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 79 for “"Meteorite"”.
-
Tracing meteorite source regions through asteroid spectroscopy
By virtue of their landing on Earth, meteorites reside in near-Earth object (NEO) orbits prior to their arrival. Thus the population of observable NEOs, in principle, give the best representation of meteorite source bodies. By linking meteorites to NEOs, and linking NOEs to their most likely …
-
Forging asteroid-meteorite relationships through reflectance spectroscopy
… and near-Earth asteroids to determine plausible meteorite parent bodies. These spectra, when coupled with previously obtained visible data, allow for a better determination of asteroid mineralogies. Over half of the observed objects have estimated diameters less than 20 k-m. Many important …
-
Carbonyl transport of metal in meteorite parent bodies
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Earth and Planetary Sciences, 1981.
-
Classification of a Meteorite found near Colgate, North Dakota
<p>In 1999 a 39 Kg stony meteorite was found near Colgate, North Dakota, during the construction of a new house. The surface of the meteorite contains many shallow regmaglypts and a weathered crust with a reddish orange color to dark brown-red, and the interior reveals a high abundance of metallic …
-
Silicate meteorite structures and the origin of the meteorites
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Geology and Geophysics, 1958.
-
Multi-element isotopic analyses of presolar graphite grains from the Orgueil meteorite
This dissertation presents the results and implications of the isotopic analyses of presolar graphite grains from the primitive carbonaceous chondrite, Orgueil. Graphite grains from low- and high-density fractions were analyzed for C, N, O, Si, Al-Mg, K, Ca, and Ti isotopes. These analyses indicate …
-
A comparison of iddingsite alteration in two terrestrial basalts and the ALHA 77005 martian meteorite using Raman spectroscopy and electron microprobe analyses.
… with the iddingsite in the ALHA 77005 martian meteorite: a lherzolitic shergottite). Short laser Raman spectroscopic traverses: hundreds of μm long) across olivine alteration fronts provide information about changes in the mineral assemblage with alteration. Data from the Raman traverses are …
-
Morning light : the secret history of the Tagish Lake Fireball
… the fall, outdoorsman Jim Brook discovered black meteorites on the frozen surface of Tagish Lake, in northern British Columbia. He kept the stones pristine: frozen and untouched-a first for any meteorite fall. He made his discovery known to a few scientists only after they agreed to …
-
A systematic study of the spectral reflectivity characteristics of the meteorite classes with applications to the interpretation of asteroid spectra for mineralogical and petrological information,
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth and Planetary Science, 1974.
-
Noble gases: a record of the early solar system
"Analyses of the noble gases in samples of iron meteorites are presented which indicate the following: 1. The inclusions of iron meteorites contain noble gases with a wide range of isotopic compositions. 2. The noble gas concentration and isotopic anomalies arc often grossly inhomogeneously …
-
Structural observations and stratigraphic variability in Jurassic strata, Upheaval Dome, Canyonlands National Park, Utah, USA
… while the other proposes a catastrophic meteorite impact. (1) The seminal paper by Jackson et al. (1998) suggests that Upheaval Dome was created due to the growth and subsequent pinch-off of a salt diapir sourced from the Pennsylvanian Paradox Formation. Their conclusions were based on …
-
Synchrotron Based Infrared Microspectroscopy of Carbonaceous Chondrites.
… highly correlated with the hydration band in all meteorites. Negative correlation is observed between water+organics and carbonate bands in all meteorites. Two dimensional infrared maps for NWA 852 and Orgueil show that carbonates are spatially separated from water+organic combination, silicates, …
-
Laser induced breakdown spectroscopy of martian breccia Northwest Africa 7034: comparison with Mars Science Laboratory results
… 1.56-7 meters. At the same time, martian breccia meteorite Northwest Africa (NWA) 7034 was analyzed with the ChemCam engineering model laboratory LIBS instrument at Los Alamos National Laboratory (LANL) at a 1.6 m standoff distance under 7 Torr CO2. Each LIBS location was pulsed with 150 shots at …
-
The Elastic Properties of Carbonaceous Chondrites
… as reflected in the range of recovered meteorites. Size distributions of clasts of asteroid 25143 Itokawa (LL-chondrite) and Tagish Lake meteorites (ungrouped C2 carbonaceous chondrite) indicate variation in fragmentation behavior. The steeper size distribution of the carbonaceous …
-
GENETICS, AGES, AND CHEMICAL COMPOSITIONS OF IRON METEORITES
… of genetic isotopic compositions of iron meteorites with metal-silicate segregation ages suggests that the isotopic composition of the NC reservoir changed with time. By contrast, no such age-linked changes in the genetic isotopic compositions of iron meteorites from the CC reservoir are …
-
Remanent magnetization in angrite NWA 4931
… distances along a drilled core sample of the meteorite. The samples were then progressively demagnetized to isolate primary magnetization from contaminant overprints and to calculate paleofield intensity. Dust produced during the subsampling process was analyzed to determine that the …
-
Compositional Analysis of the Martian Meteorites Northwest Africa 6342 and Northwest Africa 10961
The most abundant type of meteorite that we have from Mars is the shergottite. This makes the study of shergottite samples invaluable to understanding the geological evolution of that planet. Electron microprobe analyses, bulk elemental composition calculation, and laser ablation-inductively …
-
Deciphering the thermal evolution of small planetary bodies.
The parent bodies of meteorites were the first bodies to form in our solar system and the building blocks of the terrestrial planets, as well as the cores of the gas giants. They also played an important role in the delivery of volatiles to the inner solar system planets, including the Earth. These …
-
Organic chemistry and mineral interactions in the solar system
… (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). Model compounds were covalently bonded to "molecular tags", atoms …
-
A multi-proxy study of the Kalkkop impact Crater Lake deposits in south-central South Africa: implications for late neogene climate evolution
… Crater Lake deposit formed as a result of a meteorite impact, and is situated ~51 km southwest of Graaff-Reinet in the Southern part of South Africa. The structure is about 650 m wide, and contains 90 m of lake deposits that are mainly carbonate precipitates. A 90 m sediment core from the …
Page 1 of 4