The Relationship of the Petrophysical Characteristics to Material and Age-Related Features of Granitoids in Peter the Great Bay (Sea of Japan)

Here are presented the results of the petrophysical studies of granitoid complexes located on the Muravyov-Amursky Peninsula and the Russky and Popov islands. The factual basis of the research was a collection of field samples from the Late Permian and Middle and Late Jurassic granitoid complexes. The determination and analysis have been made on their density and magnetic susceptibility according to the generally accepted methodology. It has been found that the heterogeneous rocks differ sharply in their physical properties mentioned above. The Late Permian granitoids of the Sedanka complex have higher densities and magnetic susceptibilities than the Middle and Late Jurassic granitoids of the insular complex. A relationship has been determined between physical characteristics of the granotoids and their mineral composition and formation conditions. A conclusion has been made that the physical properties may be used as an additional criterion for the material and age-related differentiation of magmatic complexes located on other island and underwater structures of Peter the Great Bay and in its continental coastal zone. Results of the study may be used for interpretation of the geophysical fields in Peter the Great Bay.