X-Wind模式下对宁强碳质球粒陨石光学特征的重新认识

宁强碳质球粒陨石非偏振光、偏正光、反射光下的矿物、组构的光学特征中蕴藏着丰富的有关太阳星云演化初期不挥发组分吸积时的动力、温度、压力、介质信息．在宁强陨石双面抛光片中,矿物组构混杂堆积的构造反映了太阳星云吸积盘上极弱的机械动力环境和近物源吸积作用;外形不规则,边缘参差的矿物集合体和矿物碎片应该是抛落时碰撞破碎的球粒,这些球粒形成于X-Wind模式中的X-区,并被双极喷流抛落到太阳星云的不同部位;在透射光下,从宁强陨石中首次发现存在有玻璃、结晶、及气相包裹体,它们可以反映出太阳星云演化过程中的物质成分、热力学、动力学信息,应该引起重视．实验观察中还发现同一个球粒中锯齿状缝合线连接的橄榄石栅条和橄榄石颗粒．诸多现象需要理论物理、天体物理观察和天体化学实验的科学家共同努力去探讨.X-Wind模式中许多细节有待天体化学实验去检验、补充和完善．

A New Cognition of Optic Characteristic of Ningqiang Carbon Chondrite with X-wind Model

Optic characteristics of mineral and constituents of Ningqiang carbon chon-drite from unpolarized transmitted light, crossed Nicols and reflected light contain abundant information about dynamic, temperature, pressure and medium in early solar system. In both-side-polished thin sections, melange texture of mineral and constituents suggest the accretion is near source at low mechanical power. Otherwise, irregularly-shaped mineral aggregates and fragments should be broken chondrules, which had formed in X-region of X-wind model and was injected into different position of solar nebular midplane by bipolar jets . In transmitted light, amorphousness inclusions, microcrystal inclusions and gas inclusions was found in Ningqiang meterorite for the first time, which could reveal information about component and thermodynamics in the solar nebula, and shoud be attached importance to. A chondrule in which olivine bars sewed with olivine grains by serrational furrow line was observed,which indicate X-wind model is waiting for being refined by cosmochemistry experiments.