A5015755802- Astro and Planetary Science
- Planetary Science and Exploration
- Isotope Analysis in Ecology
- Stellar, planetary, and galactic studies
- Astrophysics and Star Formation Studies
- High-pressure geophysics and materials
- Geology and Paleoclimatology Research
- Geological and Geochemical Analysis
- Astronomical and nuclear sciences
- Marine and environmental studies
- Spacecraft and Cryogenic Technologies
- Collagen: Extraction and Characterization
- Nuclear Materials and Properties
- Molten salt chemistry and electrochemical processes
- Scientific Research and Discoveries
- Space Science and Extraterrestrial Life
- Bone and Dental Protein Studies
- Advanced Chemical Physics Studies
- Space Exploration and Technology
- Origins and Evolution of Life
- Methane Hydrates and Related Phenomena
- Pleistocene-Era Hominins and Archaeology
- Chemical Thermodynamics and Molecular Structure
- Nuclear reactor physics and engineering
- Proteoglycans and glycosaminoglycans research
University of Copenhagen
2014-2025
Natural History Museum Aarhus
2014-2024
Université Paris Cité
2019-2022
Centre National de la Recherche Scientifique
2019-2022
Institut de physique du globe de Paris
2019-2022
Natural History Museum of Denmark
2014
Significance Comets are pristine, volatile-rich objects formed beyond the orbits of gas giants and, thus, thought to preserve a record primordial molecular cloud material parental our Solar System. We use magnesium and chromium isotopes show that class pristine chondrites, metal-rich carbonaceous has signature distinct from most inner System planets asteroids. This is consistent with predicted for unprocessed material, suggesting that—similar comets—metal-rich chondrites samples asteroids...
We report on the petrology, magnesium isotopes and mass-independent 54Cr/52Cr compositions (μ54Cr) of 42 chondrules from CV (Vigarano NWA 3118) CR (NWA 6043, 801 LAP 02342) chondrites. All sampled are classified as type IA or IAB, have low 27Al/24Mg ratios (0.04–0.27) display little no evidence for secondary alteration processes. The show variable 25Mg/24Mg 26Mg/24Mg values corresponding to a range mass-dependent fractionation ∼500 ppm (parts per million) atomic mass unit. This Mg isotope is...
We report novel analytical procedures allowing for the concurrent determination of stable and mass-independent Cr isotopic composition silicate materials by multiple collector inductively coupled mass spectrometry (MC-ICPMS).
Abstract We report on the mass-independent Cr isotope compositions of 11 main group ureilites and an ureilitic trachyandesite (ALM-A). The 54 Cr/ 52 ratios for vary from −1.06 ± 0.04 to −0.78 0.05 averaged at −0.91 0.15 (2SD, N = 18) including data literature. argue that this variation reflects primitive mantle heterogeneities within ureilite parent body (UPB). As such, did not experience a global-scale magma ocean, which is consistent with heterogeneous O in ureilites. Furthermore, ε...
Abstract CM meteorites are dominant members of carbonaceous chondrites ( CC s), which evidently accreted in a region separated from the terrestrial planets. These key determining accretion regions solar system materials, since Mg and Cr isotope space, they intersect between what identified as inner outer reservoirs. In this model, reservoir is represented by metal‐rich MRCC including CR chondrites. An important question remains whether barrier s was temporal or spatial one. chondrules used...
Polymict ureilites are meteoritic breccias that provide insights into the differentiation history of ureilite parent body. We have sampled a total 24 clasts from polymict Dar al Gani 319, representing variety lithologies such as mantle residues, cumulates and crustal fragments genetically related to monomict ureilites. In addition, we four non-indigenous dark two chondrule-containing same meteorite. report on petrology bulk mass-dependent mass-independent magnesium chromium isotope...
The so far unique role of our Solar System in the universe regarding its capacity for life raises fundamental questions about formation history relative to exoplanetary systems. Central this research is accretion asteroids and planets from a gas-rich circumstellar disk final distribution their mass around Sun. key building blocks may be represented by chondrules, main constituents chondritic meteorites, which turn are primitive fragments planetary bodies. Chondrule mechanisms, as well...
Abstract Understanding the origin of chondritic components and their accretion pathways is critical to unraveling magnitude mass transport in protoplanetary disk, as well accretionary history terrestrial planet region and, by extension, its prebiotic inventory. Here we trace heritage pristine from relatively unaltered CV chondrite Leoville through mass-independent Cr mass-dependent Zn isotope compositions. Investigating these fractions such detail reveals an onion-shell structure chondrules,...
Knowledge of the nucleosynthetic isotope composition outermost protoplanetary disk is critical to understand formation and early dynamical evolution Solar System. We report discovery outer material preserved in a pristine meteorite based on its chemical composition, organic-rich petrology, 15 N-rich, deuterium-rich, 16 O-poor signatures. infer that this originated comet-forming region. The Fe, Mg, Si, Cr compositions reveal that, contrary current belief, signature region ubiquitous among...
The recent fall of the relatively unaltered CM chondrite Maribo provides a unique opportunity to study early stages aqueous alteration on parent body. We show using transmission electron microscopy matrix FIB-section from that this meteorite mainly appears consist tochilinite-cronstedtite intergrowths (TCIs), but also contains regions amorphous or nanocrystalline silicates, anhydrous silicates and FeNi metal aggregates with thin iron oxide rims, suggesting it experienced small degree. A...
During protoplanetary disk formation, dust grains located in the outer retain their pristine icy composition, while solids inner stellar-heated undergo volatile loss. This process may have left a fossil record Solar System material showing different nucelosynthetic imprints that been attributed to degrees of thermal processing. However, it remains unclear how large mass fraction thermally-processed inner-disk pebbles is produced and these are subsequently transported throughout disk. In this...
Primitive meteorites are samples of asteroidal bodies that contain a high proportion chemically complex organic matter (COM) including prebiotic molecules such as amino acids, which thought to have been delivered Earth via impacts during the early history Solar System. Thus, understanding origin COM, their formation pathway(s) and environment(s), is critical elucidate life on well assessing potential habitability exoplanetary systems. The Isheyevo CH/CBb carbonaceous chondrite contains...
Abstract Events following the giant impact formation of Moon are thought to have led volatile depletion and concurrent mass-dependent fractionation isotopes moderately elements (MVE). The detailed processes conditions surrounding this episode remain obscured not unified by a single model for all compounds. Using available data, including new Zn isotope data eight lunar samples, we demonstrate that isotopic MVE in is best expressed nonideal Rayleigh distillation, approaching factor α using...
FeNi metals represent an important fraction of chondritic components that remains relatively unexplored within most carbonaceous chondrite groups. The compositions these can place constraints on the nature their precursor materials as well physicochemical conditions chondrule formation. In this study, we have analyzed major, minor and trace element metal grains from unaltered chondrites NWA 801 (CR), Leoville (CV3.1), Paris (CM2.9), Maribo (CM2.8) Bells (CM-an). We observe a predominant...
Rocky planets may acquire a primordial atmosphere by the outgassing of volatiles from their magma ocean. The distribution O between H