We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
MANTLE GRAVITATIONAL ANOMALIES IN ZONES OF DIFFERENT ENDOGENOUS EARTH REGIMES.
- Authors
Gordienko, Vadim; Gordienko, Lyudmila
- Abstract
The incomplete deep process of recent activation (RA), widespread on all continents and oceans, does not fully reconstructed from the geological events available for study. It can be a direct removal of matter from the bottom of the upper mantle under the crust or create an intermediate chamber at a depth of about 200 km. To select a more realistic option, the construction of density models of the Earth's crust and upper mantle along the system of profiles crossing Eurasia and North America, the Atlantic and Pacific oceans, and transition zones between continents and oceans was considered. The crust models are constructed according to velocity sections along DSS profiles. The density sections are recalculated as anomalous in terms of the density of the upper platform mantle. The gravitational effect of these models is calculated as –870 mGl in regions where a zero field is observed. This value was experimentally found for the East European platform, for which the geological and geophysical knowledge is at a maximum. The author’s ideas about deepseated processes are used for the upper mantle. They are associated with heat and mass transfer under different endogenous regimes. These processes produce temperature distributions that are different from the platform distribution, which corresponds to an anomalous (different from the platform) density distribution. The gravitational effects calculated for these anomalous models are summed with crustal effects. Regions with endogenous regimes of all types have been studied: platforms, zones of recent activation, geosynclines and rifts of different ages, the mid-ocean ridge, ocean depressions, marginal trough, island arc, and back-arc depressions. The sum is matched with the fields observed in all cases. In all the studied regions, the differences we found do not exceed those explained by the observation and calculation errors (15 ± 4 mGl). Thus, tectonospheric density modeling is one of the methods for testing the used schemes of deep processes, in particular, the RA process.
- Subjects
EURASIA; NORTH America; GRAVITATIONAL effects; MID-ocean ridges; MASS transfer; TEMPERATURE distribution; EARTH (Planet); ISLAND arcs
- Publication
New Concepts in Global Tectonics Journal, 2023, Vol 11, Issue 1, p63
- ISSN
2202-5685
- Publication type
Article