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U-Pb geochronology of pegmatites from the Rhodope Metamorphic Complex.

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Title: U-Pb geochronology of pegmatites from the Rhodope Metamorphic Complex.
Authors: Grozdev, Valentin1 val.grozdev@gmail.com, Vassileva, Rossitsa D.1 rosivas@geology.bas.bg, Georgieva, Sylvina1 sylvina@geology.bas.bg
Source: Review of the Bulgarian Geological Society. 2025, Vol. 86 Issue 1, p13-38. 26p.
Subjects: Pegmatites, Zircon, Titanates, Cenozoic Era, Mineralogical chemistry, Radioactive dating
Geographic Terms: Rhodope Mountains
Abstract: The present study reports new U-Pb LA-ICP-MS isotope ages based on zircons and titanites. The majority of the selected for investigation pegmatite bodies are hosted by the variegated units, part of the Middle Allochthon of the Rhodope metamorphic complex. Most of the studied pegmatites are concordant and some are oblique with respect to the metamorphic foliation. In the majority of cases, the direct genetic link to particular magmatic intrusions is not obvious. Major constituents in the mineral composition are feldspars - both plagioclase and K-feldspar, quartz and occasionally micas. Compositionally, the zircons from pegmatites reveal increased U content. The geochronological data is complemented by ages of the host metamorphic basement. U-Pb geochronology on zircon and titanite established that most of the studied pegmatites are formed in the Late Cretaceous - Early Paleocene (66-55 Ma) with slight exceptions ~100 Ma (on the Early/Late Cretaceous boundary). The obtained U-Pb dating confirm the younger Cenozoic age of the pegmatites from the Rhodope metamorphic complex reported by other authors. [ABSTRACT FROM AUTHOR]
Copyright of Review of the Bulgarian Geological Society is the property of Bulgarian Geological Society and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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Header DbId: egs
DbLabel: Engineering Source
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PubTypeId: academicJournal
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  Data: U-Pb geochronology of pegmatites from the Rhodope Metamorphic Complex.
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  Data: <searchLink fieldCode="AR" term="%22Grozdev%2C+Valentin%22">Grozdev, Valentin</searchLink><relatesTo>1</relatesTo><i> val.grozdev@gmail.com</i><br /><searchLink fieldCode="AR" term="%22Vassileva%2C+Rossitsa+D%2E%22">Vassileva, Rossitsa D.</searchLink><relatesTo>1</relatesTo><i> rosivas@geology.bas.bg</i><br /><searchLink fieldCode="AR" term="%22Georgieva%2C+Sylvina%22">Georgieva, Sylvina</searchLink><relatesTo>1</relatesTo><i> sylvina@geology.bas.bg</i>
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  Data: <searchLink fieldCode="JN" term="%22Review+of+the+Bulgarian+Geological+Society%22">Review of the Bulgarian Geological Society</searchLink>. 2025, Vol. 86 Issue 1, p13-38. 26p.
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  Data: <searchLink fieldCode="DE" term="%22Pegmatites%22">Pegmatites</searchLink><br /><searchLink fieldCode="DE" term="%22Zircon%22">Zircon</searchLink><br /><searchLink fieldCode="DE" term="%22Titanates%22">Titanates</searchLink><br /><searchLink fieldCode="DE" term="%22Cenozoic+Era%22">Cenozoic Era</searchLink><br /><searchLink fieldCode="DE" term="%22Mineralogical+chemistry%22">Mineralogical chemistry</searchLink><br /><searchLink fieldCode="DE" term="%22Radioactive+dating%22">Radioactive dating</searchLink>
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  Data: <searchLink fieldCode="DE" term="%22Rhodope+Mountains%22">Rhodope Mountains</searchLink>
– Name: Abstract
  Label: Abstract
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  Data: The present study reports new U-Pb LA-ICP-MS isotope ages based on zircons and titanites. The majority of the selected for investigation pegmatite bodies are hosted by the variegated units, part of the Middle Allochthon of the Rhodope metamorphic complex. Most of the studied pegmatites are concordant and some are oblique with respect to the metamorphic foliation. In the majority of cases, the direct genetic link to particular magmatic intrusions is not obvious. Major constituents in the mineral composition are feldspars - both plagioclase and K-feldspar, quartz and occasionally micas. Compositionally, the zircons from pegmatites reveal increased U content. The geochronological data is complemented by ages of the host metamorphic basement. U-Pb geochronology on zircon and titanite established that most of the studied pegmatites are formed in the Late Cretaceous - Early Paleocene (66-55 Ma) with slight exceptions ~100 Ma (on the Early/Late Cretaceous boundary). The obtained U-Pb dating confirm the younger Cenozoic age of the pegmatites from the Rhodope metamorphic complex reported by other authors. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Review of the Bulgarian Geological Society is the property of Bulgarian Geological Society and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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      – Type: doi
        Value: 10.52215/10.52215/rev.bgs.2025.86.1.13
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      – Code: eng
        Text: English
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        PageCount: 26
        StartPage: 13
    Subjects:
      – SubjectFull: Pegmatites
        Type: general
      – SubjectFull: Zircon
        Type: general
      – SubjectFull: Titanates
        Type: general
      – SubjectFull: Cenozoic Era
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      – SubjectFull: Mineralogical chemistry
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      – SubjectFull: Radioactive dating
        Type: general
      – SubjectFull: Rhodope Mountains
        Type: general
    Titles:
      – TitleFull: U-Pb geochronology of pegmatites from the Rhodope Metamorphic Complex.
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            NameFull: Grozdev, Valentin
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            NameFull: Vassileva, Rossitsa D.
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              Text: 2025
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              Y: 2025
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