![]() |
dsquared |
gucci |
![]() |
hermes |
![]() |
louis vuitton |
![]() |
louis vuitton |
chloè |
![]() |
chloè |
![]() |
cable |
![]() |
zara |
![]() |
top shop |
![]() |
dsquared |
gucci |
![]() |
hermes |
![]() |
louis vuitton |
![]() |
louis vuitton |
chloè |
![]() |
chloè |
![]() |
cable |
![]() |
zara |
![]() |
top shop |
Summary: The Tremiti recall every year thousands of tourists from around the world. The wonders seen, admired and photographed every day are nothing more than the effect of the course of nature over millions of years. Tourist experience comes a detailed study of the formation and history of the archipelago from a geological point of view and lithology. A tourist route with a high scientific content.
(1) Geologist GeoResearch Center of Italy - geoblog (website: http://www.geobalocchi.blogspot.com/ ) (2) Survey e collaboratore del GeoResearch Center Italy - GeoBlog (sito internet: http://www.ricercasperimentale.blogspot.com/ ).
Introduzione
L'Arcipelago delle Tremiti è costituito da tre isole più grandi (San Domino, San Nicola, Caprara), da un isolotto più piccolo (Cretaccio) e da un'ulteriore small island moved eastward about 10 miles (20 kilometers), called Pianosa. The archipelago is located north of the Gargano Peninsula and 12 miles (22 kilometers) off the coast of Molise.
It is therefore small islands (two square kilometers the largest island of San Domino) easily walkable and circumnavigation in two hours using small boats.
aspects
lithological succession is characterized by outcrops of marine sedimentary lithologies ranging in age from the Paleocene and the Pliocene followed on average, in angular unconformity (Unconformity angular), a succession of continental clastic Pleistocene Upper-Middle (Fig. 1).
The marine succession is mainly represented by a series limestone, dolomitic limestone and limestone-marl passing up a series of lists and the open sea with flint nodules, to close with neritic environment of the calcarenites . From bottom to top, are the following distinct lithological units (SELL, 1971, Channell, 1979; Brozzetti, 2006): Formation of the Bue Marino (dolomite and limestone and calcarenites bioconstructions organogenic neritic environment; Paleocene upper), Training Caprara (compact dolomite with chert nodules and lists of the pelagic environment; Eocene) Formation of San Domino (including a number of lithofacies Low water: organogenic limestones and calcarenites in nummulites bioconstructions; lower-middle Eocene) Formation of Cretaccio (dolomitic limestone and marl glauconitiche yellow, yellow-whitish, the environment variable from coast to open sea; Langhian-Messinian pp), Training San Nicola (dolomitic limestone in the formation of angular unconformity Cretaccio organogenic limestone and the roof of sea bass and richly bioclastic, pp Messinian, middle Pliocene) (Fig. 2).
The continental deposits (Ram, 1989; Brozzetti, 2006), rarely surfacing in complete sequence, are characterized by underlying calcareous conglomerates (Middle Pleistocene), followed by a few meters of limestone Marly (Middle Pleistocene), and a succession of sandy-silty deposits of wind (Loess and Loess Red Yellow Middle Pleistocene-sup., of the Upper Pleistocene Loess Bruno.) sporadic intercalations containing gravel. Finally, resulting from the decalcification of the typical loess "croutons" interleaved at several levels within the continental succession.
NO
Along the coast of the island of San Nicola is visible in the contact between the formation of angular unconformity and the overlying formation Cretaccio San Nicola (Fig. 5). Note the large fold that deforms the Formation of Cretaccio and normal faults that cut both formations.
Other structures are visible at the Grotta del Bue Marino (fig. 6 and 7) where you can see both the stratigraphic dip SE, has many faults.
An interesting structure is the "presumed fault probably active" localized outcropping in the upper part of the island of San Nicola (Fig. 8). Rejection (moving two blocks) and probably represents a transcurrent movement left, highlighted by the step that has formed between the two blocs. In fact, in the non-activity of the fault (fault stops and not moving), the erosion would have even without the two blocks show the step (Panizzi, 1995; Panizzi, 1988).
