scholarly journals Isotopic analysis of early solar system objects by an ion microprobe: Parametric studies and initial results

1994 ◽  
Vol 103 (1) ◽  
pp. 57-82
Author(s):  
J N Goswami ◽  
G Srinivasan
Keyword(s):  
Solar System ◽  
Isotopic Analysis ◽  
Ion Microprobe ◽  
Early Solar System ◽  
Solar System Objects ◽  
Parametric Studies ◽  
Initial Results

Laboratory and in-situ analysis of comet dust

1988 ◽  
Vol 46 ◽  
pp. 8-9
Author(s):  
D.E. Brownlee ◽  
A.L. Albee
Keyword(s):  
Electron Microscopy ◽  
Solar System ◽  
Laboratory Study ◽  
Isotopic Analysis ◽  
Building Blocks ◽  
Sem Analysis ◽  
Early Solar System ◽  
Cometary Material ◽  
Comet Dust

Comets are primitive, kilometer-sized bodies that formed in the outer regions of the solar system. Composed of ice and dust, comets are generally believed to be relic building blocks of the outer solar system that have been preserved at cryogenic temperatures since the formation of the Sun and planets. The analysis of cometary material is particularly important because the properties of cometary material provide direct information on the processes and environments that formed and influenced solid matter both in the early solar system and in the interstellar environments that preceded it.The first direct analyses of proven comet dust were made during the Soviet and European spacecraft encounters with Comet Halley in 1986. These missions carried time-of-flight mass spectrometers that measured mass spectra of individual micron and smaller particles. The Halley measurements were semi-quantitative but they showed that comet dust is a complex fine-grained mixture of silicates and organic material. A full understanding of comet dust will require detailed morphological, mineralogical, elemental and isotopic analysis at the finest possible scale. Electron microscopy and related microbeam techniques will play key roles in the analysis. The present and future of electron microscopy of comet samples involves laboratory study of micrometeorites collected in the stratosphere, in-situ SEM analysis of particles collected at a comet and laboratory study of samples collected from a comet and returned to the Earth for detailed study.

scholarly journals A renewed search for short-lived 126Sn in the early Solar System: Hydride generation MC-ICPMS for high sensitivity Te isotopic analysis

2017 ◽  
Vol 201 ◽  
pp. 331-344 ◽  
Author(s):  
Gregory A. Brennecka ◽  
Lars E. Borg ◽  
Stephen J. Romaniello ◽  
Amanda K. Souders ◽  
Quinn R. Shollenberger ◽  
...  
Keyword(s):  
Solar System ◽  
Hydride Generation ◽  
High Sensitivity ◽  
Isotopic Analysis ◽  
Early Solar System

scholarly journals Aluminum-26 chronology of dust coagulation and early solar system evolution

2019 ◽  
Vol 5 (9) ◽  
pp. eaaw3350 ◽  
Author(s):  
M.-C. Liu ◽  
J. Han ◽  
A. J. Brearley ◽  
A. T. Hertwig
Keyword(s):  
Solar System ◽  
Time Scales ◽  
Time Scale ◽  
Isotopic Analysis ◽  
Class I ◽  
Terrestrial Planets ◽  
The Sun ◽  
Early Solar System ◽  
System Evolution ◽  
Time Gap

Dust condensation and coagulation in the early solar system are the first steps toward forming the terrestrial planets, but the time scales of these processes remain poorly constrained. Through isotopic analysis of small Ca-Al–rich inclusions (CAIs) (30 to 100 μm in size) found in one of the most pristine chondrites, Allan Hills A77307 (CO3.0), for the short-lived 26Al-26Mg [t1/2 = 0.72 million years (Ma)] system, we have identified two main populations of samples characterized by well-defined 26Al/27Al = 5.40 (±0.13) × 10−5 and 4.89 (±0.10) × 10−5. The result of the first population suggests a 50,000-year time scale between the condensation of micrometer-sized dust and formation of inclusions tens of micrometers in size. The 100,000-year time gap calculated from the above two 26Al/27Al ratios could also represent the duration for the Sun being a class I source.

scholarly journals 6. Condensation and/or Metamorphism: Genesis of E- and L-Group Chondrites from Studies on Artificially Heated Primitive Congeners

1977 ◽  
Vol 39 ◽  
pp. 375-383
Author(s):  
M. E. Lipschutz ◽  
M. Ikramuddin
Keyword(s):  
Trace Elements ◽  
Solar System ◽  
Compositional Data ◽  
Condensation Process ◽  
Early Solar System ◽  
Volatile Element ◽  
Solar System Objects ◽  
Trace Element Contents ◽  
Element Contents ◽  
Apparent Activation Energies

Primitive chondrites heated for one week under conditions reasonable for early solar system objects readily lose volatile/mobile trace elements, e.g., Ag, Bi, Cs, Ga, In, Se, Te, Tl and Zn. Trace element contents decrease by 10-100x progressively with temperature up to 1000° C; apparent activation energies calculated from these data suggest bonding differences between chondrites. Comparison of data for E3-6 chondrites and heated Abee (E4) indicates that volatile/mobile trace elements in E-group chondrites reflect metamorphic loss from a parent object; prior nebular cosmochemical fractionation modified non-volatile element contents. Apparently L3-6 chondrites escaped such open-system metamorphism. Information on nebular condensation process(es) may be gained from L-group compositional data; only nonvolatile elements in E-group chondrites should be used for this purpose, however.

Ion microprobe studies of Efremovka CAIs: II. Potassium isotope composition and 41Ca in the early Solar System

1996 ◽  
Vol 60 (10) ◽  
pp. 1823-1835 ◽  
Author(s):  
G. Srinivasan ◽  
S. Sahijpal ◽  
A.A. Ulyanov ◽  
J.N. Goswami
Keyword(s):  
Solar System ◽  
Isotope Composition ◽  
Ion Microprobe ◽  
Early Solar System
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