Results 91 to 100 of about 37,548 (250)

Silica in Protoplanetary Disks

, 2008
Mid-infrared spectra of a few T Tauri stars (TTS) taken with the Infrared Spectrograph (IRS) on board the Spitzer Space Telescope show prominent narrow emission features indicating silica (crystalline silicon dioxide).
A. Li, A. R. Basu, Alexander, Armus, B. A. Sargent, Barkume, Barsony, Benzerara, Binns, Bohren, Bouvier, Bowen, Bowen, Brearley, C. J. Bohac, C. Tayrien, Calvet, Calvet, Chen, Chiar, Cohen, D'Alessio, D'Alessio, D. M. Watson, de Pater, de Zeeuw, Dodd, Dorschner, E. Furlan, Edgar, Emery, Fabian, Furlan, G. C. Sloan, Grün, Hanner, Harker, Harker, Heaney, Hemley, Henning, Herbig, Honda, Houck, J. D. Green, Jaeger, K. H. Kim, Kamp, Kastner, Kemper, Kimura, Klein, Koike, Li, Li, Luhman, Luhman, M. K. McClure, Marshall, Metchev, Mikouchi, Mutschke, Norton, P. Manoj, Palik, Pascucci, Pilipp, Plyusnina, Posch, Prato, Preibisch, Reipurth, Rietmeijer, Rietmeijer, Rietmeijer, Sargent, Schaefer, Silverstone, Tuttle, Uchida, W. J. Forrest, Werner, Wilking   +82 more
core   +1 more source

Composition and formation conditions of ilmenite and titanomagnenite mineralization in two-pyroxene gabbro Medvedevskoje deposit (Southern Urals). I. Petrochemical and geochemical characteristics of rocks and ores

Литосфера, 2015
In this paper based on new petrochemical and geochemical data with specificity in the compositions of rock-forming and ore minerals were determine the conditions of formation of Ti-Fe-V mineralization in the two-pyroxene gabbro of Medvedevskoje deposit ...
V. V. Holodnov, E. S. Shagalov, T. D. Bocharnikova, E. V. Konovalova   +3 more
doaj   +2 more sources

Lithium and carbon isotopic fractionations between the alteration assemblages of Nakhla and Lafayette [PDF]

, 2005
Nakhla and Lafayette delta 7Li values for samples and extracts (4.1-14.2�) are consistent with brine evaporation.
Baker, L., Bridges, J. C., James, R. H., Pearson, V. K., Verchovsky, A. B., Wright, I. P.   +5 more
core  

Trace elements in the silicate minerals of the Borodino Meteorite (Н5)

Записки Горного института
Major (EPMA) and trace (SIMS) element geochemistry in olivine, low-Са pyroxene and mesostasis from porphyritic and barred chondrules, as well as the pyroxene-olivine aggregate and matrix of equilibrated ordinary Borodino chondrite (Н5) is discussed. No
Kristina G. Sukhanova
doaj  

Electron Microprobe Reintegration Method for Clinopyroxene Breakdown with Lamellae Exsolution

Yankuang ceshi
Pyroxene is an important rock-forming mineral in magmatic to metamorphic rocks, which often possesses certain breakdown texture with lamellae exsolution under temperature and pressure changes.
Xiaoli LI, Lifei ZHANG
doaj   +1 more source

A temporal study of oxygen-rich pulsating variable AGB star, T Cep: Investigation on dust formation and dust properties

, 2011
Pulsation is believed to be the leading cause of dusty mass loss from Asymptotic Giant Branch (AGB) stars. We present a temporal study of T Cep, a long-period Mira variable, using seven ISO SWS spectra, covering a 16-month period over a single pulsation ...
Angela K. Speck, Begemann, Begemann, Benitez, Blommaert, Bohren, Bohren, Bose, Cami, Cami, Cami, Castelaz, Chiar, Corman, Crovisier, de Graauw, DePew, Dijkstra, Gail, Gervais, Hao, Henning, Huffman, Isles, Jäger, Jäger, Kessler, Koike, Lebzelter, Lodders, Marsakova, McDonald, McDonald, Molster, Murata, Nogami, Onaka, Perrin, Perryman, Schweitzer, Sloan, Sloan, Sloan, Spoon, Stroud, Suklima Guha Niyogi, Takashi Onaka, Takigawa, Thompson, Tielens, Tsuji, Van Malderen, Vollmer, Waelkens, Waters, Weigelt, Werner, Woolf, Yamamura, Zijlstra   +59 more
core   +1 more source

New Zealand's Second Meteorite: Makarewa (find, L4, S5, W2)

New Zealand Journal of Geology and Geophysics, Volume 69, Issue 1, March 2026.
One of the most remarkable discoveries of a meteorite in New Zealand was that of Makarewa. Discovered in 1879, Makarewa is a ‘find’ that was uncovered a metre below the surface of a clay bank during excavation works for a train line in the southern South Island.
Mia R. E. Boothroyd, James M. Scott, Marshall C. Palmer, Rasmus Andreason   +3 more
wiley   +1 more source

Study of the Extraterrestrial Materials at Antarctica, IV. : On the Yamato Meteorites

Antarctic Record, 1974
Additional mineralogical and chemical studies of the Yamato meteorites are under way. The mode analysis and the optical properties in thin sections are examined under a microscope.
Makoto SHIMA, Akihiko OKADA, Masako SHIMA   +2 more
doaj   +1 more source

Production rate calibration for cosmogenic ¹⁰Be in pyroxene by applying a rapid fusion method to ¹⁰Be-saturated samples from the Transantarctic Mountains, Antarctica [PDF]

Geochronology
Measurements of multiple cosmogenic nuclides in a single sample are valuable for various applications of cosmogenic nuclide exposure dating and allow for correcting exposure ages for surface weathering and erosion and establishing exposure–burial history.
M. Bergelin, G. Balco, G. Balco, L. B. Corbett, P. R. Bierman   +4 more
doaj   +1 more source

The composition and size distribution of the dust in the coma of comet Hale-Bopp

, 2005
We discuss the composition and size distribution of the dust in the coma of comet Hale-Bopp. We do this by fitting simultaneously the infrared emission spectrum measured by the infrared space observatory (ISO) and the measured degree of linear ...
de Koter, A., Dominik, C., Hovenier, J. W., Min, M., Waters, L. B. F. M.   +4 more
core   +1 more source