InSAR surface deformation and numeric modeling unravel an active salt diapir in southern Romania

Author:

Manea Vlad Constantin,Armaş Iuliana,Manea Marina,Gheorghe Mihaela

Abstract

AbstractSalt diapirism is often associated with potential hydrocarbon energy resources, and detecting active diapirs can strongly affect the prospect to discover new gas and oilfields. Here we use InSAR techniques as a proxy to evaluate surface deformation in the Diapiric Fold Zone located in the East Carpathians Bend. Significant surface uplift (~ 5 mm/year) is identified in a relatively small region not previously known for the presence of an actively rising salt diapir. Using high-resolution two-dimensional thermomechanical numerical simulations of salt diapirs intrusions, we show that that the observed surface deformation can be induced by a relatively small salt diapir (1–2 km in diameter) rising from an initial salt layer located at < 7 km depth. We constrain the salt diapir viscosity by comparing the InSAR surface deformation pattern with results from numerical simulations and our best fitting model is obtained for a salt viscosity of 1 × 1017 Pa s. The best fitting model reveals the presence of a relatively small salt diapir that has not pierced yet the entire sedimentary layer and is located just 1–2 km below the surface.

Funder

Research Institute of the University of Bucharest–ICUB, University of Bucharest

Unitatea Executiva pentru Finantarea Invatamantului Superior, a Cercetarii, Dezvoltarii si Inovarii

Romanian Ministry of National Education and Scientific Research, RDI Program for Space Technology and Advanced Research - STAR

Publisher

Springer Science and Business Media LLC

Subject

Multidisciplinary

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