{"title":"OXYGEN AND CARBON ISOTOPE STUDY IN THE LATE EOCENE SEDIMENTS OF POSSAGNO (NORTHERN ITALY)","authors":"Hedi Oberhänsli, Angela Grünig, René Herb","doi":"10.54103/2039-4942/13429","DOIUrl":null,"url":null,"abstract":"Oxygen and carbon isotope data of several benthic and planktonic species of Foraminifera from a regressive sequence in northeastern Italy indicate a watermass change during the Late Eocene, In the middle of zone P 16 the Belluno Basin Was temporari/y cut off from the open ocean. This was probably provoked by 1) worldwide sea—level Iowering during the Late Eocene •and 2) tectonic activity in the relict Tethyan realm and the adjacent areas. The isolation apparently resulted in a temporary salinity increase in the relict basin. \nA pronounced oxygen isotope excursion at the base of P 16 could be explained by diagenetic changes. The formation of globular cement in the chambcr cavities of Foraminifera is due either to phreatic water infiltration promoted by the preceding shoaling of the sedimentary environment, or to a temporarily increased geothermal gradient resulting from the volcanic activity in the Colli Euganei. \n The genera and species of the superfamily Buliminacea are enriched in 16O relative to the taxa belonging to the superfamily Cassidulinacea. The δ18C of Nodosariacea are mostly intermediate. \nThe oxygen isotope fractionation of benthic Foraminifera caused by biologica) processes (i.e. vital effect) seems to be somehow related to the wall structure (e.g. systematic classification).","PeriodicalId":1,"journal":{"name":"Accounts of Chemical Research","volume":"10 2","pages":""},"PeriodicalIF":16.4000,"publicationDate":"2020-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Accounts of Chemical Research","FirstCategoryId":"89","ListUrlMain":"https://doi.org/10.54103/2039-4942/13429","RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CHEMISTRY, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
Abstract
Oxygen and carbon isotope data of several benthic and planktonic species of Foraminifera from a regressive sequence in northeastern Italy indicate a watermass change during the Late Eocene, In the middle of zone P 16 the Belluno Basin Was temporari/y cut off from the open ocean. This was probably provoked by 1) worldwide sea—level Iowering during the Late Eocene •and 2) tectonic activity in the relict Tethyan realm and the adjacent areas. The isolation apparently resulted in a temporary salinity increase in the relict basin.
A pronounced oxygen isotope excursion at the base of P 16 could be explained by diagenetic changes. The formation of globular cement in the chambcr cavities of Foraminifera is due either to phreatic water infiltration promoted by the preceding shoaling of the sedimentary environment, or to a temporarily increased geothermal gradient resulting from the volcanic activity in the Colli Euganei.
The genera and species of the superfamily Buliminacea are enriched in 16O relative to the taxa belonging to the superfamily Cassidulinacea. The δ18C of Nodosariacea are mostly intermediate.
The oxygen isotope fractionation of benthic Foraminifera caused by biologica) processes (i.e. vital effect) seems to be somehow related to the wall structure (e.g. systematic classification).
期刊介绍:
Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance.
Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.