Bleached mudstone,iron concretions,and calcite veins: a natural analogue for the effects of reducing CO2‐bearing fluids on migration and mineralization of iron,sealing properties,and composition of mudstone cap rocks

This study investigates the Wangfu Depression of the Songliao Basin, China, as a natural analogue site for Fe migration (bleaching) and mineralization (formation of iron concretions) caused by reducing CO₂‐bearing fluids that leak along fractures after carbon capture, utilization, and storage. We also examined the origin of fracture‐filling calcite veins, the properties of self‐sealing fluids, the influence of fluids on the compositions of mudstone and established a bleaching model for the study area. Our results show that iron concretions are the oxidative products of precursor minerals (pyrite and siderite) during uplift and are linked to H₂S and CO₂ present in early stage fluids. The precipitation of calcite veins is the result of CO₂ degassing and is related to CO₂, CH₄, and minor heavy hydrocarbons in the main bleaching fluids. In our model, fluids preferentially enter high‐permeability fracture systems and result in the bleaching of surrounding rocks and precipitation of calcite veins. The infilling of calcite veins significantly decreases the permeability of fractures and forces the fluids to slowly enter and bleach the mudstone rocks. The Fe²⁺ released during bleaching migrates to elsewhere with the solutions or is reprecipitated in the calcite veins and iron concretions. The formation of calcite veins reduces the fracture space and effectively prevents fluid flow. The fluids have an insignificant effect on minerals within the mudstone. In terms of the chemistry of the mudstone, only the contents of Fe₂O₃, U, and Mo change significantly, with the content of U increasing in the mudstone and the contents of Fe₂O₃ and Mo decreasing during bleaching.     

Preserving collective and individual memories: the Contemporary China Social Life Data and Research Center at Fudan University

This essay introduces the Contemporary China Social Life Data and Research Center at Fudan’s School of Social Development and Public Policy and the data the archive has collected. This archive contains data on Lianmin Village in northern Zhejiang Province that provide exceptionally detailed information on economic, political, social, and cultural changes during the period from 1949 to 2000 in China. The archive also collects information on life at the grassroots level, mostly from Zhejiang, Jiangxi, and Shanghai, including documents from local government offices and work units. Among the documents collected at the archive, the meeting minutes are especially noteworthy. The archive’s unique collection of private correspondence, personal diaries, and work logs is also enormously valuable to our understanding of contemporary Chinese society.     

Visions/versions of the war: Ramón Pérez de Ayala and Juan Pujol on the Italian front

In 1915, the Spanish journalist Juan Pujol visited the Italian front. His reports appeared in ABC, and were later incorporated in his book In Galitzia and the Isonzo (1916). A few months later, the Spanish writer Ramón Pérez de Ayala visited the same territories. His reports appeared in El Imparcial (Madrid) and La Prensa (Buenos Aires), and were later published in his book Herman in Chains (1917). The poetics evident in the reports of both writers were clearly different, not only for ideological reasons (Juan Pujol supported the Central Empires; Pérez de Ayala favored the Allies), but also for discursive reasons: the reflexive and digressive culturalism of Pérez de Ayala, for example, contrasted vividly with the direct narrative of Juan Pujol. However, since both writers shared some stereotypes about war and used a common repertoire of rhetorical and stylistic strategies, there are significant similarities between their texts.     

Isaiah b. Amoz’s Attitude towards the Faith of the Gentile Nations

This article discusses the pilgrimage of the nations to Zion described in Isa 2,2-5, focusing on Isaiah’s attitude to their future faith in the God of Israel. A number of ways of understanding Isaiah’s view are proposed on the basis of a series of ever-widening interpretive circles. These are determined by their linguistic and/or substantive and/or cognitive affinities with the vision, influencing the exegesis of the vision either through their content or the worldview they reflect. None of the circles entails a reading of the vision as a closed unit isolated from its context.     

北京石景山八角村魏晋墓的年代及墓主问题

石景山八角村魏晋墓是北京地区发现的一座出有特殊壁画石龛的重要墓葬。石龛出现的原因必与墓葬的时代背景及墓主人身份密切相关。本文从"晋制"演变发展的角度考察该墓墓葬形制和随葬品的年代范围,首先进一步研究充实魏晋都城洛阳地区"晋制"墓葬的演变序列和阶段性特点,然后以之为参照,建立北京地区魏晋墓葬的演变系统,从而认为该墓的年代为西晋晚期,下限可到十六国初期。石龛壁画的中心图像是执麈尾正坐的男墓主人,这一形象是改进东汉旧样后、创新于幽州地区的新图式,体现了与幽州鲜卑的文化联系。本文由此进一步推测,八角村墓墓主人为遇害于蓟城的西晋并州刺史刘琨,该墓为二次改葬墓,石龛为段部鲜卑单于供奉的祭龛。     

Fluid inclusion and stable isotope constraints on the genesis of the Jian copper deposit,Sanandaj–Sirjan metamorphic zone,Iran

