A new chronology for the end-Triassic mass extinction

Details A new chronology for the end-Triassic mass extinction A new chronology for the end-Triassic mass extinction

Mar 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010e%26psl.291..113d&link_type=abstract

Earth and Planetary Science Letters, Volume 291, Issue 1-4, p. 113-125.

Mathematics

Logic

10

Scientific paper

The transition from the Triassic to Jurassic Period, initiating the ‘Age of the dinosaurs’, approximately 200 Ma, is marked by a profound mass extinction with more than 50% genus loss in both marine and continental realms. This event closely coincides with a period of extensive volcanism in the Central Atlantic Magmatic Province (CAMP) associated with the initial break-up of Pangaea but a causal relationship is still debated. The Triassic-Jurassic (T-J) boundary is recently proposed in the marine record at the first occurrence datum of Jurassic ammonites, post-dating the extinction interval that concurs with two distinct perturbations in the carbon isotope record. The continental record shows a major palynological turnover together with a prominent change in tetrapod taxa, but a direct link to the marine events is still equivocal. Here we develop an accurate chronostratigraphic framework for the T-J boundary interval and establish detailed trans-Atlantic and marine-continental correlations by integrating astrochronology, paleomagnetism, basalt geochemistry and geobiology. We show that the oldest CAMP basalts are diachronous by 20 kyr across the Atlantic Ocean, and that these two volcanic pulses coincide with the end-Triassic extinction interval in the marine realm. Our results support the hypotheses of Phanerozoic mass extinctions resulting from emplacement of Large Igneous Provinces (LIPs) and provide crucial time constraints for numerical modelling of Triassic-Jurassic climate change and global carbon-cycle perturbations.

Affiliated with

Also associated with

No associations

Rating

A new chronology for the end-Triassic mass extinction does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with A new chronology for the end-Triassic mass extinction, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and A new chronology for the end-Triassic mass extinction will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-879937