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This review examines the magnetostratigraphy and magnetic ages from the late Cenozoic in Argentina and southern Bolivia. In the province of Buenos Aires (BA), to the south, levels with fossil vertebrate fauna were assigned to different stage-ages and magnetic ages: Marplatan Stage-Age (early-mid to mid-late Gauss), Ensenadan Stage-Age (Matuyama and early Brunhes), and Lujanian Stage-Age (Brunhes). Other sections to the south of BA, with fauna assigned to the Marplatan Stage-Age, correspond to early Matuyama. To the E-SE, Gilbert magnetic ages were determined in Bahía Blanca, and Chasicó. In northern BA—including BA City—the studied section corresponds to Brunhes, Matuyama (Ensenadan Stage-Age), and late Gauss. In the city of La Plata (LP) toward the E, sediments assigned to the Bonaerean Stage-Age correspond to late Brunhes, and Ensenadan Stage-Age sediments correspond to Matuyama and early Brunhes. In the surrounding areas of LP, sediments of the Buenos Aires Formation would have a Brunhes magnetic age and Ensenada Formation predominantly Matuyama. In east central BA (Tandil), the Barker Formation (Montehermosan-Chapadmalalan Stages-Ages) was assigned to C3A, Gilbert, and Gauss Chrons, and Vela and Las Ánimas Formations (Lujanian Stage-Age) to Brunhes. Nearby, in the locality of Balcarce, the sediments include Matuyama (Ensenadan and Marplatan Stages-Ages) and Brunhes. On the other hand, in NW Argentina, province of Tucumán, magnetic ages correspond to Brunhes and Matuyama. To the SW of Tucumán, in the province of Catamarca, the fauna assigned to the Huayquerian, Montehermosan, and Chapadmalalan Stages-Ages, would span from “Chron 6” through Gilbert, in old terminology. In the northernmost tip of Argentina near Bolivia, in the Jujuy Province, the Uquía Formation was assigned to early-middle Matuyama to Gauss and, recently, in another section, to late Gilbert. In southern Bolivia, the Tarija Formation was dated as late Matuyama to Brunhes. Temporal correlation across southern South America using magnetostratigraphy poses challenges, which are discussed in this chapter.

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General Review of the Continental Late Cenozoic Magnetostratigraphy of Argentina

  • 章节

  • 发表日期：

    2026年

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  • Luiggina Cappellotto,
  • María Julia Orgeira,
  • Mauro Gomez Samus

摘要

This review examines the magnetostratigraphy and magnetic ages from the late Cenozoic in Argentina and southern Bolivia. In the province of Buenos Aires (BA), to the south, levels with fossil vertebrate fauna were assigned to different stage-ages and magnetic ages: Marplatan Stage-Age (early-mid to mid-late Gauss), Ensenadan Stage-Age (Matuyama and early Brunhes), and Lujanian Stage-Age (Brunhes). Other sections to the south of BA, with fauna assigned to the Marplatan Stage-Age, correspond to early Matuyama. To the E-SE, Gilbert magnetic ages were determined in Bahía Blanca, and Chasicó. In northern BA—including BA City—the studied section corresponds to Brunhes, Matuyama (Ensenadan Stage-Age), and late Gauss. In the city of La Plata (LP) toward the E, sediments assigned to the Bonaerean Stage-Age correspond to late Brunhes, and Ensenadan Stage-Age sediments correspond to Matuyama and early Brunhes. In the surrounding areas of LP, sediments of the Buenos Aires Formation would have a Brunhes magnetic age and Ensenada Formation predominantly Matuyama. In east central BA (Tandil), the Barker Formation (Montehermosan-Chapadmalalan Stages-Ages) was assigned to C3A, Gilbert, and Gauss Chrons, and Vela and Las Ánimas Formations (Lujanian Stage-Age) to Brunhes. Nearby, in the locality of Balcarce, the sediments include Matuyama (Ensenadan and Marplatan Stages-Ages) and Brunhes. On the other hand, in NW Argentina, province of Tucumán, magnetic ages correspond to Brunhes and Matuyama. To the SW of Tucumán, in the province of Catamarca, the fauna assigned to the Huayquerian, Montehermosan, and Chapadmalalan Stages-Ages, would span from “Chron 6” through Gilbert, in old terminology. In the northernmost tip of Argentina near Bolivia, in the Jujuy Province, the Uquía Formation was assigned to early-middle Matuyama to Gauss and, recently, in another section, to late Gilbert. In southern Bolivia, the Tarija Formation was dated as late Matuyama to Brunhes. Temporal correlation across southern South America using magnetostratigraphy poses challenges, which are discussed in this chapter.