منابع مشابه
Carbonaceous Nanospheres in Chondrites
Introduction: In the 1960s, prior to the widespread use of TEMs, several papers described rounded, micron-sized organic particles from carbonaceous chondrite (CC) meteorites [1-3]. Some of these particles were hollow. Except for two early TEM studies [4, 5], the rounded structures were essentially neglected until similar material was discovered in the Tagish Lake meteorite [6]. We subsequently ...
متن کاملSpectral reflectance properties of carbonaceous chondrites: 3. CR chondrites
Powdered samples of a suite of 14 CR and CR-like chondrites, ranging from petrologic grade 1 to 3, were spectrally characterized over the 0.3–2.5 lm interval as part of a larger study of carbonaceous chondrite reflectance spectra. Spectral analysis was complicated by absorption bands due to Fe oxyhydroxides near 0.9 lm, resulting from terrestrial weathering. This absorption feature masks expect...
متن کاملSpectral reflectance properties of carbonaceous chondrites: 8. ‘‘Other’’ carbonaceous chondrites: CH, ungrouped, polymict, xenolithic inclusions, and R chondrites
Department of Geography, University of Winnipeg, 515 Portage Avenue, Winnipeg, Manitoba, Canada R3B 2E9 Astromaterials Research and Exploration Science Office, NASA Johnson Space Center, Mail Code KR, 2101 NASA Road 1, Houston, TX 77058-3696, USA Department of Geological Sciences, Brown University, Box 1846, Providence, RI 02912-1846, USA Department of Space Studies, University of North Dakota,...
متن کاملSpectral reflectance properties of carbonaceous chondrites: 7. CK chondrites
The reflectance spectra of 15 CK chondrites have been measured as part of an ongoing study of carbonaceous chondrite reflectance spectra. The available sample suite includes multiple grain sizes and samples with petrologic grades varying from CK4 to CK6. CK reflectance spectra are all characterized by an olivineassociated absorption band in the 1.05 lm region. Compared to pure olivine, CK spect...
متن کاملSpectral reflectance properties of carbonaceous chondrites: 6. CV chondrites
Multiple reflectance spectra of 11 CV chondrites have been measured to determine spectral–compositional relationships for this meteorite class and to aid the search for CV parent bodies. The reflectance of CV chondrite spectra is variable, ranging from 5% to 13% at 0.56 lm, and 5% to 15% at the 0.7 lm region local reflectance maximum. Overall slopes range from slightly blue to red for powders, ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Proceedings of the Japan Academy, Series B
سال: 1990
ISSN: 0386-2208,1349-2896
DOI: 10.2183/pjab.66.183