this process is referred to as drowning event. However, drastic collapse of carbonate productivity during relative sea-level drop remains poorly documented. The Pliensbachian/Toarcian boundary in Morocco provides an outstanding example of such a case, referred here to as poisoning event. Using bio-, chemo- and high-resolution sequence stratigraphic approaches on horizontal seismic-scale outcrop data, we characterize the architecture of vertically and laterally mixed siliciclastic/carbonate systems. During poisoning event, the standard sequence Lowstand-Transgressive-Highstand system tracts is altered into Highstand-Transgressive-Falling Stage system tracts with little or no evidence for Highstand deposits. Noteworthy, it is important to note that poisoning and drowning events can be confused together in sedimentary records where the shoreline trajectory cannot be clearly tracked, as it has often been the case in previous Pliensbachian/Toarcian studies. The outcome of this study calls thus for a closer re-examination of other carbonate factory collapse event attributed to drowning events without an unambiguous knowledge of their coeval shoreline trajectory.
AB - Standard sequence stratigraphy interpretations are commonly built upon the premise of fairly constant sediment supply, leaving vast uncertainties about sequence architecture and sea-level change recorded during major paleoenvironmental disturbances, usually associated with carbonate productivity collapse and increased siliciclastic sediments supply. During relative sea-level rise, this process is referred to as drowning event. However, drastic collapse of carbonate productivity during relative sea-level drop remains poorly documented. The Pliensbachian/Toarcian boundary in Morocco provides an outstanding example of such a case, referred here to as poisoning event. Using bio-, chemo- and high-resolution sequence stratigraphic approaches on horizontal seismic-scale outcrop data, we characterize the architecture of vertically and laterally mixed siliciclastic/carbonate systems. During poisoning event, the standard sequence Lowstand-Transgressive-Highstand system tracts is altered into Highstand-Transgressive-Falling Stage system tracts with little or no evidence for Highstand deposits. Noteworthy, it is important to note that poisoning and drowning events can be confused together in sedimentary records where the shoreline trajectory cannot be clearly tracked, as it has often been the case in previous Pliensbachian/Toarcian studies. The outcome of this study calls thus for a closer re-examination of other carbonate factory collapse event attributed to drowning events without an unambiguous knowledge of their coeval shoreline trajectory.
KW - Carbonate factory collapse
KW - Early Jurassic
KW - Poisoning event
KW - Sea-level fall
KW - Sequence Stratigraphy
UR - http://www.scopus.com/inward/record.url?scp=85120440467&partnerID=8YFLogxK
U2 - 10.1016/j.marpetgeo.2021.105469
DO - 10.1016/j.marpetgeo.2021.105469
M3 - Article
VL - 136
JO - Marine and Petroleum Geology
JF - Marine and Petroleum Geology
SN - 0264-8172
IS - 4
M1 - 105469
ER -