Micro-imagerie de matériaux anciens complexes (I)

This article aims at presenting the first results of a transdisciplinary research programme in heritage sciences. Based on the growing use and on the potentialities of micro- and nano-characterization synchrotron-based methods to study ancient materials (archaeology, palaeontology, cultural heritage, past environments), this contribution will identify and test conceptual and methodological elements of convergence between physicochemical and historical sciences.     

“Soldiers of Christ” from the Byzantine Perspective: Monks,Emperors, and Conflict in the Early Byzantine Empire

This article is an exploration of concept of monks as “soldiers of Christ” in Byzantine Anatolia during the late sixth and early seventh centuries CE. Through a case study of Theodore of Sykeon, this article will explore monks as agents of continuity in the Byzantine Anatolia of the late sixth and early seventh centuries through Theodore's conflicts with the emperors, imperial authorities, and the regional episcopal hierarchy. The conflicts Theodore had with various authority figures of his time were about helping them see the right path of supporting Catholic orthodoxy as the normative belief system of Byzantine society and integrating his rural community of Sykeon into the wider web of imperial and episcopal urban patronage. Thus, conflict in this context was a catalyst for social order and stability rather than a symptom of social collapse. This article also fits into the historiography of the holy man as local patron in Late Antiquity, suggesting an alternate interpretation of this phenomenon as first put forward in Peter Brown's seminal works on this subject.     

ENTANGLED MEMORY: TOWARD A THIRD WAVE IN MEMORY STUDIES

This essay takes up the call for a “third phase” in memory studies and makes theoretical and methodological suggestions for its further development. Starting from an understanding of memory that centers on memory's temporality, its relation to language, and its quality as a social action, the essay puts forward the concept of “entangled memory.” On a theoretical level, it brings to the fore the entangledness of acts of remembering. In a synchronic perspective, memory's entangledness is presented as twofold. Every act of remembering inscribes an individual in multiple social frames. This polyphony entails the simultaneous existence of concurrent interpretations of the past. In a diachronic perspective, memory is entangled in the dynamic relation between single acts of remembering and changing mnemonic patterns. Memory scholars therefore uncover boundless cross‐referential configurations. Wishing to enhance the dialogue between the theoretical and the empirical parts of memory studies, we propose four devices that serve as a heuristic in the study of memory's entanglement: chronology against time, conflict, generations, and self‐reflexivity. Current debates on European memory permit us to explore the possible benefits that the concept of entangled memory carries for memory studies.     

Le Travail Intellectuel au Moyen Âge

Sans résumé étienne Anheim est ma?tre de conférences en histoire médiévale à l’Université de Versailles/Saint-Quentin-en-Yvelines. Ses recherches portent sur les formes de la culture savante (peinture, musique, littérature) à la fin du Moyen ?ge, et sur leurs relations avec les cours. Il a récemment publié ?La Chambre du Cerf. Image, savoir et nature à Avignon au milieu du xiv ^e siècle ? (Micrologus, vol. XVI, 2008, p. 57–124). Sylvain Piron est ma?tre de conférences à l’école des hautes études en sciences sociales. Ses recherches portent sur différents aspects de l’histoire intellectuelle du Moyen ?ge central, de la pensée économique des scolastiques à l’ecclésiologie des franciscains spirituels. Il vient de publier ?Le poète et le théologien: une rencontre dans le studium de Santa Croce ?, dans Jo?l Biard et Fosca Mariani Ziani, éd, Ut philosophia poesis. Questions philosophiques dans l’écriture de Dante, Pétrarque, Bocacce (Paris, Vrin, 2008, p. 73–112).     

Frankish military duty and the fate of Roman taxation

Frankish kings exacted unpaid military service from their subjects in both Merovingian and Carolingian times. The basis for this right has long been uncertain. A study of the term ‘manse’ as a Carolingian measure of assets brings to light the ostensibly hidden property on whose basis Franks went to war. This military duty reached back to the origins of the Frankish kingdom, when a large share of Roman taxes was awarded in individual allotments to soldiers obligated to serve, otherwise unpaid, when summoned, and heavily fined if they did not. Both demesne and tributary manses – contributory units – were the main part of state resources applied to military costs. They cannot be simply envisaged as components of an agricultural scheme (grand domaine). A tax‐like military obligation was one among several institutions actively surviving from the fifth century to the ninth, and it suggests that Frankish government was more law‐based and administrative than is often allowed.     

Fracture-fill calcite as a record of microbial methanogenesis and fluid migration: a case study from the Devonian Antrim Shale, Michigan Basin

The Devonian Antrim Shale is an organic‐rich, naturally fractured black shale in the Michigan Basin that serves as both a source and reservoir for natural gas. A well‐developed network of major, through‐going vertical fractures controls reservoir‐scale permeability in the Antrim Shale. Many fractures are open, but some are partially sealed by calcite cements that retain isotopic evidence of widespread microbial methanogenesis. Fracture filling calcite displays an unusually broad spectrum of δ¹³C values (+34 to ?41‰ PDB), suggesting that both aerobic and anaerobic bacterial processes were active in the reservoir. Calcites with high δ¹³C values (>+15‰) record cementation of fractures from dissolved inorganic carbon (DIC) generated during bacterial methanogenesis. Calcites with low δ¹³C values (13C values between ?10 and ?30‰ can be attributed to variable organic matter oxidation pathways, methane oxidation, and carbonate rock buffering. Identification of ¹³C‐rich calcite provides unambiguous evidence of biogenic methane generation and may be used to identify gas deposits in other sedimentary basins. It is likely that repeated glacial advances and retreats exposed the Antrim Shale at the basin margin, enhanced meteoric recharge into the shallow part of the fractured reservoir, and initiated multiple episodes of bacterial methanogenesis and methanotrophic activity that were recorded in fracture‐fill cements. The δ¹⁸O values in both formation waters and calcite cements increase with depth in the basin (?12 to ?4‰ SMOW, and +21 to +27‰ PDB, respectively). Most fracture‐fill cements from outcrop samples have δ¹³C values between ?41 and ?15‰ PDB. In contrast, most cement in cores have δ¹³C values between +15 and +34‰ PDB. Radiocarbon and ²³⁰Th dating of fracture‐fill calcite indicates that the calcite formed between 33 and 390 ka, well within the Pleistocene Epoch.