Arctic GIS Workshop Poster Abstract
GIS Technology for Arctic Geophysical and Geological Data Base
The software technology is developed on the basis of Oracle ODBC and unites hardware, software, and multi-aspect subject-oriented databases on geology and geophysics including data on composition of magmatic rocks for purposes of geodynamic and metallogenic analysis. The technology provides users with opportunity to form the attributive tables through voluntary quarries with crossing indices on various types of objects. In case, the data in tables have geographic coordinates, they could be adapted to wide spectrum of specialized digitized maps using ArcView. Beside of that, the tables could be used in the environment of popular processing software such as MS Excel, MS Access, Surfer, etc.
On the basis of developed technology, a GIS structure chart is created for the multi-purpose processing of huge data files containing multi-aspect geological information. The users get an opportunity to model objects and situations; the dialog language is quasi-natural; the consulting on specific and restricted problems is possible. Such a multi-contour system is able, at the analytical level, to adjust different informational models with reference ones, which sufficiently decreases the efficiency of scientific researches as a whole.
One of the important results of using the software technology is the revealing of specific Arctic MOR province which is located to the north of Charlie Gibbs fracture zone. Basalts of that province are analogous, by ratios of most Sr, Nd, and Pb isotopes, to basalts of well-known Southern Hemisphere DUPAL-anomaly, but, by 207Pb/204Pb and 206Pb/204Pb ratios, they correspond with normal MORB. The general dispersion of basalt composition in the Arctic province is subjected by mixing of the depleted mantle and PREMA component ("prevalent mantle" by Zindler & Hart, 1987), whereas the rocks from regions of most intensive anomalies of Iceland and Ian Mayen constitute the products of mixing PREMA and C component ("common" by Hanan & Graham, 1996).
The presentation is supported by the Russian Foundation for Basic Researches (grant 00-07-90000) and NATO SA (ESTCLG 975739).