Eos, Transactions American Geophysical Union, 1981
The ninth in a series of Caribbean Geological Conferences, which are held every 3 or 4 years, too... more The ninth in a series of Caribbean Geological Conferences, which are held every 3 or 4 years, took place in Santo Domingo, capital of the Dominican Republic, from the 15th to 26th of August 1980. The conference, which was sponsored by the government of the Dominican Republic and the Universidad Catolica Madre y Maestra, was preceded by 2 days of field trips and was opened by President Antonio Guzman on the evening of the 17th of August. Generous support was provided by Alcoa Exploration Co., Falconbridge Dominicana, and Rosario Dominicana.Geologists and geophysicists from 25 countries presented about 130 papers on a wide variety of topics ranging from geophysics to paleontology. While the whole Caribbean area was discussed, there was special emphasis on the northern Caribbean and Hispaniola, as befitted the site of the conference. The contribution of workers from the Dirección General de Mineriá was particularly notable.
Geological Society of America Special Papers, 1991
Page 1. (ATI С Co^B^G Geological Society of America Special Paper 262 1991 An overview of the geo... more Page 1. (ATI С Co^B^G Geological Society of America Special Paper 262 1991 An overview of the geologic and tectonic development ofHispaniola Paul Mann Institute for Geophysics, University of Texas at Austin, 8701 Mopac Boulevard, Austin, Texas 78759 Grenville Draper ...
Geological Society of America Special Papers, 1991
Page 1. (ATI С Co^B^G Geological Society of America Special Paper 262 1991 An overview of the geo... more Page 1. (ATI С Co^B^G Geological Society of America Special Paper 262 1991 An overview of the geologic and tectonic development ofHispaniola Paul Mann Institute for Geophysics, University of Texas at Austin, 8701 Mopac Boulevard, Austin, Texas 78759 Grenville Draper ...
Resum El sistema Cretácico Superior-Eoceno de arco-isla circum-caribeño (AICC) consiste en una ac... more Resum El sistema Cretácico Superior-Eoceno de arco-isla circum-caribeño (AICC) consiste en una acrección compleja de diversas unidades tectónicas o terrenos, los cuales han sido inicialmente formados y posteriormente acrecionados en un ambiente geodinámico intraoceánico desde el Jurásico Superior-Cretácico Inferior. En la Cordillera Central Dominicana estos terrenos están representados por varias unidades tectonoestratigráficas que definen un basamento deformado y metamorfizado de edad pre-Aptiense/Albiense, ...
La evolución tectonoestratigráfica del margen sur de la placa Norteamericana en México es materia... more La evolución tectonoestratigráfica del margen sur de la placa Norteamericana en México es materia de debate. Los escenarios recientemente propuestos muestran la acreción de terrenos oceánicos durante el Campaniano-Eoceno. Aquí presentamos nuevos resultados del mapeo a escala 1:100,000 de un transecto de 30 x 250 km en el norte del estado de Guerrero, de Huetamo, Michoacán de Papalutla, Guerrero. Nuestro objetivo al mapear esta región fue caracterizar los límites de terrenos que han sido propuestos a lo largo de este transecto y el análisis de su evolución tectonoestratigráfica. Nuestro mapa, sección estructural y análisis de la sección estratigráfica de 9 km de espesor, son consistentes con información regional. En el área mapeada se desarrolló una cuenca Jurásica-Cretácica temprana (de retro-arco?)en la cual se depositaron rocas volcánicas submarinas predominantemente andesíticas y sedimentarias, sobre un basamento continental Pérmico tardío-Triásico temprano. Una transgresión Apti...
