Photochemical Mass-Independent Sulfur Isotopes in Achondritic Meteorites
Photochemical Mass-Independent Sulfur Isotopes in Achondritic Meteorites
复制标题
无球粒陨石中光化学质量无关的硫同位素
作者：
V. K. Rai;T. Jackson;M. Thiemens
与原始球粒陨石和陆地标准相比，4个无球粒陨石群的硫化物富集33S（高达0.040 / mil）。恒星核合成和宇宙射线散裂被排除为异常的原因，但早期太阳星云中的光化学反应可能产生同位素组成。诺顿县辉长岩中存在大量过量的33S（每毫升0.161），这表明从碳氧比增强的星云气体中凝聚而来的难熔硫化物矿物，但除此之外，太阳成分是载体。陨石中独立于质量的硫效应的存在，证明了一个类似的过程，可以解释在原始球粒陨石中难熔包裹体中观察到的氧同位素异常。
Sulfides from four achondrite meteorite groups are enriched in 33S (up to 0.040 per mil) as compared with primitive chondrites and terrestrial standards. Stellar nucleosynthesis and cosmic ray spallation are ruled out as causes of the anomaly, but photochemical reactions in the early solar nebula could produce the isotopic composition. The large 33S excess present in oldhamite from the Norton County aubrite (0.161 per mil) suggests that refractory sulfide minerals condensed from a nebular gas with an enhanced carbon-oxygen ratio, but otherwise solar composition is the carrier. The presence of a mass-independent sulfur effect in meteorites argues for a similar process that could account for oxygen isotopic anomalies observed in refractory inclusions in primitive chondrites.
影响因子：
3.2
作者：
V. Mannings;A. Boss;S. Russell
通讯作者：
V. Mannings;A. Boss;S. Russell