Calcareous Nannofossil Stratigraphy across the Paleocene-Eocene Transition at the Gunnah Section, Farafra Oasis, Western Desert, Egypt

IF 1.5 4区 地球科学 Q2 GEOLOGY Journal of Geology Pub Date : 2020-06-16 DOI:10.1086/709359
Atef M. Kasem, S. Wise, M. Faris, S. Farouk, E. Zahran
{"title":"Calcareous Nannofossil Stratigraphy across the Paleocene-Eocene Transition at the Gunnah Section, Farafra Oasis, Western Desert, Egypt","authors":"Atef M. Kasem, S. Wise, M. Faris, S. Farouk, E. Zahran","doi":"10.1086/709359","DOIUrl":null,"url":null,"abstract":"Calcareous nannofossil, carbonate content, and δ18O and δ13C data were utilized to reveal the nature of the Paleocene-Eocene (P-E) boundary at the Gunnah section, Western Desert, Egypt. The uppermost Tarawan Formation (Fm.), Esna Fm., and the lowermost, Farafra Fm., were included in this study. Lithostratigraphically, the Esna Fm. was subdivided into the Hanadi, Dababiya Quarry, and Mahmiya Members. Three calcareous nannofossil zones (NP7/8, NP9, and NP10) and four subzones (NP9a, NP9b, NP10a, and NP10b) were recognized. The biostratigraphic significances of calcareoust nannofossil bioevents associated with the P-E boundary at the study section were discussed. The base of the Eocene was placed at the base of the Dababiya Quarry Member in coincidence with the base of subzone NP9b, which is coincident with the LOs of Rhomboaster cuspis, R. calcitrapa, R. bitrifidia, Pontosphaera pulchra, and Zygrhablithus bijugatus. However, Discoaster araneus first occurred about 3 m below the base of subzone NP9b. The global decreases of the δ13C and δ18O values and carbonate contents across the P-E boundary were documented in the Gunnah section, which represents one of the most expanded and complete P-E sequences in Egypt.","PeriodicalId":54826,"journal":{"name":"Journal of Geology","volume":"128 1","pages":"371 - 387"},"PeriodicalIF":1.5000,"publicationDate":"2020-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1086/709359","citationCount":"9","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Geology","FirstCategoryId":"89","ListUrlMain":"https://doi.org/10.1086/709359","RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"GEOLOGY","Score":null,"Total":0}
引用次数: 9

Abstract

Calcareous nannofossil, carbonate content, and δ18O and δ13C data were utilized to reveal the nature of the Paleocene-Eocene (P-E) boundary at the Gunnah section, Western Desert, Egypt. The uppermost Tarawan Formation (Fm.), Esna Fm., and the lowermost, Farafra Fm., were included in this study. Lithostratigraphically, the Esna Fm. was subdivided into the Hanadi, Dababiya Quarry, and Mahmiya Members. Three calcareous nannofossil zones (NP7/8, NP9, and NP10) and four subzones (NP9a, NP9b, NP10a, and NP10b) were recognized. The biostratigraphic significances of calcareoust nannofossil bioevents associated with the P-E boundary at the study section were discussed. The base of the Eocene was placed at the base of the Dababiya Quarry Member in coincidence with the base of subzone NP9b, which is coincident with the LOs of Rhomboaster cuspis, R. calcitrapa, R. bitrifidia, Pontosphaera pulchra, and Zygrhablithus bijugatus. However, Discoaster araneus first occurred about 3 m below the base of subzone NP9b. The global decreases of the δ13C and δ18O values and carbonate contents across the P-E boundary were documented in the Gunnah section, which represents one of the most expanded and complete P-E sequences in Egypt.
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
埃及西部沙漠Farafra绿洲Gunnah剖面古新世-始新世过渡期的钙质超微化石地层
利用钙质纳米化石、碳酸盐含量、δ18O和δ13C数据揭示了埃及西部沙漠Gunnah剖面古新世-始新世(P-E)界线的性质。最上面的塔拉望岛编队(Fm.),埃斯纳Fm。,以及最低的法拉法拉Fm。,被纳入本研究。岩石地层学上,埃斯纳组。被细分为Hanadi、Dababiya采石场和Mahmiya成员。发现3个钙质纳米化石带(NP7/8、NP9和NP10)和4个亚带(NP9a、NP9b、NP10a和NP10b)。讨论了研究剖面上与P-E边界有关的钙质纳米化石生物事件的生物地层学意义。始新世基底与NP9b亚带基底重合,与Rhomboaster cuspis、R. calcitrapa、R. bitrifidia、Pontosphaera pulchra、Zygrhablithus bijugatus的基底重合。然而,灾害首先发生在NP9b亚带底部以下约3 m处。古纳剖面的δ13C、δ18O值和碳酸盐含量总体上沿P-E边界下降,是埃及最完整的P-E序列之一。
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
Journal of Geology
Journal of Geology 地学-地质学
CiteScore
3.50
自引率
5.60%
发文量
0
审稿时长
3 months
期刊介绍: One of the oldest journals in geology, The Journal of Geology has since 1893 promoted the systematic philosophical and fundamental study of geology. The Journal publishes original research across a broad range of subfields in geology, including geophysics, geochemistry, sedimentology, geomorphology, petrology, plate tectonics, volcanology, structural geology, mineralogy, and planetary sciences. Many of its articles have wide appeal for geologists, present research of topical relevance, and offer new geological insights through the application of innovative approaches and methods.
期刊最新文献
Temperature is a cryptic factor shaping the geographical pattern of genetic variation in Ceratophyllum demersum across a subtropical freshwater lake. Contrasting detrital feldspar Pb isotope ratios and zircon geochronology to distinguish proximal vs. distal transport Eocene Andesitic Adakite from Lone Mountain, Southwestern Montana Enhancing DNA barcode reference libraries by harvesting terrestrial arthropods at the Smithsonian's National Museum of Natural History. Assessment of the Web Site Availability and Content of Pediatric Ophthalmology Fellowship Programs: A Cross-Sectional Nationwide Study.
×
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