@article{MTMT:2727407, title = {Alteration processes in the CV chondrite parent body based on analysis of NWA 2086 meteorite}, url = {https://m2.mtmt.hu/api/publication/2727407}, author = {Kereszturi, Ákos and Blumberger, Z. and Józsa, Sándor and May, Zoltán and Müller, A. and Szabó, Máté Zoltán and Tóth, Mária}, doi = {10.1111/maps.12336}, journal-iso = {METEORIT PLANET SCI}, journal = {METEORITICS & PLANETARY SCIENCE}, volume = {49}, unique-id = {2727407}, issn = {1086-9379}, year = {2014}, eissn = {1945-5100}, pages = {1350-1364}, orcid-numbers = {Józsa, Sándor/0000-0001-8219-0044} } @article{MTMT:2960519, title = {The Danebury Iron Age meteorite-An H5 ordinary chondrite "find" from Hampshire, England}, url = {https://m2.mtmt.hu/api/publication/2960519}, author = {Pillinger, CT and Pillinger, JM and Johnson, D and Greenwood, RC and Tindle, AG and Jull, Timothy AJ and Allen, DH and Cunliffe, B}, doi = {10.1111/maps.12301}, journal-iso = {METEORIT PLANET SCI}, journal = {METEORITICS & PLANETARY SCIENCE}, volume = {49}, unique-id = {2960519}, issn = {1086-9379}, year = {2014}, eissn = {1945-5100}, pages = {946-957} } @article{MTMT:2478826, title = {Cathodoluminescence microscopy and spectroscopy of forsterite from Kaba meteorite: An application to the study of hydrothermal alteration of parent body}, url = {https://m2.mtmt.hu/api/publication/2478826}, author = {Gucsik, Arnold and Endo, T and Nishido, H and Ninagawa, K and Kayama, M and Bérczi, Szaniszló and Nagy, S and Ábrahám, Péter and Kimura, Y and Miura, H and Gyollai, Ildikó and Simonia, I and Rózsa, Péter and Posta, József and Apai, D and Mihályi, K and Nagy, M and Ott, Ulrich}, doi = {10.1111/maps.12238}, journal-iso = {METEORIT PLANET SCI}, journal = {METEORITICS & PLANETARY SCIENCE}, volume = {48}, unique-id = {2478826}, issn = {1086-9379}, abstract = {Highly forsteritic olivine (Fo: 99.2-99.7) in the Kaba meteorite emits bright cathodoluminescence (CL). CL spectra of red luminescent forsterite grains have two broad emission bands at approximately 630 nm (impurity center of divalent Mn ions) in the red region and above 700 nm (trivalent Cr ions) in the red-IR region. The cores of the grains show CL blue luminescence giving a characteristic broad band emission at 400 nm, also associated with minor red emissions related to Mn and Cr ions. CL color variation of Kaba forsterite is attributed to structural defects. Electron probe microanalyzer (EPMA) analysis shows concentrations of Ca, Al, and Ti in the center of the forsterite grain. The migration of diffusible ions of Mn, Cr, and Fe to the rim of the Kaba meteoritic forsterite was controlled by the hydrothermal alteration at relatively low temperature (estimated at about 250 °C), while Ca and Al ions might still lie in the core. A very unusual phase of FeO (wüstite) was also observed, which may be a terrestrial alteration product of FeNi-metal. © The Meteoritical Society, 2013.}, year = {2013}, eissn = {1945-5100}, pages = {2577-2596}, orcid-numbers = {Gyollai, Ildikó/0000-0001-8576-0196} } @article{MTMT:1898391, title = {A Combined Petrographic and Micro-Raman Study of Meteoritic Microdiamond in ALH-77257 Ureilite and ALH-78113 Aubrite}, url = {https://m2.mtmt.hu/api/publication/1898391}, author = {Gyollai, Ildikó and Gucsik, Arnold and Veres, Miklós and Koós, Margit and Nagy, Sz and Bérczi, Szaniszló}, doi = {10.1080/00387010.2011.627527}, journal-iso = {SPECTROSC LETT}, journal = {SPECTROSCOPY LETTERS}, volume = {45}, unique-id = {1898391}, issn = {0038-7010}, abstract = {Two diamond-bearing meteorites (ALH-77257 and ALH-78113) were investigated by petrographic microscope and micro-Raman spectroscopy. The meteoritic diamonds can be found in fractures or veins cross-cutting the original minerals (olivine, pyroxene, feldspar) and inside the host minerals. The micro-Raman spectral features of microdiamonds in two studied meteorites are very similar to each other. The diamond peak was found at 1329 in ALH-77257 and 1332cm 1 in ALH-78113. Hexagonal diamond was not present. However, we observed the D and G bands of graphite or amorphous carbon at 1322 and 1582cm 1 wavenumbers, indicating an origin of the meteoritic microdiamonds by magmatic processes. © 2012 Copyright Taylor and Francis Group, LLC.