Lower and Middle Miocene Carbonate Facies in the Central MediterraneanThe Impact of Paleoceanography on Sequence Stratigraphy

1999 ◽  
Author(s):  
Maria Mutti ◽  
Daniel Bernoulli ◽  
Silvia Spezzaferri ◽  
Peter Stille
Keyword(s):  
Sequence Stratigraphy ◽  
Middle Miocene ◽  
Carbonate Facies ◽  
Central Mediterranean ◽  
The Impact

scholarly journals African dust outbreaks over the Mediterranean Basin during 2001–2011: PM<sub>10</sub> concentrations, phenomenology and trends, and its relation with synoptic and mesoscale meteorology

2012 ◽  
Vol 12 (10) ◽  
pp. 28195-28235 ◽  
Author(s):  
J. Pey ◽  
X. Querol ◽  
A. Alastuey ◽  
F. Forastiere ◽  
M. Stafoggia
Keyword(s):  
Mediterranean Basin ◽  
Mediterranean Area ◽  
Moderate Intensity ◽  
Sharp Change ◽  
Central Mediterranean ◽  
Mesoscale Meteorology ◽  
Transitional Area ◽  
African Dust ◽  
The Mediterranean ◽  
The Impact

Abstract. The occurrence of African dust outbreaks over the whole Mediterranean Basin has been identified on an 11-yr period (2001–2011). In order to evaluate the impact of such mineral dust outbreaks on ambient concentrations of particulate matter, PM10 data from regional and suburban background sites across the Mediterranean area were compiled. After identifying the daily influence of African dust, a methodology for estimating natural dust contributions on daily PM10 concentrations was applied. Our results reveal that African dust outbreaks occur with much higher frequency in southern areas of the Mediterranean, from 30 to 37% of the annual days, whereas they take place less than 20% of the annual days in northern sites. The central Mediterranean emerges as a transitional area, with slightly higher frequency of dust episodes in its lower extreme when compared to equivalent areas in western and eastern sides of the Basin. A decreasing south to north gradient of African dust contribution to PM10 is patent across the Mediterranean. Our study demonstrates that this gradient may be mainly explained by the latitudinal position. A longitudinal increasing trend of African dust contribution to PM10 is also observed from 25° E eastwards, and is due to the annual occurrence of intense dust episodes. Thus, the slightly higher frequency of African dust episodes over the lower part of Central Mediterranean is compensated by its moderately lower intensity. Concerning seasonality patterns and intensity characteristics, a clear summer prevalence is observed in the western part, with low occurrence of severe episodes (daily dust averages over 100 μg m−3 in PM10); no seasonal trend is detected in the central region, with moderate-intensity episodes; and significantly higher contributions are common in autumn-spring in the eastern side, with yearly occurrence of various severe episodes. Overall, African dust emerges as the largest PM10 source in regional background southern areas of the Mediterranean (35–50% of PM10), with seasonal peak contributions to PM10 up to 80% of the total mass. The multi-year study of African dust episodes and their contributions to PM10 concentrations allowed us to identify a consistent decreasing trend in the period 2006/2007 to 2011 in 4 of the 17 studied regions, all of them located in the NW of the Mediterranean. The observed trend is almost parallel to the NAO (North Atlantic Oscillation) index for the summer period, progressively more negative since 2006 onwards. As a consequence, a sharp change in the atmospheric circulation over the last 5 yr (a similar negative NAO period occurred in the 1950 decade) have affected the number of African dust episodes and their mean contribution to PM10 in the NW part of the Mediterranean. The investigation of summer temperatures at 850 hPa suggest that warm air accomplishing African dust air masses moved anomalously through the central Mediterranean in the 2007–2008 period, whereas it was displaced atypically to the NW African coast and the Canary Islands in the 2009–2011 period.

Reservoir Quality of the Miocene Formation Gas Deposits, Onshore Abu Dhabi

2021 ◽  
Author(s):  
Catherine Breislin ◽  
Laura Galluccio ◽  
Kate Al Tameemi ◽  
Riaz Khan ◽  
Atef Abdelaal
Keyword(s):  
Depositional Environment ◽  
Middle Miocene ◽  
Quality Analysis ◽  
Reservoir Quality ◽  
Carbonate Facies ◽  
Pore System ◽  
Thin Sections ◽  
Reservoir Architecture ◽  
Porosity And Permeability ◽  
Permeability Anisotropy

