452 research outputs found
Correction to:Tracing the Eh–pH evolution of Cu–Pb–As–Zn supergene mineralization using detailed petrography in the Cap Garonne mineral deposit (Provence, France) (Mineralium Deposita, (2024), 59, 6, (1249-1271), 10.1007/s00126-024-01258-3)
No full textThe original version of this article unfortunately contained a mistake. Authors names were reversed. From: Poot Julien · Buelens Pierre · Dekoninck Augustin · Rochez Gaëtan · Yans Johan Should be corrected to: Julien Poot · Pierre Buelens · Augustin Dekoninck · Gaëtan Rochez · Johan Yans The original article has been corrected.</p
Groupe VI : Géologie. Lithostratigraphie, minéralogie, âges et diagenèse des sédiments à faciès wealdien du Bassin de Möns (Belgique), par Johan Yans. Rapports des commissaires
No full textRobaszynski Francis, Delmer André. Groupe VI : Géologie. Lithostratigraphie, minéralogie, âges et diagenèse des sédiments à faciès wealdien du Bassin de Möns (Belgique), par Johan Yans. Rapports des commissaires. In: Bulletin de la Classe des sciences, tome 15, n°7-12, 2004. pp. 372-375
Mo Yans "Wa"
No full textIn dieser Arbeit werden die Themen Geburtenkontrolle und bäuerlicher Widerstand behandelt und es wird eine Verbindung der beiden Bereiche hergestellt. Historische und soziopolitische Aspekte werden beleuchtet und die Frage, ob die Durchsetzung der Geburtenkontrolle auf dem Land möglich ist oder nicht, wird beantwortet. Gerüst der Schrift ist Mo Yans „Wa“. Deshalb spielen der Autor und sein Werk eine große Rolle und auch die Beantwortung der Forschungsfrage stützt sich in der Argumentation hauptsächlich auf diesen Roman, der von der Geburtenplanung in China handelt.This thesis is an attempt to establish a connex between birth control and peasant resistance. In the process of finding an answer to the question of whether or not birth control is possible in rural China historical and socio political aspects are considered. Mo Yan`s "Wa" is framework to the thesis. Therfore, the author and his novel play an important role and are crucial to finding an answer to the above mentioned question
L’importance du contexte : Repères culturels et structure familiale dans la société Yans (Zaïre)
No full textLes descriptions traditionnelles de la structure des relations entre père, mère et enfant permettent mal de rendre compte de l'impact des transformations actuelles de la structure familiale sur le devenir de l'enfant. En se référant au concept de filiation instituée développé par Guyotat, l'auteur propose d'accorder plus d'importance à la manière dont les positions sont en train de se redéfinir dans la société actuelle et de «con-textualiser culturellement» nos schémas d'observation et d'analyse. Des données concernant la manière dont opère l'institution de la filiation dans une société lignagère matrilinéaire, la société Yans du Zaïre, mettent en relief l'influence du contexte culturel sur les mécanismes d'institution de la filiation. En partant d'analyses de rituels, d'institutions et de croyances, l'article analyse la façon dont la société Yans marque d'une manière spécifique et différentielle la relation à la mère, à l'oncle maternel et au lignage, la relation au père, et la relation au grand-père et entre générations alternées. L'analyse met en lumière le rôle médiateur des deux derniers registres de relation par rapport à l'entreprise clanique et montre l'importance de cette médiation en regard du développement d'une dimension individuelle de l'existence. Le texte s'ouvre sur une interrogation portant sur la place de la médiation dans les nouvelles formes de structure familiale.Traditional descriptions of the structure of relations between father, mother and child make difficult a realization of the impact of current transformations of family structure on the development of the child. Referring to the concept of instituted filiation developed by Guyotat, the author proposes that greater importance be accorded to the manner in which positions in present society are in the process of redefining themselves, and that our analytical and observational schemata be "culturally contextualized". Data concerning the manner in which the institution of filiation operates in a society of matriarchal lineage, the Yans society of Zaïre, highlights the influence of cultural context on the mechanism which establishes filiation. Proceeding from analyses of rituals, institutions and beliefs, the article analyzes the way in which Yans society marks, in a specific and differentiated manner, the relation to the mother, to the maternal uncle and to the lineage, the relation to the father, and the relation to the grandfather, and between alternate generations. The analysis sheds light on the mediating role of the two latter relational registers with regard to the hold of the clan, and shows the importance of this mediation in relation to the development of an individual dimension to existence. The text opens itself to a questioning directed at the place of mediation in new forms of family structure
Distribution of trace elements in the secondary minerals of Zn-Pb deposits:new results from Belgium and Morroccan willemite deposits
No full textNew observations and elementary chemical-mineralogical analyses of willemite (Zn2SiO4) mineralization from non-sulfide Zn-Pb deposits of La Calamine (Eastern Belgium) and Bou Arhous (Morroccan High Atlas) have been carried out. This study aims at evaluating the critical element distribution and deportmentmigration, in order to establish the potential of such deposits. In both cases, willemite occurs as a variety of types that continuously formed between the protore stage (sulfides) and the late supergene stage (carbonates and hydrated phases). Based on microscopic observations, different types of willemite may be distinguished by their shapes and zoning characteristics, supporting 1) a polyphase non-sulfide mineralisation, after the protore stage, 2) local dissolution–reprecipitation processes of willemite and 3) coprecipitation of willemite and secondary Pb minerals like such as cerussite and galena. A significant change of major elements composition obtained by EPMA in the different generations of willemite is recorded. LA-ICP-MS measurements of minor and trace elements also reveal a strong variability between the different various willemite types.In the La Calamine samples, we measure abnormal high contents in P, Cd, As, Pb, Ag and Sb, the three latter ones being related to tiny galena inclusions. The Ga and In contents are very low (less than 4 ppm) or below detection limits, respectively. Significant Ge contents up to 250 ppm were is measuredobserved. In the samples from Bou Arhous, willemite is variably enriched in Ge (up to 1000 ppm). Depending on the willemite generation, this substitution is positively or negatively correlated to the Zn-Pb substitution. According to the nature of zoning (sector versus oscillatory), the incorporation of Ge was either controlled by crystallographic factors or by the nature of the mineralizing fluids.While, in the case of Belgium, the concentrations measured in willemite are very similar to those in sphalerite (averaging 250 ppm), the Moroccan willemite are enriched compare to the primary sulfides (less than 100 ppm). This may indicate that sphalerite played a role of precursor, but an additional input of minor and trace elements by external fluids is also necessary. This conclusion agrees is in agreement with the current models that suggestsuggesting that a strict supergene origin of willemite in numerous deposits is disputable and a contribution of low temperature hydrothermal fluids for willemite precipitation should be considered.ReferencesChoulet F, Richard J, Boiron M-C, Dekoninck A, Yans J. 2019. Distribution of trace elements in willemite from the Belgium non-sulphide deposits. European Journal of Mineralogy, 31: 983-997.Choulet F, Barbanson L, Buatier M, Richard J, Vennemann T, Ennaciri A, Zouhair M. 2017. Characterization and origin of low-T willemite (Zn2SiO4) mineralization: the case of the Bou Arhous deposit (High Atlas, Morocco). Mineralium Deposita, 52: 1085-1152.<br/
Gestion durable des ressources minérales en Wallonie (Belgique):singularités et pistes de réflexion.
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