A5078477383- Astro and Planetary Science
- Planetary Science and Exploration
- Geology and Paleoclimatology Research
- Isotope Analysis in Ecology
- Geological and Geochemical Analysis
- Paleontology and Stratigraphy of Fossils
- Polar Research and Ecology
- Geomagnetism and Paleomagnetism Studies
- Geochemistry and Elemental Analysis
- Space Exploration and Technology
- Stellar, planetary, and galactic studies
- High-pressure geophysics and materials
- Cryospheric studies and observations
- Geochemistry and Geologic Mapping
- Scientific Research and Discoveries
- Coal and Its By-products
- Cold Fusion and Nuclear Reactions
- Microbial Community Ecology and Physiology
- Nuclear Physics and Applications
- Spacecraft and Cryogenic Technologies
- Field-Flow Fractionation Techniques
- thermodynamics and calorimetric analyses
- Mineralogy and Gemology Studies
- Pleistocene-Era Hominins and Archaeology
- Marine and environmental studies
Vrije Universiteit Brussel
2016-2024
University of Kent
2020-2024
Institute of Natural Sciences
2018-2024
Université Libre de Bruxelles
2016-2021
Imperial College London
2015-2019
Natural History Museum
2016-2018
University of Siena
2008-2012
Korea Polar Research Institute
2012
Structure et Instabilité des Génomes
2008
Aix-Marseille Université
2008
Direct links between carbonaceous chondrites and their parent bodies in the solar system are rare. The Winchcombe meteorite is most accurately recorded chondrite fall. Its pre-atmospheric orbit cosmic-ray exposure age confirm that it arrived on Earth shortly after ejection from a primitive asteroid. Recovered only hours falling, composition of largely unmodified by terrestrial environment. It contains abundant hydrated silicates formed during fluid-rock reactions, carbon- nitrogen-bearing...
Airbursts are estimated to be the most frequent and hazardous type of impact events. Yet, confirmation these events elusive, resulting in a major gap record Earth. The recent discovery igneous chondritic spherules produced during new touchdown airburst 430 thousand years (kyr) ago over Antarctica, which projectile vapor jet interacts with Antarctic ice sheet, provided first trace such an geological record. In terms petrology geochemistry, particles constituting BIT-58 dust horizon, was found...
We report the discovery of large accumulations micrometeorites on Myr-old, glacially eroded granitic summits several isolated nunataks in Victoria Land Transantarctic Mountains. The number (>3,500) (>400 mum and up to 2 mm size) melted unmelted particles is orders magnitudes greater than other Antarctic collections. Flux estimates, bedrock exposure ages presence approximately 0.8-Myr-old microtektites suggest that extraterrestrial dust collection occurred over last 1 Myr, taking 500 kyr...
The disruption of a 150-km large asteroid filled the inner solar system with dust that cooled Earth and caused faunal turnovers.
Research Article| February 01, 2011 Kamil Crater (Egypt): Ground truth for small-scale meteorite impacts on Earth L. Folco; Folco 1Museo Nazionale dell'Antartide Università di Siena, Via Laterina 8, 53100 Italy Search other works by this author on: GSW Google Scholar M. Di Martino; Martino 2Istituto Astrofisica, Osservatorio Astronomico Torino, 10025 Pino Torinese, A. El Barkooky; Barkooky 3Department of Geology, Faculty Sciences, Cairo University, Giza, Egypt D'Orazio; D'Orazio...
Micrometeorites are cosmic dust particles recovered from the Earth's surface that dominate influx of extraterrestrial material accreting to our planet. This paper provides first in-depth study weathering micrometeorites within Antarctic environment will allow primary and secondary features be distinguished. It is based on analysis 366 Larkman Nunatak 25 Transantarctic Mountain collection. Several important morphological categories effects were identified: (1) irregular faceted cavities, (2)...
I-type cosmic spherules are micrometeorites that formed by melting during atmospheric entry and consist mainly of iron oxides FeNi metal. I-types important because they can readily be recovered from sedimentary rocks allowing study solar system events over geological time. We report the results a mineralogy petrology 88 Antarctica in order to evaluate how evolved entry, constrain nature their precursors establish rigorous criteria which may conclusively identified within sediments rocks. Two...
High-precision oxygen isotopic compositions of eighteen large cosmic spherules (>500 µm diameter) from the Atacama Desert, Chile, were determined using IR-laser fluorination – Isotope Ratio Mass spectrometry. The four discrete groups defined in a previous study on Transantarctic Mountains (Suavet et al., 2010) identified, confirming their global distribution. Approximately 50% studied are related to carbonaceous chondrites, 38% ordinary chondrites and 12% unknown parent bodies. 90% barred...
