Neogene Uplift and Magmatism of Anatolia: Insights from 1 Drainage Analysis and Basaltic Geochemistry

McNab, F. and Ball, P. W. and Hoggard, M. J. and White, N. J. (2017) Neogene Uplift and Magmatism of Anatolia: Insights from 1 Drainage Analysis and Basaltic Geochemistry. Geochemistry, Geophysics, Geosystems, 19 (1). pp. 175-213. ISSN 15252027 DOI https://doi.org/10.1002/2017GC007251

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Abstract

It is generally agreed that mantle dynamics have played a significant role in generating and maintaining the elevated topography of Anatolia during Neogene times. However, there is much debate about the relative importance of subduction zone and asthenospheric processes. Key issues concern onset and cause of regional uplift, thickness of the lithospheric plate, and the presence or absence of temperature and / or compositional anomalies within the convecting mantle. Here, we tackle these interlinked issues by analyzing and modeling two disparate suites of observations. First, a drainage inventory of 1,844 longitudinal river profiles is assembled. This geomorphic database is inverted to calculate the 18 variation of Neogene regional uplift through time and space by minimizing the misfit between observed and calculated river profiles subject to independent calibration. Our results suggest that regional uplift commenced in the east and propagated westward. Secondly, we have assembled a database of geochemical analyses of basaltic rocks. Two di ff erent approaches have been used to quantitatively model this database with a view to determining the depth and degree of asthenospheric melting across Anatolia. Our results suggest that melting occurs at depths as shallow as 60 km in the presence of mantle potential temperatures as high as 1390◦ C. There is evidence that potential temperatures are higher in the east, consistent with the pattern of sub-plate shear wave velocity anomalies. Our combined results are consistent with isostatic and admittance analyses and suggest that elevated asthenospheric temperatures beneath thinned Anatolian lithosphere have played a first order role in generating and maintaining regional dynamic topography and basaltic magmatism.

Item Type: Article
Uncontrolled Keywords: 2017AREP; IA73;
Subjects: 02 - Geodynamics, Geophysics and Tectonics
Divisions: 02 - Geodynamics, Geophysics and Tectonics
08 - Green Open Access
12 - PhD
Journal or Publication Title: Geochemistry, Geophysics, Geosystems
Volume: 19
Page Range: pp. 175-213
Identification Number: https://doi.org/10.1002/2017GC007251
Depositing User: Sarah Humbert
Date Deposited: 05 Jan 2018 17:38
Last Modified: 03 Dec 2018 12:07
URI: http://eprints.esc.cam.ac.uk/id/eprint/4081

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