Active rifting and crustal thinning along the Rivera-Cocos plate boundary as inferred from Mantle Bouguer gravity anomalies
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| Natura: | Artículo científico |
| Lingua: | en |
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Universidad Nacional Autónoma de México
2004
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| _version_ | 1876424849843290112 |
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| author | Gloria S. Serrato Díaz |
| author_facet | Gloria S. Serrato Díaz |
| contents | Active rifting and crustal thinning along the Rivera-Cocos plate boundary as inferred from Mantle Bouguer gravity anomalies Gloria S. Serrato Díaz Carlos A. Mortera Gutiérrez William L. Bandy Ciencias de la Tierra Mantle gravity Bouguer Plate tectonics east Pacific ocean The El Gordo graben lies within the oceanic lithosphere west of the Middle America Trench at 18.15°N, 104.7°W. Thisgraben has been proposed to mark the southwest tip of an active zone of extension located between the Rivera and Cocos plates.The results of an analysis of the Mantle Bouguer gravity anomalies in the area of the El Gordo graben, and in the area locatedbetween the graben and the East Pacific Rise, are consistent with this proposal, as well as the proposal that the zone of extensionmay be propagating towards the East Pacific Rise. Specifically: (1) A prominent decrease in the MBA values occurs in the area ofthe El Gordo graben, the maximum decrease being centered over the El Gordo volcanic complex, located in the center of thegraben. This decrease is modeled as being the result of magma intrusion within the oceanic crust of the graben centered under theEl Gordo volcanic complex. This model is supported by high surface heat flow in the area of this complex. (2) A NE-SW free-airgravity high is observed to extend from the El Gordo graben to the East Pacific Rise. However, only the western part of thisanomaly is observed in the MBA map. Modeling of the MBA values indicate that this anomaly may be due to crustal thinning inthis region. However, unlike the area of the El Gordo graben, gravity and bathymetric data is sparse in this area, so this resultshould be considered as preliminary. 2004 artículo científico 0016-7169 https://www.redalyc.org/articulo.oa?id=56843304 en http://www.redalyc.org/revista.oa?id=568 Geofísica Internacional application/pdf Universidad Nacional Autónoma de México Geofísica Internacional (México) Num.3 Vol.43 |
| format | Artículo científico |
| id | redalyc_56843304 |
| institution | Redalyc |
| language | en |
| publishDate | 2004 |
| publisher | Universidad Nacional Autónoma de México |
| spellingShingle | Active rifting and crustal thinning along the Rivera-Cocos plate boundary as inferred from Mantle Bouguer gravity anomalies Gloria S. Serrato Díaz Ciencias de la Tierra Mantle gravity Bouguer Plate tectonics east Pacific ocean Active rifting and crustal thinning along the Rivera-Cocos plate boundary as inferred from Mantle Bouguer gravity anomalies Gloria S. Serrato Díaz Carlos A. Mortera Gutiérrez William L. Bandy Ciencias de la Tierra Mantle gravity Bouguer Plate tectonics east Pacific ocean The El Gordo graben lies within the oceanic lithosphere west of the Middle America Trench at 18.15°N, 104.7°W. Thisgraben has been proposed to mark the southwest tip of an active zone of extension located between the Rivera and Cocos plates.The results of an analysis of the Mantle Bouguer gravity anomalies in the area of the El Gordo graben, and in the area locatedbetween the graben and the East Pacific Rise, are consistent with this proposal, as well as the proposal that the zone of extensionmay be propagating towards the East Pacific Rise. Specifically: (1) A prominent decrease in the MBA values occurs in the area ofthe El Gordo graben, the maximum decrease being centered over the El Gordo volcanic complex, located in the center of thegraben. This decrease is modeled as being the result of magma intrusion within the oceanic crust of the graben centered under theEl Gordo volcanic complex. This model is supported by high surface heat flow in the area of this complex. (2) A NE-SW free-airgravity high is observed to extend from the El Gordo graben to the East Pacific Rise. However, only the western part of thisanomaly is observed in the MBA map. Modeling of the MBA values indicate that this anomaly may be due to crustal thinning inthis region. However, unlike the area of the El Gordo graben, gravity and bathymetric data is sparse in this area, so this resultshould be considered as preliminary. 2004 artículo científico 0016-7169 https://www.redalyc.org/articulo.oa?id=56843304 en http://www.redalyc.org/revista.oa?id=568 Geofísica Internacional application/pdf Universidad Nacional Autónoma de México Geofísica Internacional (México) Num.3 Vol.43 |
| title | Active rifting and crustal thinning along the Rivera-Cocos plate boundary as inferred from Mantle Bouguer gravity anomalies |
| topic | Ciencias de la Tierra Mantle gravity Bouguer Plate tectonics east Pacific ocean |
| url | https://www.redalyc.org/articulo.oa?id=56843304 |