【摘要】 【目的】晚古生代大冰期是陆地生态系统繁盛以来最显著的冰川事件，是由多个离散的冰期和间冰期交替组成的动态变化过程。这一时期也发生了多次全球变暖事件，近年来引起学界的广泛关注。其中，在晚宾夕法尼亚世卡西莫夫期和格舍尔期界线（Kasimovian-Gzhelian Boundary,KGB）附近记录了一次短暂而显著的碳同位素负漂事件，并伴随显著的全球变暖，称之为KGB变暖事件。这一冰室气候背景下的变暖事件具有重要的研究意义，然而对该变暖事件的研究仍处于起步阶段。【方法】选取华南板块罗甸盆地纳庆、上隆和纳绕剖面，对各自上宾夕法尼亚亚统卡西莫夫阶和格舍尔阶界线附近约20 m厚的地层开展详细的沉积学和碳同位素地层学工作，分析KGB变暖事件的沉积响应，并与全球不同地区的进行对比，为进一步开展相关研究打下基础。【结果】共识别出泥状灰岩、生物碎屑粒泥灰岩—生物碎屑泥粒灰岩、正粒序生物碎屑泥粒灰岩和黑色钙质泥岩4种沉积岩相，指示了海平面频繁波动的深水斜坡沉积环境。上隆剖面新报道的碳同位素记录与纳庆和纳绕剖面已发表的碳同位素记录显示出一致的变化趋势，KGB附近的碳同位素负漂移在全球多个不同剖面均有记录。研究层段牙形刺Heckelina eudoraensis带、Idiognathodus naraoensis带和H. simulator带底部记录的3次古水深的周期性变化与前人建立的天文旋回和全球典型沉积盆地的沉积旋回具有良好的对应关系。【结论】宾夕法尼亚亚纪晚期变暖事件（即KGB变暖事件）是一次全球性的气候事件，华南罗甸盆地相关研究可作为该事件研究和全球对比的重要参考。更多还原

【Abstract】 [Objective] The Late Paleozoic Ice Age is the most remarkable icehouse period since the flourish of the terrestrial ecosystem and is characterized by multiple discrete glacial and interglacial periods. Several global warming events occurred during the Late Paleozoic Ice Age, and these events have received extensive attention in recent years. An abrupt negative excursion in carbon isotopes(δ¹³C) was recorded near the Late Pennsylvanian Kasimovian-Gzhelian Boundary（KGB）, accompanied by significant global warming. The KGB warming event against the background of the interglacial period of the icehouse climate is of great interest, but the study of this warming event is still in its initial stages.[Methods] Here, detailed sedimentological and carbon isotope stratigraphic studies were carried out on the ～20 m-thick strata across the KGB in the Naqing, Shanglong, and Narao sections of the Luodian Basin in South China.[Results] Four sedimentary lithofacies were identified-lime mudstone facies, bioclastic wacke to packstone facies, normal-graded packstone facies, and dark calcareous mudstone facies-indicating a deep-water slope environment with frequent sea-level fluctuations. The newly obtained carbonate δ¹³C record from the Shanglong section can be compared with the previously published records from the Naqing and Narao sections, and the negative excursion in δ¹³C across the KGB is recorded around the world. Three cycles of paleo-water-depth variation at the conodont Heckelina eudoraensis zone, Idiognathodus naraoensis zone, and the bottom of the H. simulator zone in the study interval showed similar pace with astronomical cycles and can be correlated to those of the North American Midcontinent.[Conclusions] The studied successions of the Luodian Basin provide an important reference for the study of the KGB warming event.更多还原