scholarly journals REMARKS ON THE KARSTIFICATION IN THE WIDER AREA OF THE UPPER MESSINIA CLOSED HYDROGEOLOGICAL BASIN (SW PELOPONNESUS, GREECE)

2017 ◽  
Vol 43 (4) ◽  
pp. 1785 ◽  
Author(s):  
I. Mariolakos ◽  
E. Spyridonos
Keyword(s):  
Water Flow ◽  
Upper Cretaceous ◽  
Fault Zones ◽  
Karstic Aquifer ◽  
The South ◽  
Quaternary Deposits ◽  
The North ◽  
Hydraulic Conditions ◽  
Underground Flow ◽  
Hydrogeological System

The Upper Messinia Basin is part of the Kalamata - Kyparissia graben structure, defined by two fault zones, one of E-W direction to the north and one of N-S direction to the east. The Tripolis and the Pindos alpidic units build up the basement of the region, and are covered by post-alpidic Pleistocene and quaternary deposits. The Basin is a closed hydrogeological system. In the upper cretaceous Pindos limestones, we observe two different karst types, according to drilling results. In the western part of the basin, where the limestones appear on the surface, the merokarst type is observed and water flow is limited in separated karstic conduits. On the contrary, in the central part of the basin, where the limestones underlie the clastic post-alpidic formations, the holokarst type is observed and a rich karstic aquifer is developed. This is explained by the closed hydraulic conditions. In the western part of the basin the karstic aquifer is unconfined, while in the central part it is confined, due to the overlying impermeable post-alpidic sediments and the overall closure of underground flow to the south. It appears that the confined conditions led to the development from merokarst to holokarst in this region.

The Mesozoic-Tertiary evolution of the Aquitaine Basin

1982 ◽  
Vol 305 (1489) ◽  
pp. 63-84 ◽  
Keyword(s):  
Upper Cretaceous ◽  
Oil Fields ◽  
Upper Eocene ◽  
The South ◽  
Gas Field ◽  
Massif Central ◽  
Tectonic Plates ◽  
The North ◽  
Basic Magmatism ◽  
Aquitaine Basin

The Aquitaine Basin, situated in southwest France, with an area of about 60 000 km 2 , has the form of a triangle which opens towards the Atlantic (Bay of Biscay) and is limited to the north by the Hercynian basement of Brittany and the Massif Central, and to the south by the Pyrenean Tertiary orogenic belt. Beneath the Tertiary sequence (2 km thick, and which outcrops over much of the basin) a Mesozoic series, up to 10 km thick, rests generally on a tectonized Hercynian basement but locally it covers narrow (NW-SE-trending) post-orogenic trenches of Stephano-Permian age. The Mesozoic history can be subdivided into four major structural-sedimentary episodes: (1) during a Triassic taphrogenic phase a continental-evaporitic complex developed with associated basic magmatism; (2) throughout the Jurassic, a vast lagoonal platform developed, initially (Lower Lias) as a thick evaporitic sequence followed by a uniform shale-carbonate unit, indicating a relative structural stability; (3) the end of the Jurassic and the Lower Cretaceous saw a fragmentation of this platform, due to an interplay between the Iberian and European tectonic plates, resulting in an ensemble of strongly subsident sub-basins; (4) during the Upper Cretaceous and until the end of the Neogene, the evolution of the Aquitaine Basin was influenced by the Pyrenean orogenic phase, with the development, towards the south, of a trench infilled by flysch which, from the Upper Eocene, is succeeded by a thick post-orogenic molasse complex. The main hydrocarbon objectives in the basin are situated in the Jurassic platform (e.g. the Lacq giant gas field) and the Cretaceous sub-basins (e.g. the Cazaux and Parentis oil fields). To date, production has been about 4 x 10 7 m 3 of oil, and about 15 x 10 10 m 3 of gas since the first gas discovery (St Marcet) in 1939.

Contribution a l'etude tectonique du versant nord du massif de la Lare; les collines d'Encauron et des Lagets

1966 ◽  
Vol S7-VIII (7) ◽  
pp. 938-945
Author(s):  
Jean Aubouin ◽  
Jean Chorowicz ◽  
Nicole Le Dore
Keyword(s):  
Upper Cretaceous ◽  
The South ◽  
The North ◽  
Historical Geology

Abstract The Encauron Jurassic hills are allochthonous on the upper Cretaceous Etienne syncline which borders the Lare anticline on the north. The Lagets hills are autochthonous--relatively--and represent the north flank of the Etienne syncline and the south flank of the Huveaune Triassic belt. Superposed tectonic phases are emphasized, being represented by three successive groups of structures: overthrusts, folds, fractures. After an account of the historical geology, the Encauron hills are compared with the Sainte Baume series.

