A new palynological assemblage of the Nantun Formation in the Huhehu Sag, Hailar Basin, NE China: Implications for paleoenvironments

IF 1.9 3区 地球科学 Q1 GEOLOGY Cretaceous Research Pub Date : 2024-11-19 DOI:10.1016/j.cretres.2024.106054
Yan Zhang , Yun-fei Xue , Chuan-biao Wan , Wen-chun Ge
{"title":"A new palynological assemblage of the Nantun Formation in the Huhehu Sag, Hailar Basin, NE China: Implications for paleoenvironments","authors":"Yan Zhang ,&nbsp;Yun-fei Xue ,&nbsp;Chuan-biao Wan ,&nbsp;Wen-chun Ge","doi":"10.1016/j.cretres.2024.106054","DOIUrl":null,"url":null,"abstract":"<div><div>The Cretaceous period, recognized as one of the warmest in Earth's geological timeline, is crucial for understanding paleoclimatic conditions. Palynological analyses, focusing on spores and pollen, play a vital role in reconstructing paleoenvironmental. This study emphasizes the relationship between climate and plant distribution through detailed palynological analyses. It reports the first discovery of abundant and diverse palynomorphs from the lower Nantun Fm in the Hailar Basin, Inner Mongolia, China. The identified palynological assemblage, termed the <em>Protoconiferus flavus</em>—<em>Pinuspollenites</em> sp.—<em>Quantouendinium</em> sp. (PPQ) assemblage, provides significant insights into the Early Cretaceous flora of northeastern China. The PPQ assemblage can be chronologically attributed to the Hauterivian–early Barremian interval, consistent with the LA–ICP–MS zircon U–Pb isotope ages of the Nantun Fm volcanic rocks. Paleovegetation reconstruction reveals a prevailing dominance of coniferous vegetation in the region represented by the PPQ assemblage, indicative of a characteristic of mid-to high-latitude mountain coniferous forest landscape. The climatic was mainly humid or semi-humid. This conclusion is supported by the abundance of freshwater dinocyst and green algae fossils, suggesting that sedimentation occurred in a shallow, freshwater hydrostatic environment with an estimated water temperature of approximately 20–25 °C. The environment was also nutrient-rich, which facilitated the proliferation of green algae such as <em>Scenedesmus</em>, <em>Pediastrum</em>, and <em>Tetraedron</em>. Identifying this assemblage is important for determining the age of the lower Nantun Fm, reconstructing paleovegetation and paleoclimate, and analyzing the lacustrine water conditions during the sedimentary period in the Hailar Basin.</div></div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"167 ","pages":"Article 106054"},"PeriodicalIF":1.9000,"publicationDate":"2024-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Cretaceous Research","FirstCategoryId":"89","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0195667124002271","RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"GEOLOGY","Score":null,"Total":0}
引用次数: 0

Abstract

The Cretaceous period, recognized as one of the warmest in Earth's geological timeline, is crucial for understanding paleoclimatic conditions. Palynological analyses, focusing on spores and pollen, play a vital role in reconstructing paleoenvironmental. This study emphasizes the relationship between climate and plant distribution through detailed palynological analyses. It reports the first discovery of abundant and diverse palynomorphs from the lower Nantun Fm in the Hailar Basin, Inner Mongolia, China. The identified palynological assemblage, termed the Protoconiferus flavusPinuspollenites sp.—Quantouendinium sp. (PPQ) assemblage, provides significant insights into the Early Cretaceous flora of northeastern China. The PPQ assemblage can be chronologically attributed to the Hauterivian–early Barremian interval, consistent with the LA–ICP–MS zircon U–Pb isotope ages of the Nantun Fm volcanic rocks. Paleovegetation reconstruction reveals a prevailing dominance of coniferous vegetation in the region represented by the PPQ assemblage, indicative of a characteristic of mid-to high-latitude mountain coniferous forest landscape. The climatic was mainly humid or semi-humid. This conclusion is supported by the abundance of freshwater dinocyst and green algae fossils, suggesting that sedimentation occurred in a shallow, freshwater hydrostatic environment with an estimated water temperature of approximately 20–25 °C. The environment was also nutrient-rich, which facilitated the proliferation of green algae such as Scenedesmus, Pediastrum, and Tetraedron. Identifying this assemblage is important for determining the age of the lower Nantun Fm, reconstructing paleovegetation and paleoclimate, and analyzing the lacustrine water conditions during the sedimentary period in the Hailar Basin.
查看原文
分享 分享
微信好友 朋友圈 QQ好友 复制链接
本刊更多论文
海拉尔盆地呼和湖凹陷南屯组新孢粉组合及其古环境意义
白垩纪被认为是地球地质年代史上最温暖的时期之一,对了解古气候条件至关重要。孢粉学分析以孢子和花粉为重点,在古环境重建中起着至关重要的作用。本研究通过孢粉学的详细分析,强调气候与植物分布的关系。本文报道了在中国内蒙古海拉尔盆地南屯组下部首次发现的丰富多样的岩型。该孢粉组合被命名为Protoconiferus flavus-Pinuspollenites sp. - quantouendinium sp. (PPQ)组合,为了解中国东北早白垩世植物区系提供了重要的信息。PPQ组合的年代学可归因于hauteriian—早巴雷米亚期,与南屯Fm火山岩的LA-ICP-MS锆石U-Pb同位素年龄一致。古植被重建显示,以PPQ组合为代表的区域以针叶林植被为主,具有中高纬山地针叶林景观特征。气候主要是湿润或半湿润的。这一结论得到了丰富的淡水藻囊和绿藻化石的支持,表明沉积发生在浅层淡水静水环境中,估计水温约为20-25°C。环境营养丰富,有利于绿藻(如Scenedesmus、Pediastrum和Tetraedron)的繁殖。识别该组合对于确定海拉尔盆地南屯组下段时代、重建古植被和古气候、分析沉积时期湖泊水条件具有重要意义。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
求助全文
约1分钟内获得全文 去求助
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.
期刊最新文献
Two new species of the extinct subfamily Alitrepaninae (Coleoptera: Bostrichidae) from the Upper Cretaceous (Cenomanian) Kachin amber in northern Myanmar A new palynological assemblage of the Nantun Formation in the Huhehu Sag, Hailar Basin, NE China: Implications for paleoenvironments Exceptional preservation in mayfly nymphs (Insecta: Ephemeroptera) from the Early Cretaceous of the Las Hoyas fossil site Editorial Board Reassessment of an azhdarchid pterosaur specimen from the Mifune Group, Upper Cretaceous of Japan
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
现在去查看 取消
×
提示
确定
0
微信
客服QQ
Book学术公众号 扫码关注我们
反馈
×
意见反馈
请填写您的意见或建议
请填写您的手机或邮箱
已复制链接
已复制链接
快去分享给好友吧!
我知道了
×
扫码分享
扫码分享
Book学术官方微信
Book学术文献互助
Book学术文献互助群
群 号:481959085
Book学术
文献互助 智能选刊 最新文献 互助须知 联系我们:info@booksci.cn
Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。
Copyright © 2023 Book学术 All rights reserved.
ghs 京公网安备 11010802042870号 京ICP备2023020795号-1