Volcanic dykes in the north Chilean Coast Range

Pichowiak, S.; Breitkreuz, Christoph

doi:10.1007/bf01820878

Cited by 7 publications

(2 citation statements)

References 18 publications

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“…Additional studies have been done on their secondary alteration and associated copper mineralization by Losert (1973) and their petrography and geochemistry by Palacios (1978). Pichowiak and Breitkreuz (1984) suggested that dike rocks in the La Negra Formation have withinplate geochemical affinities and formed in an ensialic setting.…”

Section: Previous Workmentioning

confidence: 98%

See 1 more Smart Citation

Magmatic activity and tectonic setting of the early stages of the Andean cycle in northern Chile

Pichowiak¹,

Buchelt²,

Damm³

1990

Geological Society of America Special Papers

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Jurassic and Lower Cretaceous magmatic activity in the present-day CoastalCordillera and the Central Depression of northern Chile is marked by important plutonic and volcanic cycles. The Initial Basics unit of the Coloso Coastal gabbro complex contains the first intrusives into an ensialic marginal basin related to extension, probably due to strike-slip plate motion. These gabbros have affinities with continental tholeiitic basalts. The subsequent Jurassic Volcanic unit, ranging from basalt to andesite in composition, erupted onto the subsiding basin. Simultaneous with and after the eruption of the Volcanic unit, the Late Granitoids unit was intruded. The earliest intrusives of this Late Granitoid unit (GI of the Coastal Cordillera) follow the Initial Basics in time and have similar geochemical source indicators. Geochemical signatures of both the Volcanic unit and the Late Granitoid intrusives suggest that they are related to contemporaneous subduction. Some Late Granitoids (GII of the Central Depression) show evidence of significant crustal contamination much like that of modern Andean magmatism.

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Section: Previous Workmentioning

confidence: 98%

“…2). Only the youngest plutonic complexes are not penetrated by basic dikes (Pichowiak and Breitkreuz, 1984).…”

Section: Geologic Settingmentioning

confidence: 99%