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Dissecting Calathium-microbial frameworks: The significance of calathids for the Middle Ordovician reefs in the Tarim Basin, northwestern China
Li, QJ (李启剑)1; Zhang, YD (张元动)1; Li, Y (李越)1; Munnecke, A2
2017-05-15
Source PublicationPalaeogeography, Palaeoclimatology, Palaeoecology
ISSN0031-0182
Volume474Pages:66-78
Abstract

As an obconical macrofossil with porous double-wall, Calathium was commonly present in reefs of Early to early Middle Ordovician age. The Calathium-bearing reefs thrived globally during the Early Ordovician, but this ecosystem collapsed in Middle Ordovician. A rare case of Calathium-microbial reefs was found from the middle part of the Yijianfang Formation (Darriwilian, late Middle Ordovician) of the Bachu area, located in the northwestern margin of the Tarim Basin, northwestern China. Surrounded by bioclastic grainstones, patch reefs here are well-developed and vary in size, with 1-4 m in thickness and 2-18 min diameter. Three facies types are distinguished within the reef limestones: (1) Calathium-microbial framestone, (2) echinoderm-Calathium bafflestone, and (3) bryozoan-microbial bindstone. As a dominant type, the Calathium-microbial framestone shows a three-dimensional skeletal framework that is mainly constructed by Calathium and stabilized by microbialites. Although most specimens are toppled, Calathium displays well-developed lateral outgrowths, which connected individuals of the same species. Morphological characters of Calathium in thin sections show that calathids are hypercalcified sponges rather than receptaculitid algae. Unlike the Early Ordovician lithistid sponge-Calathium reefs, the Tarim reefs studied herein contain very few lithistid sponges. Instead, bryozoans are fairly common and act as the most important non-microbial encrusters, attaching to the walls of Calathium. Noticeably, the co-occurrence of pelmatozoans and Calathium is similar to those reported from Late Ordovician calathids-echinoderm reef communities from Tennessee. The presence of Calathium-microbial reefs in Tarim indicates that locally calathids were major reef builders, at least before the latest Middle Ordovician. (C) 2016 Elsevier B.V. All rights reserved.

KeywordCalathium Reef Microbialite Darriwilian Tarim Basin Northwestern China
DOI10.1016/j.palaeo.2016.08.005
Indexed BySCI
Language英语
WOS Research AreaPhysical Geography ; Geology ; Paleontology
WOS SubjectGeography, Physical ; Geosciences, Multidisciplinary ; Paleontology
WOS IDWOS:000399261500007
PublisherELSEVIER SCIENCE BV
Citation statistics
Cited Times:9[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.nigpas.ac.cn/handle/332004/13637
Collection中国科学院南京地质古生物研究所
其他
Affiliation1.Nanjing Inst Geol & Palaeontol, Key Lab Econ Stratig & Palaeogeog, Nanjing 210008, Jiangsu, Peoples R China;
2.Friedrich Alexander Univ Erlangen Nuremberg, GeoZentrum Nordbayern, D-91054 Erlangen, Germany
Recommended Citation
GB/T 7714
Li, QJ ,Zhang, YD ,Li, Y ,et al. Dissecting Calathium-microbial frameworks: The significance of calathids for the Middle Ordovician reefs in the Tarim Basin, northwestern China[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2017,474:66-78.
APA Li, QJ ,Zhang, YD ,Li, Y ,&Munnecke, A.(2017).Dissecting Calathium-microbial frameworks: The significance of calathids for the Middle Ordovician reefs in the Tarim Basin, northwestern China.Palaeogeography, Palaeoclimatology, Palaeoecology,474,66-78.
MLA Li, QJ ,et al."Dissecting Calathium-microbial frameworks: The significance of calathids for the Middle Ordovician reefs in the Tarim Basin, northwestern China".Palaeogeography, Palaeoclimatology, Palaeoecology 474(2017):66-78.
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