1,721,205 research outputs found
Working-Class Ecology and Union Politics: A Conceptual Topology
No full textThis article argues that Environmental Labour Studies (ELS) may largely benefit from incorporating the perspective of Environmental Justice (EJ). It will do so by offering a theorization of working-class ecology as the place where working-class communities live and work, and that are typically affected by environmental injustice, and of working-class environmentalism as those forms of mobilization that link labour and environmental struggles around the primacy of reproduction. This theorization will thus be connected to a social ethnography of working-class environmentalism in the case of Taranto, a monoindustrial town in southern Italy, which is suffering from a combination of environmental and public health crisis. After characterizing the historical process by which Taranto’s working-class ecology has been produced, we show how EJ mobilizations since the early 2000s have allowed the re-framing of union politics along new ways of politicizing the economy. We conclude by offering a conceptual topology of working-class ecology, which situates different labour organizations (confederal, social/community, and rank-and-file unions) according to their positioning in respect to EJ
Analisi di facies e stratigrafia della successione permo?-triassica di Campumari-Coremò (Iglesiente, Sardegna SW)
No full textThe Campumari-Coremò succession, at least 50 m thick, starts
with the «Rio Is Corras Formation», a lithostratigraphic unit consisting
of alternations of conglomerates and dolomites and rare sandstones
with caliches, reddish siltites and argillaceous siltites. These
deposits are transgressive and discordant over the folded Hercynian
basement, which is irregularly cut by erosion channels. The lithotypes
described show abrupt lateral facies changes. The abundance
of the carbonate sediments increases towards the south, thus suggesting
the provenance direction of the transgressive sediments. Sediment
deposition probably occurred in variable environments, ranging
alternatively from alluvial fan-delta to restricted carbonate
(lagoonal?-coastal?) lake, with frequent emersions related to fluctuations
of the base level. The consequent oscillation of the water table
may be one of the possible causes of dolomitization and calcretization
of carbonate sediments, together with variations of temperature
and salinity under a dry-hot climate with sporadic hard rainfall episodes.
In some of the calcretes, Characeae remains have been found,
testifying to the former subaqueous (brackish?) depositional environment
of the calcretized sediments. In its lower part, the Riu Is
Corras Formation is also crossed by thin veins containing barite and
sulfides. These features, together with sedimentological characters
and facies analogues, suggest an age older than previously supposed
and connected with the late-post Hercynian (Permian) hydrothermal
circulation.
The Rio Is Corras Formation shows a maximum thickness of
23-24 m at the west side of the Riu Is Corras valley: it can be dated
as Permo?-Triassic, but its age cannot yet be better defined.
Upwards, the carbonate-bearing «Campumari Fm.» follows after
an unconformity. The «Campumari Formation» begins with the «Su
Passu Malu Member», consisting initially of thin marly-clayey greenish
sediments, locally rich in plant debris and containing an Upper
Anisian (Pelsonian/Illyrian) palynomorph association. A thin horizon
of dark, fetid dolostones rich in former sulfate nodules with chickenwire
structure follows and is abruptly overlain by a succession consisting
of about 15 m of yellowish, finely stratified, marly dolostones
to dolostones, also rich in sulfate pseudomorphs with chert nodules.
The main feature of the latter deposit is the gradually increased folding
towards the top, caused probably by diagenetic deformation of
the evaporite layers. Close to the upper boundary of the laminated
dolomites, the folded structures pass to chaotic breccias, some of
which appear very similar to typical «tepee» deposits. Mud-cracks
and ripple marks have also been locally observed.
The «Su Grifoneddu de S’Acqua Member» is the last member of
the Campumari Fm. It starts with a thick collapse breccia made of
angular clasts of dark limestone embedded in a carbonate matrix,
locally containing pseudomorphs after sulfates. These breccias are
overlain by grey dolostones, at first thick but subsequently well-stratified.
Some horizons are characterized by pseudomorphs either
after either gypsum or anhydrite, while others contain unclassifiable
bioclasts and are bioturbated, this occurring mostly at the top of the
dolomitic succession.
