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Iridium enrichment in volcanic dust from blue ice fields, Antarctica, and possible relevance to the K/T boundary eventThe analysis of samples of volcanic ash dust layers from the Lewis Cliff/Beardmore Glacier in Antarctica shows that some of the samples contain Ir concentrations up to 7.5 ppb. It is shown that the Ir is positively correlated with Se, As, Sb, and other volcanogenic elements. The results show that Ir may be present in some volcanic ash deposits, suggesting that the Ir in the K/T boundary clays is not necessarily of cosmic origin, but may have originated from mantle reservoirs tapped during extensive volcanic eruptions possibly triggered by impact events.
Document ID
19890052867
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Koeberl, Christian
(Lunar and Planetary Institute Houston, TX, United States)
Date Acquired
August 14, 2013
Publication Date
April 1, 1989
Publication Information
Publication: Earth and Planetary Science Letters
Volume: 92
Issue: 3-4
ISSN: 0012-821X
Subject Category
Geophysics
Report/Patent Number
ISSN: 0012-821X
Accession Number
89A40238
Funding Number(s)
CONTRACT_GRANT: NASW-4066
CONTRACT_GRANT: NSF DPP-83-14496
Distribution Limits
Public
Copyright
Other

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