Distinguishing Depositional Environments In Shallow-Water Mixed, Bio-Siliciclastic Deposits On the Basis Of The Degree Of Heterolithic Segregation (Gelasian, Southern Italy)

2012 ◽  
Vol 82 (12) ◽  
pp. 969-990 ◽  
Author(s):  
D. Chiarella ◽  
S. G. Longhitano
Keyword(s):  
Shallow Water ◽  
Southern Italy ◽  
Depositional Environments

A new tool to detect exposure surfaces in shallow water carbonate depositional environments

2002 ◽  
Vol 45 (3) ◽  
pp. 301-317 ◽  
Author(s):  
Andrea Mindszenty ◽  
J. Ferenc Deák ◽  
Mária Fölvári
Keyword(s):  
Shallow Water ◽  
Depositional Environments ◽  
Water Carbonate ◽  
Shallow Water Carbonate

scholarly journals Remarks on the Messinian evaporites of Zakynthos Island (Io- nian Sea, Eastern Mediterranean).

2016 ◽  
Vol 47 (1) ◽  
pp. 146 ◽  
Author(s):  
V. Karakitsios ◽  
M. Roveri ◽  
S. Lugli ◽  
V. Manzi ◽  
R. Gennari ◽  
...  
Keyword(s):  
Shallow Water ◽  
Eastern Mediterranean ◽  
Thickness Distribution ◽  
Planktonic Foraminifera ◽  
Water Environment ◽  
Foreland Basin ◽  
Seismic Profile ◽  
Depositional Environments ◽  
Borehole Data ◽  
Neogene Sediments

Detailed mapping of the Neogene deposits on Zakynthos Island shows that the Messinian primary evaporite basins, formed over Ionian basement, are delimited by the westernmost outcrop of the Triassic evaporitic diapirs, located west of the Kalamaki-Argasi Messinian gypsum unit. The post-Miocene external Ionian thrust is emplaced west of the Triassic diapirs. Planktonic foraminifera biostratigraphy indicates that primary evaporite accumulation took place probably during the first stage of the Messinian salinity crisis (5.96-5.60 Ma), in shallower parts of a foreland basin, formed over the Pre-Apulian and the Ionian zone basement. Establishment of these depositional environments, before the Ionian thrust emplacement, was probably due to the particularities of the foreland basin, which extended from the external Ionian to the internal Pre-Apulian zone. Field observations, borehole data and an onshore seismic profile show that the Neogene sediments over the Pre-Apulian  basement correspond to the foredeep through forebulge domain of the foreland basin, as it is documented from their spatial thickness distribution. In contrast, the Neogene sediments over the Ionian basement correspond to the wedge top of the foreland basin, which was less subsiding, as it is deduced by their reduced thickness. This lower subsidence rate was the result of the concurrent diapiric movements of the Ionian Triassic evaporites. In Agios Sostis area, located over Pre-Apulian basement, the Neogene sequence is intercalated by decametre-thick resedimented blocks consisting of shallow water selenite. To the southeast, this mass-wasting Messinian gypsum passes to mainly gypsum turbidite. In Kalamaki-Argasi area, located over Ionian basement, the shallow water environment led to the deposition of the observed primary gypsum. Erosion of the primary gypsum of both forebulge and wedge top supplied the foreland basin’s depocenter with gypsum turbidites.

scholarly journals A new method to assess long‐term sea‐bottom vertical displacement in shallow water using a bottom pressure sensor: Application to Campi Flegrei, Southern Italy

2016 ◽  
Vol 121 (11) ◽  
pp. 7775-7789 ◽  
Author(s):  
Francesco Chierici ◽  
Giovanni Iannaccone ◽  
Luca Pignagnoli ◽  
Sergio Guardato ◽  
Marina Locritani ◽  
...  
Keyword(s):  
Shallow Water ◽  
Pressure Sensor ◽  
Southern Italy ◽  
Vertical Displacement ◽  
New Method ◽  
Campi Flegrei ◽  
Bottom Pressure ◽  
Sensor Application ◽  
Sea Bottom

Mercury anomalies in Palaeocene-Eocene Thermal Maximum (PETM) successions of Pyrenean peripheral basins: new evidence of a plausible link between volcanic emissions from the North Atlantic large igneous province and the PETM

2020 ◽  
Author(s):  
Maxime Tremblin ◽  
Hassan Khozyem ◽  
Jorge E. Spangenberg ◽  
Charlotte Fillon ◽  
Eric Lasseur ◽  
...  
Keyword(s):  
Shallow Water ◽  
Carbon Isotope ◽  
North Atlantic ◽  
Depositional Environments ◽  
Volcanic Emissions ◽  
The North ◽  
Thermal Maximum ◽  
Igneous Province ◽  
Hyperthermal Events ◽  
The North Atlantic

