1,721,185 research outputs found
Conclusions
No full textThe main lessons learned from the case studies presented in this book are reviewed in order to formulate recommendations for further research and action in adaptation to climate change. Firstly, the present state of knowledge on the main components of vulnerability to climate change in large Sub-Saharan cities is assessed. To that end, the following set of components has been identified: hazard, sensitive area, exposure, adaptive capacity, adaptation measures, and risk. Next, a series of steps for improving available knowledge before or during planning adaptation is defined. Lastly, the issue of how to identify the most opportune adaptation options and measures is examined and a five-step process for planning adaptation is proposed as follows: 1. Identify possible measures; 2. Localize measures; 3. Plan measures; 4. Manage measures; and 5. Identify entry points. Challenges and related recommendations are outlined for each step of the process and with reference to the case studies of D
Peridotitic clots form southern Adamello mafic rocks: a window on primitive melt compositions
No full textDati Geocronologici Preliminari U-Pb Su Zircone Di Gneiss Leucocratici Della Sila (Calabria Centrale)
No full textThe Permian volcanic record in the Ligurian Alps (Northern Italy): from the Variscan towards the Alpine cycle.
No full textSubduction and crust recycling - Petrological evidence and U-Pb dating in mantle xenoliths from the Betic area (Spain)
No full textEmplacement of the Arzachena Pluton (Corsica-Sardinia Batholith) and the geodynamics of incoming Pangaea
No full textThe assembly of the Corsica-Sardinia Batholith (C-SB) coincides with final shaping of the Variscan belt and represents a key structure to unravel the feedbacks between partial melting, rheology and the evolution of collisional orogens. This paper presents a model for the genesis of the Arzachena pluton (AZN), one of the major calc-alkaline massifs of the C-SB, based on U-Pb zircon dating, thermobarometry and structural analysis. Major and trace element compositions indicate that AZN has hybrid characteristics between that of typical S- and I-type granites, that could be explained in terms of incremental melting of a heterogeneous crustal source made of metatexites and Ordovician calc-alkaline granitoids. Growth of the pluton started around 320-315. Ma with the emplacement at middle crustal level (0.37-0.4. GPa) of granodioritic melts within narrow, conjugate, NW-SE sinistral and E-W dextral shear zones. The main growth stage (311 + 6/- 4. Ma) is marked by emplacement of large volumes of monzogranitic melts that induced a local decrease of the crustal strength expressed by horizontal channel flow driven by the gravity. Finally (307.6 ± 3.5. Ma), leucogranites emplaced within radial and peripheral dilatant fractures developed during the cooling of the main body. The transition from magmatic to sub-magmatic and HT-solid state fabric observed throughout AZN indicates that deformation plays a non-trivial role during the growth of the magmatic system. Restoring the position of the Corsica-Sardinia block to early Permian coordinates allow to recast the birth of the C-SB in a consistent geodynamic framework that conciliates the development of conjugates strike-slip structures, the oroclinal bending of the chain and the thermal relaxation. This study indicates that the C-SB had an active role during post-orogenic extension rather than being just a consequence of it. © 2012 Elsevier B.V
Late Neo-Proterozoic-Early Cambrian acidic rocks from an Alpine shear zone in Sila Massif (Calabria): LA-ICP-MS U-Pb dating on zircon
No full textU-PB geochronological data in zircon crystals in metamorphic rocks of continental crust from the Frido unit, (Southern Apennines), using the LA-ICP-MS
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