Fall, mineralogy and chemistry of Nathdwara H6 chondrite

Agarwal, V. K.; Parthasarathy, G.; Sisodia, M. S.; Bhandari, N.

doi:10.1016/j.gsf.2013.07.004

Cited by 5 publications

(5 citation statements)

References 9 publications

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“…Compositional analysis of ambient Mössbauer measurements accords well with earlier values (Agrawal et al, 2014(Agrawal et al, , 2016. Based on the olivine and pyroxene compositional ratio the sample was classified as ordinary chondrite belonging to H6 group (Agarwal et al, 2014).…”

Section: Discussionsupporting

confidence: 89%

“…(b) two sextets corresponding to troilite and kamacite (iron nickel alloy) and one doublet for silicate minerals (olivine plus pyroxene) with estimation of what 17%, 3% and ~80% respectively . Within experimental errors, compositional values of all the constituent minerals accorded well with the earlier reports (Agrawal et al 2014(Agrawal et al , 2016.…”

Section: Mineralogical Measurementssupporting

confidence: 90%

“…A piece of well characterized meteoritic specimen of Nathdwara was acquired from Dr G. Parthasarathy for high pressure studies. Mineralogical and compositional studies on the representative piece using x-ray fluorescence (XRF) and Electron Probe Microanalyzer (EPMA) techniques indicated olivine (42-45 vol %), pyroxene (23-25 vol %), troilite (6-8 vol %) and other minerals (kamacite, ilmenite etc) in small quantity (Agrawal et al, 2014). On the other hand, room temperature Mössbauer measurements on the sample detected olivine 55.1%, pyroxene 25.2%, troilite 16.7% without any traces of Kamacite (Agrawal et al, 2016).…”

Section: Mineralogical Measurementsmentioning

confidence: 99%

“…A thin section of grey rocky interior, underneath the crust, showed a chondritic structure. Agrawal et al (2014) provide the details about the location of the stone fall and mineralogical details.…”

Section: Introductionmentioning

confidence: 99%

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Geometry and Topology of the Boolean Model on a Stationary Point Processes : A Brief Survey

Chandra

Srihari

Pandey

et al. 2018

Proceedings of the Indian National Science Academy

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We report here high-pressure investigations, using 57 Fe Mössbauer spectroscopic and synchrotron X-ray diffraction techniques with diamond anvil cell on a meteorite fall at Nathdwara (India) categorized as an ordinary H6 chondrite. Mössbauer spectroscopic measurements were performed with compression up to 10GPa under hydrostatic conditions while XRD measurements were carried out up to 16 GPa in both hydrostatic and non-hydrostatic environments. Mössbauer studies demonstrated phase transitions for troilite and pyroxene at low pressures of 4.5 GPa and 6 GPa respectively. Main aim of the study was to investigate behavior of olivine (major constituent of the meteorite sample) which showed an unusual transformation of high spin Fe 2+ configuration at room pressure to low spin Fe 2+ phase at ~ 6 GPa. High pressure XRD measurements supported the above findings. Further XRD studies indicated reversible incomplete transformation of olivine to wadsleyite at 14.46 GPa under hydrostatic condition and complete transformation into ringwoodite at 16.7 GPa under non-hydrostatic compression. Not much has been reported about various phase transformations of meteoritic olivine at room temperature.

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Section: Discussionsupporting

confidence: 89%

Section: Mineralogical Measurementssupporting

confidence: 90%

Section: Mineralogical Measurementsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Geometry and Topology of the Boolean Model on a Stationary Point Processes : A Brief Survey

Chandra

Srihari

Pandey

et al. 2018

Proceedings of the Indian National Science Academy

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“…9 There were many studies on mineralogical and geochemical characterization of meteorites which fell in India, but there were no reports on spectroscopic studies on meteorites that fell in India were carried out. [10][11][12][13] Raman spectroscopy has already been used for meteorite characterization and identification of shock-induced features, [7][8][9] this paper reports the vibrational characteristics of olivine and pyroxene on the ordinary chondrite and to investigate the presence of any high pressure phase in Kamargaon.…”

Section: Introductionmentioning

confidence: 99%

Untitled

2018

OAJMTP

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The Raman spectroscopic technique has been utilized to determine the silicate composition and structure of Kamargaon meteorite (an ordinary chondrite L6 type; Kamargaon: 26°39ˊ01 ̋ N and 93° 46ˊ 02 ̋ E, India). The micro-Raman spectra in the range of 100-2000cm−1 revealed principal characteristic bands of the major minerals: olivine, pyroxene and plagioclase. Fourier transformed infrared technique is used as complementary to the Laser Raman spectroscopic method. The presence of some mineral phases such as kamacite and taenite as well as troilite and chromite were determined by X-ray diffraction method. The present study demonstrates the usefulness of Laser-Raman spectroscopic method in identifying high pressure mineral phases which are present in the shocked meteorite.

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