Southwest Arabia During the Holocene: Recent Archaeological Developments

Recent fieldwork has considerably increased our knowledge of early Holocene settlement in Southwest Arabia. Neolithic settlement occurred within an environmental context of increased monsoonal moisture that continued during the mid-Holocene. A now well-attested Bronze Age exemplified by village- and town-scale settlements occupied by sedentary farmers developed toward the end of the mid-Holocene moist interval. The high plateau of Yemen was an early focus for the development of Bronze Age complex society, the economy of which relied upon terraced rain-fed and runoff agriculture. On the fringes of the Arabian desert, the precursors of the Sabaean literate civilization have been traced back to between 3600 and 2800 B.P., and even earlier, so that a virtually continuous archaeological record can now be described for parts of Yemen. In contrast to the highlands these societies relied upon food production from large-scale irrigation systems dependent upon capricious wadi floods. Bronze Age settlement, while showing some links with the southern Levant, now shows equal or stronger linkages with the Horn of Africa across the Red Sea. Although some regions of Yemen show breaks in occupation, others show continuity into the Sabaean period when a series of major towns grew up in response to the incense trade with the north. It is now clear that these civilizations grew up on the foundations of earlier Bronze Age complex societies.     

基于手机信令数据的长春市活动空间特征与社区分异研究

居民时空行为成为透视城市空间的重要视角,本文基于手机信令数据研究长春市活动空间及其社区分异,轮廓性的揭示居住空间、就业空间和消费休闲空间的分布规律,从人地互动的过程与格局的视角认识城市空间。研究发现,居住活动对中心城区依赖明显高于就业和消费休闲活动,就业活动呈现多中心连片发展格局,近郊的欧亚卖场和郊区的净月潭成为人们消费休闲活动的重要选择。就业-居住距离和消费休闲-居住距离的社区分异显著,折射出三类活动空间关系复杂,由此感知城市生活空间质量和社会空间结构。通过对社区分异的空间聚类分析明晰各地域自身问题,从而有针对性的对长春的空间调整优化和居民行为引导提出建议,构建和谐宜居的城市空间。     

Surface controls on the characteristics of natural CO2 seeps: implications for engineered CO2 stores

CO₂ injected into rock formations for deep geological storage must not leak to surface, since this would be economically and environmentally unfavourable, and could present a human health hazard. In Italy natural CO₂ degassing to the surface via seeps is widespread, providing an insight into the various styles of subsurface ‘plumbing’ as well as surface expression of CO₂ fluids. Here we investigate surface controls on the distribution of CO₂ seep characteristics (type, flux and temperature) using a large geographical and historical data set. When the locations of documented seeps are compared to a synthetic statistically random data set, we find that the nature of the CO₂ seeps is most strongly governed by the flow properties of the outcropping rocks, and local topography. Where low‐permeability rocks outcrop, numerous dry seeps occur and have a range of fluxes. Aqueous fluid flow will be limited in these low‐permeability rocks, and so relative permeability effects may enable preferential CO₂ flow. CO₂ vents typically occur along faults in rocks that are located above the water table or are low permeability. Diffuse seeps develop where CO₂ (laterally supplied by these faults) emerges from the vadose zone and where CO₂ degassing from groundwater follows a different flow path due to flow differences for water and CO₂ gas. Bubbling water seeps (characterized by water bubbling with CO₂) arise where CO₂ supply enters the phreatic zone or an aquifer. CO₂‐rich springs often emerge where valleys erode into CO₂ aquifers, and these are typically high flux seeps. Seep type is known to influence human health risk at CO₂ seeps in Italy, as well as the topography surrounding the seep which affects the rate of gas dispersion by wind. Identifying the physical controls on potential seep locations and seep type above engineered CO₂ storage operations is therefore crucial to targeted site monitoring strategy and risk assessment. The surface geology and topography above a CO₂ store must therefore be characterized in order to design the most effective monitoring strategy.     

Fluid mixing induced by hydrothermal activity in the ordovician carbonates in Tarim Basin,China

