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GEO-TECTONICS  May 2005

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Subject:

Session T12 "Tectonic inversion..." - GEOITALIA 2005 Conf.

From:

Enrico Tavarnelli <[log in to unmask]>

Reply-To:

Tectonics & structural geology discussion list <[log in to unmask]>

Date:

Wed, 25 May 2005 12:54:27 +0200

Content-Type:

text/plain

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text/plain (125 lines)

Hi all,


Topical Session T12 - "Tectonic inversion and crustal reactivation in
orogenic belts: examples from the Apennine-Maghrebide system", at the
GEOITALIA 2005 Conference, to be held on Sept. 23rd-25th in Spoleto, Italy.


We welcome thematic contributions on the processes of fault and shear zone
reactivation in regions that have experienced tectonic inversion.
Multidisciplinal studies, with field investigation, numerical and physical
analogue modelling, seismic line interpretation, are greatly appreciated.
Special attention will be dedicated to examples from the
Apennine-Maghrebide system, but field cases from other inverted settings
are equally welcome. Additional information is to be found queued to this
message.

Keynote Address: Rob Butler (University of Leeds, UK).


Please note that the deadline for abstract submission is June 13. You can
register at the following web-site:

http://www.geoitalia.org

We look very much forwards to receiving your contributions!!!

Enrico Tavarnelli
Fernando Calamita
Pietro Renda
=================
____________________________________________________________

GEOITALIA 2005 - Topical Session T12 "Tectonic inversion and crustal
reactivation in orogenic belts: examples from the Apennine-Maghrebide
system"
Enrico Tavarnelli, Università di Siena, Fernando Calamita, Università G.
D'Annunzio, Chieti, Pietro Renda, Università di Palermo.

Changes in tectonic regimes are common during deformation of continental
crust, and the effects of such changes are significant within most orogenic
belts, because of the relatively long geological history of these crustal
provinces. The processes related to changes in tectonic regimes, indicated
as inversion processes, generally inhibit reactivation or reworking of
regionally important faults, shear zones and deformation belts. Significant
examples are reported from the frontal or outer zones of orogenic belts,
whose geometry may result from the interaction of contractional structures,
such as thrusts and related folds, with pre-existing synsedimentary normal
faults (positive inversion). Other examples are described in the innermost
orogenic provinces, where previously stacked tectonic units have been
modified by post-orogenic extensional deformations (negative inversion).
Less documented, but not less important in defining the final shape of
orogenic belts, are cases of strike-slip, transpressional or transtensional
reactivation of pre-existing structures.
Tectonic inversion and reactivation processes have severely influenced the
geometry and geodynamic evolution of most perimediterranean orogenic belts.
This session aims at illustrating the behaviour of pre-existing faults and
deformation zones, and at evaluating the role of these structures during
the construction of collision mountain belts, with examples mainly derived
from the Apennine-Maghrebide orogenic system. Contributions from structural
analysis at different scales, integrated studies on the relationships
between tectonics and sedimentation, analogue modelling and imaging of deep
structures through seismic profile interpretations are welcome. It is
expected that the presented contributions, subject to peer review
procedures, are collected in a thematic volume or journal of international
diffusion.

KEYNOTE SPEAKER: Rob Butler, University of Leeds (UK).


___________________________________________________________
GEOITALIA 2005 - Sessione Tematica T12 "Tettonica da inversione e
riattivazione di settori crostali durante i processi orogenici, con
particolare riferimento al sistema Appenninico-Maghrebide".
Enrico Tavarnelli, Università di Siena, Fernando Calamita, Università "G.
D'Annunzio", Chieti, Pietro Renda, Università di Palermo.

I cambiamenti di regime tettonico rappresentano un fenomeno molto comune
nella deformazione della crosta continentale, e gli effetti di questi
cambiamenti sono particolarmente evidenti nelle catene orogeniche, a causa
della loro lunga storia deformativa. I processi legati all'inversione di
regime si esplicano generalmente tramite la riattivazione o la
rimobilizzazione di faglie, di zone di taglio o di settori crostali
precedentemente deformati. Esempi significativi provengono dalle zone
esterne e frontali delle catene, la cui geometria può risultare complessa a
causa dell'interferenza di pieghe e sovrascorrimenti con preesistenti
strutture distensive sinsedimentarie (inversione positiva). Altri esempi
riguardano invece i settori interni delle catene, dove la distensione
post-orogenica interessa settori di crosta predcedentemente ispessita per
collisione continentale (inversione negativa). Meno noti, ma non meno
importanti nella definizione dell'assetto strutturale delle catene, sono
infine i casi di inversione trascorrente, transpressiva o transtensiva.
I processi di inversione tettonica e di riattivazione hanno profondamente
influenzato l'assetto geometrico e l'evoluzione geodinamica delle catene
circummediterranee. Questa sessione si ripropone di illustrare il
comportamento di faglie e zone di taglio pre-orogeniche, e di mettere in
rilievo il ruolo svolto da queste strutture durante la costruzione delle
catene orogeniche, con particolare riguardo al sistema
appenninico-maghrebide. Sono benvenuti contributi di analisi strutturale
condotta a scale diverse, studi integrati sui rapporti fra tettonica e
sedimentazione, lavori di modellizzazione analogica e ricostruzioni di
strutture profonde tramite interpretazione di profili sismici. E' previsto
l'allestimento di un volume tematico, facente parte di una rivista o
collana con diffusione internazionale, nel quale saranno raccolti i lavori,
soggetti a procedura di revisione critica, presentati in occasione della
sessione.

PRESENTAZIONE AD INVITO: Rob Butler, Università di Leeds, UK





       \\\\\\
       ( @ @ )
-----o00-(_)-00o-----
Enrico Tavarnelli
Dipartimento di Scienze della Terra,
Universita' di Siena,
Via Laterina n. 8,
53100, Siena - Italy,
phone: ++39-(0)577-233 984
fax: ++39-(0)577-233 938
e-mail: [log in to unmask]

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