Dating paleochannel iron ore by (U-Th)/He analysis of supergene goethite, Hamersley province, Australia

Heim, J. A., Vasconcelos, P. M., Shuster, D. L., Farley, K. A. and Broadbent, G. (2006) Dating paleochannel iron ore by (U-Th)/He analysis of supergene goethite, Hamersley province, Australia. Geology, 34 3: 173-176. doi:10.1130/G22003.1


Author Heim, J. A.
Vasconcelos, P. M.
Shuster, D. L.
Farley, K. A.
Broadbent, G.
Title Dating paleochannel iron ore by (U-Th)/He analysis of supergene goethite, Hamersley province, Australia
Journal name Geology   Check publisher's open access policy
ISSN 0091-7613
Publication date 2006-03
Sub-type Article (original research)
DOI 10.1130/G22003.1
Volume 34
Issue 3
Start page 173
End page 176
Total pages 4
Editor J. Hammann
Place of publication United States of America
Publisher Geological Society of America
Collection year 2006
Language eng
Subject C1
260109 Geochronology
780104 Earth sciences
010103 Category Theory, K Theory, Homological Algebra
040202 Inorganic Geochemistry
040307 Ore Deposit Petrology
Abstract (U-Th)/He dating of late-stage authigenic goethite, combined with corrections for diffusive loss of He-4 by the He-4/He-3 methodology, reveals strong correlation between a sample's age and its depth in ferruginized channel sediments from the Yandicoogina deposit, Western Australia. Corrected ages, ranging from ca. 18 Ma near the surface to ca. 5 Ma at the bottom of the profile, indicate that ferruginization of the aggraded channels becomes progressively younger with depth. This trend is consistent with goethite precipitation at the groundwater-atmosphere interface during water table drawdown driven by the aridification of Western Australia during the Neogene. The results demonstrate that the (U-Th)/He system is ideal for dating goethite if diffusive loss corrections are applied. The approach is suitable for dating weathering reactions on Earth and should also be suitable for dating Fe oxyhydroxides in the Martian regolith.
Keyword Geology
(u-th)/he Dating
Goethite
Weathering Geochronology
Channel Iron Deposits
Iron Ore
Geochronology
Constraints
Deposits
Minerals
Q-Index Code C1

 
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Created: Wed, 15 Aug 2007, 10:46:52 EST