Zhao Lianfeng Yan ZhongQiong Zhu JieShou

(Chengdu University of Technology 610059)

Abstract: This paper deeply analyzes the anomaly distribution laws of electric and magnetic parameters and builds a quick, economical and practical software system on the magnetic mise-à-la-masse method, and deduces the current partial theory fruits into applied field.

Under windows 98 operating system, recur to principle of engineering software programming and the object-oriented design method, we develop a utilized software system of the magnetic mise-a-masse method. The software system of the low frequency mise-à-la-masse method is proved effective by its application in Xiasai multi-metal diggings and LongHua BeiChaGou diggings.

Keywords: Low frequency magnetic mise-à-la-masse, Electric and magnetic parameters

Inversion, Software system, Application

2. 邮2盘11有格式问题等邮件

3. Noise Suppression on Field Data of Time Spectral Resistivity Method

Chang yanjun Luo yanzhong

(China University of Geosciences, Wuhan, 430074, P.R.China)

Time spectral resistivity (TSR) method is a new branch of the electrical prospecting method. It uses the same configuration as the spectral induced polarization (SIP) method or complex resistivity (CR) method in frequency domain, and observes the transient step-off responses of the electric field component. It studies the characteristic of the electric field when the electromagnetic (EM) and IP effects exist simultaneously.

In the field data of TSR method, various noises are involved. It is necessary work to suppress these noises. First, the effect of quelling the random noise is studied in the paper, based on the quadratic linear filtering method and the median filtering method. After that, recursive filtering method and adaptive filtering method are used to quell industrial noise, and the filtering effects are analyzed and compared. At last, a set of filtering procedure for reducing noises and increasing the ratio of signal to noise is formed, which can be tried out on the field data.

4． Construction of regional rock density model

and geological meaning in Anhui

Chen you ming Dai feng

Abstract:Through the statistic analysis of the data of 17750 rock samples density, we basically understand its regional character, the effect element and the rule of change. Following the certain rules, we build four density models of geologic units in Anhui, which are Huabei,Yangzi, Beihuaiyang and Wannan. We have summarized the character of the structure, the meaning in application of exploring mine and the geologic research.

5． The relations between gravity and magnetic field features,

structure and ore in the south of Anhwei

WANG Xiaoying WANG Jianwei

The results of 1:200000 regional gravity and aeromegnetic survey in southern Anhui shows that this area is changed continental crust produced by collision and mosaicking between Yangtze plate and Cathaysia massif. The northern part of southern Anhui belongs to ancient Yangtze continental margin and There is a magnetic crystalline basement (Ar～Pt₁) under sedimentary mantle; The southern part is a mosaicking area broken massif (Pt₂) in marginal sea. There were two large tectonic movements in the geologic history of southern Anhui: the end of proterozoic Era the ancient Yangtze continental margin came into collision with dissociative massif in marginal sea and made continental margin expand towards the south-east and produced volcanic arc along the boundary between Anhwei and zhejang; The tectonic movement in Mesozoic made this area form strong deformation of the earth’s crust. There exists perspective of looking out ore in the conjunct places of different massif and there are different useful minerals and genetic types of mineral deposits in the different geotectonic elements.

6．The collisional orogenic belt at the juncture of Anhui-Zhejiang-Jiangxi provinces Moho character analysis

Liu Tong-qing，Gao Ergen et.al

The collisional orogenic belt at the juncture of Anhui-Zhejiang-Jiangxi provinces Moho character analysis·Liu Tong-qing，Gao Ergen et.al. Anhui Geology Survey institute ·Hefei· 230001.

The collisional orogenic belt at the juncture of Anhui-Zhejiang-Jiangxi provinces is a researching hotpoint zone recently, many opinions concerning with tectonic evolution and forming times still exist many questions．In this paper we calculate the Moho depth contour line．Attemptimg to，from another hand，analyze and discuss the forming times and attribute of the collisional orogenic belt by analysing of structure and character of deep geophysics field and Moho．We point out the orogenic movement underwant two steps:early subduction stage and late collision stage.The times of the collisional orogenic belt could be about in the end of late Proterozoic.

7． The Application of Aero-geophysical Survey in Geological Mapping of Yamansu Area in Xinjiang

Liang Yueming Huang Xuzhao

Aero Geophysical Survey & Remote Sensing Center

The Ministry of the Land & Resources Beijing 100083

Taking geological mapping of Yamansu area in Xinjiang for example, this paper described the aero-geophysical effect on regional geological investigation. Based on gravity,aero-magnetic and aero-electromagnetic linear gradient feature and different aero-spectrometry total account,kangguertage fault covered with the Quaternary system seriously was distinguished. And also its nature and controlling effect on mineralizing were studied.Based on the difference of aero-spectrometry total account,the feature of aero-magnetic and gravity, the lithofacies zones of large intrusive rock were distinguished.Based on intensity and shap of aero-magnitic field and residual gravity anomaly,the hidden intrusive masses were enclosed. Based on the feature of aero-magnetic field and the statistical result of aero-spectrometry total account,the layeres of different rock unit were distinguished.