From a geomorphological point of view of geography and morphology of coastal tourism is the one that attracts the visitor, becoming the predominant element of the landscape.
This morphology may be contained in three main morphotypes:
may be separated if the escarpment cliffs lives is in direct contact with the sea and subject to the processes of marine erosion (Fig. 5 and 9). When the foot of the slope sediments accumulate (of different nature: sandy shoreline, slope debris, landslides) that separate from the sea and thus the erosion of the waves does not change its shape, it is called dead cliff (Fig. 11).
Other characteristic forms of the islands are represented by numerous coves along the coast to form small coves called "set" (Cala del Bue Marino, fig. 6 and 7, Cala of Moray fig. 13, the English Cala, Cala of the Swallows, etc.).. Associated with them are the numerous caves of karst coasts located mostly along the coasts of the island of San Domino.
La Grotta del Bue Marino (fig. 6 and 7) is a hollow dome-shaped rounded and slightly elongated in the direction NE-SW. The entrance to the sea is narrow and low. La Grotta delle Viole (Fig. 14) appears as a round shape with a cavity opening to the sea and of rectangular shape (the shape of the opening is influenced by stratification), while the terminal portion of the cave opens up , showing the sky (well, cave, fig. 14 and 15).
The genesis of the caves (Castiglione, 1978; Panizzi, 1995) of San Domino is related to the dissolution of carbonate rocks by rain water that alter the lithologies on the surface topography and the sea water attacks from below. As a result loosely formed cavities within the rock si allargano formando, inizialmente, una piccola grotta generalmente a forma di cupola e invasa dalle acque marine (a testimonianza che il carsismo procede dal basso, per maggiore alterazione chimica da parte dell’acqua del mare). L’assottigliamento della volta, in tempi successivi, provoca il suo collasso per gravità formando un’apertura verso l’alto. I detriti che si depositano all’interno del piccolo bacino possono essere successivamente allontanati per effetto del trasporto da parte del moto ondoso.
La diversità tra le grotte lungo la costa NO e quelle lungo la costa SE di San Domino è legata alla struttura monoclinalica dell’isola (rilievo a cuesta; PANIZZA, 1995). Infatti a SE le coste sono basse e i processi di dissoluzione con maggiore facilità possono formare delle grotte a pozzo con la volta collassata, mentre lungo le coste alte a NO, la successiole stratigrafica presenta uno spessore maggiore e quindi più resistente ai processi di alterazione permettendo il formarsi di grotte a cupola (in prossimità del mare) e non a pozzo con il succesivo collasso della volta.
number of slope deposits cover the costs or NO on the island of San Nicola. A landslide of considerable rotational sliding scale and probably active, is located along the NE (Fig. 16) with the detachment of some blocks highlighted by the opening of fractures and their respect for lowering the ground level, while at the bottom of the scree slope is visible at different grain sizes. A landslide along the coast to overturn NO (Fig. 11) shows a block rotated slightly to the north and the base of the slope you see a thick blanket of debris.
Bibliography
AA.VV; Tremiti, geology. Available at Internet: http://tremiti.planetek.it/6g/6g.htm .
AA.VV; Tremiti, geomorphology . Available at Internet: http://tremiti.planetek.it/6g/6g_m.htm .
AA.VV; portal Tremiti . viewed on the internet: http://www.lecinqueisole.it/ .
Brozzetti F., D. D'AMATO, PEACE B. (2006); complex structures Neogene nell'avampaese Adriatic: new structural data from Tremiti. Rend. Geol Soc lt, 2, New Series, pp., 94-97.
CASATI P. (1985); Sciences of the earth. Elements of Geology General . Clued Publishing.
CASTIGLIONI GB (1978); Geomorphology. UTET Edizioni, Torino.