The Jian copper deposit, located on the eastern edge of the Sanandaj–Sirjan metamorphic zone, southwest of Iran, is contained within the Surian Permo‐Triassic volcano‐sedimentary complex. Retrograde metamorphism resulted in three stages of mineralization (quartz ± sulfide veins) during exhumation of the Surian metamorphic complex (Middle Jurassic time; 159–167 Ma), and after the peak of the metamorphism (Middle to Late Triassic time; approximately 187 Ma). The early stage of mineralization (stage 1) is related to a homogeneous H₂O–CO₂ (XCO₂ > 0.1) fluid characterized by moderate salinity (<10 wt.% NaCl equivalent) at high temperature and pressure (>370°C, >3 kbar). Early quartz was followed by small amounts of disseminated fine‐grained pyrite and chalcopyrite. Most of the main‐ore‐stage (stage 2) minerals, including chalcopyrite, pyrite and minor sphalerite, pyrrhotite, and galena, precipitated from an aqueous‐carbonic fluid (8–18 wt.% NaCl equivalent) at temperatures ranging between 241 and 388°C during fluid unmixing process (CO₂ effervescence). Fluid unmixing in the primary carbonaceous fluid at pressures of 1.5–3 kbar produced a high XCO₂ (>0.05) and a low XCO₂ (<0.01) aqueous fluid in ore‐bearing quartz veins. Oxygen and hydrogen isotope compositions suggest mineralization by fluids derived from metamorphic dehydration (δ¹⁸O_fluid = +7.6 to +10.7‰ and δD = ?33.1 to ?38.5‰) during stage 2. The late stage (stage 3) is related to a distinct low salinity (1.5–8 wt.% NaCl equivalent) and temperatures of (120–230°C) aqueous fluid at pressures below 1.5 kbar and the deposition of post‐ore barren quartz veins. These fluids probably derived from meteoric waters, which circulated through the metamorphic pile at sufficiently high temperatures and acquire the characteristics of metamorphic fluids (δ¹⁸O_fluid = +4.7 to +5.1‰ and δD = ?52.3 to ?53.9‰) during waning stages of the postearly Cimmerian orogeny in Surian complex. The sulfide‐bearing quartz veins are interpreted as a small‐scale example of redistribution of mineral deposits by metamorphic fluids. This study suggests that mineralization at the Jian deposit is metamorphogenic in style, probably related to a deep‐seated mesothermal system.     

A New Energy Age in Pacific Russia: Lessons from the Sakhalin Oil and Gas Projects

A noted British specialist in Russia's economic geography and the Far East region presents a comprehensive account of the development of the onshore and offshore oil and gas deposits of Sakhalin. Following a review of early multinational activity in geological surveying and exploration during the 1970s, he charts subsequent changes in the entities formed to develop and exploit the deposits (Sakhalin-I and -II) later in the Soviet period and during the first two decades of Russian independence. These changes have responded to improved knowledge of the geology of the deposits and changing relations between the Russian central government and Sakhalin regional authorities. Also analyzed are efforts by the Russian side to overturn or otherwise modify terms of previous agreements deemed unfavorable, and maneuvering by China and Japan to secure increasing sources of supply for their markets. With Sakhalin's two core projects now entering the active production phase, the author distills a number of key issues that have shaped the development of the island's offshore hydrocarbon resources and will have a bearing on prospects for a future generation of less spectacular new projects (incremental development); he also outlines wider lessons that have been learned over the life of Sakhalin's projects. Journal of Economic Literature, Classification Numbers: F210, L710, L950, P330, Q400. 4 figures, 2 tables, 45 references.     

The environment as a life support system: the case of Biosphere 2

This paper studies an attempt to replicate the Earth’s biosphere in the second half of the twentieth century with the aim of preserving and refashioning the environment as a self‐reproducing ecological system. Ecosystems dynamics framed the planet Earth as a closed system and directed scientific attention to questions of global environmental management. The image of the Earth as a spacecraft and operable in a similar way supported ideas of placing the environment in a laboratory setting. Using the case of Biosphere 2, launched in the Arizona desert in 1983, this paper studies the images of nature and environment contained in this quest to create an ecosystem and human habitat as good as, or superior to nature on Earth (known in this context as Biosphere 1). The second biosphere was designed as ‘a prototype for a space colony’ that would eventually enable its deteriorating predecessor, the Earthly biosphere, to reproduce and allow human settler societies to migrate to other planets. The paper draws on the cultural history of the ship in Western culture and on ships and spaceships as archetypes of autarkic enclosures set apart from nature. It argues that Biosphere 2 as an example of a technologically controlled endosphere advanced an understanding of the environment as a ‘life support system’ that emphasized not completeness but systems integrity, and was based on principles of functionality and replaceability. The paper will explore how notions of biospheric life support shaped demands on the natural and social environments in Biosphere 2 and Biosphere 1.