The middle Cambrian is an important period for the decline of metazoans and the resurgence of microbialites. Based on the analysis of carbon and oxygen isotopes, detrital zircon UPb dating, and geochemical analysis, the middle Cambrian DICE (Drumian carbon isotope excursion) event was identified and its relationship with microbialites and sea-level changes was discussed in the Tarim Basin. The DICE event has a negative shift in δ¹³C from 0‰ to −3.2‰. About 15 m below the DICE, the youngest age of the detrital zircon was 504.5 Ma, which was consistent with the age of the DICE event. Stromatolites are abundant and agnostoid trilobite Ptychagnostus atavus is absent in the Keping area. The DICE event corresponds to the occurrence of hemispherical stromatolites in the shallow-water platform. Lithologic association and terrigenous clastic index show that the marine transgression and condensation layer occurred during the DICE event, which may be synchronized with organic matter oxidation when stratified water masses overturned during transgression.

寒武纪中期是后生动物衰落和微生物重新兴起的重要时期。通过对碳和氧同位素分析，碎屑锆石U Pb测年以及地球化学分析，确定了塔里木盆地中寒武纪DICE（鼓状碳同位素漂移）事件，并探讨了其与微辉石和海平面变化的关系。骰子事件具有在δ的负移位¹³ C来自0‰至-3.2‰。在DICE下方约15 m，碎屑锆石的最小年龄为504.5 Ma，这与DICE事件的年龄一致。间质石丰富，不合类三叶虫Ptychagnostus atavus在科坪地区不存在。DICE事件对应于浅水平台中半球形叠层石的发生。岩石学联系和陆源碎屑指数表明，在DICE事件中发生了海侵和凝结层，当海侵过程中分层的水体倾覆时，海侵和凝结层可能与有机物氧化同步。