期刊
EARTH AND PLANETARY SCIENCE LETTERS
卷 274, 期 1-2, 页码 93-102出版社
ELSEVIER
DOI: 10.1016/j.epsl.2008.07.004
关键词
Solar System; chondrites; chondrules; Al-26; thermal metamorphism; ion microprobe
资金
- Dept. of Space, Govt. of India
Fossil records of the now-extinct short-lived nuclide Al-26 were analyzed in twelve chondrules from four unequilibrated ordinary chondrites (UOCs), Semarkona (3.0), Bishunpur and Y-791324 (both 3.1) and ALHA76004 (33), belonging to the LL group to infer their time of formation. The present data along with those reported by us previously [Rudraswami, N.G., Goswami, J.N., 2007. Al-26 in chondrules from unequilibrated L chondrites: onset and duration of chondrule formation in the early Solar System. Earth Planet. Sci. Lett. 257, 231-244] firmly establish a short duration of less than a million years for the major episode of UOC chondrule formation. Nebular processes responsible for chondrule formation started similar to 1 Ma after formation of CAIs and effectively stopped within another one and a half million years in the inner region of the asteroidal belt. Modeling of thermal evolution of chondritic parent bodies suggest that the longer duration of UOC chondrule formation inferred in some of the earlier studies could be attributed to thermal metamorphism experienced by some chondrules in UOC parent bodies. The duration of formation of UOC chondrules is significantly shorter than that for carbonaceous chondrite chondrules. (C) 2008 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据