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<p>The Western Mediterranean has undergone complex subduction and collision between the African and Iberian plates, influenced by slab segmentation and melt generation. Despite numerous studies aimed at understanding these connections, the style of subduction remains controversial. Utilizing a compilation of geophysical data and a new map of magmatic suites along the Western Betic Cordillera, along with geochemical and geochronological analyses, this paper presents a 3D reconstruction of a segmented subducting slab beneath the Gibraltar Arc, with a focus on the nature and timing of slab tearing and magmatism. Results suggest that magmatism was coeval with the retreating of subduction and slab tearing along the Antequera Fault Zone, a reactivated Mesozoic rift transfer fault. Slab tearing facilitated asthenospheric upwelling, triggering a localized thermal pulse in the upper plate during the Early Miocene. Zircon U–Pb geochronology witnesses this thermal event with the formation, emplacement, and crystallization of leucogranitic melts at low-pressure conditions, featuring both simple zircons (sometimes with inherited cores) and complex zircons (with rim dissolution and regrowth in host metamorphic units). Our findings demonstrate how inherited rift-related structures can drive slab tearing and asthenospheric upwelling, shaping the spatial and temporal patterns of magmatism and high-temperature metamorphism in complex subduction systems.</p>

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Evidence of slab tearing on an inherited Mesozoic rift transfer fault in the Betic Cordillera

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年8月7日

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  • Antonio Pedrera,
  • Juan Díaz-Alvarado,
  • Antonio Azor,
  • Andrés Folguera,
  • Luis González-Menéndez,
  • Jesús García-Senz,
  • Pedro Pablo Hernaiz-Huerta,
  • Ana Ruiz-Constán,
  • Carlos Marín-Lechado,
  • Adrià Ramos,
  • Berta López-Mir,
  • Carmen Rodríguez,
  • Roberto Jiménez-Borrego,
  • Károly Hidas

摘要

The Western Mediterranean has undergone complex subduction and collision between the African and Iberian plates, influenced by slab segmentation and melt generation. Despite numerous studies aimed at understanding these connections, the style of subduction remains controversial. Utilizing a compilation of geophysical data and a new map of magmatic suites along the Western Betic Cordillera, along with geochemical and geochronological analyses, this paper presents a 3D reconstruction of a segmented subducting slab beneath the Gibraltar Arc, with a focus on the nature and timing of slab tearing and magmatism. Results suggest that magmatism was coeval with the retreating of subduction and slab tearing along the Antequera Fault Zone, a reactivated Mesozoic rift transfer fault. Slab tearing facilitated asthenospheric upwelling, triggering a localized thermal pulse in the upper plate during the Early Miocene. Zircon U–Pb geochronology witnesses this thermal event with the formation, emplacement, and crystallization of leucogranitic melts at low-pressure conditions, featuring both simple zircons (sometimes with inherited cores) and complex zircons (with rim dissolution and regrowth in host metamorphic units). Our findings demonstrate how inherited rift-related structures can drive slab tearing and asthenospheric upwelling, shaping the spatial and temporal patterns of magmatism and high-temperature metamorphism in complex subduction systems.