Thrombolites and ichnofossils in the Middle Cambrian of south North China Block: Implications for the environmental controls on the evolution of microbes and metazoans

2021 ◽  
Author(s):  
Min Wang ◽  
Wenfei Guo ◽  
Wentao Yang ◽  
Yong'an Qi ◽  
Mingyue Dai ◽  
...  
Keyword(s):  
North China ◽  
North China Block ◽  
Middle Cambrian ◽  
Environmental Controls

scholarly journals Diversified calcimicrobes in dendrolites of the Zhangxia Formation, Miaolingian Series (Middle Cambrian) of the North China craton

2021 ◽  
Vol 10 (1) ◽  
Author(s):  
Ming-Xiang Mei ◽  
Muhammad Riaz ◽  
Zhen-Wu Zhang ◽  
Qing-Fen Meng ◽  
Yuan Hu
Keyword(s):  
North China ◽  
Cyanobacterial Mats ◽  
Third Order ◽  
Depositional Sequence ◽  
Middle Cambrian ◽  
Forming Mechanism ◽  
The North ◽  
Biological Affinity ◽  
History Of ◽  
Group 3

AbstractAs a type of non-laminated microbial carbonates, dendrolites are dominated by isolated dendritic clusters of calcimicrobes and are distinct from stromatolites and thrombolites. The dendrolites in the upper part of the Miaolingian Zhangxia Formation at Anjiazhuang section in Feicheng city of Shandong Province, China, provide an excellent example for further understanding of both growth pattern and forming mechanism of dendrolites. These dendrolites are featured by sedimentary fabrics and composition of calcified microbes as follows. (1) The strata of massive limestones, composed of dendrolites with thickness of more than one hundred meters, intergrade with thick-bedded to massive leiolites, formimg the upper part of a third-order depositional sequence that constitutes a forced regressive systems tract. (2) A centimeter-sized bush-like fabric (shrub) typically produced by calcified microbes is similar to the mesoclot in thrombolites but distinctive from clotted fabrics of thrombolites. This bush-like fabric is actually constituted by diversified calcified microbes like the modern shrub as a result of gliding mobility of filamentous cyanobacteria. Such forms traditionally include: the Epiphyton group (which actually has uncertain biological affinity), the Hedstroemia group which closely resembles modern rivulariacean cyanobacteria, and the possible calcified cyanobacteria of the Lithocodium–Bacinella group. (3) Significantly, dense micrite of leiolite is associated with sponge fossils and burrows, and is covered by microstromatolite. The Lithocodium–Bacinella group is a controversial group of interpreted calcified cyanobacteria in the Cambrian that has also been widely observed and described in the Mesozoic. Therefore, dendrolites with symbiosis of leiolites in the studied section provide an extraordinary example for further understanding of growing style of bush-like fabrics (shrubs) of the dendrolites dominated by cyanobacterial mats. Furthermore, the present research provides some useful thinking approaches for better understanding of the history of the Early Paleozoic skeletal reefs and the microbe–metazoan transitions of the Cambrian.

Depositional environments of limestones from the Taiyuan Formation in the North China Block interpreted from REE proxies

2020 ◽  
Vol 35 (2) ◽  
Author(s):  
Dawei Lv ◽  
Wengui Fan ◽  
John I. Ejembi ◽  
Dun Wu ◽  
Dongdong Wang ◽  
...  
Keyword(s):  
North China ◽  
Depositional Environments ◽  
North China Block ◽  
The North ◽  
Taiyuan Formation

Devonian alkaline magmatic belt along the northern margin of the North China Block: Petrogenesis and tectonic implications

Lithos ◽  
2018 ◽  
Vol 302-303 ◽  
pp. 496-518 ◽  
Author(s):  
Qi-Qi Zhang ◽  
Shuan-Hong Zhang ◽  
Yue Zhao ◽  
Jian-Min Liu
Keyword(s):  
North China ◽  
North China Block ◽  
Northern Margin ◽  
The North ◽  
Tectonic Implications
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