Tectonic Evolution And Mineralized Pedigree In The Qinlin-Bashan Area Of Shaanxi Province

Following the theory of geological anomalies of mineralization and along the major guidelines of study on tectonic evolution and mineralized pedigree, the sequence of tectonic evolution and mineralized pedigree in this area has been created by means of GIS technique and historic analysis; Adoption of modern information treatment and analysis of geology, geophysical and geochemical prospecting and remote sensing methods has quantitatively delineated geological anomalies and potential areas of mineralization.Four tectonic evolution phases have been made out in this area. They are original crust formed in the Archean-Early Proterozoic era, continental crust shearing in the middle-new Proterozoic era, plate tectonic developed in Sinian-Triassic period and intracontinental orogeny in the Middle Cenozoic period. Detailed studies of tectonic unit and mineralized pedigree in each tectonic unit and each period provided that tectonic evolution passed an evolutionary sequence from early extension-transition-late compression that correspond to mineralization-sediment and submarine eruption-exhalation mineralization-moderate to acid magma and tectonic hydrothermalism that are relevant to mantle-derived magma and volcanic activities; the mineralized pedigree can be indicated as mantle derived-inner basin and deep source-crust source ore-forming materials.Variable factors of geology have been taken by mean of technique through section and optimization, thus creating a model of metallogenic prognosis. Quantitative delineation of geological anomalies and optimized target areas has been made out by means of informational method and the model of BP artificial innervation network. On the basis of above and background analysis of regional geology, eleven prospecting areas have been delineated and the prospecting possibilities in each potential area have been analyzed.