| Geochemistry of Late Cretaceous (60-67 Ma) igneous activities in the Hebrides Terrace seamount (guyot) area, Scotland |
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| 引用本文： | M. El-Tokhi,M. Omran,A. El-Muslem. Geochemistry of Late Cretaceous (60-67 Ma) igneous activities in the Hebrides Terrace seamount (guyot) area, Scotland[J]. 中国地球化学学报, 2005, 24(1) |
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| 作者姓名： | M. El-Tokhi M. Omran A. El-Muslem |
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| 作者单位： | Geology Dept.，Mansoura University，Damietta，34517，Egypt，Geology Dept.，Mansoura University，Damietta，34517，Egypt，Geology Dept.，United Arab Emirates University，17551，United Arab Emirates |
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| 摘 要： | 1Introduction Seamountsarethewell knownfeaturesinthe world’soceans,beingmostcommoninthePacific (Smith,1988;Pringleetal.,1991;Hasse,1991). Recentvolcanicactivityoccursinthezonesondi vergentorconvergentplatemarginsorintheintraplate regimes.Seamountsexisteitherasisolatedvolcanic edifices(Gardneretal.,1984;MertzandRenne, 1995)or,sometimes,formlinearchainstogetherwith oceanislands.Anumberofgeochronologicalinvestiga tionsonoceanislands(DuncanandMcDougall,1974; Dymond,1975;McDougall,1979…
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Geochemistry of Late Cretaceous (60- 67 Ma) igneous activities in the Hebrides Terrace seamount (guyot) area, Scotland |
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| M.El-Tokhi,M.Omran,A.El-Muslem. Geochemistry of Late Cretaceous (60- 67 Ma) igneous activities in the Hebrides Terrace seamount (guyot) area, Scotland[J]. Chinese Journal of Geochemistry, 2005, 24(1) |
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| Authors: | M.El-Tokhi M.Omran A.El-Muslem |
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| Abstract: | Tholeiitic basalts in various stages of alteration were dredged from Late Cretaceous volcanic rocks (60 -67 Ma) in the Hebrides Terrace seamount area in the Atlantic Ocean. These rocks are extrusive olivine basalts, including high- and low-Al basalts. High-Al basalts are depleted in MgO, CaO, Cr,Sc, V, Sr, Zr and enriched in TiO2, Na2 O, Nb, Rb as compared with low-Al basalts. Petrography and bulk-rock composition (major, trace and rare-earth elements) data defined clear tholeiitic suites displaying possible liquid lines of descent related to different degrees of crystal fractionation and partial melting.Isotopic dating of dredged samples gave the guyot an age of 60 - 67 Ma, in support of the assumption that it was formed during the Late Cretaceous. |
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| Keywords: | silicate analysis standard sample rock and mineral |
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