COMPOSITIONAL TRENDS IN ROCK-FORMING ELEMENTS OF COMET HALLEY DUST

被引:87
作者
FOMENKOVA, MN
KERRIDGE, JF
MARTI, K
MCFADDEN, LA
机构
[1] UNIV CALIF SAN DIEGO,CALIF SPACE INST,LA JOLLA,CA 92093
[2] UNIV CALIF SAN DIEGO,DEPT CHEM,LA JOLLA,CA 92093
关键词
D O I
10.1126/science.11538058
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
The VEGA 1 and 2 spacecraft flew by comet P/Halley in 1986 carrying, among other instruments, two mass spectrometers to measure the elemental composition of dust particles emitted from the comet. Most particles seem to be a mixture of silicates of variable magnesium-iron composition and organic matter. Comprehensive study of data and consideration of the mass of dust particles reveal cometary grains of "unusual" composition: magnesium-rich and iron-rich particles. Magnesium-rich particles are most likely magnesium carbonates, which could not have formed under conditions of equilibrium condensation but rather require formation by aqueous alteration. The composition of the iron-rich particles can also be related to secondary processes in the comet.
引用
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页码:266 / 269
页数:4
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