Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 23 for “"carbonaceous chondrites"”.
-
The Elastic Properties of Carbonaceous Chondrites
… and Tagish Lake meteorites (ungrouped C2 carbonaceous chondrite) indicate variation in fragmentation behavior. The steeper size distribution of the carbonaceous lithology apparently reflects its lower strength. A comparison between the smooth and rough terranes on Itokawa shows that …
-
Synchrotron Based Infrared Microspectroscopy of Carbonaceous Chondrites.
… and inorganic minerals are investigated in five carbonaceous chondrites, Northwest Africa 852 (CR2), Tagish Lake (C2-ungroupped), Orgueil (CI1), Sutter's Mill (CM), and Murchison (CM2), with micron spatial resolution using synchrotron-based imaging micro-FTIR spectroscopy. Correlations based on …
-
Analysis of pathways for volatile-bearing mineral formation in carbonaceous chondrites using thermodynamic simulations
Low temperature minerals in carbonaceous chondrites record volatile processes in the solar system. These processes could occur via liquid-solid or gas-solid reactions; however, few studies have considered gases. A Gibbs free energy minimization approach was used to investigate the formation of the …
-
Analysis of pathways for volatile-bearing mineral formation in carbonaceous chondrites using thermodynamic simulations
Low temperature minerals in carbonaceous chondrites record volatile processes in the solar system. These processes could occur via liquid-solid or gas-solid reactions; however, few studies have considered gases. A Gibbs free energy minimization approach was used to investigate the formation of the …
-
A 3-D tomographic survey of compound chondrules in two carbonaceous chondrites : Acfer 139 and Renazzo
… this method. A 3-D tomographic study of two CR carbonaceous meteorites, Acfer139 and Renazzo, reveals a higher frequency of compound chondrules in CR chondrites than in ordinary chondrites. Previous two-dimensional studies of compound chondrules are reexamined and two new categories, touching …
-
Water and volatile element accretion to the inner planets
… of this water and I suggest it is derived from carbonaceous chondrites. Chapter 4, 5, 6, and 7 addresses eucrite meteorites. Chapter 4 expands on existing models to explain geochemical trends observed in eucrites. In Chapter 5, I examine the water and F content of the eucrite parent body, 4 …
-
Water and volatile element accretion to the inner planets
… of this water and I suggest it is derived from carbonaceous chondrites. Chapter 4, 5, 6, and 7 addresses eucrite meteorites. Chapter 4 expands on existing models to explain geochemical trends observed in eucrites. In Chapter 5, I examine the water and F content of the eucrite parent body, 4 …
-
Using oxygen and carbon stable isotopes, 53Mn-53Cr isotope systematics, and petrology to constrain the history of carbonates and water in the CR and CM chondrite parent bodies
… isotopic study of carbonates in the paired CM1 chondrites, ALH 84049 and ALH 84051, in an effort to understand the origin and chronology of formation of carbonates in the most heavily altered CM chondrites. Dolomite is strongly compositionally zoned (Ca, Mg, Fe, Mn), indicating very …
-
Evolution Of Water Reservoirs In The Early Solar System Through Their Oxygen Isotopic Composition
… has been applied to three suites of meteorites: Carbonaceous chondrites (CI and CM), SNC meteorites (four meteorites) and a selection of Antarctic samples, three eucrites and one ordinary chondrite. Results were used to constrain models of the origin of Solar System water and its subsequent …
-
Noble gases anomalies in terrestrial ores and meteorites
… in the heavy xenon isotopes of primitive chondrites might arise from the spontaneous fission of a superheavy element. The alternate possibility of simple mass dependent fractionation causing this enrichment in the heavy xenon isotopes is examined through a review of the helium, neon and …
-
A near-ultraviolet spectroscopic survey of B-type asteroids
… in good agreement spectral slope variations of carbonaceous chondrites, particularly in the near-UV region. These results support the work of de Leon et al. (2012) and Alf-Lagoa et al. (2013) in identifying spectral slope variations and contributing to a three-part survey of B-type asteroids …
-
Constraining Planetary Science Problems with Micro-Paleomagnetism
… of three different components from CO carbonaceous chondrites: calcium-aluminum-rich inclusions, chondrules and matrix, with them we can measure the solar nebula magnetic field which have directs implications to planetary formation. This thesis is divided into 6 chapters. The first one …
-
Organic chemistry and mineral interactions in the solar system
… thus indicating a possible common origin. Carbonaceous chondrites, (which comprise a small proportion of meteorites), contain a few per cent of organic material, heterogeneously distributed within their structure, the major part being macromolecular ("insoluble organic material", lOM). …
-
Formation conditions of plagioclase-bearing type I chondrules in CO chondrites : a study of natural samples and experimental analogs
Chondrites are samples from undifferentiated asteroids that contain components that formed in the early solar system. One of the components found in chondrites is chondrules, which are small igneous spherules that formed from the melting of precursor dust ball assemblages during very short, …
-
Mineralogy and bulk chemistry of chondrules and matrix in petrologic type 3 chondrites : implications for early solar system processes
… various textural types in four petrologic type 3 chondrites: MET 00526 (L3.05), MET 00426 (CR3.0), Kainsaz (CO3.2) and Kakangari (K3). Bulk compositions of twenty chondrules in each meteorite were determined with modal recombination analysis. This study provides a self-consistent dataset that …
-
A TEM study of crystalline silicates in the matrices of MET 00426 and QUE 99177 CR3.0 chondrites: Constraints on the formation mechanisms of dust in the solar nebula
… "glue" for larger components. In the pristine chondrites (petrologic type 3.00) the matrix preserves some record of the primary characteristics of nebular dust. Two CR carbonaceous chondrites, MET 00426 (CR3.00) and QUE 99177 (CR3.00), are likely the most pristine meteorites ever described …
-
Thermal histories of CB meteorites: Constraints from compositions and microstructures of sulfides
CBs are metal-rich carbonaceous chondrites, and are subdivided into type CBa and CBb, which are primarily distinguished by the size of particles. Although CBs are classified as chondrites, the high abundance of metal (>40%) make them a distinct group of meteorites. The origin of CBs is highly …
-
Spectral Study of Asteroids and Laboratory Simulation of Asteroid Organics
… are most consistent with the DISM, and some carbonaceous chondrites. The band centers of the C-H stretch absorptions indicate that both asteroids may have aliphatic carriers chemically bonded to electronegative groups (i.e. aromatics), and some that are not. We also detect a 3.45 ?m feature …
-
Attempts to analyse D/H ratios of sub-micromole quantities of hydrogen : applications in the study of ordinary chondrites
… the highest whole-rock D/H ratio of the ordinary chondrites. It is also unusual in that it has undergone some mild aqueous alteration, previously considered a secondary process restricted to some deuterium-rich carbonaceous chondrites. Semarkona was chosen to be the object of a more detailed study …
-
THE CONCENTRATION OF HYDROGEN IN INCOMPLETELY AND WHOLLY MELTED TERRESTRIAL BUILDING BLOCKS
… of unmelted (i.e., chondritic) materials, namely carbonaceous chondrite-like (CC-like) materials, thought to be derived from the outer solar system, which have high H concentrations (up to ~14 wt. % H2O; total H as H2O equivalents) and similar H isotopic compositions to the bulk Earth. …
Page 1 of 2