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Silurian mafic magmatism related to post-collisional extension, Appalachian orogen, western Newfoundland.

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Τίτλος: Silurian mafic magmatism related to post-collisional extension, Appalachian orogen, western Newfoundland.
Συγγραφείς: Hinchey, A.M., Hinchey, J.G., Sandeman, H.A., Lissenberg, C.J., Rayner, N., Marin, D. Mendoza
Πηγή: Canadian Journal of Earth Sciences; 12/23/2025, Vol. 63, p1-22, 22p
Θεματικοί όροι: Silurian Period, Magmatism, Neotectonics, Analytical geochemistry, Orogeny
Γεωγραφικοί όροι: Appalachian Mountains, Newfoundland & Labrador
Περίληψη: Gabbroic intrusions provide direct evidence of magmatic processes operating within the lithosphere and at the lithosphere–asthenosphere boundary, offering insights into magmatic differentiation, crustal growth, mantle–crust interaction, and tectonic evolution. The Taylor Brook Gabbro Suite (TBGS) is the northwesternmost expression of middle Silurian magmatism in the northern Appalachians. The petrogenesis and geochemical characteristics of the TBGS and crosscutting silicic magmatism are explored through U–Pb geochronology, mineral chemistry, lithogeochemistry, and Sr–Nd isotopic analyses, illustrating a complex history of mantle-derived mafic magmatism. The U–Pb zircon sensitive high-resolution ion microprobe ages indicate that, although the intrusive history is complex, the TBGS represents a magmatic event at 431.0 ± 2.7/4.3 Ma that was subsequently intruded by silicic magmatism at 419.7 ± 3.0/4.5 Ma. The mineral chemistry and lithogeochemistry of the TBGS suggest fractional crystallization of a magmatic system as the primary differentiation mechanism. The TBGS is tholeiitic and transitional to calc-alkaline and consists of non-arc-like, continental magmas derived from an enriched mid-ocean ridge basalt-like source. The silicic samples are granitic, magnesian, and alkali calcic in composition. The isotopic signatures of the TBGS are mostly juvenile with εNd(430 Ma) ranging from −1.1 to +6.4 and 87Sr/86Sr(i) values ranging from 0.703373 to 0.708250, with one sample having an εNd(430 Ma) of −8.6, indicating a minor role of crustal contamination by Mesoproterozoic to Neoproterozoic basement rocks. Magma ascent may have utilized inherited deep crustal structures, such as the precursor to the Doucers Valley Fault/Long Range-Cabot Fault systems. Lithospheric extension likely caused by slab rollback created a window that allowed for asthenospheric upwelling, inducing partial melting and generation of the TBGS magmas. [ABSTRACT FROM AUTHOR]
Copyright of Canadian Journal of Earth Sciences is the property of Canadian Science Publishing 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.)
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  Data: Silurian mafic magmatism related to post-collisional extension, Appalachian orogen, western Newfoundland.
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  Data: <searchLink fieldCode="AR" term="%22Hinchey%2C+A%2EM%2E%22">Hinchey, A.M.</searchLink><br /><searchLink fieldCode="AR" term="%22Hinchey%2C+J%2EG%2E%22">Hinchey, J.G.</searchLink><br /><searchLink fieldCode="AR" term="%22Sandeman%2C+H%2EA%2E%22">Sandeman, H.A.</searchLink><br /><searchLink fieldCode="AR" term="%22Lissenberg%2C+C%2EJ%2E%22">Lissenberg, C.J.</searchLink><br /><searchLink fieldCode="AR" term="%22Rayner%2C+N%2E%22">Rayner, N.</searchLink><br /><searchLink fieldCode="AR" term="%22Marin%2C+D%2E+Mendoza%22">Marin, D. Mendoza</searchLink>
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  Data: Canadian Journal of Earth Sciences; 12/23/2025, Vol. 63, p1-22, 22p
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  Data: <searchLink fieldCode="DE" term="%22Silurian+Period%22">Silurian Period</searchLink><br /><searchLink fieldCode="DE" term="%22Magmatism%22">Magmatism</searchLink><br /><searchLink fieldCode="DE" term="%22Neotectonics%22">Neotectonics</searchLink><br /><searchLink fieldCode="DE" term="%22Analytical+geochemistry%22">Analytical geochemistry</searchLink><br /><searchLink fieldCode="DE" term="%22Orogeny%22">Orogeny</searchLink>
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  Data: <searchLink fieldCode="DE" term="%22Appalachian+Mountains%22">Appalachian Mountains</searchLink><br /><searchLink fieldCode="DE" term="%22Newfoundland+%26+Labrador%22">Newfoundland & Labrador</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Gabbroic intrusions provide direct evidence of magmatic processes operating within the lithosphere and at the lithosphere–asthenosphere boundary, offering insights into magmatic differentiation, crustal growth, mantle–crust interaction, and tectonic evolution. The Taylor Brook Gabbro Suite (TBGS) is the northwesternmost expression of middle Silurian magmatism in the northern Appalachians. The petrogenesis and geochemical characteristics of the TBGS and crosscutting silicic magmatism are explored through U–Pb geochronology, mineral chemistry, lithogeochemistry, and Sr–Nd isotopic analyses, illustrating a complex history of mantle-derived mafic magmatism. The U–Pb zircon sensitive high-resolution ion microprobe ages indicate that, although the intrusive history is complex, the TBGS represents a magmatic event at 431.0 ± 2.7/4.3 Ma that was subsequently intruded by silicic magmatism at 419.7 ± 3.0/4.5 Ma. The mineral chemistry and lithogeochemistry of the TBGS suggest fractional crystallization of a magmatic system as the primary differentiation mechanism. The TBGS is tholeiitic and transitional to calc-alkaline and consists of non-arc-like, continental magmas derived from an enriched mid-ocean ridge basalt-like source. The silicic samples are granitic, magnesian, and alkali calcic in composition. The isotopic signatures of the TBGS are mostly juvenile with εNd<subscript>(430 Ma)</subscript> ranging from −1.1 to +6.4 and <superscript>87</superscript>Sr/<superscript>86</superscript>Sr<subscript>(i)</subscript> values ranging from 0.703373 to 0.708250, with one sample having an εNd<subscript>(430 Ma)</subscript> of −8.6, indicating a minor role of crustal contamination by Mesoproterozoic to Neoproterozoic basement rocks. Magma ascent may have utilized inherited deep crustal structures, such as the precursor to the Doucers Valley Fault/Long Range-Cabot Fault systems. Lithospheric extension likely caused by slab rollback created a window that allowed for asthenospheric upwelling, inducing partial melting and generation of the TBGS magmas. [ABSTRACT FROM AUTHOR]
– Name: Abstract
  Label:
  Group: Ab
  Data: <i>Copyright of Canadian Journal of Earth Sciences is the property of Canadian Science Publishing 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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    Identifiers:
      – Type: doi
        Value: 10.1139/cjes-2025-0016
    Languages:
      – Code: eng
        Text: English
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      Pagination:
        PageCount: 22
        StartPage: 1
    Subjects:
      – SubjectFull: Appalachian Mountains
        Type: general
      – SubjectFull: Newfoundland & Labrador
        Type: general
      – SubjectFull: Silurian Period
        Type: general
      – SubjectFull: Magmatism
        Type: general
      – SubjectFull: Neotectonics
        Type: general
      – SubjectFull: Analytical geochemistry
        Type: general
      – SubjectFull: Orogeny
        Type: general
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      – TitleFull: Silurian mafic magmatism related to post-collisional extension, Appalachian orogen, western Newfoundland.
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              Text: 12/23/2025
              Type: published
              Y: 2025
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