原行星盘中球粒陨石组分的空气动力学再分配
On the aerodynamic redistribution of chondrite components in protoplanetary disks
摘要：
尽管原始陨石（陨石）的成分大致与太阳相同，但它们在化学、同位素和岩相学性质上存在差异，特别是碳质陨石和非碳质陨石之间的一级二分法。在这里，我们调查分析的动力学的组成部分（球粒，耐火夹杂物，金属/硫化物和基质颗粒）在原行星盘之前，他们在球粒陨石母体纳入。我们发现的动力学的固体，受气体阻力，基本上是由“气固解耦参数”$S\equiv \textrm{St}/α$，无量纲停止时间的湍流参数的比率控制。当$S$超过1时，固体颗粒相对于气体的解耦是显著的。预计$S$将随着时间和日心距离的增加而增加。根据（i）难熔包裹体的丰度、（ii）基质的比例、（iii）亲石元素丰度和（iv）球粒的氧同位素组成，我们认为非基质的变质组分在碳质辉长岩增生时具有$S<1$，而在其他辉长岩增生时具有$S>1$。这表明，平均而言，碳质方解石的增生早于其他方解石，难熔包裹体与其宿主碳质方解石有遗传关系。
英文摘要：
Despite being all roughly of solar composition, primitive meteorites (chondrites) present a diversity in their chemical, isotopic and petrographic properties, and in particular a first-order dichotomy between carbonaceous and non-carbonaceous chondrites. We investigate here analytically the dynamics of their components (chondrules, refractory inclusions, metal/sulfide and matrix grains) in protoplanetary disks prior to their incorporation in chondrite parent bodies. We find the dynamics of the solids, subject to gas drag, to be essentially controlled by the "gas-solid decoupling parameter" $S\equiv \textrm{St}/α$, the ratio of the dimensionless stopping time to the turbulence parameter. The decoupling of the solid particles relative to the gas is significant when $S$ exceeds unity. $S$ is expected to increase with time and heliocentric distance. On the basis of (i) abundance of refractory inclusions (ii) proportion of matrix (iii) lithophile element abundances and (iv) oxygen isotopic composition of chondrules, we propose that non-matrix chondritic components had $S<1$ when carbonaceous chondrites accreted and $S>1$ when the other chondrites accreted. This suggests that accretion of carbonaceous chondrites predated on average that of the other chondrites and that refractory inclusions are genetically related to their host carbonaceous chondrites.
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