Yves Marrocchi

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Primitive interplanetary dust is expected to contain the earliest solar system components, including minerals and organic matter. We have recovered, from central Antarctic snow, ultracarbonaceous micrometeorites whose organic matter contains extreme deuterium (D) excesses (10 to 30 times terrestrial values), extending over hundreds of square micrometers. We(More)
59 Timing the appearance of photosynthetic microorganisms is crucial to understanding the 60 evolution of life on Earth. The ability of the biosphere to use sunlight as a source of energy 61 (photoautotrophy) would have been essential for increasing biomass and for increasing the 62 biogeochemical capacity of all prokaryotes across the range of redox(More)
To evaluate the isotopic composition of the solar nebula from which the planets formed, the relation between isotopes measured in the solar wind and on the Sun's surface needs to be known. The Genesis Discovery mission returned independent samples of three types of solar wind produced by different solar processes that provide a check on possible isotopic(More)
Pristine meteoritic materials carry light element isotopic fractionations that constrain physiochemical conditions during solar system formation. Here we report the discovery of a unique xenolith in the metal-rich chondrite Isheyevo. Its fine-grained, highly pristine mineralogy has similarity with interplanetary dust particles (IDPs), but the volume of the(More)
Gounelle, Y. Marrocchi, S. Mostefaoui, F. Robert, H. Leroux and A. Meibom. Laboratoire d’Étude de la Matière Extraterrestre, Muséum National d’Histoire Naturelle, 57, rue Cuvier, 75005, Paris, France; Laboratoire de Structure et Propriétés de l’Etat Solide, Université des Sciences et Technologies de Lille, 59655 Villeneuve d’Ascq, France; Dipartimento di(More)
In the nascent solar system, primitive organic matter was a major contributor of volatile elements to planetary bodies, and could have played a key role in the development of the biosphere. However, the origin of primitive organics is poorly understood. Most scenarios advocate cold synthesis in the interstellar medium or in the outer solar system. Here, we(More)
Noble gases trapped in meteorites are tightly bound in a carbonaceous carrier labeled “phase Q.” Mechanisms having led to their retention in this phase or in its precursors are poorly understood. To test physical adsorption as a way of retaining noble gases into precursors of meteoritic materials, we have performed adsorption experiments for Ar, Kr, and Xe(More)
Introduction: The Kaidun meteorite has been described as a complex polymict breccia. It contains clasts spanning a wide range of achondrite and chondrite groups [1]. The chondritic lithologies all contain carbonates, derived from aqueous alteration. In this work, we used a NanoSims to characterize 53 Mn-53 Cr internal isochrons on 3 individual dolomite(More)
Introduction: The Kaidun meteorite is a complex polymict breccia containing lithic clasts spanning a wide range of chondrite groups, including enstatite, ordinary and carbonaceous chondrites [1]. The latter is represented by the CR, CI and CM lithologies. These lithologies all contain carbonates, derived from aqueous alteration. Given that many other clasts(More)