Calcimicrolith types and paleoenvironment evolution of the Sinian Dengying Formation in northern margin of Huangling Uplift,Three Gorges of Hubei Province
FAN Chengmeng1, YANG Hailin1, YANG Yang2, WEN Hanjie2, FAN Haifeng2, ZHANG Hongjie2, LI Fanghui3, XIAO Jiaolong3, ZHOU Yu4
1 College of Land Resources and Engineering,Kunming University of Science and Technology,Kuming 650093,China; 2 State Key Laboratory of Ore Deposit Geochemistry,Institute of Geochemistry,Chinese Academy of Sciences,Guiyang 550081,China; 3 The Seventh Geological Brigade of Hubei Provincial Geological Bureau,Hubei Yichang 443100,China; 4 Kunming University,Kunming 650214, China
Abstract：The Sinian Dengying Formation at the northern margin of the Huangling Uplift not only records the co-evolution of the environment and life during the late Sinian,but also contains a large number of calcimicroliths,which serve as important indicators for studying the paleoenvironment of the Neoproterozoic-Paleozoic transition. In this paper,based on the detailed field investigation and indoor lithofacies analysis and interpretation of the Sinian Dengying Formation along the northern margin of Huangling Uplift,nine types of sedimentary microfacies are identified,including dolomitic microbialite,dolomitic microlithite and dolomitic microallolite,with dolomitic microbialite being the most dominant type. Based on the analysis of calcimicrolith lithology types and their combinatory relationships,it is proposed that a variety of subtidal-intertidal-supertidal stratigraphic sequences have developed,characterized by upward stacking and meter-scale stratigraphic cycles composed of multiple grain beaches and microbial mounds. On this basis,four transgression-regression secondary cycles are described in detail. A shallow water carbonate platform model,exhibiting typical lithofacies characteristics of tidal flat facies,mound beach bodies,and grain beaches during the late Sinian period at the northern margin of the Huangling Uplift,has been established. This carbonate sedimentary model is similar to that of modern microbial carbonate,with a notable characteristic being that the thrombolites are formed in a low-energy subtidal environment,situated below the normal wave base and deeper than dolomitic laminated stone and dolomitic stromatolites. Based on the lithofacies characteristics,lithofacies assemblage,and the evolution of sedimentary facies of calcimicrolith,it is inferred that the palaeoenvironmental evolution in this area is primarily influenced by secondary fluctuations in sea level. The development of calcimicrolith in the Sinian Dengying Formation,located at the northern margin of the Huangling uplift,may respond to the increased oxygen content and the formation of marine rocks abundant in microorganisms following the Neoproterozoic oxidation event. Additionally,it may be closely associated with the emergence of the Shibantan biota and the decrease of microbial content due to the evolution of metazoans. Analyzing the types of calcimicrolith development in the Sinian Dengying Formation at the northern margin of Huangling uplift not only constrains global sea-level changes and the evolution of paleo-ocean environment during the late Sinian,but also holds significant implications for studying the early life evolution. The Dengying Formation is characterized by a high abundance of calcimicrolith,which may provide a substantial basis for future exploration of oil and gas reservoirs.
FAN Chengmeng,YANG Hailin,YANG Yang et al. Calcimicrolith types and paleoenvironment evolution of the Sinian Dengying Formation in northern margin of Huangling Uplift,Three Gorges of Hubei Province[J]. JOPC, 2024, 26(5): 1256-1270.
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