Paleoclimatic and paleogeographic significance of the early Santonian ice-rafted dropstones in the Songliao Basin, NE China

IF 1.9 3区 地球科学 Q1 GEOLOGY
Youfeng Gao , Zhiwen Tian , Xuejiao Qu , Guodong Wang , Pujun Wang , Yongjian Haung , Shuqin Zhang , Huafeng Tang
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Abstract

Two ice-rafted dropstones were discovered in the Yaojia Formation (early Santonian) of wells Ao14 and F247 in the Songliao Basin, northeastern China. The dropstone from well Ao14 was further studied using computed tomography (CT) scanning, sporopollen, carbon and oxygen isotope, and zircon U–Pb isotope analyses. The results show that the dropstone is composed of quartz monzonite and has an age of 178.0 ± 3.3 Ma. Based on the bedrock age analysis around the Songliao Basin, it is suggested that the dropstone in well Ao14 may have originated from the Zhangguangcai Range. The palynoflora assemblage indicates a mixed survival of cold and warm palynomorphs. The carbon and oxygen isotope compositions of the synsedimentary calcareous clasts surrounding the dropstone exhibit obvious negative biases, suggesting that glacier meltwater flowed into the paleo-lake, probably due to the significant topographic height difference between the Songliao Basin and adjacent areas during the early Santonian. Additionally, it can be inferred that coastal mountains formed in the Zhangguangcai Range area, which is located southeast of the Songliao Basin, and the dropstones derived from this region. During the cold season, the dropstones may be transported to the edge of Songliao Lake by avalanche and mixed with carbonate debris. As the seasons changed, the lake ice broke into pieces and carrying the dropstones and carbonate debris into the deep lake area. The present research provides direct evidence of a brief global cold event and the presence of high mountains in the southeastern Songliao Basin during the early Santonian in the Cretaceous greenhouse world.

中国东北松辽盆地早山统冰蚀滴石的古气候和古地理意义
在中国东北松辽盆地敖14井和F247井的姚家地层(早三屯统)中发现了两块冰蚀滴石。通过计算机断层扫描(CT)、孢粉、碳氧同位素和锆石U-Pb同位素分析,对Ao14井的水滴岩进行了进一步研究。结果表明,水滴岩由石英单斜岩组成,年龄为 178.0 ± 3.3 Ma。根据松辽盆地周围基岩年龄分析,Ao14井中的水滴岩可能起源于张广才岭。从古生植物组合来看,寒温型古生植物混合生存。落水岩周围的合成沉积钙质碎屑的碳和氧同位素组成显示出明显的负偏差,表明冰川融水流入古湖泊,这可能是由于松辽盆地与邻近地区在早三屯纪存在明显的地形高差所致。此外,还可以推断松辽盆地东南部的张广才岭地区形成了海岸山脉,水滴石穿就来源于这一地区。在寒冷季节,水滴石穿可能被雪崩搬运到松辽湖边缘,并与碳酸盐碎屑混合在一起。随着季节的变化,湖冰碎裂,携带着水滴石和碳酸盐碎屑进入深湖区。本研究提供了白垩纪温室世界三叠纪早期全球短暂寒冷事件和松辽盆地东南部高山存在的直接证据。
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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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