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

作　　者：Hao Yang Zhong-Qiang Chen Weiquan Ou 

机构地区：[1]State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences

出　　处：《Journal of Earth Science》2015年第2期157-165,共9页地球科学学刊（英文版）

基　　金：supported by the 973 Program (No. 2011CB808800);the China 111 Program (No. B08030);the National Natural Science Fundation of China (Nos. 41002003,41272023, 41172036);a research grant from the State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences (No. GBL11206)

摘　　要：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 （Zatofi et al., 2013）, respectively. The tube wall ultrastructnre is characterized by laminated micrites, which distinguish the studied microconchids from comparable microgastropods or spirorbid polychaete that usually has shell nltrastructnre 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 geochemical 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.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 （Zatofi et al., 2013）, respectively. The tube wall ultrastructnre is characterized by laminated micrites, which distinguish the studied microconchids from comparable microgastropods or spirorbid polychaete that usually has shell nltrastructnre 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 geochemical 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.

关 键 词：PERMIAN-TRIASSIC MICROBIALITE microconchids PALEOECOLOGY paleoenvironment. 

分 类 号：P588.248[天文地球—岩石学] X820.3[天文地球—地质学]