Results 31 to 40 of about 52,439 (271)

A brief history of the Department of Cosmoecology and Cosmic Mineralogy (to 50-anniversary of M. P. Semenenko Institute of Geochemistry, Mineralogy and Ore Formation NAS of Ukraine)

Геофизический журнал, 2019
The history of origin and evolution in Ukraine of mineralogical studies of cosmic samples, mainly meteorites, and the main stages of formation of the Department of Сosmoecology and Cosmic Mineralogy at the M. P.
V. P. Semenenko
doaj   +1 more source

An extraterrestrial trigger for the mid-Ordovician ice age: Dust from the breakup of the L-chondrite parent body

Science Advances, 2019
The disruption of a 150-km large asteroid filled the inner solar system with dust that cooled Earth and caused faunal turnovers. The breakup of the L-chondrite parent body in the asteroid belt 466 million years (Ma) ago still delivers almost a third of ...
B. Schmitz, K. Farley, S. Goderis, P. Heck, S. M. Bergström, S. Boschi, P. Claeys, V. Debaille, A. Dronov, M. van Ginneken, D. Harper, F. Iqbal, J. Friberg, S. Liao, E. Martin, M. Meier, B. Peucker‐Ehrenbrink, B. Soens, R. Wieler, F. Terfelt   +19 more
semanticscholar   +1 more source

Chromium Isotopic Evidence for an Early Formation of Chondrules from the Ornans CO Chondrite

Astrophysical Journal, 2019
Chondrules are the main components of primitive meteorites and possibly the building blocks of planetary embryos and terrestrial planets. However, their ages and modes of formation are still highly debated. Here, we present high-precision Cr isotope data
K. Zhu 朱, Jia Liu, F. Moynier, L. Qin, C. Alexander, Yongsheng He   +5 more
semanticscholar   +1 more source

Microbial mediation of textures and minerals – terrestrial or parent body processes?

Open Astronomy, 2019
Evolution of chondritic parent body is influenced by thermal, impact metamorphism and aqueous alteration, studied in Mező-Madaras, Knyahinya, Mócs and Nyírábrány in aspect of high resolution in situ textural, mineralogical and organic geochemical ...
Polgári Márta, Gyollai Ildikó, Bérczi Szaniszló, Veres Miklós, Gucsik Arnold, Elemér Pál-Molnár   +5 more
doaj   +1 more source

Chromites in ordinary-chondrite fusion crusts [PDF]

European Journal of Mineralogy
Chromites from ordinary chondrites of groups H4, H5, LL5, LL6, L3.6 and L6 were studied and compared to an H5 ordinary chondrite processed to form a synthetic fusion crust.
M. Bellesi, G. Pratesi, A. Di Michele, S. Nazzareni, L. Pittarello, L. Pittarello, S. Goderis, C. Santini, G. Giuli   +8 more
doaj   +1 more source

Simulated asteroid materials based on carbonaceous chondrite mineralogies

Meteoritics and Planetary Science, 2019
A set of high‐fidelity simulated asteroid materials, or simulants, was developed based on the mineralogy of carbonaceous chondrite meteorites. Three varieties of simulant were developed based on CI1 chondrites (typified by Orgueil), CM2 chondrites ...
D. Britt, K. Cannon, K. D. Donaldson Hanna, J. Hogancamp, O. Poch, P. Beck, Dayl Martin, J. Escrig, L. Bonal, P. Metzger   +9 more
semanticscholar   +1 more source

Paleomagnetic Evidence for a Partially Differentiated Ordinary Chondrite Parent Asteroid

Journal of Geophysical Research: Planets, 2019
The textures and accretion ages of chondrites have been used to argue that their parent asteroids never differentiated. Without a core, undifferentiated planetesimals could not have generated magnetic fields through dynamo activity, so chondrites are not
J. Bryson, B. Weiss, B. Getzin, J. N. Abrahams, F. Nimmo, A. Scholl   +5 more
semanticscholar   +1 more source

Testing accretion mechanisms of the H chondrite parent body utilizing nucleosynthetic anomalies

Meteoritics and Planetary Science, 2019
Planetary bodies a few hundred kilometers in radii are the precursors to larger planets but it is unclear whether these bodies themselves formed very rapidly or accreted slowly over several millions of years.
S. Pedersen, M. Schiller, J. Connelly, M. Bizzarro   +3 more
semanticscholar   +1 more source

Northwest Africa 5958: A weakly altered CM‐related ungrouped chondrite, not a CI3 [PDF]

, 2016
Northwest Africa (NWA) 5958 is a carbonaceous chondrite found in Morocco in 2009. Preliminary chemical and isotopic data leading to its initial classification as C3.0 ungrouped have prompted us to conduct a multitechnique study of this meteorite and ...
E. Jacquet, J. Barrat, P. Beck, F. Caste, J. Gattacceca, C. Sonzogni, M. Gounelle   +6 more
semanticscholar   +1 more source

YARATKULOVO – A NEW H-CHONDRITE IN THE URALS: MINERALOGICAL DATA [PDF]

Минералогия, 2017
The Yaratkulovo meteorite was found in 2016 in the Argayash district of the Chelyabinsk region. It is a «chondrite breccia», in which the light coarse-grained fragments (primary chondrite) occur in the dark fine-grained matrix (impact assemblages ...
V.V. Sharygin, S.V. Kolisnichenko
doaj