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Hf-W thermochronometry: Closure temperature and constraints on the accretion and cooling history of the H chondrite parent body

Abstract:

We obtained Hf-W metal-silicate isochrons for several H chondrites of petrologic types 4, 5, and 6 to constrain the accretion and high-temperature thermal history of the H chondrite parent body. The silicate fractions have 180Hf/184W ratios up to ∼ 51 and 182W/184W ratios up to ∼ 33 ε units higher than the whole-rock. These high 180Hf/184W and radiogenic W isotope ratios result in highly precise Hf-W ages. The Hf-W ages of the H chondrites become younger with increasing metamorphic grade and ...

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Publication status:
Published

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Publisher copy:
10.1016/j.epsl.2008.03.013

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Journal:
EARTH AND PLANETARY SCIENCE LETTERS
Volume:
270
Issue:
1-2
Pages:
106-118
Publication date:
2008-06-15
DOI:
ISSN:
0012-821X
Source identifiers:
82806
Language:
English
Keywords:
Pubs id:
pubs:82806
UUID:
uuid:4b58c785-41b0-4b8d-8922-ad593b613111
Local pid:
pubs:82806
Deposit date:
2012-12-19

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