INGEOSUR   20376
INSTITUTO GEOLOGICO DEL SUR
Unidad Ejecutora - UE
artículos
Título:
The Cordon del Portillo Permian magmatism, Mendoza, Argentina, plutonic and
Autor/es:
DANIEL ALFREDO GREGORI; BENEDINI, L
Revista:
JOURNAL OF SOUTH AMERICAN EARTH SCIENCES
Editorial:
PERGAMON-ELSEVIER SCIENCE LTD
Referencias:
Lugar: Amsterdam; Año: 2012
ISSN:
0895-9811
Resumen:
The Cerro Punta Blanca, Cerro Bayo and Cerro Punta Negra stocks, parts of the Cordillera Frontal
Composite Batholith, cropping out in the Cordón del Portillo, records the Gondwana magmatic
development of the Cordillera Frontal of Mendoza, in western Argentina. In this area, the San Rafael
Orogenic phase, that represents the closure of the Late CarboniferouseEarly Permian marine basins,
begins at 284 Ma, and ceased before 276 Ma. The Cerro Punta Blanca, Cerro Bayo and Cerro Punta Negra
stocks represent a post-orogenic magmatism and are equivalents to the Choiyoi Group. The Gondwana
magmatic activity in the Cordón del Portillo area can be divided into two stages. The Cerro Punta Blanca
stock (c.a. 276 Ma) represents an early post-orogenic, subduction-related magmatism similar to the
basic-intermediate section of the Choiyoi Group (c.a. 277 Ma). The late post-orogenic second event was
recorded by the Cerro Bayo (262 Ma) and Cerro Punta Negra stocks which represent a transition between
subduction-related and intra-plate magmatism. This event represents the intrusive counterpart of the
acidic facies of the upper section of the Choiyoi Group (c.a. 273 Ma). This extensional condition continued
during the Triassic when the Cacheuta basin developed.
recorded by the Cerro Bayo (262 Ma) and Cerro Punta Negra stocks which represent a transition between
subduction-related and intra-plate magmatism. This event represents the intrusive counterpart of the
acidic facies of the upper section of the Choiyoi Group (c.a. 273 Ma). This extensional condition continued
during the Triassic when the Cacheuta basin developed.
basic-intermediate section of the Choiyoi Group (c.a. 277 Ma). The late post-orogenic second event was
recorded by the Cerro Bayo (262 Ma) and Cerro Punta Negra stocks which represent a transition between
subduction-related and intra-plate magmatism. This event represents the intrusive counterpart of the
acidic facies of the upper section of the Choiyoi Group (c.a. 273 Ma). This extensional condition continued
during the Triassic when the Cacheuta basin developed.
recorded by the Cerro Bayo (262 Ma) and Cerro Punta Negra stocks which represent a transition between
subduction-related and intra-plate magmatism. This event represents the intrusive counterpart of the
acidic facies of the upper section of the Choiyoi Group (c.a. 273 Ma). This extensional condition continued
during the Triassic when the Cacheuta basin developed.
begins at 284 Ma, and ceased before 276 Ma. The Cerro Punta Blanca, Cerro Bayo and Cerro Punta Negra
stocks represent a post-orogenic magmatism and are equivalents to the Choiyoi Group. The Gondwana
magmatic activity in the Cordón del Portillo area can be divided into two stages. The Cerro Punta Blanca
stock (c.a. 276 Ma) represents an early post-orogenic, subduction-related magmatism similar to the
basic-intermediate section of the Choiyoi Group (c.a. 277 Ma). The late post-orogenic second event was
recorded by the Cerro Bayo (262 Ma) and Cerro Punta Negra stocks which represent a transition between
subduction-related and intra-plate magmatism. This event represents the intrusive counterpart of the
acidic facies of the upper section of the Choiyoi Group (c.a. 273 Ma). This extensional condition continued
during the Triassic when the Cacheuta basin developed.
recorded by the Cerro Bayo (262 Ma) and Cerro Punta Negra stocks which represent a transition between
subduction-related and intra-plate magmatism. This event represents the intrusive counterpart of the
acidic facies of the upper section of the Choiyoi Group (c.a. 273 Ma). This extensional condition continued
during the Triassic when the Cacheuta basin developed.
