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首页> 外文期刊>Physics of the Earth and Planetary Interiors: A Journal Devoted to Obsevational and Experimerntal Studies of the Chemistry and Physics of Planetary Interiors and Their Theoretical Interpretation >Cooling rate of chondrules in ordinary chondrites revisited by a new geospeedometer based on the compensation rule
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Cooling rate of chondrules in ordinary chondrites revisited by a new geospeedometer based on the compensation rule

机译：新的测速仪根据补偿规则重新探讨普通球粒岩中球粒的冷却速率

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摘要

For several decades efforts to constrain chondrite cooling rates from diffusion zoning in olivine gave rise to a range of values from 5 to 8400 K/h (Desch, SJ., Connolly Jr., H.C., 2002. A model for the thermal processing of particles in solar nebula shocks: application to cooling rates of chondrules. Meteorit. Planet. Sci. 37, 183-208; Greeney, S., Ruzicka, A., 2004. Relict forsterite in chondrules: implications for cooling rates. Lunar Planet. Sci. XXXV, abstract # 1246.). Such large uncertainties directly reflect the variability of diffusion data. Alternatively, from this variability results a compensation rule, log D-0 = a + bE (diffusion coefficients are written D=D-0 exp(-E/RT)). We test a new geospeemetry approach, based on this rule, on cooling of chondrules in chondrites, Sahara-97210 LL 3.2 and Wells LL 3.3. Greeney and Ruzicka (2004) matched Fe-Mg diffusion profiles in olivine from these chondrites with cooling rates between 200 and 6000 K/h. In our geospeedometry model, the use of the compensation rule greatly reduces the uncertainties by avoiding the choice of one diffusion coefficient among many. The cooling rates we found are between 700 and 3600 K/h for Sahara and 700-1600 K/h for Wells. Finally, we discuss the influence of our analytical model parameters on our cooling rate estimates.
机译：几十年来，为限制球粒陨石冷却速率（从橄榄石中的扩散区域划分）而产生的数值范围为5至8400 K / h（Desch，SJ。，Connolly Jr.，HC，2002。用于粒子热处理的模型）太阳星云冲击的研究：对陨石冷却速率的应用。Meteorit。Planet。Sci。37，183-208; Greeney，S.，Ruzicka，A.，2004.陨石残留的镁橄榄石：对冷却速率的影响。月球。科学XXXV，抽象编号1246。）如此大的不确定性直接反映了扩散数据的可变性。备选地，从该可变性结果得出补偿规则，log D-0 = a + bE（扩散系数写为D = D-0 exp（-E / RT））。我们基于此规则测试了一种新的地质球度测量方法，即冷却球状晶体中的球状体Sahara-97210 LL 3.2和Wells LL 3.3。 Greeney和Ruzicka（2004年）以200-6000 K / h的冷却速率使这些球粒陨石中的Fe-Mg在橄榄石中的扩散曲线匹配。在我们的地球速度测量模型中，使用补偿规则可避免在多个扩散系数中选择一个扩散系数，从而大大降低了不确定性。我们发现，撒哈拉沙漠的冷却速度在700至3600 K / h之间，韦尔斯的冷却速度在700-1600 K / h之间。最后，我们讨论分析模型参数对冷却速率估算值的影响。

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