About: Noreán Formation

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dbo:abstract	The Noreán Formation (Spanish: Formación Noreán, J1-2n, J1n) is a geological formation of the Eastern Ranges of the Colombian Andes, the Serranía de San Lucas and as basement underlying the southernmost and northern Middle Magdalena Valleys. The formation consists of volcanic and pyroclastic lavas that range from andesites to rhyolites. Vitric, lithic and crystal tuffs and andesitic dikes and hypabyssal bodies are also present in the formation. The more than 2,000 metres (6,600 ft) thick formation was deposited in a continental arc magmatic setting in an Early Jurassic graben that presently forms the basement of the Middle Magdalena Valley (VMM). A positive anomaly of Pb suggests a subduction-related genesis dominated by explosive volcanism. (en)
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dbp:age	dbr:Sinemurian dbr:Toarcian
dbp:caption	Outcrop of the Effusive Rhyolitic Unit south of Pailitas, Cesar (en)
dbp:extent	dbr:Cordillera_Oriental_(Colombia) dbr:Andes dbr:Middle_Magdalena_Valley dbr:Serranía_de_San_Lucas dbr:Lower_Magdalena_Valley
dbp:locationTs	dbr:Aguachica
dbp:mapCaption	200 (xsd:integer) Paleogeography of Northern South America (en)
dbp:name	Noreán Formation (en)
dbp:namedby	Clavijo (en)
dbp:namedfor	Caserío Noreán (en)
dbp:otherlithology	Ignimbrites, thin sandstones (en)
dbp:overlies	dbr:Bucaramanga_Gneiss dbr:Norosí_Batholith dbr:San_Lucas_Gneiss Bocas, Morrocoyal & Sudán Formations (en)
dbp:period	Early Jurassic (en)
dbp:prilithology	Andesitic-rhyolitic lavas & pyroclastics (en)
dbp:region	dbr:Santander_Department dbr:Bolívar_Department dbr:Cesar_Department
dbp:regionTs	dbr:Cesar_Department
dbp:subunits	dbr:Noreán_Formation
dbp:type	dbr:Geological_formation
dbp:underlies	Tablazo & La Luna Formations (en)
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dbp:yearTs	1995 (xsd:integer)
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georss:point	8.0 -74.0
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rdfs:comment	The Noreán Formation (Spanish: Formación Noreán, J1-2n, J1n) is a geological formation of the Eastern Ranges of the Colombian Andes, the Serranía de San Lucas and as basement underlying the southernmost and northern Middle Magdalena Valleys. The formation consists of volcanic and pyroclastic lavas that range from andesites to rhyolites. Vitric, lithic and crystal tuffs and andesitic dikes and hypabyssal bodies are also present in the formation. (en)
rdfs:label	Noreán Formation (en)
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