M. E. Varela

Diaphite structures of Campo del Cielo cliftonites indicate a terrestrial collision‐induced moderate shock process

Laura Noel García, Péter Némenth, Ronan Henry, R. Luther et autres

Abstract Cliftonites, polycrystalline aggregates of graphite with unusual cuboid morphology, are important carbon components of certain iron meteorites. Although they consist predominantly of sp2‐bonded carbon, recent studies suggest that those from the Canyon Diablo (IAB) meteorite also include composite sp2‐ and sp3‐bonded …

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Comments on “Shock‐heated graphite in three IAB iron meteorite–implications on the formation of diamond by Christ et al. (2025)”

Laura Noel García, M. E. Varela

The data that support the findings of this study are available from the corresponding author upon reasonable request.

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Bulk major and trace element abundances of barred olivine chondrules: Evidence about the physicochemical conditions in their region of nebular formation

M. E. Varela, J. Roszjar, Paul Sylvester, L. G. García

Abstract Barred olivine (BO) chondrules are present in ordinary and carbonaceous chondrites. We focus on the bulk major and trace element abundance composition of BO chondrules from carbonaceous, unequilibrated ordinary, and Rumuruti chondrites. Their bulk Fe/(FeO + MgO) wt% content versus the …

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Spheroidized plessite in Vaca Muerta: Formation mechanism and its implications for mesosiderites genesis and cooling history

Laura Noel García, F. Danoix, Martina Ávalos, Pouyan Shen et autres

Abstract The presence of spheroidized plessite (SP) in mesosiderites was recently reported in the literature. This finding coupled with the poor understanding of this plessite variant, motivated us to investigate its formation process and evaluate its implications in assessing the previous proposals …

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Classifying meteorites with MetNet : A deep learning approach using reflectance spectroscopy

Roshan Nath, K. Denesh, Neha Panwar, Abhishek J. Verma et autres

Abstract Meteorites, remnants of asteroids that successfully survive their passage through the Earth's atmosphere, hold critical information about the evolution and history of the solar system. Traditional methods of analyzing these rare and precious specimens often involve destructive geochemical techniques, which deplete …

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The Vaca Muerta mesosiderite: The path under which Fe‐Ni alloy ±C phases could have formed

M. E. Varela, Shyh‐Lung Hwang, P. Shen, L. N. Garcia et autres

Abstract The combined SEM and TEM studies on the metal (Fe‐Ni alloy ±C) portion of the Vaca Muerta mesosiderite reveal structural and compositional evidence at micro to nanoscale, which sheds light on the solidification of taenite + graphite as a cement, and …

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La fauna bentónica y su relación con la contaminación orgánica en el Río Negro, Prov. Chaco (Argentina) Estudio Preliminar

M. E. Varela, Danilo Héctor Di Persia, Argentino A. Bonetto

The Negro River (Chaco Province), an affluent of the Paraná River, receives the effluents coming from the several industries established along its margíns. As a result, its lower strech is variably affected by processes of organic polution, determining astrong change in the …

El Bentos del Parana Media en el tramo Corrientes-Esquina

Argentino A. Bonetto, M. E. Varela, José A. Bechara

Quali-quantitative variations of the benthos from the Middle Paraná river course, were studied. Spatial and temporal distribution was analyzed in relation with the main environmental factors. Studies were monthly carried out during March 1981-March 1982 in four stations near the localities of …

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Sulfide-metal-oxide phase assemblages in the D'Orbigny angrite: Implications for element diffusion paths involving Fe–Ni–S–O system and redox conditions

M. E. Varela, Shyh‐Lung Hwang, P. Shen, Laura Noel García et autres

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On the occurrences and formation mechanisms of cliftonites: The case of Campo del Cielo iron meteorite

Laura Noel García, Pouyan Shen, É. Quirico, M. E. Varela et autres

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Bulk and in-situ chemical analysis of meteorite Berduc, an L6 chondrite

A. Basu Sarbadhikari, Garima Arora, M. E. Varela, R. R. Mahajan

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Protective Effects of Halite to Vacuum and Vacuum-Ultraviolet Radiation: A Potential Scenario During a Young Sun Superflare

Ximena C. Abrevaya, Douglas Galante, Paula M. Tribelli, Oscar J. Oppezzo et autres

Halite (NaCl mineral) has exhibited the potential to preserve microorganisms for millions of years on Earth. This mineral was also identified on Mars and in meteorites. In this study, we investigated the potential of halite crystals to protect microbial life-forms on the …

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