Csátalja, the largest H4–5 chondrite from Hungary

Kovács, János; Sajó, István E.; Márton, Zsuzsanna; Jáger, Viktor; Hegedüs, T.; Berecz, Tibor; Toth, T.; Gyenizse, Péter; Podobni, András

doi:10.1016/j.pss.2014.11.009

Cited by 5 publications

(10 citation statements)

References 39 publications

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“…The higher shock-in duced IR shift of the Csátalja-2 sam ple than in Csátalja-1 is caused by a higher amount of shock melting. Com par ing our Raman FWHM val ues to those of Kovács et al (2015b) on this me te or ite, the peak shock pres sure somewhat ex ceeded 15 GPa in the case of olivines, so higher than Kovacs et al es ti mated.…”

Section: Evaluation Of Estimated Shock Stagesmentioning

confidence: 47%

“…As a sum mary, FWHM val ues of py rox enes oc ca sion ally in di cate dif fer ent shock stages (S3-S4) than do the op ti cal ob ser va tions. Csátalja-2 py rox enes and olivines are more strongly shocked than in the ref er ence value of Kovács et al (2015b) as the first mea sure ment from the same me te or ite. The min er als in mixed clasts show sim i lar shock stages to each other in the Csátalja-2 sam ple (S4-S5).…”

Section: Evaluation Of Estimated Shock Stagesmentioning

confidence: 92%

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

Keresztúri

Fintor

Gyollai

et al. 2018

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1 Re search Cen tre for As tron omy and Earth Sci ences, Konkoly Thege Miklos As tro nom i cal In sti tute, H-1121 Bu da pest, Konkoly Thege Miklós út 15-17, Hun gary 2 Uni ver sity of Szeged, Vulcano Pe trol ogy and Geo chem is try Re search Group, De part ment of Min er al ogy, Geo chem is try and Pe trol ogy, Hun gary 3 Re search Cen tre for As tron omy and Earth Sci ences, In sti tute for Geo log i cal and Geo chem i cal Re search, Hun gary 4 In ter na tional Me te or ite Col lec tors As so ci a tion (IMCA#6251) 5 Re search Cen tre for As tron omy and Earth Sci ences, Geo graph ical In sti tute, Hun gary 6 Eötvös Loránd Uni ver sity, De part ment of En vi ron men tal and Land scape Ge og ra phy, Hun gary Kereszturi, A., Fintor, K., Gyollai, L., Kereszty, Z., Szabo, M., Szalai, Z., Wal ter, H., 2018. Shock het er o ge ne ity and shock his tory of the re cently found or di nary Csátalja chondrite in Hun gary. Geo log i cal Quar terly, 62 (2): 433-446, doi: 10.7306/gq.1416Shock im pact-pro duced min eral al ter ations in two thin sec tions of the re cently found Csátalja H4 or di nary chondrite me te orite are com pared. Peak po si tions of Raman and in fra red spec tra of min eral clasts show peaks shifted in wavenumber rel a tive to unshocked ref er ence min er als, and both peak shifts and FWHM val ues seem to cor re late to each other. In the less shocked thin sec tion (Csátalja-1) a more monomineralic and ho mo ge neous com po si tion in di cate shock pres sures of <15 GPa, while the more shocked Csátalja-2 in di cates shock pres sure in the 15-17 GPa range. The high est iden ti fied in frared peak po si tion shifts range be tween -48 and +28 cm -1 with peak broad en ing be tween 60-84 cm -1 in the case of the feldspars, which, to gether with sul phide glob ules, were pro duced by the shock it self. Feld spar spec tra could be de tected only by FTIR spec tros copy, but in most cases (above the S3 shock level) the mixed type of the pyroxene-feld spar spec tra (both peaks in the same spec tra) is in agree ment with the shock-pro duced sec ond ary feld spars. These grains are lo cated around crys tal line bor ders, and prob a bly formed by se lec tive melt ing, due to shock an neal ing. In re con struc tion of the shock his tory, an early frag men ta tion by a lower shock ef fect and a later in creased shock level-re lated vein and melt pocket for ma tion occurred, with sub se quent shock an neal ing; tem po ral re con struc tion of the shock event is pos si ble only in part. The joint us age of Raman and in fra red spec tros copy pro vided use ful in sights into the shock-pro duced changes and their spa tial inhomogeneity, while shocked feld spar could be better de tected by in fra red than by the Raman method.Key words: me te or ite, shock im pact al ter ation, or di nary chondrite, in fra red and Raman spec tros copy.