scholarly journals A Cretaceous dinoflagellate cyst zonation for NE Greenland

2019 ◽  
Vol 157 (10) ◽  
pp. 1658-1692 ◽  
Author(s):  
H. Nøhr-Hansen ◽  
S. Piasecki ◽  
P. Alsen
Keyword(s):  
North Sea ◽  
Lower Cretaceous ◽  
Upper Cretaceous ◽  
Barents Sea ◽  
The South ◽  
Norwegian Sea ◽  
Dinoflagellate Cyst ◽  
The North ◽  
Northern North Sea ◽  
First Time

AbstractA palynostratigraphic zonation is for the first time established for the entire Cretaceous succession in NE Greenland from Traill Ø in the south to Store Koldewey in the north (72–76.5° N). The zonation is based on samples from three cores and more than 100 outcrop sections. The zonation is calibrated to an updated ammonite zonation from the area and to palynozonations from the northern North Sea, Norwegian Sea and Barents Sea areas. The palynozonation is primarily based on dinoflagellate cyst and accessory pollen. The Cretaceous succession is divided into 15 palynozones: seven Lower Cretaceous zones and eight Upper Cretaceous zones. The two lowermost zones are new. The following five (Lower Cretaceous) zones have already been described. Two of the Upper Cretaceous zones are new. The zones have been subdivided into 20 subzones, 11 of which have been described previously and one of which has been revised/redefined. Nine subzones (Upper Cretaceous) are new. More than 100 stratigraphical events representing more than 70 stratigraphic levels have been recognized and presented in an event-stratigraphic scheme.

scholarly journals Functioning of the Primary Aquifer Relating to the Maider Basin, Morocco: Case of the Ordovician aquifer.

2018 ◽  
Vol 37 ◽  
pp. 01001
Author(s):  
E. Ben-said ◽  
A. Boukdir ◽  
A. Mahboub ◽  
A. Younsi ◽  
A. Zitouni ◽  
...  
Keyword(s):  
The South ◽  
General Flow ◽  
The North ◽  
Current State ◽  
State Of Water ◽  
Principal Axes ◽  
Piezometric Surface ◽  
The One ◽  
Underground Flow ◽  
Physicochemical Approach

The basin of Maider is limited northly by the vast ensemble Oriental Saghro-Ougnate, from the east by the Tafilalet plain, from the west by the oriental Jbel Bani, finally from the south and south-east by the Cretaceous Hamada of Kern-Kem. During last decades, groundwater in the basin of Maider, is confronting degradation in both cases: Quantitative and qualitative, as a result of the drought, the overexploitation and the salinization. The aim of this action research is to understand the current state of water resources in the area of stady. At the end of this work, we can get the following conclusions: the general flow of the ordovician aquifer is always directed from the north to the south-east of the basin by following the principal axes of the wadis:Taghbalt, Hssiya and Fezzou. The recharge of the aquifer is primarily done, either by the underground flow, or by the surface runoff of torrential waters from the upstream of Jbel Saghro. The piezometric anomaly noticed at the level of Ait Saàdane, explained by overexploitation linked to the needs of irrigation water. The physicochemical approach for the Maider basin identifies two essential factors of the salinisation of groundwater: the dissolution of the aquifer which is rich in minerals with high temperature on the one hand, and the decrease of the piezometric surface due to the overexploitation and drought on the other hand.

scholarly journals Facies changes in the Cenomanian (Cretaceous) of the northwestern Elbe Valley near Dresden (Saxony, Germany)

2017 ◽  
Vol 67 (1) ◽  
pp. 135-144 ◽  
Author(s):  
Karl-Armin Tröger
Keyword(s):  
Upper Cretaceous ◽  
The South ◽  
The West ◽  
The North ◽  
Near Shore ◽  
Bohemian Cretaceous Basin ◽  
Early Late ◽  
Rich Fauna ◽  
Cretaceous Deposits

