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A Middle Ordovician (Darriwilian) Calathium reef complex on the carbonate ramp of the northwestern Tarim Block, northwest China: A sedimentological approach
Wang, JP (王建坡); Li, Y (李越); Zhang, YY (张园园); Kershaw, S
2017
Source PublicationPalaeogeography, Palaeoclimatology, Palaeoecology
ISSN0031-0182
Volume474Issue:SIPages:58-65
AbstractMiddle Ordovician carbonates are exposed for 25 km along the Lianglitag Mountains in the Tarim Basin, northwest China. They reflect platform carbonate and reef deposition along the ancient Central Tarim Uplift. The Darriwilian Yijianfang Formation, similar to 70 m thick, was deposited in a shallow carbonate ramp setting, deepening seaward to the north in current geography. Reefal and biostromal units are constructed primarily by sessile Calathium of possible sponge affinity in the Middle Member of the formation. Patch reefs, similar to 10 m in thickness and tens of meters in diameter, are common in the northern region. Associated shelly faunas, including trilobites, bivalves, and brachiopods, are diverse and preserved as coarse bioclastic materials together with intraclasts. Towards the south, patch reefs are smaller, <1 m in thickness and with low relief. A biostrome formed by in situ Calathium framework is interpreted to act as a baffle for fine sediments, with smaller amounts of bioclasts and intraclasts. The biostrome is only similar to 3 m thick in the southernmost section suggesting a calmer leeward setting initially. Tempestite beds composed of Calathium and nautiloid floatstones are abundant through the section, with monospecific brachiopod layers in the tempestite beds. This work demonstrates previously unrecognized paleogeographic variations of the Darriwilian Calathium reef complexes, which have larger patch reefs generally developing in the north area, smaller patch reefs dominating southward, and biostromes occurring in the southernmost locations. The reef complex was drowned due to sea-level rise, which is recorded in the upper Yijianfang Formation. (C) 2016 Elsevier B.V. All rights reserved.
KeywordMorphological variation Reef complex Yijianfang formation Bachu Northwest China
DOI10.1016/j.palaeo.2016.11.002
Indexed BySCI
Language英语
WOS Research AreaPhysical Geography ; Geology ; Paleontology
WOS SubjectGeography, Physical ; Geosciences, Multidisciplinary ; Paleontology
WOS IDWOS:000399261500006
PublisherELSEVIER SCIENCE BV
Citation statistics
Cited Times:5[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.nigpas.ac.cn/handle/332004/13636
Collection中国科学院南京地质古生物研究所
中国科学院南京地质古生物研究所
其他
Corresponding AuthorLi, Y (李越)
Recommended Citation
GB/T 7714
Wang, JP ,Li, Y ,Zhang, YY ,et al. A Middle Ordovician (Darriwilian) Calathium reef complex on the carbonate ramp of the northwestern Tarim Block, northwest China: A sedimentological approach[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2017,474(SI):58-65.
APA Wang, JP ,Li, Y ,Zhang, YY ,&Kershaw, S.(2017).A Middle Ordovician (Darriwilian) Calathium reef complex on the carbonate ramp of the northwestern Tarim Block, northwest China: A sedimentological approach.Palaeogeography, Palaeoclimatology, Palaeoecology,474(SI),58-65.
MLA Wang, JP ,et al."A Middle Ordovician (Darriwilian) Calathium reef complex on the carbonate ramp of the northwestern Tarim Block, northwest China: A sedimentological approach".Palaeogeography, Palaeoclimatology, Palaeoecology 474.SI(2017):58-65.
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