Coastal evolution from transgressive barrier deposit to marine terrace on Isla Coronados, Baja California Sur, Mexico
This contribution describes and discusses the development of the Isla Coronados Pleistocene coastal deposits. The south side of the 700,000–160,000 year-old volcanic cone on Isla Coronados (Baja California Sur, Mexico) forms a shelf that converges on older Miocene andesite from the Comondú Group. L...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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Universidad Autónoma de Baja California
2007-12-01
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| Series: | Ciencias Marinas |
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| Online Access: | https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/1108 |
| _version_ | 1797279461144526848 |
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| author | J Ledesma-Vazquez ME Johnson DH Backus C Mirabal-Davila |
| author_facet | J Ledesma-Vazquez ME Johnson DH Backus C Mirabal-Davila |
| author_sort | J Ledesma-Vazquez |
| collection | DOAJ |
| description |
This contribution describes and discusses the development of the Isla Coronados Pleistocene coastal deposits. The south side of the 700,000–160,000 year-old volcanic cone on Isla Coronados (Baja California Sur, Mexico) forms a shelf that converges on older Miocene andesite from the Comondú Group. Later Pleistocene carbonates accumulated on and around the antecedent topography as related by stratigraphic sections strategically located with respect to small andesite islets that formed a fixed barrier along the outer margin of a large lagoon at the foot of the volcano. Distinct facies show the progressive foundering on the island and the infilling of the lagoon about 121,000 years ago during events correlated with marine isotope substage 5e. On the seaward side of the barrier, a basal conglomerate of andesite boulders and cobbles grades into limestone with a diverse shelly fauna and whole rhodoliths in a matrix of rhodolith sand. Similar limestone is found on the lagoon side of the barrier, but features the bivalve Pina corteziana from a sheltered environment. Other facies are represented by populations of the coral Porites panamensis at different levels of growth and integration. Biocalcarenite derived from the debris of crushed rhodoliths occurs as the most extensive facies in terms of area and thickness. Sheeted layers that dip 20º off the top of the islets toward the volcano are regarded as washover deposits typical of barrier systems. A cobble pavement, interpreted as a ravinement surface, marks a widespread unconformity at the top of the biocalcarenite. This surface was the foundation for a short-lived rocky-shore biota in transition to dense growth of branching P. panamensis. The sequence ends with a thin marine terrace deposit that buried the coral thickets at the present 12-m level.
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| first_indexed | 2024-03-07T16:25:41Z |
| format | Article |
| id | doaj.art-5cef317f9b6d49258f362294a313f558 |
| institution | Directory Open Access Journal |
| issn | 0185-3880 2395-9053 |
| language | English |
| last_indexed | 2024-03-07T16:25:41Z |
| publishDate | 2007-12-01 |
| publisher | Universidad Autónoma de Baja California |
| record_format | Article |
| series | Ciencias Marinas |
| spelling | doaj.art-5cef317f9b6d49258f362294a313f5582024-03-03T18:18:14ZengUniversidad Autónoma de Baja CaliforniaCiencias Marinas0185-38802395-90532007-12-0133410.7773/cm.v33i4.1108Coastal evolution from transgressive barrier deposit to marine terrace on Isla Coronados, Baja California Sur, MexicoJ Ledesma-Vazquez0ME Johnson1DH Backus2C Mirabal-Davila3Universidad Autónoma de Baja CaliforniaWilliams CollegeWilliams CollegeUniversidad Autónoma de Baja California This contribution describes and discusses the development of the Isla Coronados Pleistocene coastal deposits. The south side of the 700,000–160,000 year-old volcanic cone on Isla Coronados (Baja California Sur, Mexico) forms a shelf that converges on older Miocene andesite from the Comondú Group. Later Pleistocene carbonates accumulated on and around the antecedent topography as related by stratigraphic sections strategically located with respect to small andesite islets that formed a fixed barrier along the outer margin of a large lagoon at the foot of the volcano. Distinct facies show the progressive foundering on the island and the infilling of the lagoon about 121,000 years ago during events correlated with marine isotope substage 5e. On the seaward side of the barrier, a basal conglomerate of andesite boulders and cobbles grades into limestone with a diverse shelly fauna and whole rhodoliths in a matrix of rhodolith sand. Similar limestone is found on the lagoon side of the barrier, but features the bivalve Pina corteziana from a sheltered environment. Other facies are represented by populations of the coral Porites panamensis at different levels of growth and integration. Biocalcarenite derived from the debris of crushed rhodoliths occurs as the most extensive facies in terms of area and thickness. Sheeted layers that dip 20º off the top of the islets toward the volcano are regarded as washover deposits typical of barrier systems. A cobble pavement, interpreted as a ravinement surface, marks a widespread unconformity at the top of the biocalcarenite. This surface was the foundation for a short-lived rocky-shore biota in transition to dense growth of branching P. panamensis. The sequence ends with a thin marine terrace deposit that buried the coral thickets at the present 12-m level. https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/1108barrier-island systemPleistocenetransgressiveoverwash fan |
| spellingShingle | J Ledesma-Vazquez ME Johnson DH Backus C Mirabal-Davila Coastal evolution from transgressive barrier deposit to marine terrace on Isla Coronados, Baja California Sur, Mexico Ciencias Marinas barrier-island system Pleistocene transgressive overwash fan |
| title | Coastal evolution from transgressive barrier deposit to marine terrace on Isla Coronados, Baja California Sur, Mexico |
| title_full | Coastal evolution from transgressive barrier deposit to marine terrace on Isla Coronados, Baja California Sur, Mexico |
| title_fullStr | Coastal evolution from transgressive barrier deposit to marine terrace on Isla Coronados, Baja California Sur, Mexico |
| title_full_unstemmed | Coastal evolution from transgressive barrier deposit to marine terrace on Isla Coronados, Baja California Sur, Mexico |
| title_short | Coastal evolution from transgressive barrier deposit to marine terrace on Isla Coronados, Baja California Sur, Mexico |
| title_sort | coastal evolution from transgressive barrier deposit to marine terrace on isla coronados baja california sur mexico |
| topic | barrier-island system Pleistocene transgressive overwash fan |
| url | https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/1108 |
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