Sea ice plays an important role in the global climate system. The authors combined 3D GPR with drilling during China's second national Arctic research expedition. The interface of ice and sea water can be recognized clearly from the GPR section, consistent with the drilling result. 3D GPR Cube illustrates distinctly the underside morphology and the spatial spreading of inner structure of the Arctic sea ice. After additional calculation, some parameters, such as the upper and bottom surface areas and the volume of sea-ice, can be figured out and then serve as on-the-spot checkout data for the remote sensing and the data simulator. These data also provide the evidence and proof for the study of the formation mechanism and the course of dynamic effect of the sea ice.

Magnetotelluric (MT) data were obtained at 1007 sites along 21 profiles in the basin of Simao areas. Using data of effective apparents, the author got the inversion result of each line. The new analysis and realization of Simao Basin were based on magnetotelluric sounding. Jurassic (Pz) and metamorphic rocks (Upper Pt) characterized by lower apparents serve as indicator layers for the division of the structure layer. Except for the central uplifted area, the dual structure has the surface character of gradual descending from margin to center along the EW direction. In addition, the basement tectonics of Pz has some inheritance relation with the crystalline basement. Nevertheless, the limits and positions of local undulations show remarkable differences due to multi-stage tectonic movement.

Based on synthetic analysis of gravity, magnetic and seismic data as well as geological and drilling data of central southern Cangxian uplift, together with a comparison with the proved Dacheng coalfield, the authors hold that there exist a lot of coal seams and coal strata in this area. Although the buried depth of coal seams is relatively great, the distribution of the abundant resources is continuous and stable, indicating that further exploration is very valuable.

This paper deals with the data-processing technique as well as the principle and method of anomaly separation and combination. A practical example of borehole three-component magnetic survey shows that "separation" can give concrete layer information, and "combination" can simplify the interpretation work and make clear the spatial relationship between the anomalies. Satisfactory results can be obtained with the help of an integrated analysis of geological information.

An analysis of geochemical characteristics of the Wangpingxigou large-size lead-zinc deposit in Ruyang of Henan Province reveals that soil geochemical exploration is an effective means in search for lead-zinc deposits. The main economic lead-zinc ore bodies are on the whole confined within the outer margin of the Pb, Zn, Ag and Cu composite anomaly. Where the Pb values and Zn values of the ore-forming parent rocks are 2.5 times and 2 times higher than their respective Tu Hefei's and Venogradov's values of intermediate rocks, they can be regarded as the primary anomalies favorable for ore prospecting.

The Laowan gold ore belt is an important component part of the Tongbai-Dabieshan (northern slope) gold-silver metallogenic belt, and the Laowan gold deposit is one of the major deposits in this belt and also one of the important large-size metamorphic clastic rock gold deposits in China.Based on an analysis of geological,geophysical and geochemical characteristics of the Laowan gold deposit,the authors established the integrated ore-prospecting criteria and ore-prospecting model to guide the ore exploration and target-locating work.The ore-prospecting criteria and ore-prospecting model are of great reference value in further work.

The geochemical method serves as one of the effective means for geothermal and hot spring exploration. Exemplified by the Malinqiao low-temperature hot water, this paper explains the enrichment regularity of such trace elements as Hg, As and B, which play an obvious indication role in search for heat-conducing structures.

Abstract:It is suggested basic lava and intermediate lava constitute the volcanic rolcanic by the lithology and the testing of rare earth element in west Tianshan Mountains.They are all belong to calcic-alkalic series.Both of them have lower potassium and high sodium.The REE distribution patterns of the volcano indicate that they have a rich light REE.The curve is steep in light REE while relatively flat in heavy REE.All these characteristics reflect that the volcano was formed in the rift-valley environment.

Abstract: As there exist very complex geological structures in metallic ore districts, the seismic method for metallic ore exploration is a very complicated problem. However, the method is characterized by relatively great prospecting depth, less ambiguity and comparatively high precision. This paper deals with the experiment and application effects of the seismic method in the tracing of ore deposits based on bore hole data and the detecting of deep ore bodies, with the seismic exploration in the Bairendaba polymetallic deposit in Inner Mongolia serving as an example.

Aimed at solving the problem of exploring deep phreatic water, the authors advance a new method and the working principle for flow logging on the basis of a practical example. The technical superiority of this method and the calculation of parts of 下转232页hydrogeological parameters in the rock exploration area are given in this paper. The application of flow logging in two drilling holes played an important role in the evaluation of groundwater resource in these places.

LFMCW radar is capable of detecting subsurface anomalies by using linear sweep frequency transmission of a periodically repetitive continuous FM signal. However, limitation of traditional FFT algorithm confined the precision. In this paper, the MUSIC algorithm is given to improve the resolution and get more precise result, which has been proved by computer simulation. A comparison is made with experimental data.