<p>The Palaeogene represents the last “greenhouse” period characterized by high atmospheric CO<sub>2</sub> concentrations and warm surface temperatures. This long-term climatic state was punctuated by several transient hyperthermal events. These events are recorded primarily by prominent negative carbon isotope excursions (NCIE) in both carbonates and organic matter of sedimentary successions. The largest hyperthermal of the Palaeogene, the Palaeocene-Eocene Thermal Maximum (PETM), is associated with a 5-8° rise in global temperature, ocean acidification and a global biotic perturbation. The PETM is thus often seen as a geological analogue for future greenhouse-gas-driven global warming. The source of the <sup>13</sup>C-depleted carbon for the NCIE and whether it was released in one or numerous events however remains controversial. Numerous carbon sources have been suggested, either in concert or individually to explain the onset and the duration of the NCIE. These include magmatic as well as thermogenic release of CO<sub>2</sub> associated with large scale magmatism. Over the last decade, mercury (Hg) found in marine and continental sedimentary succession has emerged as a potential proxy of past volcanic emissions, allowing to trace the relationship between the emplacement of Large Igneous Provinces (LIP) and periods of warming, mass extinctions, and biotic disruptions.</p><p>Although the PETM is widely recorded in pelagic and hemipelagic settings, its record in shallow-water and continental successions remains scarce due to frequent hiatuses and unconformities in such environments and a lack of enough biostratigraphic constraints. However, the high sedimentation rate, which may characterize shallow water settings, compared to deeper marine environments, may potentially preserve expanded NCIE successions to better understand the nature and causes of the PETM</p><p>In this study, we present the first synthetic high-resolution mercury and stable isotopic records of three shallow-water and continental successions from highly subsident peripheral basins North (Lussagnet) and South (Serraduy and Esplugrafreda) of the Pyrenean orogen across the PETM. In those sections, our results show two important negative carbon isotope excursions in the bulk-rock carbonates. Based on biostratigraphy and similarity of shape and amplitude of the isotopic excursions with global records, the largest NCIE is interpreted as the NCIE associated with the PETM. This excursion is immediately preceded by another NCIE, second largest in amplitude in our record, and that we interpret as the Pre-Onset Excursion (POE), found in few other profiles worldwide. The occurrence of the POE suggests a first episode of <sup>13</sup>C-depleted carbon release before the onset of the PETM. These various NCIE are associated with important mercury anomalies, even when normalized to total organic content. This suggests that pulses of magmatism, probably associated to the emplacement of the North Atlantic Igneous Province (NAIP), contributed to the onset and to the long duration of the PETM.</p><p>Our work confirms that hyperthermal events of the Palaeogene can be well recorded in shallow water and continental successions and can be used as powerful stratigraphic tools for these depositional environments, in addition to providing information on the climatic perturbations associated with the PETM.</p><p> </p><p>This work is founded and carried out in the framework of the BRGM-TOTAL project Source-to-Sink.</p>

Seismic stratigraphy of upper Quaternary shallow-water contourite drifts in the Gulf of Taranto (Ionian Sea, southern Italy)

2018 ◽  
Vol 397 ◽  
pp. 79-92 ◽  
Author(s):  
F. Pepe ◽  
V. Di Donato ◽  
D. Insinga ◽  
F. Molisso ◽  
C. Faraci ◽  
...  
Keyword(s):  
Shallow Water ◽  
Southern Italy ◽  
Seismic Stratigraphy ◽  
Ionian Sea ◽  
Contourite Drifts

scholarly journals Meteoric diagenesis of Upper Cretaceous and Paleocene-Eocene shallow-water carbonates in the Kruja Platform (Albania): geochemical evidence

2009 ◽  
Vol 60 (2) ◽  
pp. 165-179 ◽  
Author(s):  
Grigor Heba ◽  
Gilbert Prichonnet ◽  
Abderrazak El Albani
Keyword(s):  
Shallow Water ◽  
Sea Level ◽  
Upper Cretaceous ◽  
Carbonate Platform ◽  
Middle Eocene ◽  
Depositional Environments ◽  
Passive Margin ◽  
Buffer System ◽  
Geochemical Evidence ◽  
Meteoric Diagenesis

Meteoric diagenesis of Upper Cretaceous and Paleocene-Eocene shallow-water carbonates in the Kruja Platform (Albania): geochemical evidenceIn the central part of the Kruja Platform (Albania) located in the Apulian passive margin, geochemical analyses (calcimetry, Sr, REE and isotopic, δ13C and δ18O) coupled with sedimentological and sequence stratigraphic study were carried out on Upper Cretaceous (CsB4, CsB5, CsB6 Biozones) and Paleocene to Middle Eocene shallow-water carbonates that crop out in the Kruje-Dajt massif (L'Escalier section) and Makareshi massif (La Route section). The lower values in Sr contents, the homogeneous δ18O values in both sections and the covariance between δ13C and δ18O values (La Route section) are attributed to diagenesis influence by a meteoric water-buffer system, supported by petrographic observations. Moreover, a new exposure surface during the Late Cretaceous time (between CsB5 and CsB6 Biozones) may be proposed according to the low or negative excursions of Sr values, the negative excursions of isotopic values in both sections and a positive peak of normalized REE values (La Route section). These variations correlate with the geochemical signal reported by the decreasing strontium isotope values of rudist shells in the Island of Brač carbonate platform (Apulia domain) during the late Middle Campanian (77.3 Ma). Also, this continental exposure is consistent with the global sea-level fall reported from the Boreal Realm, North Atlantic, and the southern Tethyan margin. This geochemical evidence is a complementary tool for the sedimentological analysis and suggests a maximum regression (a sea-level fall) at the transition between the CsB5 and CsB6 Biozones. The high values of Sr content in Middle Eocene carbonates (L'Escalier section) reflect changes in depositional environment from restricted to open marine conditions. REE values increase through transgressive systems tract, characterized by small increase of detrital input. However, anomalies of certain values in both sections suggest disturbances linked either to the changes in clay input and to diagenetic modifications. Peaks in dolomite content are linked with regressive episodes or tendencies, and dolomitic facies, as indicated by intertidal-supratidal depositional environments.

Sign in / Sign up

Export Citation Format

Share Document