Palynological evidence for the Late Cretaceous lake transgression event in the Songliao Basin, NE China

IF 1.9 3区 地球科学 Q1 GEOLOGY Cretaceous Research Pub Date : 2024-08-05 DOI:10.1016/j.cretres.2024.105971
Qun Yang , Qiaoer Ying , Liqin Li , Jian Zhang , Fanhao Gong , Shouliang Sun , Hongshan Wang , Xiao Tan , Fei Liang
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Abstract

The lake transgression event (LTE) associated with a lake anoxic event (LAE) has been reported previously from the Cretaceous Nenjiang Formation in the Songliao Basin, NE China. Detailed studies based on sedimentology, dinoflagellates, ostracods, and biomarkers have provided important evidence for this LTE in Member 1 of the Nenjiang Formation (K2n1). However, the related floristic record has not received enough attention. In this paper, palynological data of borehole Ji Tao Di-1 (JTD-1) from the western slope of the Songliao Basin were analyzed to investigate vegetation and climate changes associated with this Cretaceous LTE. Three palynological sub-assemblages reflect significant paleovegetation and paleoclimate changes through this LTE and reveal ecosystem fluctuations related to the global Cretaceous oceanic anoxic event (OAE3). A significant increase in the relative abundance of Schizaeoisporites and Cyathidites spores may represent the LTE in the Nenjiang Formation. Principal Components Analysis (PCA) and Sporomorph EcoGroup (SEG) model indicate that climate changed from cool and humid subtropical before the LTE, to relatively warm temperate during the LTE and temperate after the LTE in this area. The relatively warmer and drier climate during the later period of the LTE may be influenced by the contemporaneous OAE3. After the LTE, the highland mixed forests were dominant, and a large number of angiosperms (i.e., members of the Proteaceae) occupied the ecological niches of the middle canopy, indicating that the flourishing of angiosperms in the late Santonian may be closely related to environmental disturbances resulted from the LTE and OAE.

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中国东北松辽盆地晚白垩世湖泊横断事件的古植物学证据
中国东北松辽盆地白垩纪嫩江地层曾报道过与湖泊缺氧事件(LAE)相关的湖泊横断事件(LTE)。基于沉积学、甲藻、桡足类动物和生物标志物的详细研究为嫩江地层(Kn)成员1的LTE提供了重要证据。然而,相关的植物记录却没有得到足够的重视。本文分析了松辽盆地西坡季陶地-1(JTD-1)钻孔的古生物学资料,研究了与该白垩纪LTE相关的植被和气候变化。三个古乐彩网亚组合反映了该LTE期间古植被和古气候的显著变化,揭示了与全球白垩纪大洋缺氧事件(OAE3)相关的生态系统波动。和孢子相对丰度的显著增加可能代表了嫩江地层中的LTE。主成分分析(PCA)和孢粉生态群(SEG)模型表明,该地区的气候从LTE前的凉爽潮湿的亚热带气候转变为LTE期间相对温暖的温带气候和LTE后的温带气候。LTE 后期相对温暖干燥的气候可能受到了同期 OAE3 的影响。LTE之后,高原混交林占优势,大量被子植物(即被子植物)占据了中层树冠的生态位,表明被子植物在晚山东期的繁盛可能与LTE和OAE造成的环境干扰密切相关。
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来源期刊
Cretaceous Research
Cretaceous Research 地学-地质学
CiteScore
4.10
自引率
19.00%
发文量
235
审稿时长
12 weeks
期刊介绍: Cretaceous Research provides a forum for the rapid publication of research on all aspects of the Cretaceous Period, including its boundaries with the Jurassic and Palaeogene. Authoritative papers reporting detailed investigations of Cretaceous stratigraphy and palaeontology, studies of regional geology, and reviews of recently published books are complemented by short communications of significant new findings. Papers submitted to Cretaceous Research should place the research in a broad context, with emphasis placed towards our better understanding of the Cretaceous, that are therefore of interest to the diverse, international readership of the journal. Full length papers that focus solely on a local theme or area will not be accepted for publication; authors of short communications are encouraged to discuss how their findings are of relevance to the Cretaceous on a broad scale. Research Areas include: • Regional geology • Stratigraphy and palaeontology • Palaeobiology • Palaeobiogeography • Palaeoceanography • Palaeoclimatology • Evolutionary Palaeoecology • Geochronology • Global events.
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