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Impact cratering on volatile-rich targets: Some remarks related to the Deep Impact experiment Vrije Universiteit Brussel
The NASA Deep Impact experiment has important implications to better understand cratering processes on planetary bodies and the production and evolution of ejecta. This manmade impact of a solid Cu body on the nucleus of a comet fills the large gap existing between data derived from small-scale cratering experiments and large-scale field or remote sensing observations of craters. DI thus complements hydrocode modeling of cratering processes. The ...
Shock-deformed zircon from the Chicxulub impact crater and implications for cratering process Vrije Universiteit Brussel
Large impact structures with peak rings are common landforms across the solar system, and their formation has implications for both the interior structure and thermal evolution of planetary bodies. Numerical modeling and structural studies have been used to simulate and ground truth peak-ring formative mechanisms, but the shock metamorphic record of minerals within these structures remains to be ascertained. We investigated impact-related ...
DISENTANGLING CRATERING PROCESSES USING NON-TRADITIONAL ISOTOPE RATIOS ON CORE M0077A OF THE IODP-ICDP EXPEDITION 364 IN THE CHICXULUB IMPACT STRUCTURE Vrije Universiteit Brussel
Introduction: The Chicxulub impact structure, located on the Yucatán peninsula of Mexico, has been drilled by the IODP-ICDP Expedition 364 in 2016. A continuous sequence of the upper peak-ring has been retrieved from Site M0077A. This core is from top to bottom composed of ~110 m of Paleogene sediments, ~130 m of suevite and impact melt rocks, and ~590 m of crystalline and metamorphic basement lithologies [1]. The suevite complex deposition is ...
Ocean resurge-induced impact melt dynamics on the peak-ring of the Chicxulub impact structure, Mexico Vrije Universiteit Brussel
Core from Hole M0077 from IODP/ICDP Expedition 364 provides unprecedented evidence for the physical processes in effect during the interaction of impact melt with rock-debris-laden seawater, following a large meteorite impact into waters of the Yucatán shelf. Evidence for this interaction is based on petrographic, microstructural and chemical examination of the 46.37-m-thick impact melt rock sequence, which overlies shocked granitoid target ...
The formation of peak rings in large impact craters Vrije Universiteit Brussel KU Leuven
The Chicxulub impact crater, known for its link to the demise of the dinosaurs, also provides an opportunity to study rocks from a large impact structure. Large impact craters have “peak rings” that define a complex crater morphology. Morgan et al. looked at rocks from a drilling expedition through the peak rings of the Chicxulub impact crater (see the Perspective by Barton). The drill cores have features consistent with a model that postulates ...
El'gygytgyn impact crater's fireball layer: spherules, impact melts, meteoritic component. Vrije Universiteit Brussel
Introduction: The 18 km Ø El'gygytgyn impact crater in
NE Siberia formed 3.6 Ma ago in a target of 83.2 to 89.3 Ma old,
~620 m thick, rhyolitic, andesitic, and dacitic volcanics [1,2]. An
International Continental Drilling Program (ICDP) project recovered
drill cores from an inner-crater continuous section of impactite
deposits that contain scarce, pristine impact melt particles
and glass spherules [3,4]. ...
NE Siberia formed 3.6 Ma ago in a target of 83.2 to 89.3 Ma old,
~620 m thick, rhyolitic, andesitic, and dacitic volcanics [1,2]. An
International Continental Drilling Program (ICDP) project recovered
drill cores from an inner-crater continuous section of impactite
deposits that contain scarce, pristine impact melt particles
and glass spherules [3,4]. ...
Petrography of impact glasses and melt breccias from the El’gygytgyn impact structure, Russia Vrije Universiteit Brussel
Impact spherules from Karelia, Russia: Possible ejecta from the 2.02 Ga Vredefort impact event Vrije Universiteit Brussel
Spherule beds of possible impact origin have been discovered in two drill cores in the Paleoproterozoic Zaonega Formation, Karelia, northwest Russia. Spherules are found within the dolomite matrix of in situ brecciated sedimentary dolostones. Spherules are millimeter size and generally round, although teardrop and dumbbell morphologies are present. Spherules contain up to 0.75 ppb Ir, with a Ru/Ir of 2, indicating a mixing of target rocks with a ...
Projectile identification in terrestrial impact structures and ejecta material Vrije Universiteit Brussel
Next to the rare finds of meteorite fragments in or near impact structures, a handful of geochemical methods can be applied to confirm the impact origin of a structure, or a layer and, to constrain the nature of the impacted projectile. During crater formation on a solid planetary surface, a small amount of projectile material, generally (