Shock metamorphic history of primitive meteorites: experimental approach

原始陨石的冲击变质历史：实验方法

基本信息

批准号：
16204042
负责人：
TOMEOKA Kazushige
金额：
$ 27.12万
依托单位：
Kobe University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
2004
资助国家：
日本
起止时间：
2004 至 2007
项目状态：
已结题

项目摘要

(1) Heating effects of an experimentally shocked hydrated chondrite: Comparison with micrometeorites: Our transmission electron microscope study of a hydrated porous meteorite experimentally shocked at pressures of 10-49 GPa shows that its mineralogy and texture are similar to those of micrometeorites. The results suggest that micrometeorites are likely to have gone through shock heating processes that took place during asteroidal impacts before atmospheric entry.(2) Microinclusion-rich vesicular olivine in CK4 chondrites: A product of shock at high temperature: Our transmission electron microscope study reveals that a CK4 chondrite contains a high abundance of unusual olivine that contains high densities of submicrometer-size vesicles and inclusions of a variety of minerals. The results suggest that the vesicular olivine was formed by crystallization of melts that were produced by shock at a high temperature.(3) Hydrothermal alteration experiments of enstatite: Implications for aqueous alteration in chondrites: Hydrothermal alteration experiments of enstatite were carried out at pH 0-14, at 100-300℃, and for 24-336 hours in order to provide constraints on aqueous alteration conditions of hydrated meteorites. The results indicate that alteration of enstatite is strongly dependent on pH. The results therefore suggest that the differences in phyllosilicate mineralogy among the different types of chondrite mainly resulted from different pH conditions of aqueous solutions.(4) Mineralogical investigation of Comet Wild 2 samples returned by Stardust: Our transmission electron microscope study of comet Wild 2 samples shows that they consist mainly of crystalline silicates and minor amounts of Fe-Ni sulfide and metal, and their mineralogical characteristics are similar to those of the carbonaceous chondrites. One olivine grain has a texture suggesting that the Wild2 particles experienced hypervelocity impacts before capture.

（1）实验性震动的水晶剂的标题效应：与微观的比较：我们的透射电子显微镜研究10-49 GPA的多孔陨石实验压力，表明纹理和质地表明Micrometeites可能是Thock Thock供热。在大气RY之前发生的小行星效果（2）ck4 Als中的小囊泡橄榄石在大气中发生了毒素。橄榄石是由ATA高温产生的熔体结晶形成的。为了在水合的陨石中提供限制。：我们对彗星野生野生的传输电子显微镜研究2个样品表明，它们消费者的晶体atte和少量的Fe-Ni硫化物和金属橄榄石粒具有质地，这表明野生2颗粒在捕获前会产生高速度影响。