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Shock heterogeneity and shock history of the recently found ordinary Csátalja chondrite in Hungary

Kereszturi A., Fintor K, Gyollai I., Kereszty Z., Szabo M., Szalai Z., Walter H.

Geological Quarterly

2018

Vol. 62, No. 2

433--446

Shock impact-produced mineral alterations in two thin sections of the recently found Csátalja H4 ordinary chondrite meteorite are compared. Peak positions of Raman and infrared spectra of mineral clasts show peaks shifted in wavenumber relative to unshocked reference minerals, and both peak shifts and FWHM values seem to correlate to each other. In the less shocked thin section (Csátalja-1) a more monomineralic and homogeneous composition indicate shock pressures of <15 GPa, while the more shocked Csátalja-2 indicates shock pressure in the 15–17 GPa range. The highest identified infrared peak position shifts range between –48 and +28 cm–1 with peak broadening between 60–84 cm–1 in the case of the feldspars, which, together with sulphide globules, were produced by the shock itself. Feldspar spectra could be detected only by FTIR spectroscopy, but in most cases (above the S3 shock level) the mixed type of the pyroxene-feldspar spectra (both peaks in the same spectra) is in agreement with the shock-produced secondary feldspars. These grains are located around crystalline borders, and probably formed by selective melting, due to shock annealing. In reconstruction of the shock history, an early fragmentation by a lower shock effect and a later increased shock level-related vein and melt pocket formation occurred, with subsequent shock annealing; temporal reconstruction of the shock event is possible only in part. The joint usage of Raman and infrared spectroscopy provided useful insights into the shock-produced changes and their spatial inhomogeneity, while shocked feldspar could be better detected by infrared than by the Raman method.

Local geoid determination by GDS and levelling for oil field of Algyo

Dede K., Szabo M., Szucs L.

Reports on Geodesy

1999

z. 5/46

97-102

Is the Adria a Promontory or Exists as an Independent Microplate ?

Altiner Y., Colic K., Marjanovic M., Medic Z., Medved M., Miskovic D., Pitribicevic B., Rasic L., Seeger H., Szabo M.

Reports on Geodesy

1999

z. 5/46

149-157

In 1994, for the investigation of the present-day tectonics in the area of the Adriatic Sea a GPS network of 22 stations distributed over Croatia (17), Slovenia (3), and Italy (2) was established. In 1996, the network was extended towards the south and the west by 7 new stations. Three GPS campaigns in 1994, 1996, and 1998 were conducted within this network. Processing ofthe data from 1994 and 1996 was completed by the Bundesamt fur Kartographie und Geodasie in Frankfurt/Main using the Bernese GPS Software (Version 4.0). Based on an analytical surface deformation theory applied to the velocities derived within the CRODYN'94 and CRODYN'96 campaigns, the Adriatic Sea area indicates three different defermotion zones.