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Section: Evaluation Of Estimated Shock Stagesmentioning

confidence: 47%

Section: Evaluation Of Estimated Shock Stagesmentioning

confidence: 92%

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

Keresztúri

Fintor

Gyollai

et al. 2018

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“…In this work, a “recently” found (in August 2012) H chondrite called Csatalja (H4, S2, W1) is analyzed, focusing mainly on the shock‐driven alteration. The meteorite shows several shock‐produced features and recrystallized units (Kovács et al., 2015). It is known that shock impact pulverization in the parent body of these meteorites has produced brecciated structures; however, using detailed textural and compositional analysis, we aim to understand which steps of the evolution of such a body could be decoded.…”

Section: Introductionmentioning

confidence: 99%

“…on its surface(Kov acs et al, 2015).• Central shearing zone: The most heavily fractured zone with brecciated texture and rectangular clasts characterized by cataclastic texture in numerous shock veins; the of microfracture infiltrations. It is bordered by a clastic shock vein from the average inner volume of the sample.…”

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confidence: 99%

Formation and shock impact history of the Csatalja ordinary chondrite

Gyollai

Keresztúri

Chatzitheodoridis

et al. 2022

Meteorit & Planetary Scien

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The analysis of the Csatalja H4 chondrite (which was found in August 2012) suggests shock‐related textures and spatial inhomogeneities, indicating a complex geological history. In the most heavily fractured and sheared units, small opaque grains and older fractures have locally enhanced the shock effect, producing melt. While the impact textures were evident in most units of the meteorite, mechanical shearing is apparent in only two units, suggesting that these units might have been present at somewhat different locations inside the parent body. Shearing also occurred at the border of the so‐called xenolith unit, confirming its mechanical mixing with the other units. Besides fragmentation and melting, chemical changes due to impact have also been identified, producing compositional homogenization of olivines in 30% of the investigated area of the sample's thin section (23 mm2), and moderate accumulation of Fe, Ca, and Na in the strongly shocked zones, initiating crystallization of feldspar in veins with a specific spatial distribution (feldspar glass with metal–sulfide globules). Analyzing the high P–T minerals, the peak shock pressure and temperature values differed substantially in the various units, ranging between 2 and 17 GPa, 100 and >1200 °C. The xenolith unit crystallized more slowly after the impact event and does not show shock impact alterations, suggesting that it was formed in a deeper region of the parent body. This was later shifted to its current surroundings and was lithified (fixed) to the rest of the sample. This “randomly selected” Csatalja sample provides information on the range of the formation temperatures, pressures, and processes that contributed to the heterogeneity of meteorites at the mm spatial scale, in general. The identified heterogeneity is a result not purely of the shock effects but also of the different pre‐shock structural characteristics. The shock also mixed fragments mechanically that have been formed at different environments, with at least several dozens or even 100 m depth in the parent body.

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“…The elements included in the sample are vaporized, atomized and excited in hot plasma generating an atomic and ionic spectrum that is characteristic of the elemental composition of the sample [1]. LIBS has been widely employed in the chemical analysis of meteorites of diverse nature using different laboratory based set-ups [2][3][4][5]. Stand-off LIBS at distances up to 8.…”

Section: Introductionmentioning

confidence: 99%

Analytical methodology to elemental quantification of weathered terrestrial analogues to meteorites using a portable Laser-Induced Breakdown Spectroscopy (LIBS) instrument and Partial Least Squares (PLS) as multivariate calibration technique

Gómez‐Nubla

Aramendia

Vallejuelo

et al. 2018

Microchemical Journal

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The present work is focused on the in situ quantitative analysis of Si, Al, Mg, Ca, Ba, Na, and Fe, present in weathered terrestrial analogues to meteorites (black steel slag and impact glasses), using a portable Laser Induced Breakdown Spectroscopy (LIBS) instrument. For that purpose, several standards pellets of known elemental concentrations were manufactured. The elemental and molecular homogeneity of the pellets was studied by means of Scanning Electron Microscopy coupled to Energy Dispersive X-ray spectroscopy (SEM-EDS) and Raman spectroscopy. This check was always made before the LIBS analysis. Univariate and multivariate (Partial Least Squares (PLS) regression) calibration approaches on LIBS spectra were selected as initial calibration models. After a comparison between both approaches, the former was discarded due to the poor linearity of the calibration curves, and PLS regression was chosen to treat the LIBS spectra as the multivariate calibration approach (in the ultraviolet (UV) and infrared (IR) spectral ranges). Predictive capabilities of each calibration model were evaluated by calculating regression coefficient (r), number of PLS factors (rank), relative errors of cross validation (RMSECV), residual predictive deviation (RPD) and the Bias value. At the end, the simultaneous use of both ranges of wavelengths was demonstrated to be more fruitful rather than using the individual ones, probably due to the higher number of emission lines, number of spectral variables and the PLS latent variables for each element. Moreover, a Reference Material was used as external validation, obtaining satisfactory results in the determination of elements. The predictive ability of the PLS models was evaluated on samples of Darwin Glasses (Australia), Libyan Desert Glasses (Western Desert of Egypt) and black steel slag residues (steelworks of Basque Country). The obtained results were in concordance with the range of composition measured also by X-ray Fluorescence Spectrometer (ED-XRF). Our 2 methodology is a good, rapid, simple and cost-effective alternative for in situ analysis of these terrestrial analogues over other techniques.

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Csátalja, the largest H4–5 chondrite from Hungary

Cited by 5 publications

References 39 publications

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

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

Formation and shock impact history of the Csatalja ordinary chondrite

Analytical methodology to elemental quantification of weathered terrestrial analogues to meteorites using a portable Laser-Induced Breakdown Spectroscopy (LIBS) instrument and Partial Least Squares (PLS) as multivariate calibration technique

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