High-resolution integrated magnetobiostratigraphy of a new middle Eocene section from the Neotethys (Elazığ Basin, eastern Turkey)

2017 ◽  
Vol 130 (1-2) ◽  
pp. 193-207 ◽  
Author(s):  
D. Rodelli ◽  
L. Jovane ◽  
E. Özcan ◽  
M. Giorgioni ◽  
R. Coccioni ◽  
...  
Keyword(s):  
High Resolution ◽  
Middle Eocene ◽  
Eastern Turkey

scholarly journals Origin and propagation of sedimentary sequences throughout the Escanilla fluvial routing system (South Pyrenean foreland basin)

2020 ◽  
Author(s):  
Luis Valero ◽  
Elisabet Beamud ◽  
Miguel Garcés ◽  
Andreu Vinyoles ◽  
Nikhil Sharma ◽  
...  
Keyword(s):  
High Resolution ◽  
Middle Eocene ◽  
Relative Weight ◽  
Foreland Basin ◽  
Distribution Patterns ◽  
Signal Propagation ◽  
Middle Part ◽  
Sedimentary Sequences ◽  
Source To Sink

<p>During middle Eocene, the Escanilla fluvial system transported and deposited material from East to West in the southern Pyrenees foreland basin. The paleogeography and sedimentology of the source to sink system is well established. The temporal framework is made of scattered low resolution magnetostratigraphies, and a robust temporal framework in the most distal (Olson) and most proximal (Sis) parts of the system. We built a new high resolution magnetostratigraphy from the middle part of the system, the Lascuarre section. The correlation of Lascuarre with the high resolution magnetostratigraphies and the integration of these data with other available chronological constraints results into a robust complete temporal framework from source to sink.</p><p>Sedimentological analyses of the Lascuarre section allow recognizing a set of sedimentary sequences throughout the record. Here we present the result of the analyses, and discuss the relative weight of the different forcing. Particularly, we elucidate the role of tectonics in relation to subsidence distribution patterns, and also the distinct expression of climate. Eventually, we identify and explore the signal propagation mechanisms of climate aberrations and of quasi-regular orbital variations along the routing system.</p>

A HIGH-RESOLUTION BENTHIC STABLE ISOTOPE RECORD OF THE MIDDLE EOCENE CLIMATIC OPTIMUM FROM THE NEWFOUNDLAND DRIFTS

2016 ◽  
Author(s):  
Donald Penman ◽  
◽  
Richard D. Norris ◽  
Steve Bohaty ◽  
Maximilan Vahlenkamp ◽  
...  
Keyword(s):  
High Resolution ◽  
Stable Isotope ◽  
Middle Eocene ◽  
Isotope Record ◽  
Climatic Optimum ◽  
Stable Isotope Record

scholarly journals Orbitally tuned timescale and astronomical forcing in the middle Eocene to early Oligocene

2014 ◽  
Vol 10 (3) ◽  
pp. 955-973 ◽  
Author(s):  
T. Westerhold ◽  
U. Röhl ◽  
H. Pälike ◽  
R. Wilkens ◽  
P. A. Wilson ◽  
...  
Keyword(s):  
High Resolution ◽  
Middle Eocene ◽  
Late Eocene ◽  
Magnetic Polarity ◽  
Driving Mechanisms ◽  
Early Oligocene ◽  
Composite Section ◽  
Age Model ◽  
Absolute Age ◽  
Geomagnetic Polarity

Abstract. Deciphering the driving mechanisms of Earth system processes, including the climate dynamics expressed as paleoceanographic events, requires a complete, continuous, and high-resolution stratigraphy that is very accurately dated. In this study, a robust astronomically calibrated age model was constructed for the middle Eocene to early Oligocene interval (31–43 Ma) in order to permit more detailed study of the exceptional climatic events that occurred during this time, including the middle Eocene climate optimum and the Eocene–Oligocene transition. A goal of this effort is to accurately date the middle Eocene to early Oligocene composite section cored during the Pacific Equatorial Age Transect (PEAT, IODP Exp. 320/321). The stratigraphic framework for the new timescale is based on the identification of the stable long eccentricity cycle in published and new high-resolution records encompassing bulk and benthic stable isotope, calibrated XRF core scanning, and magnetostratigraphic data from ODP Sites 171B-1052, 189-1172, 199-1218, and 207-1260 as well as IODP Sites 320-U1333, and 320-U1334 spanning magnetic polarity Chrons C12n to C20n. Subsequently orbital tuning of the records to the La2011 orbital solution was conducted. The resulting new timescale revises and refines the existing orbitally tuned age model and the geomagnetic polarity timescale from 31 to 43 Ma. The newly defined absolute age for the Eocene–Oligocene boundary validates the astronomical tuned age of 33.89 Ma identified at the Massignano, Italy, global stratotype section and point. The compilation of geochemical records of climate-controlled variability in sedimentation through the middle-to-late Eocene and early Oligocene demonstrates strong power in the eccentricity band that is readily tuned to the latest astronomical solution. Obliquity driven cyclicity is only apparent during 2.4 myr eccentricity cycle minima around 35.5, 38.3, and 40.1 Ma.

