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Journal of Paleontology; September 2009; v. 83; no. 5; p. 718-738; DOI: 10.1666/08-175.1
© 2009 Paleontological Society
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ARTICLE

END-PERMIAN MASS EXTINCTION OF FORAMINIFERS IN THE NANPANJIANG BASIN, SOUTH CHINA

HAIJUN SONG1, JINNAN TONG1, Z.Q. CHEN2, HAO YANG1 and YONGBIAO WANG1

1 Key Laboratory of Biogeology and Environmental Geology of Ministry of Education, Wuhan 430074, PR China <haijun.song{at}yahoo.com.cn>, <jntong{at}cug.edu.cn>, <2003yanghao{at}163.com>, <wangyb{at}cug.edu.cn>
2 School of Earth and Environment, The University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia <zqchen{at}cyllene.uwa.edu.au>

Newly obtained foraminifer faunas from the Permian-Triassic (P-Tr) transition at the Dajiang and Bianyang sections in the Nanpanjiang Basin, South China, comprise 61 species in 40 genera. They belong to the Palaeofusulina sinensis Zone, the youngest Permian foraminifer zone in South China. Quantitative analysis reveals that the last occurrences of more than a half of species (28/54) fall into a 60-cm-interval at the uppermost Changhsingian skeletal packstone unit and thus calibrate the end-Permian extinction to the skeletal packstone-calcimicrobial framestone boundary. About 93% (54/58) of species of the latest Permian assemblage became extinct in the P-Tr crisis. Four major foraminiferal groups, the Miliolida, Fusulinida, Lagenida, and Textulariina, have extinction rates up to 100%, 96%, 92%, and 50%, respectively, and thus experienced selective extinctions. Both Hemigordius longus and ?Globivalvulina bulloides temporarily survived the end-Permian extinction event and extended into the earliest Triassic but became extinct soon after. The post-extinction foraminifer assemblage is characterized by the presence of both disaster taxa and Lazarus taxa. Foraminifer distribution near the P-Tr boundary also reveals that the irregular contact surface at the uppermost Permian may be created by a massive submarine dissolution event, which may be coeval with the end-Permian mass extinction. A new species, Rectostipulina hexamerata, is described here.

Key Words: Foraminifer • Nanpanjiang Basin • Permian • Triassic • Mass Extinction






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