We report on the detection in southern Egypt of an impact crater 45 meters diameter with a pristine rayed structure. Such structures are typically observed atmosphereless rocky or icy planetary bodies solar system. This feature and association iron meteorite impactor shock metamorphism provides unique picture small-scale hypervelocity impacts Earth's crust. Contrary to current geophysical models, ground data indicate that meteorites masses order tens tons can penetrate atmosphere without...
Abstract– On the basis of morphological and petrographic characteristics, eight “giant” unmelted micrometeorites in 300–1100 μm size range were selected from Transantarctic Mountain micrometeorite collection, Victoria Land, Antarctica. Mineralogical geochemical data obtained by means scanning electron microscopy, probe microanalyses, synchrotron X‐ray diffraction allow their classification as chondritic micrometeorites. The large increases considerably amount mineralogical information...
Abstract The Winchcombe meteorite is a CM chondrite breccia composed of eight distinct lithological units plus cataclastic matrix. degree aqueous alteration varies between intensely altered CM2.0 and moderately CM2.6. Although no lithology dominates, three heavily rock types (CM2.1–2.3) represent >70 area%. Tochilinite–cronstedtite intergrowths (TCIs) are common in several lithologies. Their compositions can vary significantly, even within single lithology, which prevent clear assessment...
Abstract Fusion crusts form during the atmospheric entry heating of meteorites and preserve a record conditions that occurred deceleration in atmosphere. The fusion crust Winchcombe meteorite closely resembles other stony meteorites, particular CM2 chondrites, since it is dominated by olivine phenocrysts set glassy mesostasis with magnetite, highly vesicular. Dehydration cracks are unusually abundant Winchcombe. Failure this weak layer an additional ablation mechanism to produce large...
Abstract We report the discovery of significant numbers (500) large micrometeorites (>100 μm) from rooftops in urban areas. The identification particles as is achieved on basis their compositions, mineralogies, and textures. All are silicate-dominated (S type) cosmic spherules with subspherical shapes that form by melting during atmospheric entry consist quench crystals magnesian olivine, relict forsterite, iron-bearing olivine within glass. Four also contain Ni-rich metal-sulfide...
Abstract We report the discovery of a large accumulation micrometeorites (MMs) in supraglacial moraine at Larkman Nunatak Grosvenor Mountains Transantarctic Range Antarctica. The MMs are present abundances ~600 particles kg −1 sediment and include near‐complete collection MM types similar to those observed Antarctic blue ice within bare‐rock traps Antarctic. size distribution is consistent with collected from snow collections suggesting has captured representative cosmic spherules...
Micrometeorites originate from the interplanetary dust complex and continuously fall to Earth's surface in large amounts. About 10 20% of micrometeorites are not melted upon reaching surface, preserving primary features characteristics parent material. Consequently, unmelted micrometeorites, together with scoriaceous an intermediate form between cosmic spherules pivotal documenting nature evolution as well modifications experienced by during atmospheric entry. Based on their petrographic...
Abstract– We report bulk and olivine compositions in 66 stony cosmic spherules (Na 2 O < 0.76 wt%), 200–800 μm size, from the Transantarctic Mountains, Antarctica. In porphyritic spherules, relict olivines that survived atmospheric entry heating are always Ni‐poor similar composition to carbonaceous or unequilibrated ordinary chondrites (18 spherules), equilibrated (one spherule). This is consistent with selective survival of high temperature, Mg‐rich during entry. Olivines crystallized...
Abstract The Mighei‐like carbonaceous (CM) chondrites have been altered to various extents by water–rock reactions on their parent asteroid(s). This aqueous processing has destroyed much of the primary mineralogy these meteorites, and degree alteration is highly heterogeneous at both macroscale nanoscale. Many CM meteorites are also heavily brecciated juxtaposing clasts with different histories. Here we present results from fine‐grained team consortium study Winchcombe meteorite, a recent...
The ~790 ka Australasian (micro)tektite strewn field is one of the most recent and best-known examples impact ejecta emplacement as result a large-scale cratering event across considerable part Earth's surface (>10% in area). characterized by tri-lobe pattern consisting large central distribution lobe, two smaller side lobes extending to west east. Here, we report on discovery microtektite-like particles sedimentary traps, containing abundant micrometeorite material, Sør Rondane Mountain...