کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6438967 | 1638037 | 2013 | 16 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Magnesium isotopic composition of the Moon
ترجمه فارسی عنوان
ترکیبات ایزوتوپی منیزیم ماه
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موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
ژئوشیمی و پترولوژی
چکیده انگلیسی
The Mg isotopic compositions of 47 well-characterized lunar samples, including mare basalts, highland rocks, regolith breccias, and mare and highland soils were measured to address the behavior of Mg isotopes during lunar magmatic differentiation, constrain the Mg isotopic composition of the Moon, and evaluate the degree of Mg isotopic fractionation between planetary bodies. The δ26Mg values range from â0.61 ± 0.03â° to 0.02 ± 0.06â° in 22 mare basalts, from â0.34 ± 0.04â° to â0.18 ± 0.06â° in 3 highland rocks, from â0.33 ± 0.05â° to â0.14 ± 0.08â° in 7 regolith breccias, from â0.23 ± 0.05â° to â0.14 ± 0.07â° in 6 highland soils, and from â0.41 ± 0.05â° to â0.20 ± 0.09â° in 9 mare soils. The limited Mg isotopic variation among bulk mare and highland soils and regolith breccias indicates negligible Mg isotope fractionation by lunar surface processes. By contrast, the large Mg isotopic fractionation between low-Ti and high-Ti basalts suggests the source heterogeneity produced during fractional crystallization of the lunar magma ocean, with ilmenite having lighter Mg isotopic compositions than olivine and pyroxene. Overall, the Moon has a weighted average Mg isotopic composition (δ26Mg = â0.26 ± 0.16â°) indistinguishable from the Earth (δ26Mg = â0.25 ± 0.07â°) and chondrites (δ26Mg = â0.28 ± 0.06â°), suggesting homogeneous Mg isotopic distribution in the solar system and the lack of Mg isotope fractionation during the Moon-forming giant impact.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Geochimica et Cosmochimica Acta - Volume 120, 1 November 2013, Pages 1-16
Journal: Geochimica et Cosmochimica Acta - Volume 120, 1 November 2013, Pages 1-16
نویسندگان
Fatemeh Sedaghatpour, Fang-Zhen Teng, Yang Liu, Derek W.G. Sears, Lawrence A. Taylor,