First International Conference on MOLDAVIAN RISKS – FROM ...

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<strong>First</strong> <strong>International</strong> <strong>Conference</strong> on MOLDAVIAN RISKS - FROM GLOBAL TO LOCAL SCALE 16-19 May 2012, Bacau, Romania THE SURFACE TECTONICS OF LITHOSPHERIC REMOVAL BENEATH THE SOUTH EAST CARPATHIANS Oguz Gogus, Gregory Houseman University of Leeds, Institute of Geophysics and Tectonics Corresponding author: Oguz Gogus, O.Gogus@leeds.ac.uk Abstract: The lithosphere beneath the South Carpathians-Transylvania-Focsani region has been the focus of a number of modeling studies and various geological and geophysical observations are provided to understand its evolution. Namely, lithospheric thinning, extensional deformation, widespread volcanism and seismic activity are primary observations associated with tectonic deformation in this region. Using numerical geodynamic experiments, we test the hypothesis that the tectonic anomalies for the south east Carpathians are due to the delamination of the mantle lithosphere. We explore a range of rheological parameters and boundary conditions to determine controls on the style of lithospheric delamination. Our models predict that tectonic subsidence of 3 km can occur above the delaminating hinge and surface elevations as great as 2 km may develop in the narrow zone of delamination. The surface topography of delaminating lithosphere is distinctly asymmetric with a localized and migrating zone of subsidence at the delaminating hinge as well as surface uplift due to the isostatic/dynamic response to the lithospheric removal. Detachment of the delaminating lithosphere modifies the topography near the delamination hinge. Delamination progresses more rapidly when mantle lithosphere has higher yield stresses compared to less rigid mantle lithosphere. Our results are tested against the present day topography and seismic velocities determined by tomography beneath the Focsani basin and South East Carpathian mountains. Key words: South East Carpathians, anomalous topography, migrating subsidence, young volcanism, delamination. 38
<strong>First</strong> <strong>International</strong> <strong>Conference</strong> on MOLDAVIAN RISKS - FROM GLOBAL TO LOCAL SCALE 16-19 May 2012, Bacau, Romania ANALYSIS OF HAZARD POLLUTION ON OLD PESTICIDE STORAGES IN MOLDOVA Oleg Bogdevich, Oleg Cadocinicov, Culighin Elena Academy of Science of Moldova, Institute of Geology and Seismology Corresponding author: Oleg Bogdevich, bogdevicholeg@yahoo.com Abstract: The inventory of old pesticide storages in Moldova executed by Ministry of Environment and World Bank showed a large quantity of polluted sites (near 1500) remains after the repacking and evacuation project. More that 15 % sites were determined as extra high polluted territory with the POPs concentration in soil more 50,0 mg/kg. They include some of the world’s most harmful chemicals including highly toxic pesticides such as HCH, DDT and industrial chemicals such as PCBs. The aim of this work is to determine all pollution spectrums on 50 polluted sites for Environmental Risk Assessment procedure and the remediation action development. GC and GC/MS equipment and international analytical methods (EPA, ISO, etc.) were used in accredited laboratory by ISO17025 for the determination of toxic substances in soil and other environmental samples. Five POPs compound groups namely ∑ DDT, ∑ HCH, Chlordane, Heptachlor and Toxaphene have been found on studied sites. They have an additional pollution by trifluraline, triazines, perithroids, PAHs and other old pesticides. Small number of sites has high heavy metal pollution. All sites were distributed on five pollution clusters for the risk assessment procedure and the ranking of investigated sites: 0.10 – 1.0 mg/kg; 1.0 – 10.0 mg/kg; 10.0 – 50.0 mg/kg; 50.0 – 250.0 mg/kg; and more 250.0 mg/kg. The toxicity level, MAC and possible synergism effect were used for the risk assessment procedure of polluted sites. The conclusion is that pollution spectrum is complex on investigated sites and it can be extrapolated for all polluted sites in Moldova. The possible remediation action should to be developed after the complex study of pollution spectrum and geotechnical conditions for every site. Created database of polluted territories is used actually by local and central authorities for the waste management and planning of remediation action in Republic of Moldova. Key words: Toxic Substances, GC, GC/MS, Environmental Impact Assessment. 39
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Sponsors of the conference Sodexo P
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