The Campumari Fm. is transgressive over a substrate constituted
by the Is Corras Formation: at Su Grifoneddu de S’Acqua it
has a maximum thickness of 26 m. This formation was deposited
initially in an ephemeral, low-energy, reducing lagoon with local
clastic supply, that quickly evolved first to a restricted, frequently
hypersaline carbonate environment (with subordinated sabkha episodes),
and later to a carbonate platform environment fluctuating
from strongly to weakly hypersaline.
Both the absence of continuous, major barriers and the lack of
significant slump deposits, as well as the gradual passage from shallow
to deeper deposits, point to a ramp depositional model. In more
detail, the Campumari-Coremò succession can have been deposited
in a carbonate ramp environment, passing from a lagoonal substage,
with restricted episodes at the beginning, to an inner ramp and then
to shallow ramp subenvironments
Frammentazione della Pangea ed apertura della Tetide alpina nei cicli sedimentari triassico-giurassici della Sardegna centrale (area dei Tacchi)
No full textStratigrafia, analisi di facies ed architettura deposizionale della successione permiana di Guardia Pisano (Sulcis, Sardegna SW)
No full textA detailed stratigraphic and facies analysis has been carried out
on the Guardia Pisano sedimentary succession (BARCA et alii, 1992;
PITTAU et alii, 2002), the most complete Permian section cropping
out in SW Sardinia. This succession has been subdivided into three
lithostratigraphic units. The lower unit (approximately 14.46 m) is
formed by laminated, grey to blackish pelites and rare fine sandstones
containing both acidic volcanic intercalations (lavas and
pyroclastics) and epiclastites deriving from the erosion of volcanic products. Here, siltitic-clayey horizons containing a rich pollen
assemblage suggesting an Asselian age (Lower Permian) has been
found (PITTAU et alii, 2002). The depositional environment of this
unit was a palustrine to alluvial plain (meandering stream) under
probably humid climatic conditions, characterized by a certain
degree of tectono-magmatic activity. The intermediate unit (approximately
59 m) is built up by reddish siltites and clayey siltites containing
subordinate intercalations of micaceous sandstones and rare
conglomerates: the high content of micas and K-feldspars of these
sandstones is probably due to the erosion of former volcanites. This
unit was laid down into a meandering stream environment under
conditions of regular rainfall. The upper unit (approximately 45.8 m)
is constituted by rapid alternations of reddish pelites and sandstones
with sheet-like and lens-shaped conglomeratic-sandstone intercalations,
deposited into a meandering environment under more pronounced
subarid conditions with irregular, catastrophic rainfall
episodes: several crevasse splays have also been recognized here.
These last two units are referable to the «New Red Sandstone»
informal unit, showing a red beds facies, and having a sub-continental
aspect in the frame of the Permian of Europe. The sedimentological
features evidenced suggest a gradual evolution from (warm?)
humid to subarid climates during the time of deposition of the succession.
The volcanism, aged 297±5 Ma (PITTAU et alii, 2002), pertinent
to the lower unit, post-orogenic in type, has been linked to the
first opening stages of this Permian basin.
Thanks to its extremely good exposure, the succession described,
especially the part pertaining to the «New Red Sandstone», has been
analysed and subdivided into channelized and overbank elements,
using the MIALL’s (1985, 1996) «Depositional Architecture» criteria,
so obtaining a clearer understanding of the palaeoenvironments and
their evolution
Il bacino paleogenico del Sulcis-Iglesiente (Sardegna SW): nuovi dati stratigrafico-strutturali per un modello geodinamico nell'ambito dell'orogenesi pirenaica
No full textNew stratigraphic and sedimentological investigations on the Middle Eocene–Early Miocene continental successions in southwestern Sardinia (Italy): Paleogeographic and geodynamic implications
No full textAbstract
In SW Sardinia, the continental Tertiary successions referred up to now to the Cixerri Fm. (Middle Eocene–Lower Oligocene?) have been investigated. Sedimentological analysis suggests these deposits lied down in fluvial environments and comprised between distal braided streams passing eastward to meandering streams/coastal environments (?) under sub-arid climates. The scrutinization of the Cixerri Fm. westernmost successions allowed one to split locally the upper from the lower part based on sedimentological and mineralogical features and indirect dating. Unfortunately, this separation cannot be set everywhere. The few upper outcrops plainly evidenced and well-constrained have been newly named Flumentepido Fm. and assigned to Late Oligocene–Early Miocene: they figure out alluvial fans and proximal braided rivers. This way, the SW Sardinia Tertiary continental sedimentation extends its persistence, contemporaneously changing its tectostratigraphic meaning: from a molassoid c..