ABSTRACT Ultrahigh-pressure (UHP) rocks in the Cuaba Gneiss include Grt ultramafic rocks, mafic e... more ABSTRACT Ultrahigh-pressure (UHP) rocks in the Cuaba Gneiss include Grt ultramafic rocks, mafic eclogite, and partially retrograded equivalents. The Grt ultramafic rocks (Spl-bearing Grt peridotite, Splbearing Grt clinopyroxenite, Crn-Spl-bearing Grt clinopyroxenite) are of igneous origin, with magmatic conditions of P > 3.5 GPa, T > 1550°C. The magmatic history took place in the asthenosphere. New chemical analyses of minerals give the following subsolidus conditions: Grt peridotite, 3.0-4.2 GPa, 838-867°C; Grt clinopyroxenite (Grt + Cpx + Spl + Crn), 2.75 GPa, 807°C. The ultramafic rocks are associated with partially retrograded eclogite, interpreted as deep-subducted oceanic crust. New chemical analyses of minerals in the eclogite give conditions that relate to the retrograde decomposition of Grt + Omp + Qtz to Grt + Pl + Di + Qtz, 1.8 GPa, 730°C.The P-T path for the Grt ultramafic rocks is modeled in three parts: (1) slow, isobaric (> 4 GPa) cooling in the mantle, >1550°C down to ∼850°C; (2) relatively rapid, nearly adiabatic (?) decompression, ∼4 GPa (∼850°C) down to ∼1 GPa (∼700°C); and (3) relatively rapid, non-adiabatic decompression and cooling. The first part of the path (1) took place in the mantle above the subduction zone and relates to delivery of the Grt ultramafic rocks to the subduction zone. Incorporation of Grt ultramafic rocks in the deep-subducted oceanic crust (eclogite) marked the end of this part of the path. The second part of the path (2) was associated with transport up the subduction zone. Retrograde P-T conditions for the eclogite fall on this part of the path, supporting the idea that the Grt ultramafic rocks were transported as blocks in the eclogite. The third part of the path (3) relates to final uplift to the surface.
Ophiolitic rocks (associated basalts, gabbros and ultramafic rocks) occur in many areas in the ci... more Ophiolitic rocks (associated basalts, gabbros and ultramafic rocks) occur in many areas in the circum-Caribbean and Central America. These ophiolites are derived principally from two oceanic provinces: (1) the Atlantic realm, proto-Caribbean sea that formed when North America separated from South America during the opening of the North Atlantic during Jurassic and Early Cretaceous time. These ophiolites were emplaced during a series of late Cretaceous to early Tertiary arc-continent collisions as the east facing Antilles arc migrated into the Caribbean realm. These occurrences include Guatamala, northern Cuba, northern Hispaniola, and northern Venezuela. (2) the Pacific realm, late Cretaceous Caribbean-Colombian plateau that now occupies the central Caribbean, but outcrops on land in Costa Rica, SW Hispaniola, the Netherlands Antilles and western Colombia. Accretion, emplacement and uplift was aided by their buoyancy and took place at various times during the Caribbean plateau's...
Eos, Transactions American Geophysical Union, 1981
The ninth in a series of Caribbean Geological Conferences, which are held every 3 or 4 years, too... more The ninth in a series of Caribbean Geological Conferences, which are held every 3 or 4 years, took place in Santo Domingo, capital of the Dominican Republic, from the 15th to 26th of August 1980. The conference, which was sponsored by the government of the Dominican Republic and the Universidad Catolica Madre y Maestra, was preceded by 2 days of field trips and was opened by President Antonio Guzman on the evening of the 17th of August. Generous support was provided by Alcoa Exploration Co., Falconbridge Dominicana, and Rosario Dominicana.Geologists and geophysicists from 25 countries presented about 130 papers on a wide variety of topics ranging from geophysics to paleontology. While the whole Caribbean area was discussed, there was special emphasis on the northern Caribbean and Hispaniola, as befitted the site of the conference. The contribution of workers from the Dirección General de Mineriá was particularly notable.
Geological Society of America Special Papers, 1991
Page 1. (ATI С Co^B^G Geological Society of America Special Paper 262 1991 An overview of the geo... more Page 1. (ATI С Co^B^G Geological Society of America Special Paper 262 1991 An overview of the geologic and tectonic development ofHispaniola Paul Mann Institute for Geophysics, University of Texas at Austin, 8701 Mopac Boulevard, Austin, Texas 78759 Grenville Draper ...
Geological Society of America Special Papers, 1991
Page 1. (ATI С Co^B^G Geological Society of America Special Paper 262 1991 An overview of the geo... more Page 1. (ATI С Co^B^G Geological Society of America Special Paper 262 1991 An overview of the geologic and tectonic development ofHispaniola Paul Mann Institute for Geophysics, University of Texas at Austin, 8701 Mopac Boulevard, Austin, Texas 78759 Grenville Draper ...
Resum El sistema Cretácico Superior-Eoceno de arco-isla circum-caribeño (AICC) consiste en una ac... more Resum El sistema Cretácico Superior-Eoceno de arco-isla circum-caribeño (AICC) consiste en una acrección compleja de diversas unidades tectónicas o terrenos, los cuales han sido inicialmente formados y posteriormente acrecionados en un ambiente geodinámico intraoceánico desde el Jurásico Superior-Cretácico Inferior. En la Cordillera Central Dominicana estos terrenos están representados por varias unidades tectonoestratigráficas que definen un basamento deformado y metamorfizado de edad pre-Aptiense/Albiense, ...
