scholarly journals Variability of imposex development and reproductive alterations in the Patagonian gastropod Buccinanops globulosus inhabiting a polluted harbour area

2014 ◽  
Vol 17 ◽  
pp. 167-171 ◽  
Author(s):  
Mónica Primost ◽  
Andres Averbuj ◽  
Gregorio Bigatti
Keyword(s):  
2021 ◽  
pp. 100107
Author(s):  
Anthony Roy ◽  
Jean-Christophe Olivier ◽  
François Auger ◽  
Bruno Auvity ◽  
Emmanuel Schaeffer ◽  
...  

1997 ◽  
Vol 98 (2) ◽  
pp. 163-167 ◽  
Author(s):  
Hiroya Harino ◽  
Minoru Fukushima ◽  
Yuko Kurokawa ◽  
Shin’ichiro Kawai

2020 ◽  
Vol 2 (1) ◽  
Author(s):  
Germaine Noujaim Clark ◽  
Marcelle Boudagher-Fadel

The biostratigraphy and sedimentology of the outcrops and bedrock recently exposed in archaeological excavations around the harbour area of Beirut (~5 km²) unlock the geological and structural history of that area, which in turn are key to understanding the hydrocarbon and hydrogeological potential of the region. A key location (Site 2) of a studied outcrop section and newly uncovered bedrock is on the northern foothill cliff of East Beirut (Achrafieh). The outcrop section of carbonates is of Eocene beds overlain by conformable Miocene beds. The excavation of the slope bordering the outcrop uncovered a bedrock section of an early Pliocene shoreline of carbonate/siliciclastic sands at its base and topped by a beach-rock structure. The early Pliocene age of the shoreline section is dated by an assemblage of planktonic foraminifera that includes Sphaeroidinellopsis subdehiscens , Sphaeroidinella dehiscens and Orbulina universa . The Eocene carbonates of Site 2 extend the coverage of the previously reported Eocene outcrops in the harbour area. They form a parasequence of thin-bedded, chalky white limestones that includes the youngest fossil fish deposits in Lebanon ( Bregmaceros filamentosus ). The deposits are dated as early Priabonian by their association with the planktonic foraminiferal assemblage of Porticulasphaera tropicalis , Globigerinatheka barri , Dentoglobigerina venezuelana , Globigerina praebulloides , Turborotalia centralis and Borelis sp. The Middle Miocene carbonates that conformably overlie the early Priabonian, parasequence include a planktonic foraminiferal assemblage of Globigerinoides trilobus , Orbulina universa and Borelis melo . Elsewhere, in the harbour area, the preserved Eocene limestones are also overlain by conformable Miocene carbonate parasequences of Langhian–Serravallian age. Younger argillaceous limestone beds of the Mio/Pliocene age occur in the eastern central part of the harbour area and enclose an assemblage of Truncorotalia crassaformis , Globorotalia inflata and Orbulina universa . The three markers of old and recently raised structural blocks in the harbour area are a Lutetian/Bartonian marine terrace in the south west corner, a lower Pliocene shoreline carbonate section in the north east side and a Holocene raised beach of marine conglomerates in the north east corner of the area. The locations of these paleo-shorelines, less than 2 km apart, indicate a progressive platform narrowing of North Beirut since the Paleogene. This study underpins the geological complexity of the region and contributes to understanding the underlying geology, which will be needed for future regional archaeological, hydrocarbon and hydrogeological exploration.


Author(s):  
Luca Iocchi ◽  
Luca Novelli ◽  
Luigi Tombolini ◽  
Michele Vianello

Artificial vision techniques derived from computer vision and autonomous robotic systems have been successfully employed for river traffic monitoring and management. For this purpose, ARGOS and HYDRA systems have been developed by Achimedes Logica in collaboration with Sapienza University of Rome under the EU initiatives URBAN and MOBILIS for the monitoring of the boat traffic in Venice on the Gran Canal and the harbour area. These advanced systems provide an efficient automatic traffic monitoring to guarantee navigation safety and regular flow while producing and distributing information about the traffic. The systems are based on the processing of digital images that are gathered by survey cell stations distributed throughout the supervised area providing a visual platform on which the system displays recent and live traffic conditions in a synthetic way similar to radar view. ARGOS and HYDRA systems are programmed to automatically recognize and notice situations of great interest in whatever sea or land-targeted security applications including environmental, perimeter, and security control. This article describes the wide spectrum of applications of these two systems, that is, monitoring traffic and automatically tracking position, speed and direction of all vehicles.


1973 ◽  
Vol 10 (9) ◽  
pp. 1363-1379 ◽  
Author(s):  
D. F. Strong ◽  
J. G. Payne

