肥城邓家庄剖面寒武系微生物碳酸盐岩沉积序列

山东肥城邓家庄剖面寒武系出露连续，构成了7个三级层序。微生物碳酸盐岩主要发育在高位体系域和强迫型海退体系域单元中，以徐庄组凝块石、张夏组核形石、长山组叠层石、凤山组均一石为代表，是研究早古生代微生物碳酸盐岩复苏期的良好实例。多样化的微生物碳酸盐岩中可见大量保存精美的附枝菌（Epiphyton）、葛万菌（Girvanella）以及肾形菌（Renalcis）等钙化微生物残余物，指示了微生物碳酸盐岩形成与蓝细菌为主导的微生物新陈代谢活动密切相关。此外，微生物碳酸盐岩沉积特征反映了生长环境的分异性:均一石、凝块石分别生长在潮下带下部、上部；柱状叠层石主要发育在能量较高的潮间带环境；核形石指示了沉积环境浅且能量高的鲕粒滩相沉积环境。邓家庄寒武系剖面微生物碳酸盐岩为了解寒武纪地球微生物、古环境、古气候提供了重要的岩石记录。

Sedimentary Succession of Cambrian Microbial Carbonates at Dengjiazhuang Section at Feicheng

The Dengjiazhuang section at Feicheng city, Shandong province, is characterized by a continuous Cambrian stratigraphic succession comprising seven third-order sequences. Microbial carbonates in the Dengjiazhuang section were developed in the HST and FRST, represented by thrombolite in the Xuzhuang Formation, oncolite in the Zhangxia Formation, dendrite in the Gushan Formation, stromatolite in the Changshan Formation, and leiolite in the Fengshan Formation, which is a typical example for studying a resuscitate period of microbial carbonates in the Early Paleozoic. Besides, a large number of well-preserved calcified microorganism fossils such as Epiphyton, Girvanella and Renalcis spp. are found in the microbial carbonates, which indicates that there are complex microbial metabolic activities led by cyanobacteria in the microbial mat during the formation of carbonates. Furthermore, the sedimentary characteristics of the microbial carbonates reflect the diversity of sedimentary environments. Leiolite and thrombolite grew respectively in the lower and upper part of the subtidal zone; columnar stromatolites were developed generally in the high-energy intertidal zone; oncolites indicate oolitic beach facies with shallow water and high energy. Therefore, the diversity of microbial carbonates at the Dengjiazhuang section in the Cambrian provides an important rock record for the study of earth microorganisms, paleoenvironment and paleoclimate in the Cambrian.