1,721,035 research outputs found
The Monte Penna thrust (Southern Tuscany, Italy): geometry and kinematic of a collisional structure affecting the Tuscan Nappe during the Northern Apennines orogenic building
No full textIn this paper we describe the geometry and kinematics of a contractional
structure, consisting of a thrust and related minor structures,
which doubled the Tuscan Nappe cropping out in the southern
side of the Monte Amiata geothermal region (Selvena-Castell’Azzara
area), during the building of the Northern Apennines. Such a thrust
(hereafter the Monte Penna thrust, MPT) is documented, in this area,
for the first time. The integration of fieldwork with mine data from
two different cinnabar/stibnite mines helped us to better define the
thrust geometrical setting both at the surface and underground.
Thrusting took place during the Early Miocene and produced the tectonic
repetition of the Tuscan Nappe succession. The thrust gave rise
to two tectonic subunits (SU1 and SU2) separated by a contractional
shear zone up to 3m thick. Such a shear zone consists of three structural
domains characterised by different structures such as folds, a
tectonic foliation, reverse faults and Riedel shear fractures. They indicate
a top-to-the ESE sense of shear, coherently with the general
staking pattern of the Northern Apennines belt at least for the study
area and surroundings.
The thrust-sheet was deformed by cartographic- to mesoscopic
folds, N135° to N220° striking on average, NE- and SE-verging,
respectively. The tectonic setting recognised in the study area is
coherent with that of the Tuscan Nappe described for the Monte
Amiata region and the whole southern Tuscany, resulting characterised
by duplex system. Such a duplex system was affected by
extensional structures since the Middle Miocene. Presently, the
thrusts consist of relic structures preserved within extensional
horses. The whole evidence possibly make the Tuscan Nappe duplex
system comparable with the structure of the Tuscan Metamorphic
«basement», in terms of geometry, stacking pattern and timing, suggesting
a probable common structural evolution even if a different
structural level
Interazione fra strutture trascorrenti e distensive nella circolazione idrotermale collegata alle mineralizzazioni a cinabro: l'esempio della Valle delle Solforate
No full textExtensional and strike-slip tectonics across the Monte Amiata-Monte Cetona transect (Northern Apennines, Italy) and seismotectonic implications
No full textLa fissure-ridge di travertino di Bagni S.Filippo: un esempio di circolazione idrotermale collegata a faglie trascorrenti quaternarie (Monte Amiata, Toscana meridionale)
No full textTradizione e innovazione nella gestione tecnico-viticola del Sangiovese.
No full textL’evoluzione in termini qualitativi e la contemporanea contrazione dei consumi di vino, hanno imposto una sostanziale modificazione della gestione tecnico-colturale dei vigneti. Si è quindi cercato di mettere in atto a diversi livelli, tecnico-pratico e scientifico, un modello di viticoltura compatibile con le caratteristiche ecopedologiche dei siti di coltivazione, in cui fosse necessario il minimo di input esterni per raggiungere i livelli qualitativi massimi possibili in relazione alla vocazione ambientale.
Per trattare di tecniche colturali applicate al vigneto si può partire da diversi approcci: di quanto si possono tagliare i costi di produzione, quanto può essere migliorata l’espressione del territorio nel prodotto finale. Per le regioni costrette per situazioni ambientali e per limitazioni di carattere normativo a produrre a livelli bassi per ettaro, non può che esistere la seconda soluzion
Risposte qualitative di applicazioni fogliari di macro- e microelementi su cv. Sangiovese (Vitis vinifera L.).
No full textStudio dello stato idrico di piante di Sangiovese (Vitis vinifera L.) sottoposte a trattamenti fogliari con calcio.
No full text
Transtensional shear zones controlling volcanic eruptions: the Middle Pleistocene Mt Amiata volcano (inner Northern Apenines, Italy)
No full textThe Mt Amiata volcano is characterized by the SW-NE alignment of the eruption centres, as well as other Italian Pleistocene volcanoes. We carried out a structural and kinematic analysis in a broad stripe comprehending the eruption centres and the substratum, towards NE and SW. The results point out that a transtensional left-lateral brittle shear zone affects the pre-Neogene substratum, the Middle Pleistocene volcanic rocks and the Late Pleistocene travertines. This transtensional structure is active since the Early Pliocene. It controlled the location of the eruption centres through pull-apart structures, thus providing the deep structural channels for the uprising of magma to the surface. The Mt Amiata volcano represents a key study area to investigate the Pleistocene to Present relationships between tectonics and magmatism in the Tyrrhenian area. © 2010 Blackwell Publishing Ltd
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