Field report: Sailing around the exhumed roots of the Mesozoic Patagonian paleo-accretionary wedge (Diego de Almagro Island, Chile)
We undertook a boat expedition to explore the geological framework of a very remote, lesser-known island, in the Chilean Patagonia: the Diego de Almagro Island (latitude S51°33′). This uninhabited, ca. 400 km2 Island is one of the very rare exposures of the Mesozoic accretionary subduction complex a...
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| Format: | Article |
| Language: | English |
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Elsevier
2018-09-01
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| Series: | Geoscience Frontiers |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S1674987118301051 |
| _version_ | 1797714799355756544 |
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| author | Samuel Angiboust Jesus Muñoz |
| author_facet | Samuel Angiboust Jesus Muñoz |
| author_sort | Samuel Angiboust |
| collection | DOAJ |
| description | We undertook a boat expedition to explore the geological framework of a very remote, lesser-known island, in the Chilean Patagonia: the Diego de Almagro Island (latitude S51°33′). This uninhabited, ca. 400 km2 Island is one of the very rare exposures of the Mesozoic accretionary subduction complex along the Chilean margin. Unstable weather, strong winds, steep topography, and very dense vegetation make an on-land mission difficult. Careful preparation based on high-resolution satellite images is advised to optimize shore access and minimize risks of injury. Despite a relatively important degree of regional re-equilibration of metamorphic assemblages due to sluggish exhumation through the forearc crust, our results have shown that the island is composed of a nappe stack of ocean-floor derived slivers of meta-sedimentary units that exhibit very different pressure-temperature-time paths during burial by subduction under the Chilean margin and subsequent exhumation. These rocks are witness to a complex thermal evolution of the subduction zone between Jurassic and Cretaceous times from granulite facies to blueschist facies conditions as well as multiple episodes of accretion at ca. 35–40 km in depth for almost 100 Ma over the Mesozoic era. Keywords: Patagonia, Accretionary wedge, Blueschists, Subduction, Chile |
| first_indexed | 2024-03-12T07:57:14Z |
| format | Article |
| id | doaj.art-cec2d2657fd24c7292b5ad29e4b15af2 |
| institution | Directory Open Access Journal |
| issn | 1674-9871 |
| language | English |
| last_indexed | 2024-03-12T07:57:14Z |
| publishDate | 2018-09-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Geoscience Frontiers |
| spelling | doaj.art-cec2d2657fd24c7292b5ad29e4b15af22023-09-02T20:07:07ZengElsevierGeoscience Frontiers1674-98712018-09-019515911594Field report: Sailing around the exhumed roots of the Mesozoic Patagonian paleo-accretionary wedge (Diego de Almagro Island, Chile)Samuel Angiboust0Jesus Muñoz1Corresponding author. Institut de Physique du Globe de Paris, Sorbonne Paris Cité, University Paris Diderot, CNRS, F-75005, Paris, France.; Institut de Physique du Globe de Paris, Sorbonne Paris Cité, University Paris Diderot, CNRS, F-75005, Paris, France; GFZ German Research Centre for Geosciences, D-14473, Potsdam, GermanyInstitut de Physique du Globe de Paris, Sorbonne Paris Cité, University Paris Diderot, CNRS, F-75005, Paris, France; Carrera de Geología, Universidad Andres Bello, Sazie, 2119, Santiago, ChileWe undertook a boat expedition to explore the geological framework of a very remote, lesser-known island, in the Chilean Patagonia: the Diego de Almagro Island (latitude S51°33′). This uninhabited, ca. 400 km2 Island is one of the very rare exposures of the Mesozoic accretionary subduction complex along the Chilean margin. Unstable weather, strong winds, steep topography, and very dense vegetation make an on-land mission difficult. Careful preparation based on high-resolution satellite images is advised to optimize shore access and minimize risks of injury. Despite a relatively important degree of regional re-equilibration of metamorphic assemblages due to sluggish exhumation through the forearc crust, our results have shown that the island is composed of a nappe stack of ocean-floor derived slivers of meta-sedimentary units that exhibit very different pressure-temperature-time paths during burial by subduction under the Chilean margin and subsequent exhumation. These rocks are witness to a complex thermal evolution of the subduction zone between Jurassic and Cretaceous times from granulite facies to blueschist facies conditions as well as multiple episodes of accretion at ca. 35–40 km in depth for almost 100 Ma over the Mesozoic era. Keywords: Patagonia, Accretionary wedge, Blueschists, Subduction, Chilehttp://www.sciencedirect.com/science/article/pii/S1674987118301051 |
| spellingShingle | Samuel Angiboust Jesus Muñoz Field report: Sailing around the exhumed roots of the Mesozoic Patagonian paleo-accretionary wedge (Diego de Almagro Island, Chile) Geoscience Frontiers |
| title | Field report: Sailing around the exhumed roots of the Mesozoic Patagonian paleo-accretionary wedge (Diego de Almagro Island, Chile) |
| title_full | Field report: Sailing around the exhumed roots of the Mesozoic Patagonian paleo-accretionary wedge (Diego de Almagro Island, Chile) |
| title_fullStr | Field report: Sailing around the exhumed roots of the Mesozoic Patagonian paleo-accretionary wedge (Diego de Almagro Island, Chile) |
| title_full_unstemmed | Field report: Sailing around the exhumed roots of the Mesozoic Patagonian paleo-accretionary wedge (Diego de Almagro Island, Chile) |
| title_short | Field report: Sailing around the exhumed roots of the Mesozoic Patagonian paleo-accretionary wedge (Diego de Almagro Island, Chile) |
| title_sort | field report sailing around the exhumed roots of the mesozoic patagonian paleo accretionary wedge diego de almagro island chile |
| url | http://www.sciencedirect.com/science/article/pii/S1674987118301051 |
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