basic-intermediate section of the Choiyoi Group (c.a. 277 Ma). The late post-orogenic second event was
recorded by the Cerro Bayo (262 Ma) and Cerro Punta Negra stocks which represent a transition between
subduction-related and intra-plate magmatism. This event represents the intrusive counterpart of the
acidic facies of the upper section of the Choiyoi Group (c.a. 273 Ma). This extensional condition continued
during the Triassic when the Cacheuta basin developed.
recorded by the Cerro Bayo (262 Ma) and Cerro Punta Negra stocks which represent a transition between
subduction-related and intra-plate magmatism. This event represents the intrusive counterpart of the
acidic facies of the upper section of the Choiyoi Group (c.a. 273 Ma). This extensional condition continued
during the Triassic when the Cacheuta basin developed.
eEarly Permian marine basins,
begins at 284 Ma, and ceased before 276 Ma. The Cerro Punta Blanca, Cerro Bayo and Cerro Punta Negra
stocks represent a post-orogenic magmatism and are equivalents to the Choiyoi Group. The Gondwana
magmatic activity in the Cordón del Portillo area can be divided into two stages. The Cerro Punta Blanca
stock (c.a. 276 Ma) represents an early post-orogenic, subduction-related magmatism similar to the
basic-intermediate section of the Choiyoi Group (c.a. 277 Ma). The late post-orogenic second event was
recorded by the Cerro Bayo (262 Ma) and Cerro Punta Negra stocks which represent a transition between
subduction-related and intra-plate magmatism. This event represents the intrusive counterpart of the
acidic facies of the upper section of the Choiyoi Group (c.a. 273 Ma). This extensional condition continued
during the Triassic when the Cacheuta basin developed.
recorded by the Cerro Bayo (262 Ma) and Cerro Punta Negra stocks which represent a transition between
subduction-related and intra-plate magmatism. This event represents the intrusive counterpart of the
acidic facies of the upper section of the Choiyoi Group (c.a. 273 Ma). This extensional condition continued
during the Triassic when the Cacheuta basin developed.
basic-intermediate section of the Choiyoi Group (c.a. 277 Ma). The late post-orogenic second event was
recorded by the Cerro Bayo (262 Ma) and Cerro Punta Negra stocks which represent a transition between
subduction-related and intra-plate magmatism. This event represents the intrusive counterpart of the
acidic facies of the upper section of the Choiyoi Group (c.a. 273 Ma). This extensional condition continued
during the Triassic when the Cacheuta basin developed.
recorded by the Cerro Bayo (262 Ma) and Cerro Punta Negra stocks which represent a transition between
subduction-related and intra-plate magmatism. This event represents the intrusive counterpart of the
acidic facies of the upper section of the Choiyoi Group (c.a. 273 Ma). This extensional condition continued
during the Triassic when the Cacheuta basin developed.
c.a. 276 Ma) represents an early post-orogenic, subduction-related magmatism similar to the
basic-intermediate section of the Choiyoi Group (c.a. 277 Ma). The late post-orogenic second event was
recorded by the Cerro Bayo (262 Ma) and Cerro Punta Negra stocks which represent a transition between
subduction-related and intra-plate magmatism. This event represents the intrusive counterpart of the
acidic facies of the upper section of the Choiyoi Group (c.a. 273 Ma). This extensional condition continued
during the Triassic when the Cacheuta basin developed.
recorded by the Cerro Bayo (262 Ma) and Cerro Punta Negra stocks which represent a transition between
subduction-related and intra-plate magmatism. This event represents the intrusive counterpart of the
acidic facies of the upper section of the Choiyoi Group (c.a. 273 Ma). This extensional condition continued
during the Triassic when the Cacheuta basin developed.
c.a. 277 Ma). The late post-orogenic second event was
recorded by the Cerro Bayo (262 Ma) and Cerro Punta Negra stocks which represent a transition between
subduction-related and intra-plate magmatism. This event represents the intrusive counterpart of the
acidic facies of the upper section of the Choiyoi Group (c.a. 273 Ma). This extensional condition continued
during the Triassic when the Cacheuta basin developed.