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Anomalous Iridium Enrichment at the Triassic-Jurassic Boundary, Blomidon Formation, Fundy Basin, CanadaWe present new analyses that confirm Ir enrichment (up to 0.31 ng/g) in close proximity to the palynological Triassic-Jurassic boundary in strata near the top of the Blomidon Formation at Partridge Island, Nova Scotia. High Ir concentrations have been found in at least two samples within the uppermost 70 cm of the formation. Ratios of other PGEs and Au to Ir are generally higher by an order of magnitude than in ordinary chondrites. No impact-related materials have been identified at #is horizon in the Blomidon Formation, therefore we cannot confirm an extraterrestrial source for the anomalous Ir levels. We consider, however, the possibility that regional basaltic volcanism is a potential source for the Ir in these sediments. The elevated Ir concentrations are found in reduced, grey colored mudstones, so redox concentration is a possible explanation for the distribution of Ir in these strata.
Document ID
20070020168
Acquisition Source
Goddard Space Flight Center
Document Type
Reprint (Version printed in journal)
Authors
Kyte, Frank T.
(California Univ. Los Angeles, CA, United States)
Date Acquired
August 23, 2013
Publication Date
December 15, 2005
Publication Information
Publication: Earth and Planetary Science Letters
Volume: 240
Issue: 4-Mar
Subject Category
Geophysics
Funding Number(s)
CONTRACT_GRANT: NAG5-12895
CONTRACT_GRANT: NNA04CC10A
Distribution Limits
Public
Copyright
Other

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