Burial and exhumation in a subduction wedge - Wiley Online Library
conductivity, and chemical properties of the sediments in subduction zones. To reach that ...... 1 to 5 W mÐ1 KÐ1 with low values for shales and sand-.
JOURNAL OF GEOPHYSICAL RESEARCH, VOL. 112, B07410, doi:10.1029/2006JB004441, 2007
Burial and exhumation in a subduction wedge: Mutual constraints from thermomechanical modeling and natural P-T-t data (Schistes Lustre´s, western Alps) P. Yamato,1 P. Agard,1 E. Burov,1 L. Le Pourhiet,1 L. Jolivet,1 and C. Tiberi1 Received 11 April 2006; revised 17 January 2007; accepted 12 February 2007; published 19 July 2007.
[1] The dynamic processes leading to synconvergent exhumation of high-pressure low-
temperature (HP-LT) rocks at oceanic accretionary margins, as well as the mechanisms maintaining nearly steady state regime in most accretion prisms, remain poorly understood. The present study aims at getting better constraints on the rheology, thermal conductivity, and chemical properties of the sediments in subduction zones. To reach that goal, oceanic subduction is modeled using a forward visco-elasto-plastic thermomechanical code (PARA(O)VOZ-FLAC algorithm), and synthetic pressuretemperature-time (P-T-t) paths, predicted from numerical experiments, are compared with natural P-T-t paths. The study is focused on the well constrained Schistes Lustre´s complex (SL: western Alps) which is thought to represent the fossil accretionary wedge of the Liguro-Piemontese Ocean. For convergence rates comparable to Alpine subduction rates (3 cm yr1), the best-fitting results are obtained for high-viscosity, low-density wedge sediments and/or a strong lower continental crust. After a transition period of 3–5 Ma the modeled accretionary wedges reach a steady state which lasts over 20 Ma. Over that time span a significant proportion (35%) of sediments entering the wedge undergoes P-T conditions typical of the SL complex (15–20 kbar; 350–450°C) with similar P-T loops. Computed exhumation rates (
precision of rock mechanics data, no progress was made in reducing the ...... Italy), using an ultra-violet laser ablation microprobe 40Ar â39Ar techni-.
polymer fracture, plasticity modifications are of value. It is possible ... is the energy per unit area necessary to produce the new fracture surface S. For a crack of ... come the crack resistance R. This is shown in Figure 4 for a linearly elastic
difunctional organic groups that connect the silicon atoms (1â4). The side groups R ..... (99), perfluoroalkyl (100,101), hydroxyl, dimethylamino, sodium sulfonate, ...
For example, solvent evaporation is a key step in spray dry encapsulation .... 7. Fig. 4. Schematic diagrams that illustrate the different types of interfacial ..... a sharp image on the reactive coating of the transfer sheet and large enough to ...
Polysaccharides are naturally occurring polymers in which the repeat unit consists ... This article describes the structure of the principal polysaccharides from nat- ... Initially, one of the forms was found to be dextrorotary (+) and was named. Tab
The results of polymerization between sebacic acid and fumaric acid, using ... tative list of polyanhydrides is shown in Table 2. ...... On the basis of result of a.
icon metal by the reaction of SiO2 and C in an electric arc furnace, a process ..... Many catalytic systems capable of promoting polycondensation of siloxanediols ...... coating the organic solution of resin onto an integrated circuit device, followe
Atomic clusters of transition metals embedded into polymeric matrices repre- sent a very attractive class of materials which combine properties belonging.
and enamines or ketenaminals. This reaction proceeds by a [2 + 2] cycloaddition reaction with subsequent ring opening to form polyamides. [2 + 4] cycloaddition.
Coradin V.T. (2000) Formacao de aneis de crecimiento e sazonal- idade da atividade cambial de dez especies lenhosas de Cerrado. PhD thesis, University of ...
ample of isotropic nanoparticles which either provide increased composite stiff- .... Small-angle x-ray scattering may provide some answers re- garding average ...
proved stretch-spinning system, the descendants of which survive today. ... dicate agreed to sell the viscose process rights and patents to Courtaulds for the.
ter, under-banks, tree roots) was measured as a percent coverage of each shelter type as .... partitioning to the known differentiation of fish community composi-.
from soluble precursors in a macromolecular solution (3,4) or the mineral slab ... The advantages of the polymer-layered nanocomposites are not only con- ..... Doping of polypyrroleâfluorohectorite nanocomposites with iodine vapors ... due to the h
of polyphosphazene chemistry is the very broad range of groups that can be easily ... There are three general methods to synthesize polyphosphazenes. One is the ring- ..... experiments carboxylated poly(diaryloxy)phospohazenes were used.
cycling, but their community dynamics and diversity are still poorly known, ... rare organisms that occasionally may become abundant (termed a 'seed bank' for.
Jul 11, 2008 - administration is undeniably an effective and life-saving treatment based on decades of success in alleviating re- spiratory distress caused by ...
Jun 10, 2011 - tries requiring unstructured meshes and high Reynolds number does not allow ... boundary conditions in a complex flow involving heat transfer, ...
measuring the release of glycerol in the presence of (â)-isoproterenol (10â6 M) for 1 h. ... and lipolytic capacities and in leptin production are consistent with the ...
of the polymer or other material, and T is the absolute temperature. Estimation .... Courtesy of the Society of Plastics Engineers, Inc. this has been ...... ties relative to some standard fluid of known viscosity, such as water, are readily determin
c-diversity into several dimensions (e.g. space and time), a pro- cedure called .... 110 L. Chalmandrier et al. .... framework is compatible with any kind of randomization pro- ..... provides tools which are adapted to testing the assumption on.
Oct 1, 2013 - the life-history traits studied. This work provides ... most relevant in evolutionary biology studies. Two main types of .... Due to its unique phenology, each life stage of the ...... population dynamic consequences of phenological.
May 24, 2006 - Molecular biology has enabled a rapid increase of knowledge ... tern, and repeated tooth replacement during life ...... Dynamics of tooth forma-.
Aug 27, 2013 - classic bis(mesityl) NHC ligand and a MIC ligand, pro- tonolysis of the ..... liths[110] with norborn-2-ene, tris(norborn-5-ene-2-ylmethyl- oxy)methylsilane, and [Ru]-1 ...... [272] J.-A. Richard, S. Y. Ng, D. Y.-K. Chen, Modern Tools