DOI: 10.1016/j.palaeo.2016.05.034
论文题名: A new Middle Ordovician bivalve-siliceous sponge-microbe reef-building consortium from North China
作者: Lee J.-H. ; Hong J. ; Lee D.-J. ; Choh S.-J.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2016
卷: 457 起始页码: 23
结束页码: 30
语种: 英语
英文关键词: Bivalve
; Middle Ordovician
; North China Platform
; Reef
; Siliceous sponge
英文摘要: A new reef-building consortium from a Middle Ordovician succession of the western North China Platform is described, consisting mainly of bivalves, siliceous sponges, and microbial carbonates (Epiphyton-like, Renalcis-like and Girvanella calcified microbes, and microcrystalline microstromatolites), in addition to minor brachiopods, Amsassia and Rhabdotetradium. The bivalves are thin-walled and mostly articulated, indicating in situ preservation. The siliceous sponges are characterized by regularly spaced spicule networks embedded within micrite, which partly grade into peloidal textures. Three main types of bivalve-sponge associations are found: (1) larger bivalves (2-13 mm) encrusted by sponges, (2) sponges occupying internal spaces of larger bivalves, and (3) smaller (0.2-0.4 mm) bivalves embedded within sponge spicule networks. Microbial carbonates either cover the upper surfaces of siliceous sponges and bivalves, or occur independently as centimeter-scale patches. The reefal boundstones were constructed mainly by bivalves, siliceous sponges and microbes, which were subsequently encrusted and stabilized by additional sponges and microbes. Extensive early marine cementation forming fibrous cement helped stabilize the reef framework. The co-occurrence of bivalves and siliceous sponges is possibly analogous to modern-day counterparts in which sponges encrust bivalves or bivalves are living within sponges, suggesting a symbiotic relationship. The bivalve-siliceous sponge-microbial reefs of this study, together with other Ordovician reefs, represent the changeover from microbial- to skeletal-dominated reefs during the Middle Ordovician. The current example may represent an ancestral association of bivalve-siliceous sponge-microbe reefs, similar to those in the Mesozoic and Cenozoic, thus shedding light on the roots of such associations. © 2016 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/68344
Appears in Collections: 过去全球变化的重建
There are no files associated with this item.
作者单位: Department of Geology and Earth Environmental Sciences, Chungnam National University, Daejeon, South Korea; Department of Earth and Environmental Sciences, Korea University, Seoul, South Korea; Department of Earth and Environmental Sciences, Andong National University, Andong, South Korea; College of Earth Science, Jilin University, Changchun, China
Recommended Citation:
Lee J.-H.,Hong J.,Lee D.-J.,et al. A new Middle Ordovician bivalve-siliceous sponge-microbe reef-building consortium from North China[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2016-01-01,457