Abstract The Upper Cretaceous of the Elbe Valley in Saxony and the erosion outliers west of it mark an Upper Cretaceous NW-SE-running strait between the Westsudetic Island in the NE and the Mid-European Island to the west. This street connected the NW-German-Polish Basin in the north and the Bohemian Cretaceous Basin (and adjacent regions of the Tethys) in the south. However, post-Cretaceous erosion north of Meißen removed any Upper Cretaceous deposits but erosion outliers at Siebenlehn and especially north of the Forest of Tharandt proof the presence of a marly through silty belt in this area. Three transgressions (base of uppermost Lower to Middle Cenomanian, base of Upper Cenomanian and base of the geslinianum Zone in the mid-Upper Cenomanian) have taken place. The sedimentation was influenced by the topography of the mentioned islands and by movements at structural lines in the Proterozoic and Palaeozoic basement. During the early Late Cenomanian, a marly-silty sedimentation (Mobschatz Formation) in the north existed besides sandy sedimentation in the south (Oberhäslich Formation). The transgression at the base of the geslinianum Zone caused the final submergence of island chains between Meißen, Dresden and Pirna, and a litho- and biofacies bound to cliffs and submarine swells formed. A silty-marly lithofacies, a mixed sandy-silty lithofacies (Dölzschen Formation) and a sandy lithofacies in the south (Sächsisches Elbsandsteingebirge) co-existed during the latest Cenomanian. The first mentioned biofacies yields a rich fauna mainly consisting of oysters, pectinids, rudists, and near-shore gastropods accompanied by echinids and, in some cliffs, teeth of sharks. The Pennrich fauna (Häntzschel 1933; Uhlig 1941) especially consists of the very common serpulids Pyrgopolon (P.) septemsulcata and Glomerula lombricus (formerly Hepteris septemsulcata and G. gordialis).

Sur la stratigraphie et la tectonique du groupe du Jebel Musa (Rif septentrional, Maroc)

1963 ◽  
Vol S7-V (1) ◽  
pp. 70-79 ◽  
Author(s):  
Michel Durand Delga ◽  
Michel Villiaumey
Keyword(s):  
Upper Cretaceous ◽  
Upper Triassic ◽  
The South ◽  
The North ◽  
Jurassic Limestone ◽  
North End

Abstract The allochthonous Musa group of upper Triassic shale, Jurassic limestone, dolomite, marl, and radiolarite, and Cretaceous to Paleogene clastics lies upon Senonian (upper Cretaceous) autochthonous marl and shale of the Tangier massif at the north end of the Rif mountains in Morocco. The group more closely resembles the formations of the Gibraltar area than nearby formations to the south in Morocco. The significance of the Beliounis flysch, believed to be of Cretaceous to Oligocene age, is unexplained. It may be a remnant of the cover of the Musa group although presence of other facies of the same age in the area contradicts this possibility.

A geophysical and geotechnical study to determine the hydrological regime of the Central Manitoba gold mine tailings deposit

2009 ◽  
Vol 46 (1) ◽  
pp. 69-80 ◽  
Author(s):  
Barbara L. Sherriff ◽  
Ian J. Ferguson ◽  
Michael W. Gupton ◽  
Jamie F. VanGulck ◽  
Nikolay Sidenko ◽  
...  
Keyword(s):  
Surface Water ◽  
Water Flow ◽  
Hydrological Regime ◽  
Shear Zones ◽  
Discharge Zone ◽  
The South ◽  
Groundwater Movement ◽  
The North ◽  
Surface Water Flow ◽  
Gold Mine Tailings

Extraction of gold from quartz–carbonate shear zones has left a barren deposit of tailings at Central Manitoba mine, which remains unchanged after 70 years. In this study, the shape of the basin, the groundwater and surface water flow regime, and the electrical conductivity of the tailings have been delineated using a combination of geotechnical, geophysical, and geochemical techniques. Groundwater and surface water flow from the north–south-fractured bedrock outwards to the east and west. A component of upward groundwater movement in the deposit is due to evaporation in hot, dry summers, limited recharge from precipitation, and the tailings basin being a local groundwater discharge zone. Electromagnetic surveys indicate that the thickness of the tailings and underlying peat bog material increases from ∼1 m at the south of the tailings to ∼5 m at the north. The surveys provided an effective way of mapping the spatial distribution of acidic pore fluids and associated increased salinity. Zones of acidification, occurring mainly on the south side of the tailings, support the hypothesis that acidification is due to differential settling during the initial discharge of carbonate and sulfide minerals.

The Auk Field, Block 30/16, UK North Sea

1991 ◽  
Vol 14 (1) ◽  
pp. 227-236 ◽  
Author(s):  
Nigel H. Trewin ◽  
Mark G. Bramwell
Keyword(s):  
North Sea ◽  
Lower Cretaceous ◽  
Upper Cretaceous ◽  
The South ◽  
Well Control ◽  
Western Margin ◽  
The North ◽  
Fault Block ◽  
Definition Of ◽  
Central North Sea

