Mechanism of formation of glass with embedded metal and sulfides

被引：39

作者：

Bradley, JP ^{[1
]}

Dai, ZR ^{[1
]}

机构：

[1] Lawrence Livermore Natl Lab, Inst Geophys & Planetary Phys, Livermore, CA 94551 USA

来源：

ASTROPHYSICAL JOURNAL | 2004年 / 617卷 / 01期

关键词：

astrochemistry; dust; extinction; interplanetary medium; methods : laboratory;

D O I：

10.1086/425292

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

GEMS (glass with embedded metal and sulfides) grains in interplanetary dust particles (IDPs) were examined using 200 keV analytical transmission electron microscopy. The morphologies and crystallography of embedded relict grains reveal that GEMS are pseudomorphs formed by irradiation processing of crystals free-floating in space. Some GEMS retain a compositional and morphological "memory'' of the crystal from which they formed. Pseudomorphism may rule out condensation, annealing, flash heating, or shock melting as alternative mechanisms of GEMS formation. A significant and often dominant fraction of the atoms in GEMS were sputter-deposited from other grains. Therefore, a normal (solar) isotopic composition is not a reliable indicator of whether GEMS formed in the solar system or in presolar interstellar or circumstellar environments.

引用

页码：650 / 655

页数：6

共 29 条

[1]

Bradley JP, 2005, TREATISE GEOCHEM, V1, P689

[2] COMBINED INFRARED AND ANALYTICAL ELECTRON-MICROSCOPE STUDIES OF INTERPLANETARY DUST PARTICLES [J].

BRADLEY, JP ;

HUMECKI, HJ ;

GERMANI, MS .

ASTROPHYSICAL JOURNAL, 1992, 394 (02) :643-651

[3] An infrared spectral match between GEMS and interstellar grains [J].

Bradley, JP ;

Keller, LP ;

Snow, TP ;

Hanner, MS ;

Flynn, GJ ;

Gezo, JC ;

Clemett, SJ ;

Brownlee, DE ;

Bowey, JE .

SCIENCE, 1999, 285 (5434) :1716-1718

[4] CHEMICALLY ANOMALOUS, PREACCRETIONALLY IRRADIATED GRAINS IN INTERPLANETARY DUST FROM COMETS [J].

BRADLEY, JP .

SCIENCE, 1994, 265 (5174) :925-929

[5] PYROXENE WHISKERS AND PLATELETS IN INTERPLANETARY DUST - EVIDENCE OF VAPOR-PHASE GROWTH [J].

BRADLEY, JP ;

BROWNLEE, DE ;

VEBLEN, DR .

NATURE, 1983, 301 (5900) :473-477

[6] DISCOVERY OF NUCLEAR TRACKS IN INTERPLANETARY DUST [J].

BRADLEY, JP ;

BROWNLEE, DE ;

FRAUNDORF, P .

SCIENCE, 1984, 226 (4681) :1432-1434

[7] Surface of young Jupiter family comet 81 P/Wild 2: View from the Stardust spacecraft [J].

Brownlee, DE ;

Horz, F ;

Newburn, RL ;

Zolensky, M ;

Duxbury, TC ;

Sandford, S ;

Sekanina, Z ;

Tsou, P ;

Hanner, MS ;

Clark, BC ;

Green, SF ;

Kissel, J .

SCIENCE, 2004, 304 (5678) :1764-1769

[8] COSMIC DUST - COLLECTION AND RESEARCH [J].

BROWNLEE, DE .

ANNUAL REVIEW OF EARTH AND PLANETARY SCIENCES, 1985, 13 :147-173

[9]

BROWNLEE DE, 1995, LUNAR PLANET SCI, V26, P183

[10] Iron-nickel sulfides in anhydrous interplanetary dust particles [J].

Dai, ZR ;

Bradley, JP .

GEOCHIMICA ET COSMOCHIMICA ACTA, 2001, 65 (20) :3601-3612

← 1 2 3 →