VERIFICATION AND INTERPRETATION OF THE I-XE CHRONOMETER
VERIFICATION AND INTERPRETATION OF THE I-XE CHRONOMETER
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I-XE 天文台表的验证和解释
DOI：
10.1016/s0016-7037(98)00314-7
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发表时间：
1999
影响因子：
5
通讯作者：
C. Hohenberg
中科院分区：
文献类型：
--
作者：
R. Brazzle;O. Pravdivtseva;A. Meshik;C. Hohenberg
本文对12块不同陨石中的磷酸盐和长石的I-Pb和Pb-Pb相对年龄进行了比较。在所有情况下，可以在磷酸盐中测量I-Pb，I-Pb和Pb-Pb计时器在实验不确定度范围内一致。未观察到不一致的磷酸盐样品。除Allegan外，长石分离物的I-Pb年龄一般与相应磷酸盐的Pb-Pb年龄一致。I-Pb和Pb-Pb计时器之间的一般一致性表明，I-Pb系统是一个可靠的和可解释的计时器时，适用于单一的矿物系统。Allegan长石与其他长石分离物不同，比其磷酸盐早1017 Ma，其I-同位素年龄与Orgueil和Murchison磁铁矿的I-同位素年龄无法区分，这是最古老的观察到的。
Comparisons of I-Xe and Pb-Pb relative ages are made for phosphate and feldspar separates from 12 different meteorites. In all cases where I-Xe ages can be measured in phosphate, I-Xe and Pb-Pb chronometers agree within experimental uncertainty. No discordant phosphate samples are observed. With the exception of Allegan, I-Xe ages for feldspar separates generally agree with Pb-Pb ages for the corresponding phosphate. The general concordancy observed between I-Xe and Pb-Pb chronometers suggests that the I-Xe system is a reliable and interpretable chronometer when applied to single minerals systems. Allegan feldspar differs from the other feldspar separates, predating its phosphate by ∼17 Ma, with an I-Xe age indistinguishable from those of Orgueil and Murchison magnetites, among the oldest observed.