A gap in the Pliocene invasion of seawater to the Gulf of California
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| Format: | Artículo científico |
| Sprache: | es |
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Universidad Nacional Autónoma de México
2002
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| _version_ | 1876472619797053440 |
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| author | Jorge Ledesma Vázquez |
| author_facet | Jorge Ledesma Vázquez |
| contents | A gap in the Pliocene invasion of seawater to the Gulf of California Jorge Ledesma Vázquez Ciencias de la Tierra Pliocene half graben Gulf of California extensional basins The Proto-Gulf extensional province was formed during the Miocene, from 14 to 12 Ma.During the main extensional period, within the Baja California central domain, several depocenterswere formed including the El Boleo basin, followed to the south by the Bahía Concepción basin, andto the southeast, the San Nicolás basin. The San Nicolás basin is associated with the transfer zonecoupled to the Bahía Concepción accommodation zone. The Miocene extensional process resulted inthe uplift and exhumation of the regional Cretaceous granodiorite basement in the Concepciónpeninsula, Punta San Antonio, and San Juan Londó valley. The episode of extension is responsiblefor the tilting of volcanic blocks of Miocene age. The late Pliocene San Nicolás Formation is alithostratigraphic unit with three sedimentary members. Most of the sedimentary units in the SanNicolás Formation reflect a post-extensional episode that involved rapid initial subsidence, reactivationassociated with low rates of sedimentation, followed by periods of shallow water depositiondominated by storm activity, and the presence of large scale sand wave deposits which delineateextreme tidal conditions. The maximum age assigned to the San Nicolás Formation is 3.3 ± 0.5 Ma.In contrast, at Punta Chivato, and in the Bahía Concepción area, all the marine units areassigned to the lower Pliocene San Marcos Formation, and upper Pliocene Marquer Formation.Here, the marine strata reflect a post-extensional episode that involved low rates of subsidence,associated with moderate rates of sedimentation followed by periods of shallow water depositiondominated by very low energy. These relationships suggest that during the late Pliocene, the interconnectionbetween the Proto-Gulf and the Gulf of California was not completed, and the head of thedeveloping modern Gulf of California was near the San Nicolás basin during the late Pliocene,clearly associated with the transtensional regime responsible for the present tectonic configurationin the Gulf of California 2002 artículo científico 1026-8774 https://www.redalyc.org/articulo.oa?id=57219301 es http://www.redalyc.org/revista.oa?id=572 Revista Mexicana de Ciencias Geológicas application/pdf Universidad Nacional Autónoma de México Revista Mexicana de Ciencias Geológicas (México) Num.3 Vol.19 |
| format | Artículo científico |
| id | redalyc_57219301 |
| institution | Redalyc |
| language | es |
| publishDate | 2002 |
| publisher | Universidad Nacional Autónoma de México |
| spellingShingle | A gap in the Pliocene invasion of seawater to the Gulf of California Jorge Ledesma Vázquez Ciencias de la Tierra Pliocene half graben Gulf of California extensional basins A gap in the Pliocene invasion of seawater to the Gulf of California Jorge Ledesma Vázquez Ciencias de la Tierra Pliocene half graben Gulf of California extensional basins The Proto-Gulf extensional province was formed during the Miocene, from 14 to 12 Ma.During the main extensional period, within the Baja California central domain, several depocenterswere formed including the El Boleo basin, followed to the south by the Bahía Concepción basin, andto the southeast, the San Nicolás basin. The San Nicolás basin is associated with the transfer zonecoupled to the Bahía Concepción accommodation zone. The Miocene extensional process resulted inthe uplift and exhumation of the regional Cretaceous granodiorite basement in the Concepciónpeninsula, Punta San Antonio, and San Juan Londó valley. The episode of extension is responsiblefor the tilting of volcanic blocks of Miocene age. The late Pliocene San Nicolás Formation is alithostratigraphic unit with three sedimentary members. Most of the sedimentary units in the SanNicolás Formation reflect a post-extensional episode that involved rapid initial subsidence, reactivationassociated with low rates of sedimentation, followed by periods of shallow water depositiondominated by storm activity, and the presence of large scale sand wave deposits which delineateextreme tidal conditions. The maximum age assigned to the San Nicolás Formation is 3.3 ± 0.5 Ma.In contrast, at Punta Chivato, and in the Bahía Concepción area, all the marine units areassigned to the lower Pliocene San Marcos Formation, and upper Pliocene Marquer Formation.Here, the marine strata reflect a post-extensional episode that involved low rates of subsidence,associated with moderate rates of sedimentation followed by periods of shallow water depositiondominated by very low energy. These relationships suggest that during the late Pliocene, the interconnectionbetween the Proto-Gulf and the Gulf of California was not completed, and the head of thedeveloping modern Gulf of California was near the San Nicolás basin during the late Pliocene,clearly associated with the transtensional regime responsible for the present tectonic configurationin the Gulf of California 2002 artículo científico 1026-8774 https://www.redalyc.org/articulo.oa?id=57219301 es http://www.redalyc.org/revista.oa?id=572 Revista Mexicana de Ciencias Geológicas application/pdf Universidad Nacional Autónoma de México Revista Mexicana de Ciencias Geológicas (México) Num.3 Vol.19 |
| title | A gap in the Pliocene invasion of seawater to the Gulf of California |
| topic | Ciencias de la Tierra Pliocene half graben Gulf of California extensional basins |
| url | https://www.redalyc.org/articulo.oa?id=57219301 |