菲律宾大马尼拉地区海水入侵研究分析

本文阐述了菲律宾大马尼拉地区的地貌、气候、水文、地质等背景情况；介绍区内的地下水质水介质类型及含水层发育情况、富水性和导水性、地下水水力性质、水化学特征和补排条件以及地下水的开采情况和需求量，从而分析了大马尼拉地区海水的机理。     

Temporal development of the 1999 intrusive episode in the Eyjafjallajökull volcano, Iceland, derived from InSAR images

Eyjafjallajökull volcano, located in southern Iceland, is characterized by its quiet nature. Only about a handful of earthquakes associated with the volcanic system had been detected prior to the 1990s. Earthquake swarms did, however, occur in 1994 and 1999. Here we investigate the spatio-temporal evolution of a magmatic intrusion associated with the 1999 earthquake swarm via analysis of produced surface deformation. A series of interferometric synthetic aperture radar (InSAR) images, spanning various periods of the intrusion, show that in 1999 surface deformation occurred mainly on the southern flanks of the volcano. The deformation amounts to more than 20 cm of range change. Inverse modeling resolves the deformation source to be a sill intrusion at 6.3 km depth. Sill opening was up to 1 m and the total intruded volume amounts to ～0.03 km³. The InSAR data display a migration of the center of deformation through time, enabling us to create time-dependant sill-opening models. Furthermore, we investigate the spatio-temporal distribution of earthquakes and find that the distribution supports the InSAR derived model and additionally provides indications for a possible site of a feeder channel. Magmatic flow-rate estimates indicate an initial intrusion rate of 4–6 m³/s, declining over a few weeks.     

关于1976年松潘地震成因的讨论

作者在前人研究的基础上,通过对1976年松潘7.2级地震的有关资料的分析,同时与海城地震和唐山地震进行对比,认为松潘地震及伴随该次地震而发生的各类现象是共出一因的,其成因可能与地壳内岩浆上涌有关.作者用岩浆的上涌力、热的发散及气体的逸出,对该次地震的发生、前兆及震后效应等现象作出了解释,最后对有关问题进行了讨论.     

Geothermal observations in east Liaoning and haicheng seismic area

We have obtained altogether heat flux data of 23 drill holes including 2 observational holes of thermal flow in the Haicheng seismic area. These data show roughly thermal structure of the crust in eastern Liaoning and in the Haicheng seismic area. The results indicate that there is higher value of heat flow in the belt north by east from Liaoyang to Xiongyue, the average thermal flux being 8.29× 10⁻²J/m²·s (2.0 hfu). The average thermal fulx in the Haicheng seismic area is 9.22×10²J/m²·s (2.2 hfu). Comparing with other known geophysical data of the Haicheng seismic area, we give a geophysical section of comprehensive interpretation. We suppose the low-velocity layer in the lower crust of the Haicheng seismic area is a result from intrusion of large-scale uper mantle substance. High temperature and low velocity mean that the layer has the nature of plastic mechanics. The focal region of the Haicheng earthquake is situated right in the upper part of that plastic layer. Obviously, this result is significant for studying the seismogenic process of the Haicheng earthquake and other intra-plate earthquakes. We attempt to emphasize that observation of heat flow is necessary for earthquake study. Gu Haoding did the actual writing.     

A subtropical water intrusion spring-event in the shelf-slope of the south-western Bay of Biscay after strong wind-forcing pulses

Two consecutive multidisciplinary surveys, covering the north and north-western part of the Iberian shelf and slope during spring 2000, showed a dramatic change in the oceanographic conditions as a result of a southern water intrusion that replaced shelf and slope waters down to 300 m depth. The intrusion covered an alongshore distance of ∼400 km from the north of Cape Finisterre to the centre of the Cantabrian Sea, and was developed in less than a month between the two occupations of the same area. The analysis of surface currents from several buoys moored over the slope allow us to associate the emerging oceanographic configuration after the event with a strong and well-defined slope current, although during winter 1999-2000 the entrance of the Iberian Poleward Current (IPC) in the Bay of Biscay was very weak. The rapid development of the intrusion is discussed in relation with the unusual strong wind forcing pulse that occurred between the cruises. Our results highlight the importance of variability scales below seasonal (event-scale) in the Iberian margin.     

红河车古铁金多金属矿矿化特征及成因探讨

红河县车古铁多金属矿为近期新发现的金矿点,通过矿区已发现的三处矿化体的综合研究,并与典型矿床进行对比,认为本区金矿化体均为热液成因。     

Changes in optical properties, chemistry, and micropore and mesopore characteristics of bituminous coal at the contact with dikes in the Illinois Basin

Changes in high-volatile bituminous coal (Pennsylvanian) near contacts with two volcanic intrusions in Illinois were investigated with respect to optical properties, coal chemistry, and coal pore structure. Vitrinite reflectance (R_o) increases from 0.62% to 5.03% within a distance of 5.5 m from the larger dike, and from 0.63% to 3.71% within 3.3 m from the small dike. Elemental chemistry of the coal shows distinct reductions in hydrogen and nitrogen content close to the intrusions. No trend was observed for total sulfur content, but decreases in sulfate content towards the dikes indicate thermochemical sulfate reduction (TSR). Contact-metamorphism has a dramatic effect on coal porosity, and microporosity in particular. Around the large dike, the micropore volume, after a slight initial increase, progressively decreases from 0.0417 cm³/g in coal situated 4.7 m from the intrusive contact to 0.0126 cm³/g at the contact. Strongly decreasing mesopore and micropore volumes in the altered zone, together with frequent cleat and fracture filling by calcite, indicate deteriorating conditions for both coalbed gas sorption and gas transmissibility.     

景宁地区变质岩划分及时代归属

景宁地区1：5万区域地质调查资料表明，该地区变质宕系实为不同时代和不同成因的产物。既存在中下元古代变质基底，相当于下元古界八都群，中元古界龙泉群及吕梁期侵入岩；也存在浅变质岩即中生代地层遭受热动力变质而成。原“鹤溪群”应予摒弃。