The "Germanic" Triassic of Sardinia (Italy): A stratigraphic, depositional and palaeogeographic review
No full textThe collection of new lithostratigraphical and sedimentological data has allowed to re-examine the Triassic sedimentation cycle in Sardinia The most important outcrops have been revisited and their general setting reinterpreted. A detailed and homogeneous depositional, palaeoenvironmental and stratigraphic picture is proposed, pointing to the analogies with both the typical Germanic Triassic of Central Europe, and the Middle Triassic Sephardic domain of Western Europe and North Africa.
The lower, essentially siliciclastic, lithostratigraphic units, resting discordantly on the Hercynian Palaeozoic basement, resemble the "Buntsandstein" facies association. They are generally of Anisian age. Their depositional environments range from high-energy continental to transitional environments to the floodplain, where a shallow, epicontinental sea gradually transgressed.
Overlaying these are the carbonate units of the "Muschelkalk" facies association. They are generally dolomitic at the bottom passing to calcareous at the top. These deposits, generally of Ladinian age, formed in the various subenvironments of a carbonate ramp.
The few Upper Triassic successions in Sardinia point to the existence, during this period, of diverse depositional conditions in the North (Nurra) and South (Sulcis) of the island. In southern Sardinia, lagoon to shallow sea carbonate shelf deposition predominates, with minor amounts of evaporites and siliciclastics. By contrast, in Northern Sardinia mixed evaporitic-siliciclastic-carbonate facies of paralic-continental (mudflat), locally restricted lagoonal environments, were deposited. The latter are very similar to the classic Germanic "Keuper" facies. These data suggest that the Upper Triassic successions in Southern Sardinia can be set in a transitional environmental context between the open Alpine-Tethyan domain and the Germanic Triassic proper.
An attempt has been made to correlate these successions with the Middle to Late Triassic eustatic cycles
Stratigrafia ed analisi di facies dei depositi permiani del Lago Mulargia ( Sardegna sud-orientale):primi risultati
No full textIn this paper preliminary results of investigations on the stratigraphic succession of the Permian
Mulargia Lake basin are here described. This succession, from 350 to 400 m thick, has been first time subdivided
into 4 stratigraphic units, and respectively, from the bottom: a “Lower siliciclastic Unit”, a “Volcano-sedimentary
Unit”, an “Upper siliciclastic Unit”, and a “Volcanic Unit”. The depositional frame of this succession is
inferred as a network of alluvial facies of various energy degrees, comprised between the palustrine, the fluvial
and the lacustrine environments. These facies are located into a continental molassic basin, progressively spreading
out during the post-collisional extensional Variscan tectonic phase, and characterized, during its evolution,
by two different volcanic activity cycles
Compressive "Alpine" Tectonics in Western Sardinia: Geodynamic Consequences
No full textNew detailed stratigraphical and structural surveys on Mesozoic and Cenozoic outcrops, particularly
of Southwestern Sardinia, point out the presence of strong compressive (with folding and thrusting
phenomena) “Alpine” tectonics, closely connected with the development of the (Laramic)-Pyrenean
Chain. The new data allows us to hypothesize a different interpretation for the tectonesedimentary
and magmatic evolution of the Sardinian Late Mesozoic-Paleogenic basins, considered in the
evolutional Western Mediterranean context
Stratigrafia, analisi di facies, paleogeografia ed inquadramento regionale del Giurassico dell'area dei Tacchi (Sardegna centro-orientale)
No full textNew investigations carried on the Jurassic successions of the
Tacchi area (Eastern Sardinia) have given a more detailed knowledge
of the local stratigraphy and sedimentology. Geological mapping
and litho-sedimentological analysis heve provided a detailed
framework for the vertical and areal development and evolution of
the sedimentary facies, and also allowed an accurate paleogeographical
construction. The Genna Selole Fm. (Bajocian-Bathonian)
(DIENI et alii, 1983), constituting the base of the Tacchi Jurassic succession,
is built of siliciclastic to mixed, siliciclastic-carbonate,
deposits. It was laid down in depositional environments ranging
from distal alluvial fan to transitional lagoonal-littoral. In places the
Genna Selole is absent and so the marine Dorgali Dolostones Fm.
