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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Rb-Sr, Sm-Nd and Ar-Ar isotopic systematics of Martian dunite Chassigny
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Rb-Sr, Sm-Nd and Ar-Ar isotopic systematics of Martian dunite Chassigny

机译：火星榴辉岩Chassigny的Rb-Sr，Sm-Nd和Ar-Ar同位素系统

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摘要

Isotopic analysis of the Martian meteorite Chassigny yields a Rb-Sr age of 1406 +/- 14 Ma with an initial Sr-87/Sr-86 ratio of 0.702251 +/- 0.000034, a Sm-Nd age of 1386 +/- 28 Ma with an initial epsilon(143Nd)-value of +16.9 +/- 0.3 and an Ar-39-Ar-40 age of 1360(+40)(-20) Ma. The concordance of these ages and the Rb-Sr and Sm-Nd initial isotopic signatures suggest that Chassigny crystallized from low Rb/Sr, light rare earth element depleted source materials similar to 1390 Ma ago. The ages and epsilon(143Nd)-values of Chassigny and the nakhlites Govenador Valadares and Lafayette overlap, suggesting that they could have come from very similar mantle sources. Nakhla, Northwest Africa 998 and Yamato 000593 appear to be from similar but distinct sources. Chassigny and all nakhlites so far studied have undergone similar evolution histories. That is, chassignitesakhlites were derived from a region where volcanism lasted at least 50 Ma and crystallized from different lava flows or subsurface sills. They probably were launched from Mars by a single impact event. The trapped Martian atmospheric Ar-40/Ar-36 ratios in Chassigny, nakhlites and shergottite impact glass are similar and possibly indicate minimal change in this ratio over the past >= 600 Ma. (c) 2006 Elsevier B.V. All rights reserved.
机译：火星陨石Chassigny的同位素分析得出Rb-Sr年龄为1406 +/- 14 Ma，初始Sr-87 / Sr-86比为0.702251 +/- 0.000034，Sm-Nd年龄为1386 +/- 28 Ma初始ε（143Nd）值为+16.9 +/- 0.3，且Ar-39-Ar-40年龄为1360（+40）（-20）Ma。这些年龄和Rb-Sr和Sm-Nd初始同位素特征的一致性表明，Chassigny从低Rb / Sr的轻稀土元素贫化原料中结晶，类似于1390 Ma以前。 Chassigny的年龄和epsilon（143Nd）值与Nakhlites Valadares和Lafayette重叠，这表明它们可能来自非常相似的地幔源。 Nakhla，西北非洲998和Yamato 000593似乎来自相似但截然不同的来源。 Chassigny和到目前为止研究的所有nakhlites经历了相似的演变历史。就是说，辉石/针石是从火山作用持续至少50 Ma的地区衍生出来的，并从不同的熔岩流或地下基岩中结晶出来。它们可能是由一次火星事件从火星发射的。 Chassigny，nakhlites和Sergottite冲击玻璃中困住的火星大气Ar-40 / Ar-36比值相似，并且可能表明过去> = 600 Ma时该比值变化很小。 （c）2006 Elsevier B.V.保留所有权利。

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