In the Moretons Harbour area, at the eastern end of the Lushs Bight terrane of central Newfoundland, the volcanic rocks of the "Lushs Bight Supergroup" are divided into two new groups, viz, the Moretons Harbour Group and the Chanceport Group. The former is separable into four formations, consisting primarily of variable proportions of basaltic pillow lavas and volcanoclastic sediments, with a composite thickness in excess of 6 km, or around 8 km including an extensive area of 'sheeted' diabase dikes. These formations are steeply dipping and face southwest; they are separated by the Chanceport fault from the Chanceport Group to the south. The latter consists of interbedded basaltic pillow lavas with graywackes and banded red and green cherts, all facing north and steeply dipping to overturned, with a composite thickness of approximately 3 km.The Moretons Harbour Group has been intruded by the Twillingate trondhjemitic granite–granodiorite pluton and abundant basic dikes intrude the granite, indicating that the mafic and felsic magmatism were coeval. Both have undergone intense deformation and the volcanics show a change from greenschist to amphibolite facies mineralogy within a distance of 2 km on approaching the pluton, a result of buttressing by the pluton during deformation, and not an intrusive effect.Base metal sulfides are common throughout the area, but the main occurrences of Cu, As, Sb, and Au are concentrated in the Little Harbour Formation, a 2600 m thick sequence of volcanoclastic rocks within the Moretons Harbour Group.The great thickness of volcanic rocks is interpreted as having formed in an island arc environment, although it is possible that the lowermost parts of the sequence represent oceanic crust. It is unlikely that the sheeted diabases of the Moretons Harbour area were produced by sea-floor spreading.


1994 ◽  
Vol 31 (3) ◽  
pp. 583-596 ◽  
Author(s):  
David Corrigan ◽  
Nicholas G. Culshaw ◽  
Jim K. Mortensen

The Parautochthonous Belt in the region of Key Harbour, Ontario, is composed of Early Proterozoic migmatitic para- and orthogneiss and Mid-Proterozoic granitoids, which were reworked during the Grenville orogeny. Grenvillian deformation is localized into anastomosing arrays of high-strain shear zones enclosing elongate bands and lozenges of rock subjected to lower and near-coaxial strain. Crosscutting relationships preserved in the low-strain domains document two pre-Grenvillian plutonic and tectonometamorphic events, which are bracketed in age by U–Pb zircon geochronology. A 1694 Ma leucogranite intrudes, and provides a minimum age for, high metamorphic grade gneisses formed during an earlier tectonometamorphic event (D1–M1). The leucogranite was intruded by mafic dykes, deformed, and metamorphosed at uppermost amphibolite facies during D2–M2, before the emplacement of Mid-Proterozoic granitoids at ca. 1450 Ma. Following the emplacement of gabbro dykes and pods at ca. 1238 Ma, the area was overprinted by granulite to uppermost amphibolite facies metamorphism (Grenvillian), for which monazites provide a minimum age of ca. 1035 Ma. Titanite U–Pb ages of 1003 – 1004 Ma record cooling through 600 °C. A regionally important swarm of east–west-trending posttectonic pegmatite dykes dated by U–Pb zircon at 990 Ma provides a minimum age for Grenvillian ductile deformation. The present data support the contention that the Parautochthonous Belt in the Key Harbour area consists in part of reworked midcontinental crust of Early to Mid-Proterozoic age.


1976 ◽  
Vol 3 (2) ◽  
pp. 123-129 ◽  
Author(s):  
Lawrence K. Wang ◽  
Richard P. Leonard

Dredging operations are often needed for the improvement of a channel and/or harbour area. Unavoidably the water resources close to the dredging site will be contaminated to some degree. This paper initially presents the main feature and operation methods of new-work dredging and of maintenance dredging. The former comprises the improvement (i.e. deepening or widening) of a channel and/or harbour area mainly by removing stones and compacted sediments which were deposited through geologic ages. The latter is employed mainly to remove the loose sediments which tend to fill up previously excavated channels and harbours. The clamshell dredge, the dipper dredge, the pipeline dredge, and the hopper dredge, are four common types of dredges that are used for river and harbour excavation by the U.S. Army Corps of Engineers. Their functions, operations, and cost data, are indicated.In general only the sediments excavated from maintenance dredging operations are polluted with obnoxious or toxic contaminants that are detrimental to the land, air, and water, environment. The sources of pollution that are associated with the channel and harbour sediments may be categorized as being from municipal and industrial discharge, storm-runoff, agricultural runoff, soil erosion, and accidental spills.Typical dredged materials from Ashtabula and Fairport Harbors in Ohio were collected and analyzed for investigation. It was found that the sediments varied widely, in their physical and chemical characteristics, between harbours and even at different locations within each harbour. Nevertheless, the pollutants in the dredged materials of a specific harbour (or channel) can be generally characterized. Settleability of the dredging samples was investigated in detail. It was observed that oil and grease and heavy-metals were intimately associated with sediments and could be removed with settlement of solids.The current dredging practices in the U.S.A. includes the disposal of dredged materials in open sea, open lake, along-shore diked areas, off-shore diked areas, abandoned strip-mine areas, and other disposal sites. Due to the excellent settleability of the dredged materials, it is desirable that the polluted dredgings be stored on a disposal site for some time prior to any treatment. A disposal area can be used to create new land if satisfactory fill is produced. The satisfactory fill can be the non-polluted dredged materials from the new-work dredging operations, or well-treated sediments from maintenance dredging operations. The treated sediments or particles should be free from oil and grease, from toxic heavy-metals, and from any substances which are putrescent, deleterious, or odorous. They should not cause any organic decomposition or ground-water contamination.The dredged materials can be separated into the sediment and the supernatant water (i.e., spoil) by settling. From the dredging-settling data presented in this paper, it appears that sufficient settling of dredging in a diked disposal area, followed by discharge of supernatant to Great Lakes water, will not contravene the proposed Great Lakes Water Standards, and so the goal of water resources conservation could be achieved.


Sign in / Sign up

Export Citation Format

Share Document