雩山结合带及其非史密斯化过程

中国东南华夏板块的武夷山地块与罗霄地块之间存在一个非史密斯的地层带,称为雩山结合带.它是早古生代华夏板块与扬子板块拼贴过程中形成造山带的一个部分,自早奥陶世开始消减-中晚奥陶世主期挤压-中志留世伸展-晚志留世走滑四个阶段的非史密斯化过程.     

台湾现代主义诗歌的西化和民族化——以纪弦、余光中、洛夫为中心

在台湾现代主义诗歌发展进程中,"现代与传统"、"西方与东方"、"西化与民族化"始终是齐头并进交织在一起的,是一个冲突博弈互补的过程,只是不同时期强调的重点不同而已,不能简单地看作是"全盘西化"或"先西化后回归"。文章以纪弦、余光中、洛夫为中心,通过分析他们的诗歌观念和创作实践,深入透析台湾现代主义诗歌的西化倾向和民族意识。     

Book Review: Cavity Expansion Methods in Geomechanics. By Hai-Sui Yu. Kluwer Academic Publishers,Dordrecht, 2000, 385 pp., $170.00 (U.S.), ISBN 0-412-79990-1, (hb)

Mathematical Geosciences -     

北祁连造山带西段前造山期伸展构造特征—以肃北县鱼儿红地区为例

北祁连山是著名的加里东期造山带，以往地质研究主要集中在建造和主造山期板块俯冲－碰撞及陆内造山构造方面。作者通过在北祁连山西段区调填图，发现了一套基本顺层发育的拆离滑脱正断层，顺层韧性剪切带，流劈理及掩卧褶皱等，笔者对其构造样式，组合关系，运动学，动力学特征和相关建造的发育等进行了阐述，分析与讨论，认为它们是与前造山期裂谷盆地建造发育密切相关的同构造正断型伸构造群落。     

The knowledge rules of debris flow event: A case study for investigation Chen Yu Lan River, Taiwan

Debris flow, one of the most active hydrological processes, brings about a great loss of life and properties in the Chen Yu Lan River area, Nan-Tou County, Taiwan. The goal of this study is to manage and monitor the debris flows in a vast area. Thus, the strategy is to collect hydraulical and in-situ data easily and quickly through our spatial information system. Then, a novel Data Mining technique will be developed to find a rule-based knowledge system of debris flow. The entire study can be divided into two parts. In the first part, using spatial information the debris flow image is extracted from the outbreak area. The system provides precise positional information pertaining to the debris flow events. Attributes such as effective watershed area, Normalized Difference Vegetation Index (NDVI), and slope are automatically obtained from the system. In the second part of this study, K-mean theory is used to classify the observed hydraulical and in-situ data into different categories. Then, the ‘Effective Rough Set’ method is successfully used to analyze the factors influencing the debris flow phenomenon and delivers rational knowledge rules. The contribution of this study is presented that NDVI, slope and effective watershed area are the major factors influencing debris flow in the study area. The knowledge rules can provide better understanding on the elevation of high potential debris catchments.     

Comment on “Hydrolysis of neptunium(V) at variable temperatures (10-85 °C)” by L. Rao, T.G. Srinivasan, A.Yu. Garnov, P. Zanonato, P. Di Bernardo, and A. Bismondo

In a recent study [Rao, L., Srinivasan, T.G., Garnov, A.Yu., Zanonato, P., Di Bernardo, P., Bismondo, A., 2004. Hydrolysis of neptunium(V) at variable temperatures (10-85 °C). Geochim. Cosmochim. Acta68, 4821-4830.] the hydrolysis of Np(V) was investigated at 10-85 °C by absorption spectroscopy, potentiometry, and microcalorimetry along the titration of Np(V) solutions with tetramethylammonium hydroxide up to pH 10. However, there is strong evidence that the precautions to avoid competing reactions with carbonate were not sufficient and that the measured effects are not caused by the formation of Np(V) hydroxide complexes but primarily by the formation of Np(V) carbonate complexes. The reported equilibrium constants, enthalpies, entropies, and heat capacities for the complexes NpO₂OH(aq) and are severely in error and must not be used for the geochemical modeling of neptunium. If the hydrolysis constants reported by Rao et al. [Rao, L., Srinivasan, T.G., Garnov, A.Yu., Zanonato, P., Di Bernardo, P., Bismondo, A., 2004. Hydrolysis of neptunium(V) at variable temperatures (10-85 °C). Geochim. Cosmochim. Acta68, 4821-4830] are used to calculate neptunium solubilities in alkaline solutions relevant for nuclear waste repositories, the Np(V) concentrations are overestimated by orders of magnitude.     

F. I. Wolfson: Scientist,teacher, and patriot

Following a brief biography, the scientific, administrative, and educational activity of F.I. Wolfson is described. Also considered are the principal lines of his research: the study of the structures of ore fields and deposits, the geology of uranium deposits, the theory of hydrothermal ore formation, and the history of the study of ore deposits. The immense contribution made by Wolfson to the development of the mineral resources of the country (uranium, nonferrous metals, etc.) is shown and the continuing relevance of his theoretical and methodological works in the field of geology of ore deposits is emphasized.     

西藏冈底斯北缘尼玛地区帮勒村一带寒武纪火山岩LA—ICP—MS锆石U—Pb年龄及其地球化学特征

青藏高原南部中国境内是否存在寒武纪地层一直是地质界关注的焦点。研究表明．冈底斯北缘西藏尼玛县控错南帮勒村一带,原划的前震旦纪念青唐古拉岩群为一套浅变质的拉斑系列双峰式火山岩。通过高精度LA—ICP—MS（激光剥蚀等离子体质谱）锆石微区原位u—Pb同位素测年,获得其中变流纹岩“Pb／“u年龄加权平均值为（536．4±3．6）Ma,确定该套火山岩形成于 旱寒武世。地球化学分析表明,变玄武岩富集LREE、L1LE、部分HFSE,Nb、Ta、Zr、Hf等亏损,Zr／Nb比值（2．53～3．61）低;变流纹岩明显富集LREE、LILE、Th、HFSE,具有Eu负异常和sr、Nb、Ta、Ti负异常。同时,变玄武岩的gNd（t）为负值（一2．80~一4．56）。源区为富集地幔端元EMll。反映其源区为岩石圈和软流圈相互作用的产物,并遭受了地壳物质的混染。综合分析认为该套火山岩形成于陆缘裂谷环境．为冈底斯北缘存在寒武纪裂解作用提供了佐证。