Based on the study of geological, geophysical and geochemical characteristics of the background field, ore district and ore belt that the Caijiaying ore deposit lies in, the authors have formulated the structural geological geophysical-geochemical-prospecting model,and summed up the optimum combinational process of geophysical and geochemical prospecting techniques.

Hydrochemical survey in four gold ore districts shows that the distribution of different forms in water exhibits regular variation in different regions and climate zones.This paper has preliminarily established distribution patterns of different forms of gold anomalies,thus providing grounds for hydrochemical prognosis of concealed ore deposits.

Radon measurement technique is a radiometric geophysical method in search for deep concealed deposits.In the Dafagou deposit of Tianwan,western Sichuan,gold mineralization is strictly controlled by shear zones and diabase dikes,and shear zones are closely associated with diabase dikes.Hence the application of radon measurement method to the search for shear zones and diabase dikes can achieve the aim of indirect prospecting for gold deposits.

Using three-dimensional tomographic imaging results of 2°×2°grid S wave velocity and 15′×15′ grid average gravity anomaly in North China,this paper adopted inversion with constrained least squares method and,as a result,obtained density distribution results of six bedding surfaces in lithosphere of North China.The inversion results indicate the following phenomena: the lithosphere density beneath North China area is extremely inhomogeneous,which is the reflection of the feature of violent tectonic movement;the density distribution is coherent with tectonic;the density is different in different tectonic units;there are low density regions in the crust;the strong earthquakes in North China region mainly occur at this depth.

The mantle-derivation theorists of diamonds hold that diamonds are formed at the bottom of the lithosphere and the top of the rheosphere,and the kimberlites or lamproites only serve as carriers for bringing diamonds out to form deposits.The gravity isostatic anomalies reflect not oly the tectonic activities at the depth of the earth crust but also the short term character of these activities.Hence special importance should be attached to the prospecting for young diamond-bearing rock bodies in Yuanjiang river area.

Based on aeromagnetic data,this paper has analysed and studied regional tectonic characteristics and evolution of Yingen Ejin Banner basin,affirmed the existence of NE-trending fault in this area,and probed into the role of the formation and development of this set of faults in regional tectonics.

Through wavefield transformation and transient electromagnetic field data of stratiform medium model under different conditions,the authors have raised the understanding of the physical significance of wavefield transformation of transient electromagnetic field and summed up some valuable regularities.It is pointed out that the wave field obtained from the mathematic trasformation not only satisfies wave equation in form but also exhibits “propagation” phenomenon in conductive media.In the process of “propagation”,the “reflection” and “transmission”phenomena also exist at the electric interface.These conclusions provide important theoretical grounds for reasonable utilization of the seismic processing and interpretation method.

Exemplified by ridge and valley topography and based on two dimensional finite element numerical simulation,this paper has given profile curves of primary electric field of near ore wallrock “mise a la masse” method and IP secondary electric field under the condition of rolling topography,studied the influence of topography upon the electric field,summarized distribution regularity of anomalies under the condition of rolling topography and,using radio method,made topographic correction.The results of the correction show that the effect is fairly satisfactory.

The key link of the geological radar detection technique is data collection.With practical engineering examples,this paper has probed into the influence of different geological radar surveying parameters on the effect of data collection,thus providing grounds for further detection with the purpose of raising detection quality.

This paper describes in brief the basic principle of geological radar technique and static rod in-situ test technique and, with practical examples, illustrates the application of combined geological radar and static rod test to the inspection of highway roadbed fill(quantity) and its effect.

With the development of petroleum exploration and exploitation,people are asked to obtain useful information from large quantities of new and old data as quickly as possible. The data bank technique provides the users with a high-performance storage and management system and safer rapid on-line visit so as to reduce the cost of storage and preservation of data, save the time of searching for data and help geologists to make decision in a better way.It supplies an economical and competitive service. This paper makes a comprehensive review on problems related to data bank technique.

Based on surface and borehole rock survey data,this paper has studied primary geochemical characteristics of the Ashele copper-polymetallic deposit,found out main indicator elements and their three-dimensional spatial distribution regularity,and established effective geochemical prospecting evaluation indices.Studies show that trace element contents of strata and rocks in the Ashele ore district are obviously higher than their contents in the metallogenic belt and their regional background,with their contents tending to increase from regional background through the metallogenic belt to the ore district.The surface primary anomalies of this ore deposit are in "planar"distribution along the mineralized zone,and the primary zoning of indicator elements exhibits the two layer structural model of volcanogene massive sulfide deposits characterized by Zn in the upper part and Cu in the lower part.

Based on the basic principle of reflection and transmission in the process of the propagation of logitudinal wave, this paper recounts a new theory and method for the application of pile body completeness inspection data with reflection wave method to the quantitative determination of apparent reflection coefficients and the round travelling time of reflection wave.