AbstractThe Auk field is located in Block 30/16 at the western margin of the Central Graben. Oil is contained in a combination stratigraphic and structural trap which is sealed by Cretaceous chalk and Tertiary claystones. An oil column of up to 400 ft is contained within Rotliegend sandstones, Zechstein dolomites, Lower Cretaceous breccia and Upper Cretaceous chalk. Production has taken place since 1975 with 80% coming from the Zechstein, in which the best reservoir lithology is a vuggy fractured dolomite where porosity is entirely secondary due to the dolomitization process and leaching of evaporites. Both Rotliegend dune slipface sandstones, and the Lower Cretaceous breccia comprising porous Zechstein clasts in a sandy matrix, also contribute to production. Poor seismic definition of the reservoir results in reliance on well control for detailed reservoir definition. The field has an estimated ultimate recovery of 93 MMBBL with 13 MMBBL remaining at the end of 1988.The Auk field is situated in Block 30/16 of the Central North Sea about 270 km ESE from Aberdeen in 240-270 ft of water (Fig. 1). The field covers an area of about 65 km2 and is a combination of tilted horst blocks and stratigraphic traps, located at the western margin of the South West Central Graben. The Auk horst is about 20 km long and 6-8 km wide, with a NNW-SSE trend. It is bounded on the west by a series of faults with throws of up to 1000 ft, and the eastern boundary fault has a throw of 5000 ft in the north reducing to zero in the south (Fig. 2). The horst is a westward tilted fault block in the north which grades into a faulted anticline in the south. The Auk accumulation is largely contained within Zechstein dolomites and is ultimately sealed by Cretaceous chalk which overlies the base Cretaceous erosion surface. An E-W cross-section of the field is illustrated by Fig. 3. Auk was the first of the alphabetical sequence of North Sea sea-bird names used for Shell/ Esso fields.

Etude tectonique de la region sud de la Nerthe

1966 ◽  
Vol S7-VIII (5) ◽  
pp. 712-726 ◽  
Author(s):  
Claude Froget ◽  
Gerard Guieu ◽  
Max Robert Roux
Keyword(s):  
Complex Network ◽  
Upper Cretaceous ◽  
Mediterranean Coast ◽  
Prominent Feature ◽  
The South ◽  
The North ◽  
Major Fault ◽  
Tectonic Study ◽  
And Behavior ◽  
Sketch Map

Abstract Stratigraphic and tectonic study of the southern Nerthe [Mediterranean coast of France] is based on a sketch map at 1:5,000. The most prominent feature of the region is the presence of the middle and upper Cretaceous, which most commonly forms depressions (B) arranged in synclines or eroded and buried anticlines: to the north under the inverted edge of an anticline (A); to the south, under the front of an overthrust (C). The structure and behavior of units (A), (B), and (C) are defined. Units (A) and (C) had a tendency to be displaced in opposite directions, after sinking of the medial unit (B), becoming somewhat mutually overlapped (the Grand-Vallat). The major fault placing these units in contact is transformed toward the Graffian [highlands] into a complex network of fractures gradually connecting with the Triassic axis of the Rove. Relations with adjacent tectonic units are considered (Etoile overthrust, Marseilles basin). A chronology of the different movements is proposed, from the upper Cretaceous to the Miocene, based on a general examination of the folded zone north of Marseilles.

scholarly journals FIRST RECORD OF OSTRACODS IN THE ESTIVA FORMATION (PERNAMBUCO BASIN, UPPER CRETACEOUS), NORTHEAST OF BRAZIL

2021 ◽  
Vol 31 (1) ◽  
pp. 16-26
Author(s):  
Cecília Barros ◽  
Enelise Piovesan ◽  
Mário Lima Filho ◽  
Sonia Agostinho
Keyword(s):  
Literature Review ◽  
Continental Shelf ◽  
Shear Zone ◽  
Upper Cretaceous ◽  
First Record ◽  
The State ◽  
Basin Evolution ◽  
Southern Coast ◽  
The South ◽  
The North

The present work deals with the first record of ostracods in the Estiva Formation, Pernambuco Basin (Cupe, 1 LABIO-PE1 borehole). The Pernambuco Basin extends throughout the southern coast of the state of Pernambuco and is limited by the Pernambuco Shear Zone, in the north and by the Maragogi High, in the south. The Estiva Formation consists of continental shelf carbonates dated as Upper Cretaceous. The analysis and interpretation of the data were performed through literature review, stratigraphic data surveys, and sampling. The methodology used for the treatment of the samples consisted of the following steps: collection, weighing and fragmentation of the samples; washing and drying of the calcined materials; and screening and picking of the carbonatic microfossils. Rare ostracods were found, probably belonging to the brackish genus Fossocytheridea Swain & Brown, 1964. The recognition of the ostracod fauna and its paleoecology aims to contribute to the understanding of the Pernambuco Basin evolution.

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