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Thrombolite reefs with archaeocyaths from the Xiannudong Formation (Cambrian Series 2), Sichuan, China: implications for early Paleozoic bioconstruction

Authors
Zhang, MeiqiHong, JongsunChoh, Suk-JooLee, Dong-Jin
Issue Date
10월-2017
Publisher
GEOLOGICAL SOCIETY KOREA
Keywords
thrombolite; Girvanella; archaeocyath; sponge; reef
Citation
GEOSCIENCES JOURNAL, v.21, no.5, pp.655 - 666
Indexed
SCIE
SCOPUS
KCI
Journal Title
GEOSCIENCES JOURNAL
Volume
21
Number
5
Start Page
655
End Page
666
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/81958
DOI
10.1007/s12303-017-0011-y
ISSN
1226-4806
Abstract
The early Cambrian incorporation of organisms with calcareous skeletons into microbial reefs initiated the metazoan bioconstructions of the Phanerozoic. Microbial reefs containing archaeocyaths from the middle early Cambrian Xiannudong Formation of the South China Block are investigated. The Xiannudong thrombolitic frameworks are composed primarily of Girvanella clumps and crusts, micritic clumps, and subordinate Epiphyton bundles. Amalgamated microbial frameworks contain sparse and rare (<5%) archaeocyaths, with irregular archaeocyaths dominating the regular archaeocyaths by 6: 1, and enclosed by Girvanella and other microbial elements. These Xiannudong thrombolitic reefs are broadly similar to other lower Cambrian thrombolitic reefs containing archaeocyaths, developed around shoals and lagoons. Similar thrombolitic reefs of the middle Cambrian from the Sino-Korean Block and Australia show reduced and increased contributions of Girvanella and Epiphyton, respectively, and the incorporation of lithistid and heteractinide sponges instead of archaeocyaths. These data suggest that the late early Cambrian decline of the archaeocyaths and their nearly instantaneous replacement by other metazoans allowed the continuance of microbial reefs with rare metazoans until the late Middle Ordovician shift in reef construction to metazoan reefs.
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Choh, Suk Joo
이과대학 (지구환경과학과)
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