Studies of the deep structure in transition zones from oceans to continents |
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| Authors: | A G Gainanov D A Gilod A A Antipov A A Bulychev K V Krivosheya |
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| Institution: | (1) Department of Geology, Moscow State University, Moscow, Russia |
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| Abstract: | Studies of the deep structure of the earth’s crust, lithosphere, and asthenosphere (tectonosphere) of transition zones from continents to oceans is one of the urgent issues of present-day geology and geophysics. The most important information on the deep structure of such zones is provided by seismic and seismological methods. Meanwhile, a comparison between gravity data and results of seismic studies showed that the gravity anomalies observed in the marginal seas of the Pacific Ocean cannot be explained solely by changes in the thickness and composition of the earth’s crust. In order to estimate the internal structure of the Pacific type of transition zones, the authors performed an analysis of the anomalous gravity field and the field of geoid heights in the Indonesian region, which also included calculations of the values of the gravity field and geoid heights in different reductions (Bouguer, Glenny, and isostatic), their transformations, and compilation of density models of the tectonosphere of the transition zone of this region compatible with the geological and geophysical data available. As a result of these studies, we performed zonation of the Indonesian region with respect to the gravity field and defined particular features of the areas distinguished. Based on the analysis performed, we inferred the existence of differences in the structure of individual zones both in the upper layers of the tectonosphere and in deeper layers. Detailed characteristics of the anomalous gravity fields typical of the objects distinguished are presented. |
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