Phanerozoic Microbialites often occur before and flourish after extinction events,indicating that there is a negative correlation between microbialites and metazoans,and their succession processes are closely related to major biological events.In addition,many large oil and gas fields have been discovered in the microbialites reservoirs,which has led to increasing attention paid to the study of microbialites.At present,the research of the relationship between the microbialites succession and the Great Ordovician Biodiversification Event(GOBE)has become one of the frontier hotspots of global research.This paper summarized the research progress of Ordovician microbialites in recent years,and discussed the relationship between microbialites succession and metazoan diversity,as well as the main controlling factors affecting their changes.The factors affecting the succession of Ordovician marine microbialites include intrinsic biological factors(such as bioturbation,microbial and metazoan symbiosis)and external environmental factors(such as palaeogeographic evolution,global cooling,enhanced nutrient supply from continental weathering,sea level rise,increased dissolved oxygen,and decreased carbonate saturation).The existing problems in the study of Ordovician marine microbialites are analyzed,and pointed out that micro-factors such as microbial community types and fabric evolution that affect the development of marine microbialites may be the focus of future research.Meanwhile,the different manifestations of the interaction between microbialites succession and metazoan radiation,and even the interaction with the four spheres of the Earth(biosphere,lithosphere,hydrosphere,and atmosphere)on different continents,more interdisciplinary research may be needed,which is of great significance for studying the main controlling factors of marine facies microbialites succession and the paleo-environment and paleoclimate during their formation.
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