146Sm-142Nd systematics measured in enstatite chondrites reveals a heterogeneous distribution of 142Nd in the solar nebula
نویسندگان
چکیده
منابع مشابه
Chondrite barium, neodymium, and samarium isotopic heterogeneity and early Earth differentiation.
Isotopic variability in barium, neodymium, and samarium in carbonaceous chondrites reflects the distinct stellar nucleosynthetic contributions to the early solar system. We used 148Nd/144Nd to correct for the observed s-process deficiency, which produced a chondrite 146Sm-142Nd isochron consistent with previous estimates of the initial solar system abundance of 146Sm and a 142Nd/144Nd at averag...
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Introduction: The origin of short-lived nuclides in the solar nebula is a long standing controversial issue. There are two major explanations: injection from neighboring supernovae or AGB stars [1-3], or in situ irradiation of nebular dust and gas by solar energetic particles (SEP) [4-7]. The distribution of short-lived nuclides in the solar nebula is a key test of these models. Unlike
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15 صفحه اولCoupled 182W-142Nd constraint for early Earth differentiation.
Recent high precision (142)Nd isotope measurements showed that global silicate differentiation may have occurred as early as 30-75 Myr after the Solar System formation [Bennett V, et al. (2007) Science 318:1907-1910]. This time scale is almost contemporaneous with Earth's core formation at approximately 30 Myr [Yin Q, et al. (2002) Nature 418:949-952]. The (182)Hf-(182)W system provides a power...
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ژورنال
عنوان ژورنال: Proceedings of the National Academy of Sciences
سال: 2011
ISSN: 0027-8424,1091-6490
DOI: 10.1073/pnas.1017332108