Permian hydrothermal activity in the Tarim Basin may have been responsible for the invasion of hot brines into Ordovician carbonate reservoirs. Studies have been undertaken to explain the origin and geochemical characteristics of the diagenetic fluid present during this hydrothermal event although there is no consensus on it. We present a genetic model resulting from the study of δ¹³C, δ¹⁸O, δ³⁴S, and ⁸⁷Sr/⁸⁶Sr isotope values and fluid inclusions (FIs) from fracture‐ and vug‐filling calcite, saddle dolomite, fluorite, barite, quartz, and anhydrite from Ordovician outcrops in northwest (NW) Tarim Basin and subsurface cores in Central Tarim Basin. The presence of hydrothermal fluid was confirmed by minerals with fluid inclusion homogenization temperatures being >10°C higher than the paleo‐formation burial temperatures both in the NW Tarim and in the Central Tarim areas. The mixing of hot (>200°C), high‐salinity (>24 wt% NaCl), ⁸⁷Sr‐rich (up to 0.7104) hydrothermal fluid with cool (60–100°C), low‐salinity (0 to 3.5 wt% NaCl), also ⁸⁷Sr‐rich (up to 0.7010) meteoric water in the Ordovician unit was supported by the salinity of fluid inclusions, and δ¹³C, δ¹⁸O, and ⁸⁷Sr/⁸⁶Sr isotopic values of the diagenetic minerals. Up‐migrated hydrothermal fluids from the deeper Cambrian strata may have contributed to the hot brine with high sulfate concentrations which promoted thermochemical sulfate reduction (TSR) in the Ordovician, resulting in the formation of ¹²C‐rich (δ¹³C as low as ?13.8‰) calcite and ³⁴S‐rich (δ³⁴S values from 21.4‰ to 29.7‰) H₂S, pyrite, and elemental sulfur. Hydrothermal fluid mixing with fresh water in Ordovician strata in Tarim Basin was facilitated by deep‐seated faults and up‐reaching faults due to the pervasive Permian magmatic activity. Collectively, fluid mixing, hydrothermal dolomitization, TSR, and faulting may have locally dissolved the host carbonates and increased the reservoir porosity and permeability, which has significant implications for hydrocarbon exploration.     

朝阳发现的北燕墓

近年来,为配合城市、厂矿企业的基本建设,经文物部门勘探,在朝阳市区内发现并发掘清理了大量的古代墓葬,其中包括三燕时期的墓葬.     

"民族志·民俗志的理论与实践学术研讨会"综述

2006年12月16日至17日,"民族志·民俗志的理论与实践学术研讨会"在北京师范大学成功召开.这次大会由北京师范大学文学院民俗学与文化人类学研究所、北京师范大学民俗文化普查与研究中心、北京民间文艺家协会联合主办.     

Book reviews—comptes rendus

Themes in Political History—Thèmes en histoire politique

Peter BLICKLE ed., Resistance, Representation and Community, Oxford University Press, Origins of the Modern State in Europe, 13th‐18th Centuries Series, Oxford, 1997, 401 pp. ISBN 0–19–820548–1. £50.00.

J. L. MERRITT ed., The Political World of Thomas Wentworth, Earl of Strafford 1621–1641, Cambridge University Press, Cambridge, 1996, 307 pp. ISBN 0–521–560–411. £40.00.

Themes in Napoleonic Studies—Etudes sur Napoléon

Malcolm CROOK, Napoleon comes to power: Democracy and Dictatorship in Revolutionary France, 1795–1804, University of Wales Press, Cardiff, 1998 ISBN 0–7083–1461–9 (hardback) £15.00, ISBN 0–7083–1401–5 (paperback) £7.95.

Christopher PRENDERGAST, Napoleon and History Painting. Antoine‐Jean Gros's La Bataille d'Eylau, Clarendon Press, Oxford, 1997, xiv + 223 pp., ISBN 0–19–817402–0 £45.00.

Matthew TRUESDELL, Spectacular Politics. Louis‐Napoleon Bonaparte and the Fête Impériale, 1849–1870, Oxford University Press Oxford, 1997, viii + 238 pp., ISBN 0–19–510689‐X £35.00.

Themes in Twentieth‐Century History—Aspects de l'histoire du vingtième siècle

Götz ALY, Macht‐Geist‐Wahn. Kontinuitäten deutschen Denkens, Argon, Berlin, 1997, 220pp., ISBN 3–87024–361–9.

Holger H. HERWIG, The First World War: Germany and Austria‐Hungary 1914–1918, Modern Wars, Arnold, London, 1997, xx + 490 pp. ISBN 0–340–67753–8 (hb), 0–340–57348–1 (pb) £16.99.

Lonnie R. JOHNSON, Central Europe: Enemies, Neighbours, Friends, Oxford University Press, Oxford, 1996, xi + 339 pp., ISBN 0–19–510071–9 (hardback) £27.00. 0–19–510072–7 (paperback) £15.00.

Iwao Peter SANO, One Thousand days in Siberia: The Odyssey of a Japanese‐American POW, University of Nebraska Press, Lincoln and London, 1997, xvii + 210pp., ill., ISBN 0–8032–4262‐X £23.95.

Martin THOMAS, Britain, France and Appeasement: Anglo‐French Relations in the Popular Front Era, Berg, Oxford, 1996, x + 268pp., ISBN 1–85973–192–9 £29.95 and £12.95.     

贵州最早的骨制装饰品

贵州最早的骨制装饰品出自距今一万二千年至一万五千年前的普定白岩脚洞旧石器时代晚期遗址。装饰品有1件骨笄和1件穿孔兽牙。它们是贵州的首次发现,也体现了贵州远古人类最早的爱美意识。从装饰品本体携带的信息,探索其制作技能,反映出当时人类加工技术的复杂和进步,即对不同用途的装饰品采用不同的加工方式和对同一制品的制作技术逐步改良的处理能力。这既是思维进化指导行为的结果,亦是原始人类迈向更加文明时代的一大进步。