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2015 GSA Annual Meeting in Baltimore, Maryland, USA (1-4 November 2015)

Paper No. 278-3
Presentation Time: 8:30 AM

BIOTIC AND OCEAN-REDOX CHANGES DURING THE EARLY-MIDDLE TRIASSIC


SAITO, Ryosuke1, KAIHO, Kunio1, OBA, Masahiro1, TAKAHASHI, Satoshi2, CHEN, Zhong Qiang3, TIAN, Li4, CHEN, Jing5 and TONG, Jinnan6, (1)Geology, Tohoku University, Sendai, 980-8578, Japan, (2)Earth and Planetary Science, University of Tokyo, Science Building no.1 room 852, Hongo 7-3-1, Tokyo, 113-0033, Japan, (3)State Key Laboratory GPMR, China University of Geosciences, Lumo Road 388, Wuhan, 430074, China, (4)State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences (Wuhan), Wuhan, Lumo Road, No 388, Wuhan, 430074, China, (5)Yifu Museum, China University of Geosciences, No. 388 Lumo Road, Wuhan, 430074, China, (6)State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, No. 388 Lumo Road, Wuhan, 430074, China, olivinline@yahoo.co.jp

The most severe mass extinction in Earth’s history occurred at 251.9 Ma. Even after the end-Permian mass extinction interval, devastated environments seemed to persist. Rather than coming to an end, conditions harsh for life persisted for 5 million years after the extinction into the Early Triassic. The aim of this study is to describe the types of changes in biological and environmental oscillations that occurred from the earliest to the early Middle Triassic and to elucidate causes for the delayed biotic recovery from the end-Permian mass extinction using methods of organic geochemistry. We describe the results of organic analyses and clarify changes in biotic and ocean-redox conditions in the latest Permian–early Middle Triassic based on the stratigraphic sequences from South China. We reveal changes in redox conditions, the role of bacteria and eukaryotes in climatic changes, and the degree to which cyanobacteria and eukaryotic algae proliferation and decline. These observations provide a good example of the types of processes that terrestrial and marine environments undergo before biotic recovery from a mass extinction is complete.

Session No. 278

T150. Early and Middle Triassic Restructuring Following the End-Permian Mass Extinction
Wednesday, 4 November 2015: 8:00 AM-12:00 PM
Room 316 (Baltimore Convention Center)
Geological Society of America Abstracts with Programs. Vol. 47, No. 7, p.699
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