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Response: Late Permian Extinctions

Knoll, Andrew H. and Bambach, Richard K. and Canfield, Donald and Grotzinger, John P. (1996) Response: Late Permian Extinctions. Science, 274 (5292). pp. 1551-1552. ISSN 0036-8075. http://resolver.caltech.edu/CaltechAUTHORS:20130204-102912278

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Abstract

We agree with Caldeira that the mechanism we proposed (1) to account for large decreases in the C isotopic composition of surface sea water during Neoproterozoic and Permo-Triassic can work only if the negative excursions lasted for less than 10^6 years. It is likely that the Permo-Triassic boundary excursion persisted no longer than the 10^5-year time scale permitted in Kump's model (2). At the proposed Permo- Triassic boundary stratotype at Meishan, China, the stratigraphic interval containing the excursion is 1 meter thick (3); an earlier negative excursion described by Jin (4) from a Capitanian-Wujiapingian boundary section in southwestern China is confined to a comparably thin stratigraphic interval. For the one Neoproterozoic negative excursion closely constrained by radiometric data, uranium-lead zircon dates on volcanic rocks just below and just above the event are the same to within the measurement error of one million years (5).


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1126/science.274.5292.1551bDOIArticle
http://www.sciencemag.org/content/274/5292/1551.2PublisherArticle
ORCID:
AuthorORCID
Grotzinger, John P.0000-0001-9324-1257
Additional Information:© 1996 American Association for the Advancement of Science. Received 2 October 1996; accepted 1 November 1996.
Record Number:CaltechAUTHORS:20130204-102912278
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20130204-102912278
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:36753
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:05 Feb 2013 23:24
Last Modified:26 Oct 2017 19:11

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