Channell JET, D'Argenio B., HORVATH F. (1979); Adria, the African promontory, in Mesozoic Mediterranean paleogeography . Earth. Rev. Sci, 15.
MONTONE P., R. Funiciello (1971); elements tectonics Tremiti Islands (Puglia). Rend. Lt Geol Soc, 12, pp. 7-12.
PANIZZA M. (1995); Geomorphology. Pitagora Editrice, Bologna.
PANIZZA M. (1988): Applied Geomorphology . Italy Nuova Editrice Scientifica, Rome. SADDLE
R. (1971); Islands Quakes and Pianosa . Notes to the Geological Map of Italy, F. 156 S. Marco in Lamis, pp. 49-65.
Paul
Toys
Summary: Through the collection and processing of the elevation of the micro-card natural the exposure of the slope Charter, the Charter the inclination of the slope and DEM (Digital Elevation Model) has been possible to define the structure and elevation of morfostrutura recognize some forms due to the natural pattern of the slopes. The detection geological and structural correspondence of some outcrops near the pyramid morfostruttura showed how the morphology is controlled by both faults, and folds (stratigraphic structures plicate), as is found by two outcrops, the first placed on the side in north and the other on top of which houses the morfostruttura stratification.
Introduction
morfostruttura The pyramidal Vesallo (Carpiteti, Reggio Emilia) is described by some authors ( ROMANO, 2009a; Corrado, 2009) as a form of man-made due to the remodeling of the slope from Part of populations old and lived in surrounding areas prior to the Etruscans. A previous study, describing them instead as a phenomenon linked to natural processes of erosion and selective chemical alteration along the main tectonic ( TOYS, 2010th ). More Italian pyramid morfostrutture southern Apennines are also described as a phenomenon of anthropogenic origin (ROMANO , 2009b; Barbadoro ), have been the subject of a recent study macroscopic, where they analyzed the morphology and geological structures through the analysis Photo satellite Google map ( TOYS, 2010b). The study proposes a "model denudazionale" straight for recession con variazione dell’inclinazione del versante ( BRANCACCIO e al., 1978; ) come modello genetico delle morfostrutture piramidali, che con tutta probabilità può essere esteso anche ad altri siti.
Tale studio ha come obiettivo quello di valutare il modello morfogenetico precedentemente descritto da BALOCCHI (2010a; 2010b ) e completarlo con i dati di campagna relativi allo studio dell’assetto altimetrico e delle principali strutture tettoniche.
Il rilevamento dell’assetto altimetrico con la realizzazione di carte tematiche ( Carta del microrilievo naturale , Carta dell’esposizione del versante , Carta dell’inclinazione del side, DEM) in order to describe the surface Circulation space topography and the main forms of the landscape.
The geological survey of the main structural-tectonic structures describe the structural setting of the area and any correspondence with the morfostruttura, confirming the hypothesis on the morphology control by tectonic structures.
Geological
The area under study from the geological point of view falls within the syncline Vetto-Carpineti ( Papania et al., 1987, De Nardi and al. 1991) and is characterized lithologically formations belonging to the Succession Epiligure (Bettelli and al. 1987) described below:
Ranzano formation (Fig. 1 and 2) is characterized by turbiditic origin of sedimentary bodies with lenticular to tabular geometry and depositional facies vary widely, from conglomerate to sandstone, arenaceous-pelitic and pelitic ( MARTELLI et al., 1998, and Papania al. 2002).
The lower contact of the training is mostly with the formation of the Marne di Monte Plan and is marked by the emergence of well-Arenac net levels, which are absent in the upper part of the formation underlying the formation of locally Ranzano can also support the underlying Ligurian units deformed. Often the contact with the Monte Piano Marl is discordant with a clear gap erosion ( Papania et al., 2002 ).
The contact with the perforation of the overlying marl Antognola is sharp and angular unconformity with a gap in biostratigraphy ( Fornaciari, 1982; Fregni & SANDWICHES, 1987, De Nardi and al. 1991).
