A LATE MIOCENE – EARLY PLIOCENE PARATETHYAN TYPE OSTRACOD FAUNA FROM THE DENIZLI BASIN (SW ANATOLIA) AND ITS PALAEOGEOGRAPHIC IMPLICATIONS

Acta Palaeontologica Romaniae ◽

10.35463/j.apr.2020.02.01 ◽

2020 ◽

pp. 3-56

Author(s):

LEA RAUSCH ◽

MARIUS STOICA ◽

SERGEI LAZAREV

Keyword(s):

Late Miocene ◽

Brackish Water ◽

Brackish Lake ◽

Early Pliocene ◽

Upper Miocene ◽

Excellent Opportunity ◽

Sedimentary Succession ◽

Lake Habitats

The upper Miocene – lower Pliocene sedimentary succession of the Denizli Basin (SW Anatolia) displays a unique record of undisturbed stratigraphy and provides an excellent opportunity to study long-term palaeoecological changes. This paper documents the ostracod assemblages of two sections of the Neogene Kolankaya Formation, resulting in the following taxonomic, palaeobiogeographic and ecological interpretations. The ostracod assemblages from the two sections consist of a mixture of oligohaline to mesohaline tolerant taxa but expose fundamental differences in their composition. This is reflected by the fact that out of 32 determined species, both sections only have 3 in common. In the stratigraphic older succession, the diverse ostracod fauna resembles taxa known from the Paratethys. Faunal relations to the brackish lake habitats of the Euxinic and Pannonian basins are apparent and the palaeobiogeographic significance of the fauna is discussed. The ostracod association of the younger section indicates a low brackish water habitat with fluctuating salinities, most likely in the oligohaline range. The ostracod assemblage of the Kolankaya Formation only permits a broad age assignment to the late Miocene – early Pliocene.

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The Late Miocene-Early Pliocene out-of-sequence thrusting event: new insights into the tectonic evolution of the southern Apennines (Italy)

10.5194/egusphere-egu21-803 ◽

2021 ◽

Author(s):

Vitale Stefano ◽

Prinzi Ernesto Paolo ◽

Francesco D'Assisi Tramparulo ◽

Sabatino Ciarcia

Keyword(s):

Late Miocene ◽

Hanging Wall ◽

Early Pleistocene ◽

Normal Faults ◽

Southern Apennines ◽

Campania Region ◽

Early Pliocene ◽

Upper Miocene ◽

Thrust System ◽

Tectonic Windows

<p>We present a structural study on late Miocene-early Pliocene out-of-sequence thrusts affecting the southern Apennine chain. The analyzed structures are exposed in the Campania region (southern Italy). Here, leading thrusts bound the N-NE side of the carbonate ridges that form the regional mountain backbone. In several outcrops, the Mesozoic carbonates are superposed onto the unconformable wedge-top basin deposits of the upper Miocene Castelvetere Group, providing constraints to the age of the activity of this thrusting event. We further analyzed the tectonic windows of Giffoni and Campagna, located on the rear of the leading thrust. We reconstructed the orogenic evolution of this part of the orogen. The first was related to the in-sequence thrusting with minor thrusts and folds, widespread both in the footwall and in the hanging wall. A subsequent extension has formed normal faults crosscutting the early thrusts and folds. All structures were subsequently affected by two shortening stages, which also deformed the upper Miocene wedge top basin deposits of the Castelvetere Group. We interpreted these late structures as related to an out-of-sequence thrust system defined by a main frontal E-verging thrust and lateral ramps characterized by N and S vergences. Associated with these thrusting events, LANFs were formed in the hanging wall of the major thrusts. Such out-of-sequence thrusts are observed in the whole southern Apennines and record a thrusting event that occurred in the late Messinian-early Pliocene. We related this tectonic episode to the positive inversion of inherited normal faults located in the Paleozoic basement. These envelopments thrust upward crosscut the allochthonous wedge, including, in the western zone of the chain, the upper Miocene wedge-top basin deposits. Finally, we suggest that the two tectonic windows are the result of the formation of an E-W trending regional antiform, associated with a late S-verging back-thrust, that has been eroded and crosscut by Early Pleistocene normal faults.</p>

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The presence of marin Pliocene sendiments in the Mesohellenic Trough (Pramoritsa banks, Grevena, Greece)

Bulletin of the Geological Society of Greece ◽

10.12681/bgsg.17108 ◽

2018 ◽

Vol 34 (2) ◽

pp. 603

Author(s):

Ι. ΦΟΥΝΤΟΥΛΗΣ ◽

Α. ΜΑΡΚΟΠΟΥΛΟΥ-ΔΙΑΚΑΝΤΩΝΗ ◽

Α. ΜΠΑΚΟΠΟΥΛΟΥ ◽

Ε. ΜΩΡΑΪΤΗ ◽

Μ. Ρ. ΜΙΡΚΟΥ ◽

...

