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Diffusion of Siderophile Elements in Fe Metal: Application to Zoned Metal Grains in ChondritesThe distribution of highly siderophile elements (HSE) in planetary materials is controlled mainly by metal. Diffusion processes can control the distribution or re-distribution of these elements within metals, yet there is little systematic or appropriate diffusion data that can be used to interpret HSE concentrations in such metals. Because our understanding of isotope chronometry, redox processes, kamacite/taenite-based cooling rates, and metal grain zoning would be enhanced with diffusion data, we have measured diffusion coefficients for Ni, Co, Ga, Ge, Ru, Pd, Ir and Au in Fe metal from 1200 to 1400 C and 1 bar and 10 kbar. These new data on refractory and volatile siderophile elements are used to evaluate the role of diffusional processes in controlling zoning patterns in metal-rich chondrites.
Document ID
20030111484
Document Type
Conference Paper
Authors
Righter, K. (NASA Johnson Space Center Houston, TX, United States)
Campbell, A. J. (Chicago Univ. Chicago, IL, United States)
Humajun, M. (Chicago Univ. Chicago, IL, United States)
Date Acquired
August 21, 2013
Publication Date
January 1, 2003
Publication Information
Publication: Lunar and Planetary Science XXXIV
Subject Category
Lunar and Planetary Science and Exploration
Report/Patent Number
JSC-CN-7729
Funding Number(s)
CONTRACT_GRANT: NAG5-9435
CONTRACT_GRANT: NAG5-9800
Distribution Limits
Public
Copyright
Public Use Permitted.

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