{"title":"Major and trace element geochemistry of Albian and Turonian shales from the Southern Benue trough, Nigeria","authors":"L.C. Amajor","doi":"10.1016/0899-5362(87)90002-9","DOIUrl":null,"url":null,"abstract":"<div><p>A geochemical study on the Albian and Turonian shales from the southern Benee trough of Nigeria was carried out to establish their geochemical fingerprints.</p><p>The results show that these shale units are geochemically dissimilar both in major element oxides, trace and some rare earth elements. The element pairs which differentiate them best are MgO/Fe<sub>2</sub>O<sub>3</sub>, MgO/MnO, CaO/P<sub>2</sub>O<sub>5</sub>, CaO/Sr, K<sub>2</sub>O/Rb, Zr/P<sub>2</sub>O<sub>5</sub>, Pb/Th, Sr/Rb and Zr/Y.</p><p>The Albian shales are chemically fairly similar to the North American Albian Mowry shale (sediments of shallow restricted inland seas) whereas the Turonian shales compare favourably well with the average normal shales.</p><p>Changes in source rock characteristics, paleo-depositional environments and diagenesis are collectively thought to have caused the variation in geochemistry of these shales. The paleogeographic significance of the chemical variation is discussed.</p></div>","PeriodicalId":100749,"journal":{"name":"Journal of African Earth Sciences (1983)","volume":"6 5","pages":"Pages 633-641"},"PeriodicalIF":0.0000,"publicationDate":"1987-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0899-5362(87)90002-9","citationCount":"46","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of African Earth Sciences (1983)","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/0899536287900029","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 46
Abstract
A geochemical study on the Albian and Turonian shales from the southern Benee trough of Nigeria was carried out to establish their geochemical fingerprints.
The results show that these shale units are geochemically dissimilar both in major element oxides, trace and some rare earth elements. The element pairs which differentiate them best are MgO/Fe2O3, MgO/MnO, CaO/P2O5, CaO/Sr, K2O/Rb, Zr/P2O5, Pb/Th, Sr/Rb and Zr/Y.
The Albian shales are chemically fairly similar to the North American Albian Mowry shale (sediments of shallow restricted inland seas) whereas the Turonian shales compare favourably well with the average normal shales.
Changes in source rock characteristics, paleo-depositional environments and diagenesis are collectively thought to have caused the variation in geochemistry of these shales. The paleogeographic significance of the chemical variation is discussed.
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