scholarly journals Impact of the Middle Eocene Climatic Optimum (MECO) on Foraminiferal and Calcareous Nannofossil Assemblages in the Neo-Tethyan Baskil Section (Eastern Turkey): Paleoenvironmental and Paleoclimatic Reconstructions

2021 ◽  
Vol 11 (23) ◽  
pp. 11339
Author(s):  
Roberta D’Onofrio ◽  
Amr S. Zaky ◽  
Fabrizio Frontalini ◽  
Valeria Luciani ◽  
Rita Catanzariti ◽  
...  
Keyword(s):  
Hydrological Cycle ◽  
Middle Eocene ◽  
Marine Biota ◽  
Partial Recovery ◽  
Calcareous Nannofossil ◽  
Eastern Turkey ◽  
Cooling Trend ◽  
Climatic Optimum

The Middle Eocene Climatic Optimum (MECO; ~40 Ma), which interrupted for ~500–600 kyr the long-term cooling trend culminating at the Eocene/Oligocene boundary, still requires a comprehensive understanding of the biotic resilience. Here we present a high-resolution integrated foraminiferal and calcareous nannofossil study across the MECO from the expanded and continuous Tethyan Baskil section (eastern Turkey) that offers a complete magneto-biostratigraphic and geochemical framework. The five MECO phases identified reveal a transition from oligotrophic (pre-MECO) to eu-mesotrophic conditions, possibly related to accelerated hydrological cycle, during the initial MECO and MECO δ13C negative excursion phases. The MECO WARMING PEAK phase, marking the highest carbonate dissolution interval, records the most striking biotic changes, such as peak in warm and eutrophic nannofossils, virtual disappearance of the oligotrophic planktic foraminiferal large Acarinina and Morozovelloides, and peak in eutrophic deep dwellers Subbotina. Benthic foraminifera suggest in this phase an improvement in the quality of organic matter to the seafloor. The post-MECO phase shows only a partial recovery of the pre-event conditions. Large Acarinina and Morozovelloides did not recover their abundance, possibly due to cooler conditions in this phase. Our reconstruction reveals how paleoenvironment and marine biota from the studied Neo-Tethyan setting reacted to the MECO perturbations.

scholarly journals Orbitally tuned time scale and astronomical forcing in the middle Eocene to early Oligocene

2013 ◽  
Vol 9 (6) ◽  
pp. 6635-6682 ◽  
Author(s):  
T. Westerhold ◽  
U. Röhl ◽  
H. Pälike ◽  
R. Wilkens ◽  
P. A. Wilson ◽  
...  
Keyword(s):  
High Resolution ◽  
Time Scale ◽  
Middle Eocene ◽  
Late Eocene ◽  
Magnetic Polarity ◽  
Driving Mechanisms ◽  
Early Oligocene ◽  
Age Model ◽  
Geomagnetic Polarity ◽  
New Time

Abstract. Deciphering the driving mechanisms of Earth system processes, including the climate dynamics expressed as paleoceanographic events, requires a complete, continuous, and high-resolution stratigraphy that is very accurately dated. In this study, we construct a robust astronomically calibrated age model for the middle Eocene to early Oligocene interval (31–43 Ma) in order to permit more detailed study of the exceptional climatic events that occurred during this time, including the Middle Eocene Climate Optimum and the Eocene/Oligocene transition. A goal of this effort is to accurately date the middle Eocene to early Oligocene composite section cored during the Pacific Equatorial Age Transect (PEAT, IODP Exp. 320/321). The stratigraphic framework for the new time scale is based on the identification of the stable long eccentricity cycle in published and new high-resolution records encompassing bulk and benthic stable isotope, calibrated XRF core scanning, and magnetostratigraphic data from ODP Sites 171B-1052, 189-1172, 199-1218, and 207-1260 as well as IODP Sites 320-U1333, and -U1334 spanning magnetic polarity Chrons C12n to C20n. Subsequently we applied orbital tuning of the records to the La2011 orbital solution. The resulting new time scale revises and refines the existing orbitally tuned age model and the Geomagnetic Polarity Time Scale from 31 to 43 Ma. Our newly defined absolute age for the Eocene/Oligocene boundary validates the astronomical tuned age of 33.89 Ma identified at the Massignano (Italy) global stratotype section and point. Our compilation of geochemical records of climate-controlled variability in sedimentation through the middle-to-late Eocene and early Oligocene demonstrates strong power in the eccentricity band that is readily tuned to the latest astronomical solution. Obliquity driven cyclicity is only apparent during very long eccentricity cycle minima around 35.5, 38.3 and 40.1 Ma.

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