The origin of the training environment of turbidite slope and basin with intercalations of submarine landslides. Age: Upper Eocene. - Lower Oligocene. (Priamboniano sup. - Rupel sup.). Formation of
Ranzano was divided into different States ( HAMMER et al., 1998; Papania et al., 2002 ) among which describes those represented in the study area (Fig. 1 and fig. 2):
Training Plan of Marne di Monte (Fig. 1 and 2) consists of clayey marls and marly clays in thin layers and thin, bearing thin and lenticular whitish feldspathic sandstones of graded and rolled, lithologically similar to those that constitute the formation Loiano. The environment is attributable to the continental slope and deep basin, with sedimentation emipelagica order interspersed with turbidite deposits under distal. Age: Middle Eocene - Eocene sup. (Lutetian - Priamboniano) ( Papania et al., 2002 ).
Loiano Formation (Fig. 1 and 2) consists of siliciclastic sandstone bodies of quartz and feldspar-white, just cemented that are interbedded within the Monte Piano Marl (Bettelli and al., 1987; Papanice et al., 2002 ).
macroscopic analysis ( TOYS, 2010th ) were found two main systems of faults and a subbordinato:
Charter exposure of the slope (Fig. 4, superimposed on the Charter of the micro- natural ) describes the orientation of the slope through the contours and colors of the same exposure. This feature is the azimuthal angle between true north and the direction perpendicular to the contours of the surface topography represented in the Charter of the micro- natural , measured clockwise. The azimuthal angles are referred to the four main compass points as shown in Table 2 and further divided into classes of 20 ° each color (fig. 4).
Analyzing the elevation data of the natural Charter of the micro-data can be retrieved morfostruttura on the shape of a pyramid. As described by TOYS (2010) morfostruttura the pyramid has a base shaped like a square with sides facing north and west straight e ben definiti (lati certi), mentre il lato a est è in parte definito e tracciabile e in parte mal definito. Il lato a sud è mal definito e non tracciabile a causa delle pratiche agricole che condizionano la morfologia del versante. La quota altimetrica della base della morfostruttura di Vesallo è pressappoco coincidente con la curva di livello dei 555 m, e i lati sono quasi tutti ortogonali tra loro, ad eccezione del vertice posto a SE il quale non conserva l’ortogonalità a causa della presenza di un dosso con direzione NO-SE e ben visibile nella Carta del microrilievo naturale (fig. 3). Inoltre si può notare come al procedere dalla base verso la vetta (quota di 587 m), la morfostruttura non conservi un perimetro a forma square, but since dall'isoipsa of 570 m assumes a triangular shape with one hand extended in NW-SE off coincides with the previously described (Fig. 3).
The two areas north and east seem to belong to one sector can be interpreted as the same NE-facing slope (azimuth angle around 30 ° / 60 °) and cut in half by a bump to NE-SW direction. This surely must be off genesis linked to water runoff concentrated at the watershed areas that previously described for selective erosion has affected the side bringing out the bumps in NW-SE (main) and SW-NE (subject to above). The sides of the pyramid
morfostruttura rake varies from point to point from 20 ° to 40 ° tilt (Fig. 4).
The slope located on the west side shows a smooth surface and planar geometry as evidenced by the exposure of the slope Charter (Fig. 4) and a variable slope and distributed in groups according to height as shown the Charter of the inclination of the slope (Fig. 5):
The regularity of the middle class with azimuth angle of 300 degrees and inclination of 30 ° is classified as a "triangular space" ( TOYS, 2010th ) at a sub-vertical tectonic structure in the direction of N30 ° and remarkable geomorphological features to macroscopic scale ( TOYS, 2010th ) and then back to selective erosion ( Panizzi, 1995; BRANCACCIO et al., 1977, 1978; TOYS, 2010th; 2010b). In the low-end (at the base of the slope) there is an adjustment of the slope at an angle of 20 ° (Fig. 5) due to the deposition of sediments that come from high-end carried by runoff water (affecting the slope across the contour lines as shown by the two watershed areas) or by gravitational processes (falling debris from the side).