}, keywords = {Diamond; melt pockets; micro-Raman spectroscopy; ureilite}, year = {2012}, eissn = {1532-2289}, pages = {151-155}, orcid-numbers = {Gyollai, Ildikó/0000-0001-8576-0196} } @article{MTMT:2149903, title = {Shock and thermal annealing history of the ALH 77005 Martian meteorite: A micro-Raman spectroscopical investigation}, url = {https://m2.mtmt.hu/api/publication/2149903}, author = {Nagy, S and Józsa, Sándor and Gucsik, Arnold and Bérczi, Szaniszló and Ninagawa, K and Nishido, H and Veres, Miklós and Kereszturi, Ákos and Hargitai, Henrik}, doi = {10.1556/CEuGeol.55.2012.1.3}, journal-iso = {CENT EUR GEOL}, journal = {CENTRAL EUROPEAN GEOLOGY}, volume = {55}, unique-id = {2149903}, issn = {1788-2281}, abstract = {We studied optical microscopic and micro-Raman spectroscopic signatures of shocked olivine from the ALH 77005 Martian meteorite sample. The purpose of this study is to document pressure and temperature-related effects in olivine over the entire sample, which can aid in understanding structural changes due to shock metamorphism and the post-shock thermal annealing processes of lherzolitic Martian meteorites. According to the optical microscope observations, three areas may be discernible in olivine of the ALH 77005 in the vicinity of the melt pocket. The first area is the thermally undisturbed part of a grain, which contains a high density of shock-induced planar microdeformations such as Planar Deformation Features (PDFs) and Planar Fractures (PFs). Compared to the first area, the second area shows less shock-induced microstructures, while the third area is a strongly recrystallized region, but not formed from a melt.A common Raman spectral feature of these olivines is a regular doublet peak centered at 823 and 852 cm-1; additionally, two new peaks at 535 and 755 cm -1 appear in the weakly annealed transition zones.}, keywords = {microstructure; annealing; recrystallization; raman spectroscopy; temperature effect; olivine; high pressure; deformation mechanism; observational method; P-T conditions; micro-Raman spectroscopy; SHOCK METAMORPHISM; MARTIAN METEORITE; high pressure zeta phase}, year = {2012}, eissn = {1789-3348}, pages = {33-48}, orcid-numbers = {Józsa, Sándor/0000-0001-8219-0044; Hargitai, Henrik/0000-0001-6563-6921} } @article{MTMT:2286301, title = {Micro-Raman study of the Allende meteoritic nanodiamonds: supernova-driven shock wave origin is revisited.}, url = {https://m2.mtmt.hu/api/publication/2286301}, author = {Gucsik, Arnold}, doi = {10.1556/CEuGeol.54.2011.3.4}, journal-iso = {CENT EUR GEOL}, journal = {CENTRAL EUROPEAN GEOLOGY}, volume = {54}, unique-id = {2286301}, issn = {1788-2281}, abstract = {I have studied the Raman spectroscopic signatures of nanodiamonds from the Allende meteorite,in which some portions must be of presolar origin as indicated by the isotopic compositions of various trace elements. The spectra of the meteoritic nanodiamonds show a narrow peak at 1326 cm–1 and a broad band at 1590 cm–1. Compared to the intensities of these peaks, the background fluorescence is relatively high. A significant frequency shift from 1332 to 1326 cm–1, peak broadening, andappearance of a new peak at 1590 cm–1 might be due to shock effects during formation of the diamond grains. Such changes may have several origins: an increase in bond length, a change in the electron density function or charge transfer, or a combination of these factors. However, Raman spectroscopy alone does not allow distinguishing between a shock origin of the nanodiamonds and formation by a CVD process, as is favored by most workers.}, keywords = {FLUORESCENCE; trace element; raman spectroscopy; Isotopic composition; electron density; shock wave; ALLENDE METEORITE; shock waves; Nanodiamond; PRESOLAR GRAINS}, year = {2011}, eissn = {1789-3348}, pages = {261-270} } @article{MTMT:1317386, title = {Micro-Raman spectroscopy of anomalous planar microsctructures in quartz from Mt. Oikeyama. Discovery of a probable impact crater in Japan}, url = {https://m2.mtmt.hu/api/publication/1317386}, author = {Sakamoto, M and Gucsik, Arnold and Nishido, H and Ninagawa, K and Okumura, T and Toyoda, S}, doi = {10.1111/j.1945-5100.2009.01003.x}, journal-iso = {METEORIT PLANET SCI}, journal = {METEORITICS & PLANETARY SCIENCE}, volume = {45}, unique-id = {1317386}, issn = {1086-9379}, year = {2010}, eissn = {1945-5100}, pages = {32-42} } @article{MTMT:1283179, title = {Cathodoluminescence, electron microscopy, and Raman spectroscopy of experimentally shock-metamorphosed zircon}, url = {https://m2.mtmt.hu/api/publication/1283179}, author = {Gucsik, Arnold and Koeberl, C and Brandstätter, F and