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Geochemistry of Clinopyroxenes from Kamafugites of the Bunyaruguru Volcanic Field, East African Rift.

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Title: Geochemistry of Clinopyroxenes from Kamafugites of the Bunyaruguru Volcanic Field, East African Rift.
Authors: Muravyeva, N. S.1 (AUTHOR) nmur@mail.ru, Simakin, S. G.2 (AUTHOR), Senin, V. G.1 (AUTHOR)
Source: Geochemistry International. Apr2026, Vol. 64 Issue 4, p309-322. 14p.
Subject Terms: *Trace elements, *Pyroxene, *Rifts (Geology), *Metasomatism, *Volcanology, *Ultrabasic rocks, *Geochemistry, *Volcanic fields
Abstract: The paper presents pioneering data on the trace-element (Cr, Rb, Sr, Zr, Ba, Ce, Sm, Gd, Er, Yb, Hf, U, Th, Lu, Dy, Eu, Nd, and La) composition of clinopyroxenes in phenocrysts and xenoliths from ultrapotassic rocks of the Bunyaruguru volcanic field, Toro-Ankole Province, East African Rift. Contents of trace elements in clinopyroxenes from individual volcanoes within the Bunyaruguru volcanic field are different: clinopyroxenes from the Nyungu crater are enriched in Zr (up to ∼1000 ppm), whereas clinopyroxenes from the Kazimiro crater are enriched in Nb (up to ∼30 ppm). The obtained results led us to estimate crystallization parameters of the clinopyroxenes, clarify differences in the composition of kamafugite lava sources, and identify the different types of mantle metasomatism within a single volcanic field. [ABSTRACT FROM AUTHOR]
Database: Energy & Power Source
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DbLabel: Energy & Power Source
An: 193062981
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PubTypeId: academicJournal
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  Label: Title
  Group: Ti
  Data: Geochemistry of Clinopyroxenes from Kamafugites of the Bunyaruguru Volcanic Field, East African Rift.
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  Data: <searchLink fieldCode="AR" term="%22Muravyeva%2C+N%2E+S%2E%22">Muravyeva, N. S.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> nmur@mail.ru</i><br /><searchLink fieldCode="AR" term="%22Simakin%2C+S%2E+G%2E%22">Simakin, S. G.</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Senin%2C+V%2E+G%2E%22">Senin, V. G.</searchLink><relatesTo>1</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Geochemistry+International%22">Geochemistry International</searchLink>. Apr2026, Vol. 64 Issue 4, p309-322. 14p.
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  Data: *<searchLink fieldCode="DE" term="%22Trace+elements%22">Trace elements</searchLink><br />*<searchLink fieldCode="DE" term="%22Pyroxene%22">Pyroxene</searchLink><br />*<searchLink fieldCode="DE" term="%22Rifts+%28Geology%29%22">Rifts (Geology)</searchLink><br />*<searchLink fieldCode="DE" term="%22Metasomatism%22">Metasomatism</searchLink><br />*<searchLink fieldCode="DE" term="%22Volcanology%22">Volcanology</searchLink><br />*<searchLink fieldCode="DE" term="%22Ultrabasic+rocks%22">Ultrabasic rocks</searchLink><br />*<searchLink fieldCode="DE" term="%22Geochemistry%22">Geochemistry</searchLink><br />*<searchLink fieldCode="DE" term="%22Volcanic+fields%22">Volcanic fields</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: The paper presents pioneering data on the trace-element (Cr, Rb, Sr, Zr, Ba, Ce, Sm, Gd, Er, Yb, Hf, U, Th, Lu, Dy, Eu, Nd, and La) composition of clinopyroxenes in phenocrysts and xenoliths from ultrapotassic rocks of the Bunyaruguru volcanic field, Toro-Ankole Province, East African Rift. Contents of trace elements in clinopyroxenes from individual volcanoes within the Bunyaruguru volcanic field are different: clinopyroxenes from the Nyungu crater are enriched in Zr (up to ∼1000 ppm), whereas clinopyroxenes from the Kazimiro crater are enriched in Nb (up to ∼30 ppm). The obtained results led us to estimate crystallization parameters of the clinopyroxenes, clarify differences in the composition of kamafugite lava sources, and identify the different types of mantle metasomatism within a single volcanic field. [ABSTRACT FROM AUTHOR]
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RecordInfo BibRecord:
  BibEntity:
    Identifiers:
      – Type: doi
        Value: 10.1134/S001670292560124X
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 14
        StartPage: 309
    Subjects:
      – SubjectFull: Trace elements
        Type: general
      – SubjectFull: Pyroxene
        Type: general
      – SubjectFull: Rifts (Geology)
        Type: general
      – SubjectFull: Metasomatism
        Type: general
      – SubjectFull: Volcanology
        Type: general
      – SubjectFull: Ultrabasic rocks
        Type: general
      – SubjectFull: Geochemistry
        Type: general
      – SubjectFull: Volcanic fields
        Type: general
    Titles:
      – TitleFull: Geochemistry of Clinopyroxenes from Kamafugites of the Bunyaruguru Volcanic Field, East African Rift.
        Type: main
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      – PersonEntity:
          Name:
            NameFull: Muravyeva, N. S.
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          Name:
            NameFull: Simakin, S. G.
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          Name:
            NameFull: Senin, V. G.
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          Dates:
            – D: 15
              M: 04
              Text: Apr2026
              Type: published
              Y: 2026
          Identifiers:
            – Type: issn-print
              Value: 00167029
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            – Type: volume
              Value: 64
            – Type: issue
              Value: 4
          Titles:
            – TitleFull: Geochemistry International
              Type: main
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