Insights into chondrule formation process and shock-thermal history of the Dergaon chondrite (H4-5)

Ray, Dwijesh; Ghosh, Sekhar; Goswami, Tapos Kumar; Jobin, M.J.

doi:10.1016/j.gsf.2016.02.005

Cited by 6 publications

(10 citation statements)

References 23 publications

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“…Identical to the previous study, the Dergaon meteorite shows depleted K concentration and Na concentrations much larger than K concentrations. It is an inherently K-depleted H+chondrite [2] rather than the previously suggested impact-induced high-temperature alkali devolatilization process [3], since the laser-…”

Section: Discussionmentioning

confidence: 91%

“…The Dergaon meteorite is one such "fall", observed on March 2, 2001 [1] and comprises about ten different types of chondrules [2,3] with a variable chondrule: matrix ratio (60:40-80:20) [3]. The minerals that are present include:olivine (Ol:~Fo 80 -Fa 20 ), orthopyroxene (Opx:~En 82 -Fs 18 ), clinopyroxene (Cpx:~Wo 47 -En 46 -Fs 7 ), plagioclase (Plag: Ab 87 -An 13 ), chlorapatite, chromite, merrillite, kamacite-taenite, and troilite [3]. In addition to about 92%of the volume of mineral phases, glass constitutes about 8% of the total volume [3].…”

Section: Introductionmentioning

confidence: 99%

“…The minerals that are present include:olivine (Ol:~Fo 80 -Fa 20 ), orthopyroxene (Opx:~En 82 -Fs 18 ), clinopyroxene (Cpx:~Wo 47 -En 46 -Fs 7 ), plagioclase (Plag: Ab 87 -An 13 ), chlorapatite, chromite, merrillite, kamacite-taenite, and troilite [3]. In addition to about 92%of the volume of mineral phases, glass constitutes about 8% of the total volume [3]. It is a relatively well studied chondritic meteorite [3][4][5][6][7][8][9][10] possessing some interesting characteristics, such as potassium-depletion associated with vesiculated feldspars and the presence of aliphatic hydrocarbons [8,9] and nano-diamonds [10], observed using conventional analytical techniques including Gamma Ray, FTIR, and Laser Raman.…”

Section: Introductionmentioning

confidence: 99%

“…In addition to about 92%of the volume of mineral phases, glass constitutes about 8% of the total volume [3]. It is a relatively well studied chondritic meteorite [3][4][5][6][7][8][9][10] possessing some interesting characteristics, such as potassium-depletion associated with vesiculated feldspars and the presence of aliphatic hydrocarbons [8,9] and nano-diamonds [10], observed using conventional analytical techniques including Gamma Ray, FTIR, and Laser Raman. The meteorite was successfully analyzed by laser-induced breakdown spectroscopy (LIBS) [11][12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

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The Plasma Spectroscopic Study of Dergaon Meteorite, India

et al. 2020

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Meteorites are the recoverable portions of asteroids that reach the surface of the Earth. Meteorites are rare extraterrestrial objects studied extensively to improve our understanding of planetary evolution. In this work, we used calibration-free laser-induced breakdown spectroscopy (CF-LIBS) to evaluate the quantitative elemental and molecular analyses of the Dergaon meteorite, a H 4-5 chondrite fall sample from Assam, India. Spectral signatures of H, N, O, Na, Mg, Al, Si, P, K, Ca, Ti, Cr, Mn, Fe, Co, Ni, andIrweredetected. Along with the atomic emission, this work reports the molecular emission from FeO molecules. The concentration of the measured elements obtained using CF-LIBS is in close agreement with earlier reports. The elements H, N, and O and their concentrations are estimated by using CF-LIBS for the first time. This study applies laser spectroscopy to establish the presence of Ni, Cr, Co, and Ir in meteorites. The elemental analysis forms the basis for the establishment of the potential molecular composition of the Dergaon meteorite. Moreover, the elemental analysis approach bodes well for in-situ analyses of extraterrestrial objects including applications in planetary rover missions.

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Section: Discussionmentioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The Plasma Spectroscopic Study of Dergaon Meteorite, India

et al. 2020

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“…For example, Dergaon chondrite reports several significant observations that help to understand both nebular and asteroidal processes (e.g. [22]). Meteorites still hold many secrets about our earth and other solar system bodies that are yet to be deciphered.…”

Section: Resultsmentioning

confidence: 99%

Mineralogy of Meteorites from the North-Eastern India: A Brief Review

Saikia¹,

Parthasarathy²,

Borah³

2017

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We present a brief overview of meteorites from the north-eastern India, with a focus on falls, finds, and research developments. To date, out of a total 150 numbers of meteorites fall/find in India (in Meteoritical Bulletin Database), only six meteorites from north-eastern region have received official international recognition from the Nomenclature Committee of the Meteoritical Society. Among these six meteorites, 2 finds and 4 falls, including one ureilite, two H chondrites and three L chondrites. The first meteorite from north-eastern India (Assam L5, Find) was documented in 1846. After a lack of 153 years, the first fall (Sabrum LL6 chondrite) was documented in 1999. The most recent fall is Kamargaon (L6) chondrite in 2015. Intensively researched meteorites of this region are Goalpara and Dergaon. The reported most massive meteorite of north-eastern India is Mahadevpur (H4/5) chondrite, 70.5 kg of total known weight, and the rest are <13 kg of total known weight. The researches on these meteorites from north-east India can be applied to the newly recovered meteorites to understand the astrophysical enigma.

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Petrochemistry and Oxygen Isotope of Karimati (L5) Chondrite, a 2009 Fall in Uttar Pradesh, India

Ray

Panda

Arora

et al. 2022

Journal of the Geological Society of India

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Karimati, a single stone, weighing ~1 kg, fell on the mid-day of May 28, 2009, in Karimati village, Tahsil Hamirpur, Uttar Pradesh, India. Based on textures and mineralogy, Karimati is classified as brecciated, L5 (S2), ordinary chondrite. Petrologically, the chemical group, L has been assigned based on the typical mean compositions of olivine (Fa:25.5) and low-Ca pyroxene (Fs:21.6). The bulk chemical composition also resembles L chondrite as Mg/Si ratio ~0.82. Finally, the oxygen isotopic ratios of bulk meteorite sample yielded δ17O (+3.78%o and +4.07%o) and δ18O (+4.95%o and +5.52%o), respectively further confirmed Karimati as L-chondrite. The Karimati appears to have been subjected to single fragmentation in the atmospheric flight and it is evident from similar characters of all the lateral faces except the base of the pyramid in terms of its uniform colour, homogeneous fusion crust and shallow regmaglypts. The metamorphic equilibration temperature for Karimati chondrite using two different thermometers (olivine-chromite and two pyroxene thermometry) has been estimated and ranges 655°C and 770°C, respectively with a mean value of ~710°C and corresponds to the Type 5 thermal equilibration event.

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Insights into chondrule formation process and shock-thermal history of the Dergaon chondrite (H4-5)

Cited by 6 publications

References 23 publications

The Plasma Spectroscopic Study of Dergaon Meteorite, India

The Plasma Spectroscopic Study of Dergaon Meteorite, India

Mineralogy of Meteorites from the North-Eastern India: A Brief Review

Petrochemistry and Oxygen Isotope of Karimati (L5) Chondrite, a 2009 Fall in Uttar Pradesh, India

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