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K/T age for the popigai impact eventThe multi-ringed POPIGAI structure, with an outer ring diameter of over 100 km, is the largest impact feature currently recognized on Earth with an Phanerozoic age. The target rocks in this relatively unglaciated region consist of upper Proterozoic through Mesozoic platform sediments and igneous rocks overlying Precambrian crystalline basement. The reported absolute age of the Popigai impact event ranges from 30.5 to 39 Ma. With the intent of refining this age estimate, a melt-breccia (suevite) sample from the inner regions of the Popigai structure was prepared for total fusion and step-wise heating Ar-40/Ar-39 analysis. Although the total fusion and step-heating experiments suggest some degree of age heterogeneity, the recurring theme is an age of around 64 to 66 Ma.
Document ID
Document Type
Conference Paper
Deino, A. L. (California Univ. Berkeley., United States)
Garvin, J. B. (NASA Goddard Space Flight Center Greenbelt, MD., United States)
Montanari, S. (California Univ. Berkeley., United States)
Date Acquired
September 6, 2013
Publication Date
January 1, 1991
Publication Information
Publication: Lunar and Planetary Inst., 22nd Lunar and Planetary Science Conference
Subject Category
Distribution Limits
Work of the US Gov. Public Use Permitted.

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IDRelationTitle19910010682Analytic PrimaryTwenty-Second Lunar and Planetary Science Conference