Reimold, WU and Libowitzky, E}, doi = {10.1016/S0012-821X(02)00754-9}, journal-iso = {EARTH PLANET SC LETT}, journal = {EARTH AND PLANETARY SCIENCE LETTERS}, volume = {202}, unique-id = {1283179}, issn = {0012-821X}, abstract = {Thorough understanding of the shock metamorphic signatures of zircon could be the basis for the use of this mineral as a powerful tool for the study of old, deeply eroded, and metamorphically overprinted impact structures and formations. This study of the cathodoluminescence (CL) and Raman spectroscopic signatures of experimentally (20–60 GPa) shock-metamorphosed zircon single crystals contributes to the understanding of high-pressure microdeformation in zircon. For all samples, an inverse relationship between the brightness of the backscattered electron (BSE) signal and the corresponding cathodoluminescence intensity was observed. The unshocked sample shows crosscutting, irregular fractures. The 20 GPa sample displays some kind of mosaic texture of CL brighter and darker domains, but does not exhibit any shock metamorphic features in BSE or CL images. The 40 GPa sample shows a high density of lamellar features, which might be explained by the phase transformation between zircon- and scheelite-structure phases of zircon and resulting differences in the energy levels of the activator elements. The CL spectra of unshocked and shocked (20, 40, and 60 GPa) zircon samples are dominated by narrow emission lines and broad bands in the region of visible light and in the near-UV range. The emission lines result from rare earth element activators and the broad bands might be associated with lattice defects. Raman spectra revealed that the unshocked and 20 GPa samples represent zircon-structure material, whereas the 40 GPa sample yielded additional peaks with relatively high peak intensities, which are indicative of the presence of the scheelite-type high-pressure phase. The 60 GPa sample has a Raman signature that is similar to that of an amorphous phase, in contrast to the observations of an earlier TEM study that the crystalline scheelite-structure phase is stable at this shock pressure. The 60 GPa Raman signature cannot be explained at this stage. The results show a clear dependence of the CL and Raman properties of zircon on shock pressure, which confirm the possible usage of these methods as shock indicators.}, year = {2002}, eissn = {1385-013X}, pages = {495-510} } @article{MTMT:1783722, title = {New studies on meteorites from Hungary: Corrections in the London Meteorite Catalogue. Meteoritics & Planetary Science}, url = {https://m2.mtmt.hu/api/publication/1783722}, author = {Bérczi, Szaniszló and Kubovics, Imre and Don, Gy and Ditrói-Puskás, Zuárd and Gál-Sólymos, K and Földi, T and Solt, P and Záray, Gy}, journal-iso = {METEORIT PLANET SCI}, journal = {METEORITICS & PLANETARY SCIENCE}, volume = {36}, unique-id = {1783722}, issn = {1086-9379}, year = {2001}, eissn = {1945-5100}, pages = {107} } @article{MTMT:1767176, title = {New results from the Kaba meteorite part I. chondrules}, url = {https://m2.mtmt.hu/api/publication/1767176}, author = {Kubovics, Imre and Gálné Sólymos, Kamilla and Ditrói-Puskás, Zuárd and Bérczi, Szaniszló}, journal-iso = {ACTA GEOL HUNG}, journal = {ACTA GEOLOGICA HUNGARICA: A QUARTERLY OF THE HUNGARIAN ACADEMY OF SCIENCES}, volume = {43}, unique-id = {1767176}, issn = {0236-5278}, abstract = {The re-examined Kaba meteorite (Hungary) is being investigated by modern research methods. The present report focuses on the EPMA studies of this carbonaceous chondrite, mainly on the chondrules. The textural features, mineralogical and chemical composition of six characteristic types of chondrules, as well as phenocrysts and matrix, indicate an extremely wide temperature range of formation (1973° K-403° K). The multi-stage, selective condensation may have commenced at about 1973° K with the appearance of A12O3, then perovskite and spinel were formed with decreasing temperature. At the end of the process magnetite, maghemite and organic compounds were the condensation products. All of these comprise the almost complete scale of condensation steps. Beside condensation and aggregation, melting and crystallization processes play a role in the chondrule formation.}, keywords = {mineralogy; Inclusion; meteorite; chondrule; White inclusion; MUlti-stage condensation; EPMA studies; Chondrule types; Carbonaceous chondrite; chondrite}, year = {2000}, pages = {477-492} }