Abstract Stromatolites of the Luanshigou Formation of Mesoproterozoic Shennongjia Group were developed very well in the northern margin of Yangtze Craton. Their types are abundant. The forms of the stromatolites include colonnella,domal,stratiform,conophyton,strati-columnar,cabbage-like stromatolites and stromatolite bioherm. They are mainly small-medium sized,with some of them large- or huge-sized. Most of them have no walls, and some of them have a single wall. Their symmetry and inheritance are mainly good. The study shows that the morphology and size of stromatolites are closely related to the corresponding hydrodynamic conditions,water depth and the content of terrestrial components. Stratiform stromatolites grew up primarily in the intertidal;columnar stromatolites were found in the intertidal and the subtidal environment. Domal stromatolites were formed in the intertidal zone and the subtidal zone. Conophyton stromatolites were often seen in the subtidal zone and the intertidal zone. Strati-columnar and cone-columnar stromatolites were developed dominantly in the intertidal zone. Stromatolites bioherm were located in the intertidal zone and the subtidal zone. The combinations of macro and micro characteristics of different types of stromatolites, the vertical supperpositions of different stromatolites, the relationship between their sedimentary structure and their corresponding facies, as well as the carbon and oxygen isotopes, all infer that the formation of stromatolites was mainly influenced by the content of microbacteria and sedimentary environment. Biological factors affected the microscopic constitution of stromatolites;hydrodynamic condition controlled the types of stromatolites,and the water depth affected their size. The environment with biological prosperity and less terrigenous materials was favorable for the development of stromatolites.
Fund:Co-funded by the National Key Research and Development Program of China(No.2016YFC0601001),the National Natural Science Foundation of China(No.41472082),the China Geological Survey Projects(No. DD20160120-01)and the Project of Shennongjia Global Geopark
Corresponding Authors:
Kuang Hong-Wei,born in 1969,is a professor in the Institute of Geology,CAGS. She is mainly engaged in sedimentology,stratigraphy and petroleum geology. E-mail: kuanghw@126.com. Peng Nan,born in 1983,is a research assistant in the Institute of Geology,CAGS. He is mainly engaged in sedimentary geology and palaeogeography. E-mail: pengnan19830120@126.com.
About author: Fan Zheng-Xiu,born in 1990,is a Ms. Degree candidate in the Institute of Geology,CAGS. She is engaged in paleontology and stratigraphy. E-mail: fanzx1990fyx@126.com.
Cite this article:
Fan Zheng-Xiu,Kuang Hong-Wei,Liu Yong-Qing et al. Types of stromatolites of the Mesoproterozoic Shennongjia Group in northern margin of Yangtze Craton and their sedimentary significance[J]. JOPC, 2018, 20(4): 545-561.
Fan Zheng-Xiu,Kuang Hong-Wei,Liu Yong-Qing et al. Types of stromatolites of the Mesoproterozoic Shennongjia Group in northern margin of Yangtze Craton and their sedimentary significance[J]. JOPC, 2018, 20(4): 545-561.
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