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. doi:10.1126/science.274.5292.1551b. https://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 | |||||||||
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| Additional Information: | © 1996 American Association for the Advancement of Science. Received 2 October 1996; accepted 1 November 1996. | |||||||||
| Issue or Number: | 5292 | |||||||||
| DOI: | 10.1126/science.274.5292.1551b | |||||||||
| Record Number: | CaltechAUTHORS:20130204-102912278 | |||||||||
| Persistent URL: | https://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: | 09 Nov 2021 23:24 |
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