La evolución tectonoestratigráfica del margen sur de la placa Norteamericana en México es materia... more La evolución tectonoestratigráfica del margen sur de la placa Norteamericana en México es materia de debate. Los escenarios recientemente propuestos muestran la acreción de terrenos oceánicos durante el Campaniano-Eoceno. Aquí presentamos nuevos resultados del mapeo a escala 1:100,000 de un transecto de 30 x 250 km en el norte del estado de Guerrero, de Huetamo, Michoacán de Papalutla, Guerrero. Nuestro objetivo al mapear esta región fue caracterizar los límites de terrenos que han sido propuestos a lo largo de este transecto y el análisis de su evolución tectonoestratigráfica. Nuestro mapa, sección estructural y análisis de la sección estratigráfica de 9 km de espesor, son consistentes con información regional. En el área mapeada se desarrolló una cuenca Jurásica-Cretácica temprana (de retro-arco?)en la cual se depositaron rocas volcánicas submarinas predominantemente andesíticas y sedimentarias, sobre un basamento continental Pérmico tardío-Triásico temprano. Una transgresión Apti...
ABSTRACT Ultrahigh-pressure (UHP) rocks in the Cuaba Gneiss include Grt ultramafic rocks, mafic e... more ABSTRACT Ultrahigh-pressure (UHP) rocks in the Cuaba Gneiss include Grt ultramafic rocks, mafic eclogite, and partially retrograded equivalents. The Grt ultramafic rocks (Spl-bearing Grt peridotite, Splbearing Grt clinopyroxenite, Crn-Spl-bearing Grt clinopyroxenite) are of igneous origin, with magmatic conditions of P > 3.5 GPa, T > 1550°C. The magmatic history took place in the asthenosphere. New chemical analyses of minerals give the following subsolidus conditions: Grt peridotite, 3.0-4.2 GPa, 838-867°C; Grt clinopyroxenite (Grt + Cpx + Spl + Crn), 2.75 GPa, 807°C. The ultramafic rocks are associated with partially retrograded eclogite, interpreted as deep-subducted oceanic crust. New chemical analyses of minerals in the eclogite give conditions that relate to the retrograde decomposition of Grt + Omp + Qtz to Grt + Pl + Di + Qtz, 1.8 GPa, 730°C.The P-T path for the Grt ultramafic rocks is modeled in three parts: (1) slow, isobaric (> 4 GPa) cooling in the mantle, >1550°C down to ∼850°C; (2) relatively rapid, nearly adiabatic (?) decompression, ∼4 GPa (∼850°C) down to ∼1 GPa (∼700°C); and (3) relatively rapid, non-adiabatic decompression and cooling. The first part of the path (1) took place in the mantle above the subduction zone and relates to delivery of the Grt ultramafic rocks to the subduction zone. Incorporation of Grt ultramafic rocks in the deep-subducted oceanic crust (eclogite) marked the end of this part of the path. The second part of the path (2) was associated with transport up the subduction zone. Retrograde P-T conditions for the eclogite fall on this part of the path, supporting the idea that the Grt ultramafic rocks were transported as blocks in the eclogite. The third part of the path (3) relates to final uplift to the surface.
Ophiolitic rocks (associated basalts, gabbros and ultramafic rocks) occur in many areas in the ci... more Ophiolitic rocks (associated basalts, gabbros and ultramafic rocks) occur in many areas in the circum-Caribbean and Central America. These ophiolites are derived principally from two oceanic provinces: (1) the Atlantic realm, proto-Caribbean sea that formed when North America separated from South America during the opening of the North Atlantic during Jurassic and Early Cretaceous time. These ophiolites were emplaced during a series of late Cretaceous to early Tertiary arc-continent collisions as the east facing Antilles arc migrated into the Caribbean realm. These occurrences include Guatamala, northern Cuba, northern Hispaniola, and northern Venezuela. (2) the Pacific realm, late Cretaceous Caribbean-Colombian plateau that now occupies the central Caribbean, but outcrops on land in Costa Rica, SW Hispaniola, the Netherlands Antilles and western Colombia. Accretion, emplacement and uplift was aided by their buoyancy and took place at various times during the Caribbean plateau's...
Uploads
Papers by Gren Draper