Keyword(s):

Late Miocene ◽

Depositional Environment ◽

Systematic Sampling ◽

Early Pliocene ◽

Upper Miocene ◽

Marine Facies ◽

River Banks

Detailed lithostratigraphic study of the postalpine deposits that build Pramoritsa river banks - tributary of Aliakmonas river- north of Grevena (Greece), showed that the marine molassic deposition did not cease in the Upper Miocene but continued in the Lower Pliocene, too. Systematic sampling revealed abundant pelagic and benthic fossils, the presence of which {Bulimina exilis, Bulimina costata, Neogloboquadrina acostaensis, Globigerinella pseudobesa, Globoquadrina venezuelana, Neoeponides schreibersii, Pulleniatina obliquiloculata, Dorothia gibbosa) proves that marine facies went on, at least, until the Lower Pliocene and that the depositional environment was characterized as coastal with warm waters. According to the Nannoplankton flora correlated with standard nannoplankton -zones-subzones NNllb Amaurolithus delicatus, Discoaster quinqueramus) and NN13 (Ceratolithus rugosus) of MARTINI, 1971 and OKADA & BUKRY, 1980 during the Late Miocene -Early Pliocene. Besides, some characteristics of the Pliocene sediments are described, based on macro- and microscopic observations.

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Long-term, sustained reduction in ocean productivity initiated at 4.6-4.4 Ma

10.5194/egusphere-egu21-10071 ◽

2021 ◽

Author(s):

Boris Theofanis Karatsolis ◽

Bryan Lougheed ◽

David De Vleeschouwer ◽

Jorijntje Henderiks

Keyword(s):

Primary Productivity ◽

Late Miocene ◽

Nutrient Budget ◽

Orbital Eccentricity ◽

Early Pliocene ◽

Sustained Reduction ◽

Ocean Productivity ◽

Lower Amplitude ◽

Marine Primary Productivity

<p>The late Miocene to early Pliocene was a time of global cooling, albeit in a warmer-than present climate state. Increased marine primary productivity characterizes this interval, often referred to as the late Miocene-early Pliocene biogenic bloom (~9-3.5 Ma). To explain its manifestation, paleoceanographers often involve ocean gateway or monsoon-related mechanisms, formulating hypotheses of increased or redistributed nutrients in the ocean. However, the exact cause-and-effect chains remain obscure, since important diachronicity is observed across ocean basins for the main phase and the termination of this event. Here, we compile proxy data for late Miocene to Pliocene paleoproductivity from all major ocean basins, including calcareous and siliceous plankton groups. By systematically evaluating the age-depth model accuracies of previously published records we demonstrate that a globally synchronous and long-sustained reduction in primary productivity was initiated with a sharp decline between 4.6 and 4.4 Ma. Our compilation supports that relatively rapid processes (~200 kyr) influenced nutrient availability towards the end of the biogenic bloom. By evaluating different mechanisms influencing the ocean nutrient budget on such time scales, we propose orbital forcing as an important candidate to have tipped the balance towards a less productive ocean. We show that this decline in productivity coincided with a prolonged period of low orbital eccentricity and a shift towards lower-amplitude obliquity. This specific astronomical configuration prevents the development of extreme seasonal contrasts which could lead to reduced nutrient supply to the ocean due to decreased riverine influx.</p>

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Late Miocene-Early Pliocene Out-of-Sequence Thrusting in the Southern Apennines (Italy)

Geosciences ◽

10.3390/geosciences10080301 ◽

2020 ◽

Vol 10 (8) ◽

pp. 301 ◽

Cited By ~ 1

Author(s):

Stefano Vitale ◽

Ernesto Paolo Prinzi ◽

Francesco D’Assisi Tramparulo ◽

Claudio De Paola ◽

Rosa Di Maio ◽

...

Keyword(s):

Late Miocene ◽

Hanging Wall ◽

Normal Faults ◽

Campania Region ◽

Early Pliocene ◽

Upper Miocene ◽

The North ◽

Thrust System ◽

Platform Carbonates ◽

North And South

We present a structural study on late Miocene-early Pliocene out-of-sequence thrusts affecting the southern Apennine orogenic belt. The analyzed structures are exposed in the Campania region (southern Italy). Here, thrusts bound the N-NE side of the carbonate ridges that form the regional mountain backbone. In several outcrops, the Mesozoic carbonates are superposed onto the unconformable wedge-top basin deposits of the upper Miocene Castelvetere Group, providing constraints to the age of the activity of this thrusting event. Moreover, a 4-km-long N-S oriented electrical resistivity tomography profile, carried out along the Caserta mountains, sheds light on the structure of this thrust system in an area where it is not exposed. Further information was carried out from a tunnel excavation that allowed us to study some secondary fault splays. The kinematic analysis of out-of-sequence major and minor structures hosted both in the hanging wall (Apennine Platform carbonates) and footwall (Castelvetere Group deposits and Lagonegro-Molise Basin units) indicates the occurrence of two superposed shortening directions, about E-W and N-S, respectively. We associated these compressive structures to an out-of-sequence thrusting event defined by frontal thrusts verging to the east and lateral ramp thrusts verging to the north and south. We related the out-of-sequence thrusting episode to the positive inversion of inherited normal faults located in the Paleozoic basement. These envelopments thrust upward to crosscut the allochthonous wedge, including, in the western zone of the chain, the upper Miocene wedge-top basin deposits.

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