In this article, 3-layers medium of horizontal sandwich model is established to simulate the anisotropy in horizontal well. Research the resistivity anisotropy in horizontal well by known resistivity information of vertical well, to get the real resistivity of the formation in horizontal well. The simulation results accord with the practical measure. Thereby, the practicability of the proposed method is validated to study resistivity anisotropy in horizontal well.

This paper presents a method that combines isostatic correction and residual negative correlation correction to remove the artificial anomaly of Tibetan Plateau caused by negative correlation between gravity anomaly and topography. With this method, the authors processed the gravity anomaly of the Hoh Xil area in Tibetan Plateau, and the result shows that this method is effective.

² abstract :Regional geochemical anomalies are possessed not only of certainty but also of randomness. Fractal technology as a non-linearity science could solve the related problems. In this paper, the authors used concentration-area fractal and perimeter-area fractal models to delineate geochemical anomalies. Based on a comparison between the two mathematical methods, the authors hold that the fractal method can yield better result than the traditional method.

With a phasor diagram of normalized in-phase and quadrature response for the half-space models of different conductivities and flying heights, a quick approximation of resistivity mapping algorithm is introduced. Also a inversing method called the centroid depth algorithm is offered, which makes it possible for fast inversing of FAEM data. Several examples of inversion results based on theoretical data and survey data are also discussed.

Wavelet transform (WT) has been widely used in many fields of data processing in that it can analyze the data both in time and in the frequency domain. The application of WT approach to seismic data processing has bright future, and hence further research into this field is of great value. This paper mainly discusses the thresholding methods in denoising of seismic data through WT approach. In addition, a hybrid strategy of combining WT with F-K filtering has been tried.

This article presents the plotting process of plane isoline map with hypsography, introduces the improtant effect of differential operator in geophysical exploration, at the same time , gives the real cases.

This article presents the plotting process of plane isoline map with hypsography, introduces the improtant effect of differential operator in geophysical exploration, at the same time , gives the real cases.

Based on systematic geochemical and synthetic analyses of oxides of the GS loesses on the northern slope of the Dabie Mountain, this paper deals with geochemical features of oxides and movement regularity of paleoclimate of this area in Middle Pleistocene.The total amount of silicon,aluminum and iron reaches 85％ in that area, and hence the authors hold that the climate has been mainly wet and hot from Middle Pleistocene till now in this area.From the distribution characteristics and movement regularity of oxides,it can be concluded that this area has experienced alternately eight times of warm and wet climate and the same times of dry and cold climate since Middle Pleistocene.Analyses of the ratios of oxides reveal that this area has experienced repeated remarkable changes from dry and cold to warm and wet,accompanied by several cycles of formation degree,eluviation and chemical weathering of soils.

In the study area, the composite effects of various natural and geological actions and human activities have resulted in the obvious nonequilibrium of the distribution of nutritional elements as well as toxic and harmful components in the surface layer soil. With the distribution of element contents in soil as the main data and on the basis of an analysis of the soil pollution situation and the enrichment or deficiency of the nutritional and beneficial elements in crops of Nanchang-Zhangshu area, this paper made an evaluation of the agricultural soil environment quality in this area, and classified the environment quality into four grades, which are in the worsening order A, B, C and D.

Airborne magnetic data was used to study complex geological structures in the Dali-Ruili area. The authors interpreted 81 faults, among which 48 were newly recognized. 18 faults have to do with the recommended scheme of the Da-rui Railway and are distributed at 21 related places. The discovery of these faults provides important basic data for the railway route selection.

Ferromagnetism substances in the pipe pile will be magnetized under the excitation of geomagnetic field, which changes the magnetic field around the pipe pile. Ferromagnetism substances can be regarded as a right cylinder, and magnetic field characteristics around the pipe pile were analyzed on combination with model piles' tests. Lengths of pipe pile under buildings were detected by the magnetic logging principle.Application examples indicate that it is effective to detect the length of the pipe pile under buildings with the magnetic logging principle.

In this paper, the authors deal with characteristics of the stress waves in the frequency area and the concord vibration. Through analyzing the data of several model piles and engineering piles, it is held that the inclination direction and tilting degree of the pile can be judged accurately on the basis of frequency area analysis.

The difference in the velocity of underground media elastic waves is closely related to the geotechnical mechanism characteristics of the media, and the Rayleigh wave velocity is very close to its shear wave velocity. Therefore, the application of the Rayleigh wave exploration technique to the stratification of the underground media has its obvious advantages. In the initial stage of the geotechnical engineering exploration, the Rayleigh wave technique can be used to divide strata and geological structures which have evident differences, whereas in the detailed exploration stage, this technique can be employed to detect the bedrock buried depth and the fill thickness. The application results are satisfactory.