The Geo-imaginaries of potential in Mexico's Burgos Basin

In this paper, we use the geo-imaginary analytic to show how actors utilized narratives of resource potential and speculative economic futures for the Burgos Basin in northeastern Mexico to affect a broader liberalization of the nation's hydrocarbon sector. Our research traces the history of the word “potential” as a discrete and repetitive rhetorical technique used variously to speculate on hydrocarbon production, economic development, regional energy development, and risks associated with the Burgos. We also identify an array of visualizations, what we refer to as ‘conjurings,’ used with narratives of potential to encourage investments in the Basin's development. These include: maps depicting Burgos geologic continuity with productive Texas fields, quantitative forecasts of growing production, visual depictions of private firms facilitating future production, and fracking as a necessary wedge to pry open the Burgos' unrealized potential. Finally, using governmentality, we link Burgos potentiality discourses to socio-political outcomes, including in the early 2000s, when the Basin was imagined as a way to counterbalance the skyrocketing costs of imported natural gas, continuing with the 2013–2014 Reforms, and into the post-Reform oil and gas conference spaces that facilitated financial investing opportunities. We also argue that the current administration leveraged anti-fracking discourse to reverse the liberalization of Mexico's hydrocarbon sector. By drawing together overlapping elements from scholarship into resources, speculation, and governmentality, and by parsing the ways that potential narratives and conjuring tools are deployed, this research contributes to ongoing debates in political geography around natural resources and the geopolitics of the subsurface.     

Radiocarbon Chronology of the Siberian Paleolithic

We have compiled 462 C-14 determinations for 120 Paleolithic and Mesolithic sites from Siberia and the Russian Far East. The Mousterian sites are dated to ca. 46,000–28,500 BP. The Middle–Upper Paleolithic transition dates to ca. 43,300–28,500 BP. Although there are a few earlier sites, most of the Upper Paleolithic sites are dated to the time interval between ca. 34,000 BP and 10,000 BP. The earlier Upper Paleolithic stage is characterized by macroblade technology and is radiocarbon-dated to ca. 34,000–20,000 BP. The earliest microblade technology occurs in the late stage of the Upper Paleolithic, dated to ca. 23,000–20,000 BP, but the majority of microblade sites is dated to ca. 20,000–11,000 BP. The Final Paleolithic (Mesolithic) sites date to ca. 12,000–6000 BP. At ca. 13,000–11,000 BP, the earliest Neolithic appeared in both the Russian Far East (Amur River basin) and the Transbaikal. The Paleolithic–Neolithic transition occurred ca. 13,000–6000 BP.     

Transnational Constructors of Parliamentary Democracy in Swedish and Finnish Constitutional Controversies, 1917–1919

During the First World War, the legitimacy of established polities was challenged everywhere in Europe. Not only the combatant great powers but also smaller states witnessed a resurgence of constitutional disputes and competing ideological conceptualizations of revolution and reform, the will of the people, democracy, and parliamentarism. While these controversies primarily focused on the future of the national polities concerned, historical experiences and discourses accelerated by the war and the Russian Revolution were transnationally interconnected and contributed to discursive transfers between political cultures. Swedish and Finnish socialists were linked by their internationals, liberals were connected by transnational debates for and against ‘Western’ democracy and parliamentarism, and conservative politicians and academics were involved in ideologically oriented networks. This article reconstructs transnational links and discourses in order to understand the exceptionally confrontational dynamics (which, in Finland, partly led to a civil war) and the outcomes of the Swedish and Finnish constitutional debates in 1917–1919. It examines the nature of the transnational connections of eight Swedish and Finnish conservatives, liberals, revisionist socialists, and far-Left socialists, analysing their argumentation on constitutional questions in published works and parliamentary speeches as illustrative examples of the political groups they represented.     

The Science of Empire: Darwinism,Human Diversity,and Russian Physical Anthropology

Summary : The article explores deployment of the Darwinian narrative of the “natural history of humanity” in Russian physical anthropology in the late nineteenth to the early twentieth century. It traces two narratives developed by the leading Russian school of physical anthropology: one narrative advanced a universalist vision of collective scholarly enterprise working toward clarifying the missing links in the a priori accepted developmental evolutionary model. The other constructed a new language that undermined the idea of species/subspecies/races/nations/ as stable, externally bounded, and internally homogeneous units and attempted to rationalize imperial hybridity. The article's main focus is on the latter classificatory narrative, its relational methodology, and the protostructuralist units of comparison that it produced.     

