Growth Forms of Devonian Stromatoporoids and Their Environmental Significance in South China
详细信息
- 责任者：Wu Yibu (State Key Laboratory of Biogeology and Environmental Geology ; China University of Geosciences ; Wuhan 430074 ; China) ; Gong Yiming
- 刊名：Acta Geologica Sinica
- 出版年：2013
- 卷期：87(6)
- 关键词：层孔虫类 ; stromatoporoids ; 华南地区 ; South China
- 页码：p.887-904
- 图表：illus., 3 tables, 53 refs.
- 分类号：1102
- issnNo：ISSN0001-5717
- isbnNo：CN11-1951/P
摘要
In this paper , growth forms and related parameters of stromatoporoids from four Devonian sections ( Ganxi of Sichuan , Dushan of Guizhou , Shenwan and Liujing of Guangxi ) were measured and collected in South China. Three aspects of progresses have been made as follows : ① Two kinds of density and texture bands in an annual growth band were recognized in vertical thin sections of stromatoporoids from the studied sections.They can be subdivided into seven subgroups : dark-light type ," gradual change " type ," abrupt change " type ," gradual-abrupt change " type ," growth ridge " type ," different structure " type and " single structure " type.And annual growth bands in stromatoporoids were widely developed in different taxa including 30genera and 203species in the Middle Devonian in China , and in spatiotemporal distributions.② Six types of growth interruptions were recognized in thin slices of stromatoporoids , including " sediment inclution " interrruption , commix interruption , dark growth interruption , abrupt interruption , marginal interruption.Different stromatoporoid growth forms distributed in 7 facies in South China , and 5useful growth parameters to study reef units were summarized : holistic shape , V / B , initial surface , growth rate and growth interruption.Growth forms of stromatoporoids were controlled by both periodic and episodic environmental parameters , with the former being more important.Our studies showed that the stromatoporoid was a good carrier to reconstruct palaeoenvironments and reef unit growth histories.
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