907 research outputs found
Crustal redistribution, crust-mantle recycling and Phanerozoic evolution of the continental crust
Internal structure and tectonic evolution of an underthrust tectonic m\ue9lange: the Sestola-Vidiciatico tectonic unit of the Northern Apennines, Italy
The Sestola-Vidiciatico Tectonic Unit (SVTU) in the Northern Apennines is an underthrust tectonic melange presently sandwiched between the Tuscan-Umbrian foredeep units and the overlying Ligurian/Subligurian thrust-nappe. The SVTU has been generated during the collision between the European and the Adria plates and now it separates the former oceanic accretionary wedge -Ligurian/Subligurian thrust nappe-from the underlying fold-and-thrust belt formed by Adria sedimentary units. The collision caused an eastward migrating foredeep basin and the overthrusting of the frontal part of the Ligurian/Subligurian thrust-nappe on the subducting Adria margin. Part of the inner lower-slope sediments of the migrating foredeep basin have been unconformably deposited on a frontal prism formed by material already accreted in the Ligurian/Subligurian prism gravitationally and tectonically reworked. The frontal prism and its sedimentary cover have been progressively dragged down along the plate boundary zone generating the SVTU. The lower-slope sediments have been incorporated in the melange as they were not completely lithified, and they show a long deformation history ranging from continuous and pervasive soft-sediment deformation to discontinuous brittle deformation concentrated along faults and mainly controlled by cycles of fluid pressure as testified by the presence of crack-and-seal texture and implosion breccia in the veins
seamount chain subduction zone interactions implications for accretionary and erosive subduction zone behavior
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Self help groups in a city of Tuscany: Reconstruction of the second generation model of work for professionals and services
This study is part of a more extensive project aimed to investigate the effectiveness of self-help group participation in improving quality of life in mental disease. The study is taking place in the Tuscany Region, in Italy. In the first qualitative step of analysis researchers are interested in describing the specific features of the psychiatric self-help movement in Tuscany, comparing different realities, networks, kind of groups. Therefore, our aim is to collect exhaustive information to describe how self-help system work in different provinces at the present moment. The implementation of groups for psychiatric problems is quite young in Italy. Because of a lack of specific regulation in the directives of the Italian health care system, every local service has implemented groups differently, sometimes enhancing, sometimes dismissing them. Prato, near Florence, is one of the more interesting context for the birth of psychiatric self-help movement in the region: public health services improved groups since early 90’s, it was one of the first self-help reality linked to services in the entire region. Now we are in a “second generation” of professionals, and the original meaning of groups seems to be transformed, sometimes misunderstood. Our objectives of study head us toward an in depth analysis of self-help phenomenon in Prato
Self help groups in a city of Tuscany: Reconstruction of the second generation model of work for professionals and services
This study is part of a more extensive project aimed to investigate the effectiveness of self-help group participation in improving quality of life in mental disease. The study is taking place in the Tuscany Region, in Italy. In the first qualitative step of analysis researchers are interested in describing the specific features of the psychiatric self-help movement in Tuscany, comparing different realities, networks, kind of groups. Therefore, our aim is to collect exhaustive information to describe how self-help system work in different provinces at the present moment. The implementation of groups for psychiatric problems is quite young in Italy. Because of a lack of specific regulation in the directives of the Italian health care system, every local service has implemented groups differently, sometimes enhancing, sometimes dismissing them. Prato, near Florence, is one of the more interesting context for the birth of psychiatric self-help movement in the region: public health services improved groups since early 90’s, it was one of the first self-help reality linked to services in the entire region. Now we are in a “second generation” of professionals, and the original meaning of groups seems to be transformed, sometimes misunderstood. Our objectives of study head us toward an in depth analysis of self-help phenomenon in Prato
Modelling tectonic deformation along the North-Anatolian Fault in the Sea of Marmara
Using analogue techniques, we attempted to model the complex tectonic deformation pattern observed along the North-Anatolian Fault in the Sea of Marmara from morpho-bathymetry and seismic reflection images. In particular this paper focuses on the so-called Cinarcik segment of the fault connecting the eastern Izmit segment, which entirely ruptured during the Mw 7.4, 1999 earthquake, to the western segment of the Central High. The Çınarcık segment, potentially loaded after the Izmit earthquake, is expected to rupture during an earthquake occurring in the near future, possibly the next decades, with a high potential to affect the Istanbul metropolitan area. Our analysis suggests that the development of the observed structures accommodating strike-slip, transtensional and transpressional deformations, could be explained by changes in the geometry of fault segments within a right-lateral strike-slip tectonic regime. Tectonic deformations were reproduced in the analogue model by imposing a small (about 10°) and sharp difference in the relative orientations of the strike-slip segments at the edges of a major releasing bend. In the model slower strain accumulation occurs along the analogue of the Çınarcık segment than along the analogue of the Izmit segment of the fault. This would predict a delay for earthquakes triggered by stress transfer between the Izmit and Çınarcık segments. The model further predicts that most of the deformation in the Çınarcık basin is controlled by the sharp changes in the geometry of the fault itself
Fluid history related to the early Eocene-middle Miocene convergent system of the Northern Apennines (Italy). Constraints from structural and isotopic studies
The late Eocene-middle Miocene erosive plate boundary between the European and
the Adriatic plates is exhumed in the Northem Apennines of Italy. The fossil fault zone is
500 m thick and the outcropping portion exposes the :first 5 km of its depth. At this
plate boundary basai and frontal tectonic erosion incorporated unlithified, fluid-rich sediments
into the fault zone. The deformation and nature of the material along the plate boundary define a
fossil subduction channel. Here we couple a detailed structural analysis of the Apennine subduction
channel, focusing, in particular, on calcite veins, with a stable isotope analysis to characterize
the fluid regime along an active subduction channel.
The 13C and 180 composition of calcite vein and host rock samples within the fault zone
indicates that there is a deep metamorphic source of fluids migrating upward along the subduction
channel, in addition to locally derived fluid components. Dewatering of subducting turbidites
contributes significantly only in the shallowest part of the channel. Structural observations
indicate fluid flow along and across the subduction channel. At deep levels fluid flow is
associated with discrete deformation events on shear faults offset by dilational jogs :filled with
implosion breccias. At intennediate levels deformation is stili cyclic and associated with repeated
crack-and-seal events. At the shallowest levels deformation occurred, while portions of the
subducting material were stili unlithi:fied. Here the deformation was quasicontinuous, without
associated vein development. Both isotope and structural analyses indicate that this erosive
subduction channel behaved as a weak: fault with a vertical maximum principal stres
Mutational analysis of BCORL1 in the leukemic transformation of chronic myeloproliferative neoplasms.
BCORL1 mutations do not seem to be commonly associated with leukemic transformation of MPN, further substantiating the different molecular profile compared with denovo leukemias. Although the small number of cases does not allow us to exclude that BCORL1 mutations can be found also in post-MPN AML, their occurrence is, at least, very infrequent and their detection does not appear to deserve clinical relevance
Horizontal principal stress orientation in the Costa Rica Seismogenesis Project (CRISP) transect from borehole breakouts
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