Abstract Understanding reservoir architecture is key to comprehend the distribution of reservoir quality when evaluating a field's prospectivity. Renewed interest in the tight, gas-rich Middle Miocene anhydrite intervals (Anh-1, Anh-2, Anh-3, Anh-4 and Anh-6) by ADNOC has given new impetus to improving its reservoir characterisation. In this context, this study provides valuable new insights in geological knowledge at the field scale within a formation with limited existing studies. From a sedimentological point of view, the anhydrite layers of the Miocene Formation, Anh-1, Anh-2, Anh-3, Anh-4 and Anh-6 (which comprise three stacked sequences: Bur1, Bur2 and Bur3; Hardenbol et al., 1998), have comparable depositional organisation throughout the study area. Bur1 and Bur2 are characterised by an upward transition from intertidal-dominated deposits to low-energy inner ramp-dominated sedimentation displaying reasonably consistent thickness across the area. Bur3 deposits imply an initial upward deepening from an argillaceous intertidal-dominated to an argillaceous subtidal-dominated setting, followed by an upward shallowing into intertidal and supratidal sabkha-dominated environments. This Bur3 cycle thickens towards the south-east due to a possible deepening, resulting in the subtle increase in thickness of the subtidal and intertidal deposits occurring around the maximum-flooding surface. The interbedded relationship between the thin limestone and anhydrite layers within the intertidal and proximal inner ramp deposits impart strong permeability anisotropy, with the anhydrite acting as significant baffles to vertical fluid flow. A qualitative reservoir quality analysis, combining core sedimentology data from 10 wells, 331 CCA data points, 58 thin-sections and 10 SEM samples has identified that reservoir layers Anh-4 and Anh-6 contain the best porosity and permeability values, with the carbonate facies of the argillaceous-prone intertidal and distal inner ramp deposits hosting the best reservoir potential. Within these facies, the pore systems within the carbonate facies are impacted by varying degrees of dolomitisation and dissolution which enhance the pore system, and cementation (anhydrite and calcite), which degrade the pore system. The combination of these diagenetic phases results in the wide spread of porosity and permeability data observed. The integration of both the sedimentological features and diagenetic overprint of the Middle Miocene anhydrite intervals shows the fundamental role played by the depositional environment in its reservoir architecture. This study has revealed the carbonate-dominated depositional environment groups within the anhydrite stratigraphic layers likely host both the best storage capacity and flow potential. Within these carbonate-dominated layers, the thicker, homogenous carbonate deposits would be more conducive to vertical and lateral flow than thinner interbedded carbonates and anhydrites, which may present as baffles or barriers to vertical flow and create significant permeability anisotropy.

The impact of marine litter from fish aggregation devices on vulnerable marine benthic habitats of the central Mediterranean Sea

2020 ◽  
Vol 152 ◽  
pp. 110928 ◽  
Author(s):  
Pierpaolo Consoli ◽  
Mauro Sinopoli ◽  
Alan Deidun ◽  
Simonepietro Canese ◽  
Claudio Berti ◽  
...  
Keyword(s):  
Mediterranean Sea ◽  
Central Mediterranean ◽  
Benthic Habitats ◽  
Marine Litter ◽  
Central Mediterranean Sea ◽  
Fish Aggregation ◽  
The Impact

Biostratigraphy, sequence stratigraphy, and paleoecology of the Lower–Middle Miocene of Northern Bandar Abbas, Southeast Zagros basin in south of Iran

2013 ◽  
Vol 7 (5) ◽  
pp. 1829-1855 ◽  
Author(s):  
Akbar Heidari ◽  
Asadollah Mahboubi ◽  
Reza Moussavi-Harami ◽  
Luis Gonzalez ◽  
Seyed Ali Moalemi
Keyword(s):  
Sequence Stratigraphy ◽  
Middle Miocene ◽  
Zagros Basin ◽  
Bandar Abbas

Ethnicity, Entrepreneurship, and Exchange: Mediterranean Inter-island Relations in the Late Bronze Age

1990 ◽  
Vol 85 ◽  
pp. 115-153 ◽  
Author(s):  
A. Bernard Knapp
Keyword(s):  
Bronze Age ◽  
Eastern Mediterranean ◽  
Copper Production ◽  
Late Bronze Age ◽  
Central Mediterranean ◽  
Mediterranean World ◽  
Production Distribution ◽  
The Impact ◽  
The Bronze Age ◽  
Metals Production

New data on Late Bronze Age Cypriot and Aegean material found in the eastern, southern, and central Mediterranean significantly alter timeworn concepts about the scope and extent of Mediterranean trade systems. Recent geochemical and statistical analyses highlight the pivotal role played by the production, distribution, and consumption of copper oxhide ingots in the Bronze Age economies of the wider Mediterranean world. As a consequence, it is possible to propose some basic hypotheses on metallurgical origins, and on the possible orientation of Mediterranean Bronze Age trade and traders.Two basic issues are involved: 1) did increased trade with the eastern Mediterranean stimulate production and intensify exchange mechanisms in the central Mediterranean? 2) or did eastern Mediterranean traders simply plug into an existing politico-economic system that somehow monitored metals' production and exchange further west?This paper also evaluates the impact of new archaeological and metallurgical data on traditional interpretations of Cypriot copper production and exchange in its Late Bronze Age Mediterranean context. Whilst Cypriot copper production remained important to the economy of the Bronze Age Mediterranean, it also made key tactical and commercial adjustments to the coming Age of Iron. Mechanisms of Mediterranean trade are still difficult to pin down, and it is unrealistic to do more than propose basic models of entrepreneurship, ethnicity, and exchange.

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