PHYSICAL PROPERTIES OF METEORITES AND INTERPLANETARY DUST PARTICLES: CLUES TO THE PROPERTIES OF THE METEORS AND THEIR PARENT BODIES
PHYSICAL PROPERTIES OF METEORITES AND INTERPLANETARY DUST PARTICLES: CLUES TO THE PROPERTIES OF THE METEORS AND THEIR PARENT BODIES
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陨石和行星际尘埃粒子的物理特性：流星及其母体特性的线索
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发表时间：
2006
期刊：
影响因子：
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通讯作者：
G. Flynn
中科院分区：
文献类型：
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作者：
G. Flynn
摘要：被认为是小行星样本的直径通常为1厘米或更大的气象星，以及被认为是样本小行星和彗星的大小通常为5-50μm的行星际尘埃粒子(IDP)跨越了流星的大小范围。因此，陨石和国内流离失所者的物理性质可能会限制流星及其母体的性质。对球粒陨石的密度、孔隙率、纵向和横向声速、弹性模数和体积模数的测量以及内部结构的计算机显微层析成像表明，未风化的球粒陨石样品比致密的陆相岩石更多孔，声速更低。总体而言，境内流离失所者甚至比球粒陨石更容易渗透。对于无水普通球粒陨石，产生勉强灾难性破坏(Q*D)所需的单位目标质量的撞击能量是陆地玄武岩或玻璃的两倍，这表明无水陨石的碰撞破坏比致密玄武岩需要更多的能量。这些结果表明，大多数石头陨石很可能是弱的、多孔的物体，无水石头陨石的母体可能比致密的陆地玄武岩更难被破坏。
Abstract.Meteorites, generally 1 cm or larger in size that are believed to sample asteroids, and interplanetary dust particles (IDPs), generally 5–50 μm in size that are believed to sample both asteroids and comets, span the size range of the meteors. Thus, the physical properties of the meteorites and the IDPs are likely to constrain the properties of the meteors and their parent bodies. Measurements of the density, porosity, longitudinal and transverse speeds of sound, elastic modulus, and bulk modulus, as well as imaging of the internal structure by Computed Microtomography indicate that unweathered samples of chondritic meteorites are more porous and have lower sound velocities than compact terrestrial rocks. In general, the IDPs are even more porous than the chondritic meteorites. The impact energy per unit target mass required to produce a barely catastrophic disruption (Q*D) for anhydrous ordinary chondrite meteorites is twice that for terrestrial basalt or glass, indicating that collisional disruption of anhydrous meteorites requires more energy than for a compact basalt. These results indicate that most stone meteors are likely to be weak, porous objects, and that the parent bodies of the anhydrous stone meteorites are likely to be more difficult to disrupt than compact terrestrial basalt.