Late Ordovician microbial reefs in the Lianglitag Formation (Bachu, Tarim, NW China)

Zhang, Yuanyuan; Li, Yue; Munnecke, Axel

doi:10.1007/s10347-014-0396-2

Cited by 21 publications

(9 citation statements)

References 23 publications

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“…Metazoan fragments include bryozoans (rare), molluscs (common) and echinoderms (rare) (Zhang et al . ). The main reef core on the western side is mound‐shaped with an exposed diameter about 200 m and maximum thickness of about 35 m, which makes it the thickest reef in the study area.…”

Section: Methodsmentioning

confidence: 97%

“…and Panderodus gracilis indicate the Katian Belodina confluens Biozone ). Li et al (2009) and Zhang et al (2014) suggested that there are three microbial-calcareous algal reefbuilding episodes in the Lianglitag Formation. The 'Middle Red Limestone' forms a continuous outcrop along the Lianglitag Mountains and can be easily recognized.…”

Section: Geological Background and Stratigraphymentioning

confidence: 99%

“…Microbial elements are Renalcis (common) and Girvanella (rare); calcareous algae include Vermiporella (abundant), Halysis (common) and Subtifloria (rare). Metazoan fragments include bryozoans (rare), molluscs (common) and echinoderms (rare) (Zhang et al 2014). The main reef core on the western side is mound-shaped with an exposed diameter about 200 m and maximum thickness of about 35 m, which makes it the thickest reef in the study area.…”

Section: Microwave Station Sectionmentioning

confidence: 99%

“…The biological components of these reef-building episodes are essentially dominated by microbial taxa (e.g. Zhang et al 2014). The second episode, called 'Middle Red Limestone' by Chinese geologists, exhibits a reef complex composed of patch reefs on the northern, seaward side and coeval shallow intra-and/or bioclastic banks on the southern, landward side palaeogeographically.…”

mentioning

confidence: 99%

“…B, The northern extension of the main reef core is tectonically deformed, and its top has been eroded. Samples for the biotic and lithological analysis of the patch reef(Zhang et al 2014) have been collected from the other side of this block. The lens above the (b) possibly represents a bank facies intercalated in the main reef core.…”

mentioning

confidence: 99%

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Ramp morphology controlling the facies differentiation of a Late Ordovician reef complex at Bachu, Tarim Block, NW China

Zhang

Wang

Munnecke

et al. 2015

LET

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A carbonate ramp in the shallow-marine northwestern part of the Central Tarim Uplift, Bachu, NW China, exhibits an extraordinary Late Ordovician reef complex along the Lianglitag Mountains, exposed for a distance of about 25 km. Seven localities within the 'Middle Red Limestone' of the Upper Member of the Lianglitag Formation (Katian, Late Ordovician) illustrated the changes in biofacies and lithofacies: northern, seaward-directed patch reefs are replaced towards the south by coeval grain banks. The patch reef units are dominated by microbial and calcareous algal components. The reefs at the northernmost locality are knoll-shaped, kalyptra-shaped or irregularly shaped with sizes of individual reefs increasing from about 2 m in height and diameter. Stratigraphically upward, reefs notably expand to larger structures by several mounds coalescing; they are generally about 10 m thick and tens of metres in lateral extent. The maximum thickness of the main patch reef is more than 30 m, and its diameter is around 100 m. The reefal units turn into biostromes with gentler relief southward and still further south grade into banks composed of peloids and coated grains. The southernmost locality is still a shallow-water bank, and the coastline is not documented in the study area. The present evidence indicates that the Late Ordovician palaeo-oceanography provided a number of environments for the optimal growth of carbonate build-ups; microbial-calcareous algal communities could thrive in areas where the innovative metazoan reef frameworks consisting of corals and stromatoporoids did not play a significant role. The ramp morphology, especially changes in water depth, controlled the configuration of the reef complex. □ Bachu, Late Ordovician, Lianglitag Formation, NW China, reef complex, Tarim Block.Yuanyuan Zhang [yuanyuanzh85@163.com], and Yue Li [yueli@nigpas.ac.cn], Nanjing

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Section: Methodsmentioning

confidence: 97%

Section: Geological Background and Stratigraphymentioning

confidence: 99%

Section: Microwave Station Sectionmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Ramp morphology controlling the facies differentiation of a Late Ordovician reef complex at Bachu, Tarim Block, NW China

Zhang

Wang

Munnecke

et al. 2015

LET

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Algae, calcitarchs and the Late Ordovician Baltic limestone facies of the Baltic Basin

Kröger

Penny

Shen

et al. 2019

Facies

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The Late Ordovician succession of the Baltic Basin contains a characteristic fine-grained limestone, which is rich in calcareous green algae. This limestone occurs in surface outcrops and drill-cores in an extensive belt reaching from Sweden across the Baltic Sea to the Baltic countries. This limestone, which is known in the literature under several different lithological names, is described and interpreted, and the term "Baltic limestone facies" is suggested. The microfacies, from selected outcrops from the Åland Islands, Finland and Estonia, consists of calcareous green algae as the main skeletal component in a bioclastic mudstone-packstone lithology with a pure micritic matrix. Three types of calcitarch, which range in diameter from c. 100-180 μm, are common. Basinward, the youngest sections of the facies belt contain coral-stromatoporoid patch reefs and Palaeoporella-algal mounds. The Baltic limestone facies can be interpreted as representing the shallow part of an open-marine low-latitude carbonate platform.

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Reef-building red algae from an uppermost Permian reef complex as a fossil analogue of modern coralline algal ridges

Chen

Wang

Huang

et al. 2020

Facies

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Late Ordovician microbial reefs in the Lianglitag Formation (Bachu, Tarim, NW China)

Cited by 21 publications

References 23 publications

Ramp morphology controlling the facies differentiation of a Late Ordovician reef complex at Bachu, Tarim Block, NW China

Ramp morphology controlling the facies differentiation of a Late Ordovician reef complex at Bachu, Tarim Block, NW China

Algae, calcitarchs and the Late Ordovician Baltic limestone facies of the Baltic Basin

Reef-building red algae from an uppermost Permian reef complex as a fossil analogue of modern coralline algal ridges

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