Spatial mesostrutturale
It 'campaign was conducted by the writer mesostrutturale detection structures tectonic in three outcrops (Fig. 7). Were measured with the attitude geological compass (direction and inclination) and the stratification of the main faults and fractures in order to describe the structural setting of the area and assess the relationship with the sides of the pyramid morfostruttura Vesallo.
Conclusions The finding of a small outcrop on the summit of the hill (Fig. 10) which has a well-preserved stratification and in agreement with the data collected nell'affioramento 1, means that the phenomenon Vesallo pyramidal structure in the Province of Reggio Emilia is of natural origin ( TOYS, 2010th ). The altimeter data show evidence of ongoing processes of runoff likely to be accompanied by gravitational processes that regularize the low end of the slope with varying inclinations around 20 °. Thus, the genesis of morfostruttura pyramid is attributed to erosion and chemical weathering selective along the main tectonic structures ( TOYS, 2010th )
The regularity of the west slope (azimuth angle constant at about 300 ° and tilt 30 degrees throughout its length) is actually the result of the fault scarp retreat due to erosion and chemical weathering. Fault that does not present evidence to the mesoscopic scale geological and structural features but marked morphological characteristics to the macroscopic scale ( TOYS, 2010th ) presenting with sub-vertical structure of the plan and the direction of N30 ° (Fig. 2).
The model that describes the morphogenetic genesi di tale versante è rappresentato dal “modello denudazionale” per recessione rettilinea con variazione dell’inclinazione del versante ( BRANCACCIO e al., 1978; ripreso da BALOCCHI, 2010b ). Il versante è stato modellato da una serie di processi di alterazione chimica ed erosione fisica, in corrispondenza della principale struttura tettonica (con direzione N30°) portando all’arretramento del versante e alla sua riduzione di pendenza (impostandolo ad una inclinazione di 30°; BRANCACCIO e al., 1977; 1978; BALOCCHI, 2010b ). Successivamente alla base del versante è avvenuta una regolarizzazione del profilo con una inclinazione di 20° per l’accumulo di detrito from the upper part of the same side and transported by surface runoff or by gravitational processes (Fig. 14).
The two slopes north and south are the result of weathering processes and erosion along the two conjugate fault systems in the direction N260 ° and N160 ° -50 ° -50 ° (fig . 11) who find themselves in a persistent way in the formation Ranzano ( TOYS, 2010th ). The inclination of the fault plane along the NS direction is parallel to the slope (Fig. 15). Subsequently, the south side has been further shaped by the man through the practices agricole ha ulteriormente variato il profilo del versante.
Il fianco est sembra non essere interessato da faglie che condizionano la morfologia (ad eccezione dei sistemi di frattura nella formazione di Loiano a direzione N190°, che non si presentano all’interno della Formazione di Ranzano e pertanto non vengono considerate). Per questo fianco il modello morfogenetico, è da imputare alle acque di scorrimento superficiale che hano modellato il versante, attraverso la sua erosione della parte alta e sucessivamente alla deposizione nella parte bassa. La giacitura stratigrafica (le pieghe presentano una giacitura pressoché parallele al fianco est della morfostruttura; fig. 8) ha condizionando marginalmente la morfogenesi della collina (fig. 14).
Pertanto sia le strutture tettoniche fragili (faglie e fratture) sia le strutture plicative (pieghe) hanno influenzato il modellamento dei versanti da parte dei processi di erosione e alterazione chimica. Tale modello genetico può essere riportato anche ad altre morfostrutture piramidali essendo che il confronto dei dati macroscopici e mesoscopici fa presumere la sua validità ( BALOCCHI, 2010a; 2010b ).
Bibliografia