Polyphasic hydrothermal and meteoric fluid regimes during the growth of a segmented fault involving crystalline and carbonate rocks (Barcelona Plain,NE Spain)

A polyphasic tectonic‐fluid system of a fault that involves crystalline and carbonate rocks (Hospital fault, Barcelona Plain) has been inferred from regional to thin section scale observations combined with geochemical analyses. Cathodoluminescence, microprobe analyses and stable isotopy in fracture‐related cements record the circulation of successive alternations of hydrothermal and low‐temperature meteoric fluids linked with three main regional tectonic events. The first event corresponds to the Mesozoic extension, which had two rifting stages, and it is characterized by the independent tectonic activity of two fault segments, namely southern and northern Hospital fault segments. During the Late Permian‐Middle Jurassic rifting, these segments controlled the thickness and distribution of the Triassic sediments. Also, dolomitization was produced in an early stage by Triassic seawater at shallow conditions. During increasing burial, formation of fractures and their dolomite‐related cements took place. Fault activity during the Middle Jurassic–Late Cretaceous rifting was localized in the southern segment, and it was characterized by hydrothermal brines, with temperatures over 180°C, which ascended through this fault segment precipitating quartz, chlorite, and calcite. The second event corresponds to the Paleogene compression (Chattian), which produced exhumation, folding and erosion, favouring the percolation of low‐temperature meteoric fluids which produced the calcitization of the dolostones and of the dolomite cements. The third event is linked with the Neogene extension, where three stages have been identified. During the syn‐rift stage, the southern segment of the Hospital fault grew by tip propagation. In the relay zone, hydrothermal brines with temperature around 140°C upflowed. During the late postrift, the Hospital fault acted as a unique segment and deformation occurred at shallow conditions and under a low‐temperature meteoric regime. Finally, and possibly during the Messinian compression, NW‐SE strike‐slip faults offset the Hospital fault to its current configuration.     

宁绍地区早期遗址群的量化分析

宁绍地区早期遗址群的时空变化是钱塘江以南聚落考古研究的重要课题。本文全面收集了这一地区的考古资料,着重从量化分析的角度,对距今7000～3000年间的遗址进行了考古地理学考察。在提取高分辨率年代序列的基础上,绘制出多幅遗址群分布地图,初步恢复性重建了宁绍平原考古时代的聚落群景观。     

Possible evidence of mammoth hunting during the Epigravettian at Yudinovo, Russian Plain

Whether or not mammoth hunting was practised during the Late Palaeolithic has been a controversial issue ever since large accumulations of woolly mammoth bones associated with prehistoric artefacts were discovered more than 100 years ago. Detailed taphonomic and palaeobiological analyses of the mammoth bone complexes from the Epigravettian Yudinovo site in the Russian Plain were carried out. The combination of the homogeneous weathering rate of the mammoth bones, the isolated state of most of the skeletal elements, the restricted spatial range of the carnivore gnawing traces, the breakage pattern of the skulls and long bones, the sex ratio, the small body size of the adult mammoths, the age profile (with an important frequency of prime-aged cows), and the large number of individuals, suggest that the bone complexes at Yudinovo were constructed from body parts and bones that were extracted from freshly killed mammoths and that mammoth hunting was practised at this site during the Epigravettian.     

Reconstructing subsistence at the Yingpanshan and Gaoshan sites in Sichuan province,China: Insights from isotope analysis on bone samples and charred crop remains

During the Neolithic period, the Chengdu Plain was a key region where two important crops, rice and millet, were cultivated together. Millet was probably introduced from north-western China c.3500–3300 cal. bce , and rice came from the Middle Yangtze River c.2600 cal. bce . In this study, human and faunal remains, as well as charred crop grains, were collected from the Yingpanshan (3300–2600 cal. bce ) and Gaoshan (2500–2000 cal. bce ) sites where the dominant crop was millet and rice, respectively. Carbon and nitrogen isotope analyses were conducted on human bones and the ecofact samples in order to reconstruct the subsistence at the sites. The results indicate that the diets of two individuals recovered from the Yingpanshan site consisted of both C₃- and C₄-based foods, predominantly the former. By contrast, Yingpanshan pigs consumed a large quantity of C₄ fodder. This result, combined with the ecofact evidence, suggests that millet was the main crop at the Yingpanshan site. It also highlights the fact that the two Yingpanshan individuals might be non-locals and/or belonged to later periods. On the other hand, the diet of the Gaoshan community was dominated by C₃-based foods. When considering the archaeobotanical evidence at Baodun, a site contemporaneous with and near to the Gaoshan site, it can be stated that rice was an important food resource for the Gaoshan community. This study also suggests how crops were managed at the two sites. The Yingpanshan people might have used manure for growing millet. Both manuring and irrigation might have also been practised by Gaoshan's rice farmers. However, more studies are required to understand the extent of manuring and irrigation in their agricultural economies.     

