Data integration using knowledge driven GIS modeling for Cu and Pb deposits
Tarik. B. Benomar , Bassam Al Bassam, Guangdao hu
Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, China
School of Environmental studies, China University of Geosciences, Wuhan 430074, China
Abstract
Mineral resource potential mapping is a complex analytical process, which requires consideration and integration of a number of spatial evidences like geological, geomorphological, wall rock alteration. The aim of this study is to establish mineral exploration model for Copper Lead in Lanping basin area, using the capability of analytical tools of Geographic Information System (GIS) and remotely sensed data to generate maps showing favorable mineralized area.
The geo-exploration data set used for the research includes Copper Lead deposits, geological maps, topographic maps, structural maps, and ETM+ imagery. Geological features indicative of Cu, Pb, potential were extracted from the data sets for use as inputs in the predictive model. Host rock and deep faults were derived from geological map. Hydrothermal alteration zones and lineament features were derived from ETM+ image data.
Weights of evidence modeling method is a probability-based technique for generating mineral potential maps using the spatial distribution of indicative features with respect to the known mineral occurrences. In the study area the indicative features have been identified for Cu, Pb ore deposits depending on the geological and mineral characteristics, which are hydrothermal zones structural, lithological features. the weights of evidence probabilistic modeling provides a quantitative method for delineating areas with potential to Copper Lead mineral deposits in the Lanping basin area; The distribution of 22 (Copper Lead) occurrences in the Lanping Basin was examined in terms of spatial association with various geological phenomena. The analysis of these relationships, using GIS and weights of evidence modeling, has predicted areas of high and moderate mineral potential where a little or no mining activities are exist.
Introduction
China is one of the third richest country in the world of mineral resources with a total potential value of 11 trillion US$. Mineral resource potential mapping is a complex analytical procedure, which require simultaneous consideration of a number of spatial evidence such as geomorphological, structural, geochemical geophysical, etc. the capability of Gis to manipulate such classified spatial information through amalgamated layers make it a unique tool for delineating potential locals . Ability of GIS is to integrate and combine multiple layers of geosciences data into predictive mineral potential maps showing areas favorable for mineral exploration .
The analysis of spatially located data is one the basic concerns of exploration geologists, and can be more efficiently executed with assistance of Geographical Information Systems (GIS). One of the major applications of a GIS is the ability to integrate and combine multiple layers of lithology, structure, geophysical and geochemical characteristics to delineate mineral prospectivity maps. Geographical Information System (GIS) has potential for storing, updating, retrieving, displaying, processing, analyzing and integration of different geo-spatial data. In order to overcome difficulties such as: large mass of data, existence of data in the analogue form, non-existence of standards and related directions for collecting, managing and processing the data, different environments for storing and processing, non-existence of an environment for integrating data into conventional models in mineral deposit exploration, using of GIS is essential. In this study a GIS-based spatial analysis were applied to build maps showing areas favorable for lead-zinc deposits in the Lanping basin (Yunnan- china).