Zobrazeno 1 - 10
of 654
pro vyhledávání: '"Denton S"'
Autor:
Ebel, Denton S., Grossman, Lawrence
Publikováno v:
Geology 33: 293-296 (2005)
Formation of the giant Chicxulub crater off Mexico's Yucatan Peninsula coincided with deposition of the global Ir-rich Cretaceous-Tertiary (K-T) stratigraphic boundary layer at ca. 65 Ma. The boundary is marked most sharply by abundant spherules cont
Externí odkaz:
http://arxiv.org/abs/2407.14523
Autor:
Ebel, Denton S., Gemma, Marina E., Alpert, Samuel P., Bayron, Jasmine, Lobo, Ana H., Weisberg, Michael K.
Abundances, apparent sizes, and individual chemical compositions of chondrules, refractory inclusions, other objects and surrounding matrix have been determined for Semarkona (LL3.00) and Renazzo (CR2) using consistent methods and criteria on x-ray e
Externí odkaz:
http://arxiv.org/abs/2407.05199
Autor:
Bu, Caixia, Morrissey, Liam S., Bostick, Benjamin C., Burger, Matthew H., Bowen, Kyle P., Chillrud, Steven N., Domingue, Deborah L., Dukes, Catherine A., Ebel, Denton S., Harlow, George E., Hillenbrand, Pierre-Michel, Ivanov, Dmitry A., Killen, Rosemary M., Ross, James M., Schury, Daniel, Tucker, Orenthal J., Urbain, Xavier, Zhang, Ruitian, Savin, Daniel W.
We have measured the absolute doubly differential angular sputtering yield for 20 keV Kr+ impacting a polycrystalline Cu slab at an incidence angle of {\theta}i = 45{\deg} relative to the surface normal. Sputtered Cu atoms were captured using collect
Externí odkaz:
http://arxiv.org/abs/2312.12208
Autor:
Ebel, Denton S., Sack, Richard O.
Publikováno v:
Contributions to Mineralogy and Petrology 166: 923-934 (2013)
Djerfisherite is an important carrier of potassium in highly reduced enstatite chondrites, where it occurs in sub-round metal-sulfide nodules. These nodules were once free-floating objects in the protoplanetary nebula. Here, we analyze existing and n
Externí odkaz:
http://arxiv.org/abs/2308.03206
Autor:
Greenberg, Michael, Ebel, Denton S.
Publikováno v:
Geosphere 6: 515-523 (2010)
We report non-destructive 3-dimensional imaging and analysis techniques for material returned by the Stardust cometary collector. Our technique utilizes 3-dimensional laser scanning confocal microscopy (3D LSCM) to image whole Stardust tracks, in sit
Externí odkaz:
http://arxiv.org/abs/2308.03199
Publikováno v:
Planetary and Space Sciences 59: 1888-1894 (2011)
The origin of Mercury's anomalous core and low FeO surface mineralogy are outstanding questions in planetary science. Mercury's composition may result from cosmochemical controls on the precursor solids that accreted to form Mercury. High temperature
Externí odkaz:
http://arxiv.org/abs/2307.15763
Publikováno v:
Earth and Planetary Science Letters 411, 11-19 (2015)
One of the major unresolved problems in cosmochemistry is the origin of chondrules, once molten, spherical silicate droplets with diameters of 0.2 to 2 mm. Chondrules are an essential component of primitive meteorites and perhaps of all early solar s
Externí odkaz:
http://arxiv.org/abs/2307.02017
Autor:
Greenberg, Michael, Ebel, Denton S.
Publikováno v:
Meteoritics and Planetary Science 47, 634-648 (2012)
The Stardust mission captured comet Wild 2 particles in aerogel at 6.1 km/sec. We performed high resolution three-dimensional imaging and X-ray fluorescence mapping of whole cometary tracks in aerogel. We present the results of a survey of track stru
Externí odkaz:
http://arxiv.org/abs/2307.02014
Publikováno v:
Meteoritics and Planetary Sciences 47, 585-593 (2012)
Low-iron, manganese-enriched (LIME) olivine grains are found in cometary samples returned by the Stardust mission to comet 81P/Wild 2. Similar grains are found in primitive meteoritic clasts and unequilibrated meteorite matrix. LIME olivine is thermo
Externí odkaz:
http://arxiv.org/abs/2307.00652
Publikováno v:
Geochimica et Cosmochimica Acta 142, 27-38 (2014)
Condensation models describe the equilibrium distribution of elements between coexisting mineral solid solutions, silicate liquid, and vapor in a closed chemical system, vapor phase always present, using equations of state of the phases involved at a
Externí odkaz:
http://arxiv.org/abs/2307.00643