Search results for "Illite"
showing 10 items of 74 documents
Experimental alteration of granitic rocks: Implications for the evolution of geothermal brines in the Upper Rhine Graben, Germany
2020
Abstract Geothermal energy exploitation in the Upper Rhine Graben (URG) chiefly has targeted faults and fractures within or connected with the crystalline basement, where hot fluids of c. 200 °C circulate at depths of c. 5 km. Formation fluids of the crystalline basement are highly saline, NaCl-dominated brines, whereas shallow crystalline basement water ( The trace element concentrations of the leachates are hereby related to the composition and stability of minerals in the rocks and can be directly linked to the proposed and observed dissolution processes at the different temperatures. In experiments with pure water at 70 °C, representing the recharge or infiltration conditions, water-roc…
Pedogenesis in disturbed alpine soils (NW Italy)
2002
In alpine environments, natural or man-induced disturbances are fairly common and acknowledged as determining factors in pedogenesis and soil distribution. We have selected a representative alpine valley in the Italian Northwestern Alps to evaluate the effects of perturbations of different intensity and frequency on soil development and weathering during the last few centuries. In order of decreasing disturbances, we selected: (i) an active avalanche shoot; (ii) a man-built terrace; (iii) a park-like forest; and (iv) a coniferous forest. In the two most disturbed sites, independently of the intensity and frequency of the disturbances, the active pedogenic processes are restricted to the top…
La procédure de sauvegarde : se mettre sous la protection de la justice tout en restant chef dans son entreprise
2007
National audience
Chemical variations in clay minerals of the Archaean Barberton Greenstone Belt (South Africa)
1996
Abstract Four rock profiles of shales, carbonates and greywacke-type sediments were sampled from the mafic compositional influenced sedimentary Fig Tree Group and from overlying, more felsic related, sedimentary Moodies Group of the Archaean Barberton Greenstone Belt in South Africa. Clay separates of forty sedimentary rocks were examined by XRD and SEM to study the mineralogical, chemical and morphological variations of the constitutive illite and chlorite. The clay minerals showed a significant K-enrichment in the illites and Mg- and Fe-depletions in the chlorites upwards the stratigraphic sequence. Three independent parameters influenced these variations: (1) a change in the origin of th…
High-resolution clay mineralogy as a proxy for orbital tuning: example of the Hauterivian-Barremian transition in the Betic Cordillera (SE Spain).
2012
11 pages; International audience; The response of clay mineral assemblages to potential orbital forcing is tested in Mesozoic hemipelagic marl- limestone rhythmites of the Río Argos section (Betic Cordillera, Southeastern Spain). Along the section, marls are pervasively enriched in kaolinite and illite, whereas limestones are enriched in smectite-rich illite/smectite mixed-layers, suggesting that marl-limestone alternations are produced by cyclic high-frequency fluctuations of continental runoff. Spectral analyses show that clay mineral assemblages evolve accordingly to precession, obliquity and eccentricity cycles. Durations of ammonite zones are assessed at 535 kyr for the Late Hauterivia…
Improving Textual Competence in a Second Language Initial Literacy Classroom
2019
The paper aims to illustrate some textual learning activities developed for an L2 Italian initial-literacy classroom, and, in particular, for illiterate plurilinguals (mostly unaccompanied foreign minors). The activities in question belong to an experimental proposal that consists of a specific textual teaching module integrated with a second-language initial literacy course employing the communicative/affective-humanistic teaching approach. Textual activities are normally proposed to intermediate and advanced level literacy learners in second- language classrooms, in order to fully develop reading and writing abilities (i.e. functional literacy). However, based on the importance of learner…
Déclaration et vérification des créances. Faillite internationale d'un établissement bancaire, Créanciers étrangers, Eléments de preuve de l'existenc…
1996
International audience; (Com. 14 mai 1996, Wight ès qual. et autres c/ Mme Carrasset-Marillier, ès qual. et autres ; Com. 14 mai 1996, Société BCCI Luxembourg et autres c/ Mme Carrasset-Marillier, ès qual. et autres ; Com. 14 mai 1996, Société Holdings BCCI Luxembourg et autres c/ Mme Carrasset-Marillier, ès qual. et autres ; Com. 14 mai 1996, Société Crédit and Financial Corporation LTD et autres c/ Mme Carrasset-Marillier, ès qual. et autres ; Com. 14 mai 1996, Société International Credit Investment Compagny Limited et autres c/ Mme Carrasset-Marillier, ès qual. et autres ; Com. 14 mai 1996, Société Banco de Financiamento International c/ Mme Carrasset-Marillier, ès qual. et autres)
Conditions de fond concernant les cas d'ouverture des procédures
2007
International audience
Bulk composition of northern African dust and its source sediments — A compilation
2013
Abstract This paper presents a review of bulk compositional data of northern African dust and its potential source sediments and includes elemental, isotope and mineralogical data. Northern African dust represents about one half of the total global atmospheric mineral dust burden, and its uplift, transport and deposition have strong impacts on climate and various terrestrial and marine ecosystems. The chemical data set shows, that an ‘average northern African dust’ exhibits comparable Si, Fe and Mn contents with respect to the average composition of the upper continental crust, is slightly depleted in the alkali metals K and Na, and enriched in Ti and P. However, the complete data set yield…
Revista electrónica interuniversitaria de formación del profesorado
2016
La realidad socioeducativa actual demanda de los profesionales de la educación una intervención comprometida y coherente para el desarrollo de competencias y habilidades emocionales. Es necesario complementar lo académico y cuantificable con aquello que sobrepasa las barreras del centro e influye en el rendimiento y desarrollo personal y social del alumnado. Las relaciones que se dan entre los componentes de la triada emoción, pensamiento y acción regulan cada momento de nuestros días, pudiéndose ver estas alteradas negativamente por estímulos externos que en ocasiones, no somos capaces de gestionar adecuadamente. Esta incorrecta gestión emocional tiene su base en un creciente analfabetismo…