Tectonic and crustal structure of Archangelsky ridge using Bouguer gravity data


ELMAS A. , KARSLI H.

MARINE GEOPHYSICAL RESEARCH, vol.42, no.3, 2021 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 42 Issue: 3
  • Publication Date: 2021
  • Doi Number: 10.1007/s11001-021-09443-z
  • Title of Journal : MARINE GEOPHYSICAL RESEARCH
  • Keywords: Total horizontal derivative, Archangelsky ridge, Inverse solution, Structural discontinuity, Normalized full gradient, BLACK-SEA BASIN, GEODYNAMIC EVOLUTION, POTENTIAL FIELDS, GRADIENT-METHOD, ANOMALIES, INVERSION, HISTORY, WESTERN, BODIES, REGION

Abstract

To investigate the crustal structure of the Archangelsky Ridge, gravity data obtained from the World Gravity Map (WGM2012) were analyzed using Total Horizontal Derivative (THD), Parker-Oldenburg (PO) inversion and Normalized Full Gradient (NFG) techniques. The THD method was applied to the Bouguer gravity after band-pass filtering in order to image the discontinuities. The maximum amplitude values of the THD were used to reveal the discontinuities caused by the density difference in the Archangelsky Ridge and its vicinity. In addition, the basement upper surface topography of the region was calculated and mapped with the inverse solution. Moreover, the presence of an uplift area in the northeast of the study area, as well as the elevation of the Archangelsky Ridge was determined. The depth to the Cretaceous aged sedimentary basement in the Sinop basin and on the Archangelsky Ridge approximately reaches 4 km and 1.6 km, respectively. The average upper surface depth of the basement is calculated as 5 km under the Eastern Black Sea Basin (EBSB). Finally, depth calculations were made using NFG method for the selected profiles and correlated with gravity inversion results. The depth results of the basement upper surface topography obtained from NFG and inversion methods are compatible with each other within +/- 0.1 km error limits.