中国俄国史研究百年检视与思考

中俄交往始于蒙古西征和金帐汗国时代(1238-1480年),中国学人撰写俄国史自1878年刊印的鹭江奇迹人的《俄国志略》,到今天已经有整整140年的历史。中国的俄国史学科伴随民族命运、国家危机以及世界形势的变化而生,自诞生之日起即负有学人情怀、民族重任和学术职责三重使命。因此,俄国史学科在中国一直发挥着“知夷”和“盗火”的两大作用。中华人民共和国成立后,俄国史(包括苏联时期和俄罗斯联邦时期)研究获得了70年的巨大发展,主要成就有:1985年中国苏联东欧史研究会成立(1992年英文更名为中国俄罗斯东欧中亚史研究会),高等院校、社会科学院、党校、国家有关部委及党政机构纷纷设立俄国史或俄罗斯问题研究机构,建立了从历史学学士、俄国史硕士到俄国史博士的三级专业人才培养体系,俄国史和俄罗斯问题研究的专业期刊创立并连续出版,大量的俄国通史、中俄(中苏)关系史、专题著作、各类教科书、翻译著作(来自俄文、英法、法文、德文、波兰文等)出版,中国俄国史学者积极参与国际学术会议和国际合作研究,具有中国特色的中国“俄罗斯学”新学科正在建立过程中。     

Role of compressive tectonics on gas charging into the Ordovician sandstone reservoirs in the Sbaa Basin,Algeria: constrained by fluid inclusions and mineralogical data

Structure‐ and tectonic‐related gas migration into Ordovician sandstone reservoirs and its impact on diagenesis history were reconstructed in two gas fields in the Sbaa Basin, in SW Algeria. This was accomplished by petrographical observations, fluid inclusion microthermometry and stable isotope geochemistry on quartz, dickite and carbonate cements and veins. Two successive phases of quartz cementation (CQ1 and CQ2) occurred in the reservoirs. Two phase aqueous inclusions show an increase in temperatures and salinities from the first CQ1 diagenetic phase toward CQ2 in both fields. Microthermometric data on gas inclusions in quartz veins reveal the presence of an average of 92 ± 5 mole% of CH₄ considering a CH₄‐CO₂ system, which is similar to the present‐day gas composition in the reservoirs. The presence of primary methane inclusions in early quartz overgrowths and in quartz and calcite veins suggests that hydrocarbon migration into the reservoir occurred synchronically with early quartz cementation in the sandstones located near the contact with the Silurian gas source rock at 100–140°C during the Late Carboniferous period and the late Hercynian episode fracturing at temperatures between 117 and 185°C, which increased in the NW‐direction of the basin. During the fracture filling, three main types of fluids were identified with different salinities and formation temperatures. A supplementary phase of higher fluid temperature (up to 226°C) recorded in late quartz, and calcite veins is related to a Jurassic thermal event. The occurrence of dickite cements close to the Silurian base near the main fault areas in both fields is mainly correlated with the sandstones where the early gas was charged. It implies that dickite precipitation is related to acidic influx. Late carbonate cements and veins (calcite – siderite – ankerite and strontianite) occurred at the same depths resulting from the same groundwater precipitation. The absence of methane inclusions in calcite cements result from methane flushing by saline waters.     

Carbon dioxide controlled earthquake distribution pattern in the NW Bohemian swarm earthquake region,western Eger Rift,Czech Republic – gas migration in the crystalline basement

The ascent of magmatic carbon dioxide in the western Eger (Oh?e) Rift is interlinked with the fault systems of the Variscian basement. In the Cheb Basin, the minimum CO₂ flux is about 160 m³ h^?1, with a diminishing trend towards the north and ceasing in the main epicentral area of the Northwest Bohemian swarm earthquakes. The ascending CO₂ forms Ca‐Mg‐HCO₃ type waters by leaching of cations from the fault planes and creates clay minerals, such as kaolinite, as alteration products on affected fault planes. These mineral reactions result in fault weakness and in hydraulically interconnected fault network. This leads to a decrease in the friction coefficient of the Coulomb failure stress (CFS) and to fault creep as stress build‐up cannot occur in the weak segments. At the transition zone in the north of the Cheb Basin, between areas of weak, fluid conductive faults and areas of locked faults with frictional strength, fluid pressure can increase resulting in stress build‐up. This can trigger strike‐slip swarm earthquakes. Fault creep or movements in weak segments may support a stress build‐up in the transition area by transmitting fluid pressure pulses. Additionally to fluid‐driven triggering models, it is important to consider that fluids ascending along faults are CO₂‐supersaturated thus intensifying the effect of fluid flow. The enforced flow of CO₂‐supersaturated fluids in the transitional zone from high to low permeability segments through narrowings triggers gas exsolution and may generate pressure fluctuations. Phase separation starts according to the phase behaviour of CO₂‐H₂O systems in the seismically active depths of NW Bohemia and may explain the vertical distribution of the seismicity. Changes in the size of the fluid transport channels in the fault systems caused, or superimposed, by fault movements, can produce fluid pressure increases or pulses, which are the precondition for triggering fluid‐induced swarm earthquakes.     

俄罗斯远东“中国移民问题”论析

在俄罗斯远东乃至全俄罗斯,“中国移民问题”是一个被有关势力上升到政治层面加以夸大、炒作的敏感问题。其主要肇因既有历史基因的复萌,也有现实利益的驱动。在其影响下,中俄两国开展劳务合作的潜力远未得到应有的发挥。近年来,俄虽有部分学者和政界人士能较为客观地分析中国移民问题,阐述利用中国劳务的必要性,且积极探讨利用中国劳务的有效途径,但俄罗斯社会对中国人持有的戒备和排斥心理仍相当浓厚。对此,我们应多从自身方面找原因,改进做法,积极应对,促使俄罗斯社会改变对中国人的偏见,从而将远东变成中俄合作真正的窗口和桥梁。