Titanium isotopes and the radial heterogeneity of the solar system
Titanium isotopes and the radial heterogeneity of the solar system
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DOI：
10.1016/j.epsl.2007.10.017
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发表时间：
2008-02-20
影响因子：
5.3
通讯作者：
Halliday, Alex N.
中科院分区：
文献类型：
--
作者：
Leya, Ingo;Schoenbaechler, Maria;Halliday, Alex N.
太阳系被认为是统一的大规模的难熔元素的同位素组成。在这里，我们表明，钛（Ti）同位素组成的碳质辉长岩不同于普通辉长岩，eucrites，mesosiderites，reulilites，地球，月球和火星，所有这些都是难以区分的。沥滤液和矿物分离物表明，这一特征均匀分布在碳质碳酸盐阿连德和Renazzo的一系列相内。因此，这些数据表明，太阳星云中的小行星体的Ti（和Sr、Ba、Nd、Sm）同位素是均匀的，这些小行星体的质量介于1 Au和2.4 Au之间，例如地球、月球、火星和普通的钙钛矿、eucrite、ureilites和mesosidite的母体。相比之下，碳质辉长岩，可能形成超过类似的2.7 Au似乎已经获得了原始成分的独特组合，这是一致的，他们缺乏消耗的挥发性元素和后期形成。(c)2007 Elsevier B.V保留所有权利。
The solar system is assumed to be uniform on a large scale in terms of the isotope composition of refractory elements. Here we show that the titanium (Ti) isotope compositions of carbonaceous chondrites differ from those of ordinary chondrites, eucrites, mesosiderites, ureilites, the Earth, Moon, and Mars, all of which are indistinguishable. Leachates and mineral separates demonstrate that this feature is homogeneously distributed within a range of phases in the carbonaceous chondrites Allende and Renazzo. The data therefore indicate that the solar nebula that fed planetesimals between similar to 1 AU and similar to 2.4 AU, e.g. Earth, Moon, Mars and the parent bodies of ordinary chondrites, eucrites, ureilites, and mesosiderites, was homogeneous for Ti (and Sr, Ba, Nd, Sm) isotopes. In contrast, carbonaceous chondrites, which probably formed beyond similar to 2.7 AU appear to have acquired a distinct mix of primitive components, which is consistent with their lack of depletion in volatile elements and late formation. (c) 2007 Elsevier B.V All rights reserved.