(Bathonian-Kimmeridgian) (DIENI et alii, 1983), directly overlies the
folded Paleozoic basement. The omission of the Genna Selole Fm.
suggests the presence of uplifted areas of erosion and alteration
whose location has been controlled by structural, syn-depositional
factors, as a possible Variscan paleo-high. Based on new evidence,
the Genna Selole Fm. has been subdivided into three lithofacies: A) a
conglomeratic lithofacies (Laconi-Gadoni Lithofacies); B) a sandyclayey
lithofacies (Nurri-Escalaplano Lithofacies); and a mixed siliciclastic-
carbonate lithofacies (Ussassai-Perdasdefogu Lithofacies),
this latter constituting the gradual passage to the following Dorgali
Dolostones Fm. In addition, features observed in the Genna Selole
Fm. (slumps, synsedimentary faults, neptunian dykes, seismic breccias)
suggest active coeval extensional tectonics. The thickness of the
Genna Selole Fm. is between 0 and 50 m. We propose two others
additional parastratotypes for this formation in the Escalaplano and
Perdasdefogu areas, characterized by good continuity and exposure,
and so integrating the stratotype described by DIENI et alii (1983).
The comprehensive analysis of the Genna Selole Fm. isopachs and of
its lithofacies in the Tacchi area evidences the presence, and the subsequent
gradual burial and flooding, of a morpho-structural high («alto morfostrutturale barbaricino») developed in Central Sardinia,
due to the coeval extensional tectonics prevailing during the Lower
and Middle Jurassic. The upper Dorgali Dolostones Fm., up to 250-
300 m thick, is characterized by different lithofacies all referable to
inter- to subtidal environments of a carbonate shelf (stromatolitic
mounds, lagoonal sediments, storm layers, flaser bedding, herringbone
cross stratification, oolitic shoals and bars, possible internal
breccias of tectonic origin), extending between the carbonate lagoon
and the platform break. The most widespread deposits are irregular
alternations of calcarenitic storm layers and bioturbated mudstones.
In the easternmost areas (Tacchi of Seui, Ulassai and Tertenia-
Jerzu), 300 m of the Dorgali Dolostones Fm. are overlain abruptly by
little, previously unknown, calcareous outcrops, having a maximum
thickness of 40 m, referable to the M. Tului and M. Bardia Fms
(AMADESI et alii, 1960). These are formed by oolitic calcarenites,
oolitic-bioclastic calcirudites-calcarenites, coralline framestones,
subordinated calcilutites and possible accumulations of fore-reef
breccias. The presence of Ellipsactinia suggests an Upper Jurassic
age. The depositional environments of the Monte Bardia and Monte
Tului Fms. could be referred to platform margin areas where oolitic
bars and limited bioconstructions (patch-reef) developed. Based on
the described data, and taking in account the low protecting bioconstruction
belt, the whole sedimentation environment can be referred
to a shelf with ramp configuration. The overall depositional framework
of the Jurassic succession can be related to a progressively
deepening transgressive sequence, maybe correlatable with the
extensional tectonics causing the development of the Tethys sea.
Finally, an attempt has been made to hypotesize a regional framework
of the Tacchi area both within the Sardinian Mesozoic successions,
and in the Tethyan context
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