Mantle flow uplift of western Anatolia and the Aegean: Interpretations from geophysical analyses and geodynamic modeling

Citations Over TimeTop 14% of 2012 papers

Abstract

The Western Anatolian and Aegean region demonstrates a complex geologic history of horizontal and vertical tectonics. Active normal faulting and exhumation zones indicate that Western Anatolia has experienced significant extension since the Oligocene‐Early Miocene (∼30 Ma). Our geophysical analyses demonstrate that the region is also uplifted relative to an elevation that would be expected given an isostatic response to the lithosphere structure. Namely, topography “residuals” indicate a residual uplift of about 1500 m over ∼200 km sections of Western Anatolia and the Aegean. Admittance functions between free‐air gravity and topography indicate that the regional topography is isostatically uncompensated and as it approaches ∼50 mGal/km at the longest wavelengths, the uncompensated topography is likely owing to an underlying mantle flow component. Using forward geodynamic modelling we consider an idealized section of Western Anatolian lithosphere based on tomographic inversions and examine the magnitude and pattern of surface topography to reconcile with the geophysical observables. The models consistently show a plateau‐type uplift (and horizontal extension) through Western Anatolia with an amplitude and wavelength consistent with the residual topography calculations. Together, the geophysical analyses and modelling provide independent quantitative evidence that the thin Anatolian‐Aegean lithosphere is being buoyed upwards by underlying mantle flow. The mantle flow may be associated with active lithosphere delamination beneath the region; a process that would also explain the ongoing crustal extension.

Related Papers

• → Topography and geoid due to lithospheric mass anomalies(1995)71 cited
• → Residual Gravity Anomalies of the Hawaiian Seamounts and Anomalies of the Thickness of Lithosphere(1982)2 cited
• Study of the relationship between the tectonic stress and the deformation of the lithosphere in the territory of Poland - a new geodynamics research project(2007)
• → Lateral variations in lithosphere strength in the Carpathians - Constraints on basin evolution and neogene geodynamics(1996)
• → Anomalies in Thickness of the Lithosphere in the Northwest Pacific(1981)