晋中平原地区农村聚落扩展分析

在实地考察的基础上，章从规模、速度、形态和类型等方面分析了晋中平原地区农村聚落扩展的特点，并深入探讨了影响农村聚落扩展的因素，认为聚落扩展主要是人口增长和家庭规模变化、社会经济发展与收入增加、交通条件改善、农村地区工业化及其他因素共同作用的结果。最后指出了由于聚落扩展而带来的许多难以解决的问题。     

从三峡地区与东部平原的对比看考古学文化中的环境因素

三峡地区与东部平原的不同地理环境,导致了峡区和平原地区的考古学文化的差异。古代人类对不同地理环境适应的结果,是反映在考古学文化中的环境因素。     

楚人源于关中平原新证——以清华简《楚居》相关地名的考释为中心

楚人(族)的起源地及其迁徙路线问题,是一个长期困扰楚史研究者的艰难研究课题。清华简《楚居》的面世,为该问题的解决提供了可能。本文在既有楚人源于关中平原观点的基础上,指出《楚居》12个早期地名皆在今陕西省境内:"畏阝山"即蒉山,在蓝田县境;"穴穷"即镐京,在西安市西;"乔山"即峣山,在蓝田县与商州区之间;"爰陂"即原陂,在蓝田县境;"汌水"即灌水,今赤水河;"方山"即华山,今华山山脉;"盘"即蕃,"京宗"即郑荆,皆在华县境;"哉水"即兹水,今灞河;"屈"即冢,今商州区境;"鄀"即上鄀,在洛河、丹江上游;"夷屯"即丹阳,今商州区境。这些地名位置的落实,为楚人源于关中平原的观点提供了新的证据,为楚文化之谜的破译奠定了新的历史地理基础。     

鸱尾起源考

当前,学术界对鸱尾起源问题的研究,主要有三种观点。第一种观点为西汉起源说。持此观点的学者为著名建筑史学家刘敦桢和吴庆洲[1]。刘敦桢最先提出鸱尾创于西汉[2],其主要依据为《陈     

江汉平原农户日常消费空间演变及影响因素研究

消费空间变化是透视当代乡村地域系统演变的重要视角.基于江汉平原公安县农户抽样调查和实地访谈数据,以微观分析描绘农户消费场景变化、宏观分析勾画农户消费空间演变,以多元线性回归解析乡村消费演变影响因素.研究表明:①微观上,农户消费区位频次趋于增加、区位类型趋于分化,低等级商品消费向低等级购物地扩散、高等级商品消费向高等级购...     

Cyclic Response of Concrete Beams Reinforced by Plain Bars

There are many reinforced concrete structures throughout the world that have been built in the past decades that lack appropriate seismic details and reinforced by plain bars. To study the behavior of such buildings, seven beams have been tested under cyclic and monotonic load. The specimens include substandard specimens, with deficient seismic details and reinforced by plain bars, specimens designed in accordance with ACI-318-99 but reinforced by plain bars, and standard specimens reinforced by deformed bars. The tests indicate that the substandard specimens sustain relatively large slip of longitudinal bars, separation of specimen relative to foundation and sliding at large deformation phase, low initial stiffness ratio, limited lateral displacement capacity, and loss of nominal yield strength. The specimens reinforced by plain bars in accordance with ACI-318-99 perform almost similar to standard specimens with deformed bars, in terms of elastic stiffness and lateral displacement ductility; but, they sustain larger slip, and smaller yield strength. Failure of all specimens reinforced by plain bars is characterized by flexural cracks without visible shear failure. Residual shear strength of substandard specimens is modeled by dowel action of longitudinal bars to predict a lower limit for lateral strength of the specimens.