Lu-hf Age and Isotope Systematics of Alh84001
نویسندگان
چکیده
1 , T. J. Lapen 1 , A. D. Brandon 2 , B. L. Beard 3,4 , J.T. Shafer 5 , and A.H. Peslier 2,6 1 Department of Earth and Atmospheric Sciences, University of Houston, Houston TX 77204-5007, USA ([email protected]), 2 NASA-Johnson Space Center, Mail code KR, Houston TX 77058, USA, 3 Department of Geology and Geophysics, University of Wisconsin-Madison, Madison WI 53706, USA, 4 NASA Astrobiology Institute, 5 Lunar and Planetary Institute, Houston, TX 77058, 6 ESCG/JACOBS Engineering, Houston, TX 77058, USA
منابع مشابه
A younger age for ALH84001 and its geochemical link to shergottite sources in Mars.
Martian meteorite ALH84001 (ALH) is the oldest known igneous rock from Mars and has been used to constrain its early history. Lutetium-hafnium (Lu-Hf) isotope data for ALH indicate an igneous age of 4.091 +/- 0.030 billion years, nearly coeval with an interval of heavy bombardment and cessation of the martian core dynamo and magnetic field. The calculated Lu/Hf and Sm/Nd (samarium/neodymium) ra...
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A combined procedure for separating Lu, Hf, Sm, Nd, and rare earth elements (REEs) from a single sample digest is presented. The procedure consists of the following five steps: (1) sample dissolution via sodium peroxide sintering; (2) separation of the high field strength elements from the REEs and other matrix elements by a HF-free anion-exchange column procedure; (3) purification of Hf on a c...
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The Pb isotopic compositions of maskelynite and pyroxene grains were measured in ALH84001 and three enriched shergottites (Zagami, Roberts Massif 04262, and Larkman Nunatuk 12011) by secondary ion mass spectrometry. A maskelynite-pyroxene isochron for ALH84001 defines a crystallization age of 4089 ± 73Ma (2σ). The initial Pb isotopic composition of each meteorite was measured in multiple maskel...
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تاریخ انتشار 2009