Stromatolites in the Paratethys Sea during the Middle Miocene climate transition as witness of the Badenian salinity crisis

Facies ◽  
2013 ◽  
Vol 60 (2) ◽  
pp. 429-444 ◽  
Author(s):  
Mathias Harzhauser ◽  
Jörn Peckmann ◽  
Daniel Birgel ◽  
Erich Draganits ◽  
Oleg Mandic ◽  
...  
Keyword(s):  
Middle Miocene ◽  
Climate Transition

scholarly journals Boundary conditions for the Middle Miocene Climate Transition (MMCT v1.0)

2017 ◽  
Author(s):  
Amanda Frigola ◽  
Matthias Prange ◽  
Michael Schulz
Keyword(s):  
Boundary Conditions ◽  
General Circulation ◽  
Middle Miocene ◽  
Climate Models ◽  
Global Climate ◽  
Co2 Concentration ◽  
General Circulation Models ◽  
Global Climate Models ◽  
Ice Volume ◽  
Climate Transition

Abstract. The Middle Miocene Climate Transition was characterized by major Antarctic ice-sheet expansion and global cooling during the interval ~ 15–13 Ma. Here we present two sets of boundary conditions for global general circulation models characterizing the periods before (Middle Miocene Climatic Optimum; MMCO) and after (Middle Miocene Glaciation; MMG) the transition. These boundary conditions include Middle Miocene global topography, bathymetry and vegetation. Additionally, Antarctic ice volume and geometry, sea-level and atmospheric CO2 concentration estimates for the MMCO and the MMG are reviewed. The boundary-condition files are available for use as input in a wide variety of global climate models and constitute a valuable tool for modeling studies with a focus on the Middle Miocene.

scholarly journals Discovery of the Badenian evaporites inside the Carpathian Arc: implications for global climate change and Paratethys salinity

2017 ◽  
Vol 68 (3) ◽  
pp. 193-206 ◽  
Author(s):  
Katalin Báldi ◽  
Felicitász Velledits ◽  
Stjepan Ćorić ◽  
Viktor Lemberkovics ◽  
Katalin Lőrincz ◽  
...  
Keyword(s):  
Climate Change ◽  
Global Climate Change ◽  
Normal Saline ◽  
Middle Miocene ◽  
Global Climate ◽  
Great Plain ◽  
Geological Record ◽  
Central Paratethys ◽  
Growing Body ◽  
Climate Transition

Abstract Massive evaporites were discovered in the Soltvadkert Trough (Great Plain, Hungary) correlating to the Badenian Salinity Crisis (13.8 Ma, Middle Miocene) on the basis of nannoplankton and foraminifera biostratigraphy. This new occurrence from Hungary previously thought to be devoid of evaporites is part of a growing body of evidence of evaporitic basins inside the Carpathian Arc. We suggest the presence of evaporites perhaps in the entire Central Paratethys during the salinity crisis. Different scenarios are suggested for what subsequently happened to these evaporites to explain their presence or absence in the geological record. Where they are present, scenario A suggests that they were preserved in subsiding, deep basins overlain by younger sediments that protected the evaporites from reworking, like in the studied area. Where they are absent, scenario B suggests recycling. Scenario B explains how the supposedly brackish Sarmatian could have been hyper/normal saline locally by providing a source of the excess salt from the reworking and dissolving of BSC halite into seawater. These scenarios suggest a much larger amount of evaporites locked up in the Central Paratethys during the salinity crisis then previously thought, probably contributing to the step-like nature of cooling of the Mid Miocene Climate Transition, the coeval Mi3b.

MIOCENE NERITIC BENTHIC FORAMINIFERAL COMMUNITY DYNAMICS, CALVERT CLIFFS, MARYLAND, USA: SPECIES POOL, PATTERNS AND PROCESSES

Palaios ◽  
2021 ◽  
Vol 36 (7) ◽  
pp. 247-259
Author(s):  
STEPHEN J. CULVER ◽  
SETH R. SUTTON ◽  
DAVID J. MALLINSON ◽  
MARTIN A. BUZAS ◽  
MARCI M. ROBINSON ◽  
...  
Keyword(s):  
Sea Level ◽  
Benthic Foraminifera ◽  
Middle Miocene ◽  
Community Dynamics ◽  
Abundant Species ◽  
Common Species ◽  
Species Pool ◽  
Regional Species Pool ◽  
Patterns And Processes ◽  
Climate Transition

ABSTRACT The presence/absence and abundance of benthic foraminifera in successive discrete beds (Shattuck “zones”) of the Miocene Calvert and Choptank formations, exposed at the Calvert Cliffs, Maryland, USA, allows for investigation of community dynamics over space and time. The stratigraphic distribution of benthic foraminifera is documented and interpreted in the context of sea-level change, sequence stratigraphy, and the previously published distribution of mollusks. Neritic benthic foraminiferal communities of four sea-level cycles over ∼4 million years of the middle Miocene, encompassing the Miocene Climatic Optimum and the succeeding middle Miocene Climate Transition, are dominated by the same abundant species. They differ in the varying abundance of common species that occur throughout most of the studied section and in the different rare species that appear and disappear. Transgressive systems tracts (TSTs) have higher species diversity than highstand systems tracts (HSTs) but much lower density of specimens. In contrast to some previous research, all beds in the studied section are interpreted as being from the inner part of a broad, low gradient shelf and were deposited at water depths of less than ∼50 m. It is suggested that species are recruited from a regional species pool of propagules throughout the duration of TSTs. Recruitment is curtailed during highstands leading to lower diversity in the HSTs.

