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Combined Multifactor Evidence of a Giant Lower-Mantle Ring Structure Below the Eastern Mediterraneanстатья
- Авторы: Eppelbaum L.V., Ben-Avraham Z., Katz Y., Cloetingh S., Kaban M.
- Журнал: Positioning
- Номер: 11
- Год издания: 2020
- Первая страница: 11
- Последняя страница: 32
- DOI: 10.4236/pos.2020.112002
- Аннотация: In the Arabian-Northern African region, the interaction of the Nubian, Arabian, and Eurasian plates and many small tectonic units is conspicuous. To better understand this interaction, we use satellite-derived gravity data (re-tracked to the Earth’s surface) recognized now as a powerful tool for tectonic-geodynamic zonation. We applied the polynomial approximation to the gravity data which indicated the presence of a large, deep ring structure in the eastern Mediterranean centered below the Island of Cyprus. Quantitative analysis of residual gravity anomaly provides an estimate of the deep anomalous body’s upper edge at a depth of about 1700 km. Computations of the residual gravity anomalies for the lower mantle also indicate the presence of anomalous sources. The GPS vector pattern coinciding with the gravity trend implies a counterclockwise rotation of this structure. Independent analyses of the geoid isolines map and seismic tomography data support the existence of a deep anomaly. Paleomagnetic data analysis from the surrounding regions confirms a counterclockwise rotation. Numerous petrological, mineralogical, geodynamical, and tectonic data suggest a relation between this deep structure and near-surface processes. This anomaly sheds light on many phenomena including the Cyprus gravity anomaly, counterclockwise rotation of the Mesozoic terrane belt, and asymmetry of basins along continental transform faults
- Добавил в систему: Лев Виленович Эппельбаум