Microconchids from Microbialites near the Permian-Triassic Boundary in the Zuodeng Section, Baise Area, Guangxi Zhuang Autonomous Region, South China and Their Paleoenvironmental Implications

• Published in: 地球科学学刊 no. 2; pp. 157 - 165
• Main Authors: Hao Yang, Zhong-Qiang Chen, Weiquan Ou
• Format: Journal Article
• Language: English
• Published: State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan 430074, China 2015
• Subjects: paleoenvironment; paleoecology; Permian-Triassic; microbialite; microconchids
• ISSN: 1674-487X; 1867-111X
• DOI: 10.1007/s12583-015-0522-2

Abundant microconchid worm tubes were extracted from the microbialites deposit near the Permian-Triassic boundary at the Zuodeng Section, Baise area, Guangxi Zhuang Autonomous Re-gion, South China. These calcareous worm tubes were studied in both petrographic thin sections and isolated specimens using optical microscope and sensitive electronic microscope (SEM), respectively. They are categorized into two morphological types: helically coiled and planispirally coiled tubes, which are assignable to Microconchus aberrans (Hohenstein, 1913) and M. utahesis (Zatońet al., 2013), respectively. The tube wall ultrastructure is characterized by laminated micrites, which distinguish the studied microconchids from comparable microgastropods or spirorbid polychaete that usually has shell ultrastructure of spar texture. The overwhelm majority of microconchids from the microbialite possess the planispirally coiled tubes. The lifestyle of extant, morphologically convergent spirorbids suggests that these planispirally coiled microconchids may have colonized in some local oxygenic oases probably produced by photosynthetic cyanobacteria in the oxygen-poor microbialite ecosystem in which they may have settled densely with high competition among various individuals and with other associated animals for oxygen consumption and food soucres. The deleterious environment condition of the mi-crobialite ecosystem immediately after the Permian-Triassic biocrisis is also indicated by various geo-chemical signals derived from the same section. Such a deleterious habitat may be inhospitable for most metazoans, but it has some local oxygenic oases that was favorable for opportunistic taxa to dwell.