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Presolar SiC in chondrites: How variable and how many sources?

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(PDF) SiC in the ordinary chondrites - ResearchGate | Share and discover resear

SiC in the ordinary chondrites Article (PDF Available) in Meteoritics 24:247 · November 1989 with 15 Reads Cite this publication ... Presolar SiC in chondrites: How variable and how many sources? Article Jun 1993 GEOCHIM COSMOCHIM AC Conel M. O'D ...

Stardust in meteorit

primitive meteorites are presolar. For many years, not much pro-gress was made on deeper understanding of diamond, because ... presolar SiC grains.While someoftheseelements havebeenmea-sured by ion microprobe, advanced techniques such as resonant ...

Presolar diamond, SiC, and graphite in primitive chondrites: Abundances as a function of meteorite class and petrologic type ...-W | DeepDy

Read "Presolar diamond, SiC, and graphite in primitive chondrites: Abundances as a function of meteorite class and petrologic type, ... Presolar SiC in chondrites: How variable and how many sources? Alexander, C.M.O'D. The microstructure of Semarkona and ...

NAVER Academic > Presolar grains from meteorites: Remnants from the early times of the solar syst

We describe the search for the presolar components, the currently known presolar mineral populations, ... Presolar SiC in chondrites: How variable and how many sources? (1993) O'D Alexander C.M General Works cited 0 times 4. The Galactic Evolution of Si ...

NAVER Academic > Trends in the study of presolar dust grains from primitive meteorit

An example is the distribution of Si isotopic ratios in individual mainstream SiC grains for which many different theoretical explanations have been offered. There are still many unsolved problems posed by the grain data, the most difficult being the interpretation of ...

NUCLEOSYNTHETIC Os ISOT OPIC ANOMALIES IN CARBONACEOUS CHONDRITES. T. Yokoyama , M. H. Thiemens , and R. J. Walker Dept. of Chemistry DTM .

Because presolar SiC grains are extremely acid resistant and strongly enriched in s-process nuclides [1], it was concluded that the s-process deficits reflected incomplete acid dissolution of the chondrites with acid insoluble SiC hosting the not directly detects ...

Isotopes of Volatiles in Pre-Solar Grains | SpringerLi

Elements usually considered volatile are key constituents (C, N, O) of the pre-solar grains identified in primitive meteorites and/or key diagnostic elements (noble gases). ...

Presolar SiC in chondrites: How variable and how many source

Abstract The carbon and silicon isotopic compositions of 246 isotopically anomalous SiC grains found in relatively low concentration acid residues prepared from nine chondrites are reported. However, two of these residues, from Leoville (CV3) and Qingzhen (EH3 ...

Alexander, Conel M. O'

PRESOLAR SIC IN CHONDRITES - HOW VARIABLE AND HOW MANY SOURCES. Geochimica et Cosmochimica Acta. 57:2869-2888. Polymorphism in presolar Al(2)O(3) grains from asymptotic giant branch stars ...

Presolar silicon carbide grains and their parent stars, Meteoritics & Planetary Science | 10.1111/j.1945-5100.1998.tb01693.x | DeepDy

Read "Presolar silicon carbide grains and their parent stars, Meteoritics & Planetary Science" on DeepDyve, ... Presolar SiC in chondrites: How variable and how many sources Alexander, Alexander Interstellar grains in primitive meteorites: Diamond, silicon ...

Chondrite - Wikiped

due to the accretion of ice along with rocky material. As a result, many chondrites contain hydrous minerals, ... with CH and especially CB chondrites having a higher proportion of metal than all other chondrite groups. Although CR chondrites are the ...

Diverse supernova sources of pre-solar material inferred from molybdenum isotopes in meteorites | Natu

Diverse supernova sources of pre-solar material inferred from molybdenum isotopes in meteorites Skip to main content ... The most primitive meteorites, the carbonaceous chondrites, are primarily mixtures of many distinct materials that reflect a variety of solar ...

COORDINATED ANALYSES OF PRESOLAR GRAINS IN THE ALLAN HILLS 77307 AND QUEEN ELIZABETH RANGE 99177 METEORIT

Coordinated Analyses of Presolar Grains in the Allan Hills 77307 and Queen Elizabeth Range 99177 Meteorites Short Title: ... on the basis of exotic noble gas signatures in presolar diamond, SiC, and graphite (Amari et al. 1990; Bernatowicz et al. 1987; Lewis ...

Chondrite - Wikiped

As a result, many chondrites contain hydrous minerals, such as clays, that formed when the water interacted with the rock on the asteroid in a process known as ...

On laboratory studies of grains from outside the solar system | SpringerLi

Alexander C M O’D 1993 Presolar SiC in chondrites: how variable and how many sources?;Geochim. Cosmochim. Acta 57 2869–2888 CrossRef Google Scholar ...

Presolar silicon carbide grains and their parent stars - LODDERS - 1998 - Meteoritics & Planetary Science - Wiley Online Libra

Presolar silicon carbide grains and their parent stars Authors ...

Presolar silicate and oxide abundances and compositions in the ungrouped carbonaceous chondrite Adelaide and the K chondrite Kakangari: The .

chondrite NWA 852 has lower presolar silicate abundances (approximately 75 ppm) and a low silicate⁄oxide ratio, indicating more aqueous alteration than the CR3 chondrites (Leitner et al. 2012). The presolar silicates in these meteorites therefore present

Presolar SiC in chondrites - How variable and how many source

Abstract The carbon and silicon isotropic compositions of 246 isotopically anomalous SiC grains measured in low concentration residues are reported. The residues were prepared from nine chondrites, namely, 6 unequilibrated ordinary chondrites (UOCs), Qingzhen ...

Reference’List’–’Presolar’Grain’Database’(November’2014)’ SiliconCarbi

(1993)! Presolar! SiC! in! chondrites:! ! how! variable! and! how! many! sources?!!Geochim.*Cosmochim.*Acta!57,2869G2888.!! Alexander! C.! M.! O’D.! (1994)! Trace! element! distributions! within! ordinary! chondrite ...

Presolar grains in meteorites: an overview and some implications - ScienceDire

Graphite has probably the most diverse range of sources among the identified presolar grains. Presolar graphite grains (Amari et al., 1990; Hoppe et al., ...

(PDF) Presolar SiC in chondrites: How variable and how many sources? | Conel M O Alexander - Academia.e

Presolar SiC in chondrites: How variable and how many sources? Geochimica et Cosmochimica Acta, 1993 Conel M O Alexander Download with Google Download with Facebook or download with email ...