Guadalupian algae-sponge reefs in siliciclastic environments - the reefs at Lengwu (South China) compared with the reef at Iwaizaki (Japan)

Shen, Jian-wei and Kawamura, Toshio (2001) Guadalupian algae-sponge reefs in siliciclastic environments - the reefs at Lengwu (South China) compared with the reef at Iwaizaki (Japan). Facies, 45 1: 137-156. doi:10.1007/BF02668108


Author Shen, Jian-wei
Kawamura, Toshio
Title Guadalupian algae-sponge reefs in siliciclastic environments - the reefs at Lengwu (South China) compared with the reef at Iwaizaki (Japan)
Journal name Facies   Check publisher's open access policy
ISSN 0172-9179
Publication date 2001-01-01
Sub-type Article (original research)
DOI 10.1007/BF02668108
Volume 45
Issue 1
Start page 137
End page 156
Total pages 20
Editor E. Flugel
E. Flugel-Kahler
Place of publication Berlin, Germany
Publisher Springer
Collection year 2001
Language eng
Subject C1
260104 Sedimentology
780104 Earth sciences
Abstract Guadalupian reefs occur locally in Guangxi, Guizhou, Yunnan and Western Zhejiang, South China. Two types of Guadalupian reefs can be recognized, one is developed in carbonate platforms, e.g. those in the juncture areas of Guangxi, Yunnan and Guizhou; the other occurs in a littoral clastic shelf. The Lengwu reef in Western Zhejiang is a representative of the latter type, which is a major topic of this paper. Lengwu algae-sponge reef, more than one hundred meters in thickness, are composed mainly of sponges, hydrozoans, algae, bryozoans, microbes and lime mud. Reef limestones sit on the mudstone interbedded with fine sandstone of the proximal prodelta facies and are overlain by coarse clasts of the delta front sediments. Lengwu reef displays a lens-shaped relief, dipping and thinning from the reef core, which is remarkably different from the surrounding sediments, showing a protruding relief. Sponges and microbe/algae form bafflestone, bindstone and framestone of the reef core facies. Fore-reef facies is characterized by lithoclastic rudstone and bioclastic packstone. Reef limestone sequence is composed of three cycles and controlled by sea level changes and sediment influx. Such reef is unique among the Guadalupian reefs in South China, but seems similar in some aspects to lwaizaki reef limestones of south Kitakami in Japan. Algae and microbes growing around sponges to form rigid structure in Lengwu reef are a typical feature, which is distinctly different to Guadalupian reefs in a stable platform facies of Guizhou, Yunnan and Guangxi, South China.
Keyword Geology
Paleontology
Algae-sponge Reef
Siliciclastic Environment
Lengwu (south China)
Iwaizaki (japan)
Guadalupian
Permian Coral-reef
Rugose Corals
Archaeolithoporella
Tubiphytes
Terrane
Q-Index Code C1

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Earth Sciences Publications
 
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Created: Wed, 15 Aug 2007, 01:02:27 EST