Vegetation, sea-level, and climate changes during the Messinian salinity crisis

Jiménez‐Moreno, Gonzalo; Pérez-Asensio, José N.; Larrasoaña, Juan C.; Aguirre, Julio; Civis, Jorge; Carballo, María Rosario Rivas; Valle-Hernández, María F.; Delgado, José Ángel González

doi:10.1130/b30663.1

Cited by 50 publications

(32 citation statements)

References 66 publications

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“…As discussed in section 2, late Miocene glacial periods (insolation minima) tend to be characterized by arid conditions in Northern Africa and the Mediterranean, and conversely insolation maxima are associated with warm, wetter conditions [ Cosentino et al ., ; van der Laan et al ., ; Jiménez‐Moreno et al ., ]. By comparing 87 Sr/ 86 Sr values throughout the astronomically tuned Maiella section with astronomical forcing and δ 18 O records (Figure ), we can explore how global forcing affected the Sr isotope patterns.…”

Section: Discussionmentioning

confidence: 99%

Sea level and climate forcing of the Sr isotope composition of lateMioceneMediterranean marine basins

Schildgen

Cosentino

Frijia

et al. 2014

Geochem Geophys Geosyst

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Sr isotope records from marginal marine basins track the mixing between seawater and local continental runoff, potentially recording the effects of sea level, tectonic, and climate forcing in marine fossils and sediments. Sr/ 86 Sr analyses from the astronomically tuned Lower Evaporites in the central Apennines (Italy) allow us to explore the effect of glacio-eustatic sea level and precipitation changes on 87 Sr/ 86 Sr. Most variation in our data can be explained by changes in sea level, with greatest negative excursions from global seawater values occurring during relative sea level lowstands, which generally coincided with arid conditions in the Mediterranean realm. We suggest that this greater sensitivity to lowered sea level compared with higher runoff could relate to the inverse relationship between Sr concentration and river discharge. Variations in the residence time of groundwater within the karst terrain of the circum-Mediterranean region during arid and wet phases may help to explain the single (robust) occurrence of a negative excursion during a sea level highstand, but this explanation remains speculative without more detailed paleoclimatic data for the region.

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Section: Discussionmentioning

confidence: 99%

Sea level and climate forcing of the Sr isotope composition of lateMioceneMediterranean marine basins

Schildgen

Cosentino

Frijia

et al. 2014

Geochem Geophys Geosyst

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“…Additional tie points for the age model are provided by identification of glacial-interglacial stages TG 7, 12, and 22 from oxygen isotope data (Pérez-Asensio et al, 2012a; Jiménez-Moreno et al, 2013). Type 1 and 2 samples are as in Figure 3 .…”

Section: Methodsmentioning

confidence: 99%

Paleomagnetic and paleoenvironmental implications of magnetofossil occurrences in late Miocene marine sediments from the Guadalquivir Basin, SW Spain

Larrasoaña¹,

Liu²,

Hu³

et al. 2014

Front. Microbiol.

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Although recent studies have revealed more widespread occurrences of magnetofossils in pre-Quaternary sediments than have been previously reported, their significance for paleomagnetic and paleoenvironmental studies is not fully understood. We present a paleo- and rock-magnetic study of late Miocene marine sediments recovered from the Guadalquivir Basin (SW Spain). Well-defined paleomagnetic directions provide a robust magnetostratigraphic chronology for the two studied sediment cores. Rock magnetic results indicate the dominance of intact magnetosome chains throughout the studied sediments. These results provide a link between the highest-quality paleomagnetic directions and higher magnetofossil abundances. We interpret that bacterial magnetite formed in the surface sediment mixed layer and that these magnetic particles gave rise to a paleomagnetic signal in the same way as detrital grains. They, therefore, carry a magnetization that is essentially identical to a post-depositional remanent magnetization, which we term a bio-depositional remanent magnetization. Some studied polarity reversals record paleomagnetic directions with an apparent 60–70 kyr recording delay. Magnetofossils in these cases are interpreted to carry a biogeochemical remanent magnetization that is locked in at greater depth in the sediment column. A sharp decrease in magnetofossil abundance toward the middle of the studied boreholes coincides broadly with a major rise in sediment accumulation rates near the onset of the Messinian salinity crisis (MSC), an event caused by interruption of the connection between the Mediterranean Sea and the Atlantic Ocean. This correlation appears to have resulted from dilution of magnetofossils by enhanced terrigenous inputs that were driven, in turn, by sedimentary changes triggered in the basin at the onset of the MSC. Our results highlight the importance of magnetofossils as carriers of high-quality paleomagnetic and paleoenvironmental signals even in dominantly terrigenous sediments.

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“…This long‐standing debate can be largely attributed to the (1) complex Messinian palaeogeography of the Mediterranean area associated with a variety of local tectono‐sedimentary regimes, to the (2) continuing problem of accurate correlation between both deep basin and marginal‐basin deposits”, but also to the (3) discrepancy of accurate chronology between the (high resolution) global climate record (Ohneiser et al., ; Pérez‐Asensio et al., ; Van der Laan et al., ) and the relatively (rough) global tectonic record. If the link between astronomical forcing (Van der Laan et al., ) or Antarctic glacio‐eustatic contributions (Jiménez‐Moreno et al., ; Ohneiser et al., ) to Late Miocene Mediterranean dessication and reflooding have been clearly demonstrated, detailed tectonic processes closing the Rifian Corridor began now to be accurately defined. Several recent data suggest that the last Mediterranean‐Atlantic gateway in function, the Rifian Corridor, was closed significantly before the onset of the MSC.…”

Section: Results: a Worldwide Tectonic Event 6 Ma Agomentioning

confidence: 99%

The late Messinian event: A worldwide tectonic revolution

et al. 2018

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A review of geological and geophysical observations points towards a worldwide kinematic change at around 6 Ma. The synchronicity of many manifestations (tectonics, magmatism, kinematics, ecological events, among others) at~6 Ma, similar to those recognized from time to time on the geological time-scale, argues for a global geodynamic event that has led to many regional consequences on Earth's surface.In particular, we propose that this global event was the main trigger for the three fold increase in sediment deposits in the world ocean over the last~5 Ma, but also for the onset of the Messinian Salinity Crisis in the Mediterranean area, one of the most severe ecological crises in the Earth's history. We suggest this Messinian revolution to be the last occurrence of cyclic successions of global events.

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Vegetation, sea-level, and climate changes during the Messinian salinity crisis

Cited by 50 publications

References 66 publications

Sea level and climate forcing of the Sr isotope composition of lateMioceneMediterranean marine basins

Sea level and climate forcing of the Sr isotope composition of lateMioceneMediterranean marine basins

Paleomagnetic and paleoenvironmental implications of magnetofossil occurrences in late Miocene marine sediments from the Guadalquivir Basin, SW Spain

The late Messinian event: A worldwide tectonic revolution

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