Geophysical Model And Its Application Research In Jinding Lead-zinc Deposit

The area of "sanjiang" in southwestern China with excellent geological metallogenetic conditions, is the nonferrous metal resource aggregation place in our country, and it has become one of the hottest research area in domestic and international mineral exploration. But due to complexity of the geologic conditions of the area, The systematicness and theories of geological origin, metallogenic mode, geological and geophysical model are lack of research which lead to the area's mineral resources not favorable match the ore-forming geological conditions, so the author select Jinding ore bed to do researches by building geologic and geophysical models, the study provide geophysical basis for study of geological scientists in Jinding Lead-Zinc from the standpoint of geophysics. Because there are no such researches on the Jingding mineral deposit before, the studies not only have important significance to ore bed formation and geophysical research but also have a promotion of geophysical method.This paper rely on "Southwest'Sanjiang'south section of copper, lead, zinc, gold polymetallic deposit exploration and evaluation of law and Comprehensive Study" project (2006BAB01A07) of the topic "' Sanjiang'south section of copper-gold metallogenic belt polymetallic deposits exploration and evaluation combination of technical methods "project. This paper, based on the combination of the geological mineralization model theory and previous large amounts of geological, geophysical exploration information, we construct geological and geophysical models of Jinding lead-zinc deposits. Numerical simulations of DC, IP, CSAMT and gravity of these Jinding lead-zinc deposits models are proceeded by using self-adaption, vector finite element and finite-infinite element coupling method. Based on these Numerical simulations, the geophysical characteristics of the deposits are analyzed, the geophysical exploration methods and techniques for the deposits are selected, and some prospecting thinking and mode for such deposits are achieved.In the field data acquisition work of CSAMT geophysical exploration, according to the geology and topography conditions and interference distribution of the mine area, we take a number of corresponding technical methods and measures to guarantee the data quality. The two-dimensional and three-dimensional electrical structure characteristic of Jinding lead-zinc deposits are revealed by data processing, analysis, inversion and interpretation. Several kinds of inversion results by different methods are contrasted and the NLCG (Nonlinear Conjugate Gradient) results are chose as the final geologic interpretation base, a number of structure and lead-zinc ore body information are discovered in deep part of different section.At last, we provide a thinking direction, a mode and procedure of minerals prospecting of Jinding lead-zinc and the similar deposits.At the last part of this paper, the author makes a summary of the whole thesis and point out the deficiencies and suggestions for the further research.