Sm–Nd and Rb–Sr studies of lherzolitic shergottite Yamato 984028
Sm–Nd and Rb–Sr studies of lherzolitic shergottite Yamato 984028
复制标题
二辉橄榄石六角辉石 Yamato 984028 的 Sm-Nd 和 Rb-Sr 研究
DOI：
10.1016/j.polar.2010.05.004
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发表时间：
2011
期刊：
影响因子：
1.8
通讯作者：
K. Misawa
中科院分区：
文献类型：
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作者：
C. Shih;L. Nyquist;Y. Reese;K. Misawa
Yamato 984028（Y 984028）的微量元素Rb、Sr、Nd和Sm的分布模式与其二辉橄榄质辉绿闪长岩的分类相一致。该二辉橄榄质辉橄榄岩的Sm-Nd矿物等时线年龄为170 ± 10 Ma，初始Nd= +11.6 ± 0.2。相应的Rb-Sr矿物等时线年龄为170 ± 9 Ma，初始87 Sr/86 Sr = 0.710389 ± 0.000029。Sm-Nd和Rb-Sr等时线年龄一致表明，Y 984028与其他5个二辉橄榄质shergotite和10个富集的玄武质和橄榄斑状shergotite形成于170 ± 7 Ma前。年龄、Sr和Nd同位素特征进一步表明，Y 984028和Y-793605，以及Y 000097可能来自同一岩浆体。采用两阶段演化模型，Y 984028母岩浆地幔源区的时间平均~（87）Rb/~（86）Sr比值为0.182，处于其它二辉橄榄质辉橄榄岩的0.178-0.182范围内。其母岩浆源地幔的时间平均147 Sm/144 Nd比值为超镁铁质，为0.217，表明其源区为类似于西北非洲（NWA）1460的亏损镁铁质部分。Y 984028中的Rb、Sr、Sm和Nd分布可能是由辉石和橄榄石堆积产生的，可能来自于侵入岩浆体中类似NWA 1460的母体熔体。
The distribution pattern of the trace elements Rb, Sr, Nd and Sm for Yamato 984028 (Y984028) is consistent with its classification as a lherzolitic shergottite. The Sm–Nd mineral isochron of this lherzolitic shergottite defines its age to be 170 ± 10 Ma for an initial ɛNd= +11.6 ± 0.2. The corresponding Rb–Sr mineral isochron yields an identical age of 170 ± 9 Ma and an initial87Sr/86Sr = 0.710389 ± 0.000029. The concordant Sm–Nd and Rb–Sr isochron ages suggest that Y984028 crystallized 170 ± 7 Ma ago contemporaneously with five other lherzolitic shergottites and ten enriched basaltic and olivine-phyric shergottites. The age, Sr- and Nd- isotopic signatures further suggest that Y984028 and Y-793605, and also probably Y000097 could come from a single magmatic body. Using a two-stage evolution model, the time-averaged87Rb/86Sr-ratio for the mantle source of the parent magma of Y984028 is ∼0.182, within the range of 0.178–0.182 that has been reported for other lherzolitic shergottites. The corresponding time-averaged147Sm/144Nd-ratio for the source mantle of its parent magma is super-chondritic at ∼0.217, implying its source was a depleted mafic part of the Martian mantle similar to that of diabasic shergottite Northwest Africa (NWA) 1460. Rb, Sr, Sm and Nd distributions in Y984028 are likely produced by pyroxene and olivine accumulation, probably from a NWA 1460-like parental melt, in an intrusive magma body.
二辉橄榄岩Yamato 000097的化学特征及从其化学成分推断火星上的岩浆活动
DOI：
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发表时间：
2009
期刊：
Polar.Sci. 3
影响因子：
--
作者：
N.Shirai;M.Ebihra
通讯作者：
M.Ebihra
RBT04262 的岩石学和矿物学：对二辉橄榄岩辉角岩火成岩块地层学的意义
DOI：
--
发表时间：
2008
期刊：
Lunar and Planetary Science XXXIX
影响因子：
--
作者：
Mikouchi T.;et. al.
通讯作者：
et. al.