scholarly journals Comparative Genome and Transcriptome Analysis Reveals Gene Selection Patterns Along with the Paleo-Climate Change in the Populus Phylogeny

Forests ◽  
2019 ◽  
Vol 10 (2) ◽  
pp. 163
Author(s):  
You-jie Zhao ◽  
Chang-zhi Han ◽  
Yong Cao ◽  
Hua Zhou
Keyword(s):  
Positive Selection ◽  
Transcriptome Analysis ◽  
Middle Miocene ◽  
Gene Selection ◽  
Ice Age ◽  
Divergence Times ◽  
Evolutionary Patterns ◽  
Stress Genes ◽  
Paleoclimate Change ◽  
Climate Transition

Poplars are widely distributed in the northern hemisphere and have good adaptability to different living environments. The accumulation of genome and transcriptome data provides a chance to conduct comparative genomics and transcriptomics analyses to elucidate the evolutionary patterns of Populus phylogeny. Transcript sequences of eight Salicaceae species were downloaded from public databases. All of the pairwise orthologues were identified by comparative transcriptome analysis in these species, from which we constructed a phylogenetic tree and estimated the rate of divergence. The divergence times of the phylogenetic clades were mainly estimated during the Middle Miocene Climate Transition (MMCT) to Quaternary Ice Age. We also identified all of the fast-evolving sequences of positive selection and found some resistance genes that were related to environmental factors. Our results suggest that drought-, H2O2- and cold-stress genes are involved in positive selection along with the paleoclimate change. These data are useful in elucidating the evolutionary patterns and causes of speciation in the Populus lineage.

scholarly journals Obliquity and long eccentricity pacing of the Middle Miocene climate transition

2013 ◽  
Vol 14 (6) ◽  
pp. 1740-1755 ◽  
Author(s):  
Jun Tian ◽  
Mei Yang ◽  
Mitchell W. Lyle ◽  
Roy Wilkens ◽  
Julia K. Shackford
Keyword(s):  
Middle Miocene ◽  
Climate Transition

scholarly journals Timing of the Middle Miocene Badenian Stage of the Central Paratethys

2014 ◽  
Vol 65 (1) ◽  
pp. 55-66 ◽  
Author(s):  
Johann Hohenegger ◽  
Stjepan Ćorić ◽  
Michael Wagreich
Keyword(s):  
Sea Level ◽  
Middle Miocene ◽  
Planktonic Foraminifera ◽  
Sea Level Changes ◽  
Vienna Basin ◽  
Central Paratethys ◽  
Polarity Reversals ◽  
Global Events ◽  
Geomagnetic Polarity ◽  
Climate Transition

Abstract A new and precisely defined chronometric subdivision of the Badenian (Middle Miocene, regional stage of Central Paratethys) is proposed. This uses global events, mainly geomagnetic polarity reversals as correlated chronometric boundaries, supported by climatic and sea-level changes in addition to isotope events and biostratigraphic data. The Karpatian/ Badenian boundary lies at 16.303 Ma, at the top of Chron C5Cn.2n, which is near the base of the Praeorbulina sicana Lowest-occurrence Zone (LOZ). The Badenian/Sarmatian boundary is placed at the top of polarity Chron C5Ar.2n, thus at 12.829 Ma. In relation to three sea level cycles TB 2.3, TB 2.4 and TB 2.5 and astronomically confirmed data, the Badenian can be divided into three parts of nearly equivalent duration. The Early Badenian as newly defined here ranges from 16.303 to 15.032 Ma (top of polarity Chron C5Bn.2n). The younger boundary correlates roughly to the base of the planktonic foraminifera Orbulina suturalis LOZ at 15.10 Ma, the HO (Highest Occurrence) of the nannofossil Helicosphaera ampliaperta at 14.91 Ma (NN4/NN5 boundary) and the Lan2/Ser1 sequence boundary at 14.80 Ma. The subsequent Mid Badenian ranges from 15.032 Ma to 13.82 Ma; the latter datum correlates with the base of the Serravallian, characterized by a strong global cooling event reflected in the oxygen isotope event Mi3b. The main part of cycle TB 2.4 falls into the Mid Badenian, which can be subdivided by a short cooling event at 14.24 Ma during the Middle Miocene Climate Transition (14.70 to 13.82 Ma). The HCO (Highest common occurrence) of the nannofossil Helicosphaera waltrans at 14.357 Ma supports this division, also seen in the tropical plankton Zones M6 Orbulina suturalis LOZ and M7 Fohsella peripheroacuta LOZ that correspond roughly to the lower and upper Lagenidae zones in the Vienna Basin, respectively. The Late Badenian is delimited in time at the base to 13.82 Ma by the Langhian/Serravallian boundary and at the top by the top of polarity Chron C5Ar.2n at 12.829 Ma. The Mediterranean Langhian/Serravallian boundary can be equated with the Mid/Late Badenian boundary at 13.82 Ma. However, the Karpatian/Badenian boundary at 16.303 Ma, a significant event easily recognizable in biostratigraphy, paleoclimate evolution and sequence stratigraphy, cannot be equated with the proposed global Burdigalian/Langhian, and thus Early/Middle Miocene boundary, at 15.974 Ma

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