Metabasitas, metaultrabasitas y mineralizaciones asociadas de la zona Sur de la Cordillera de la Costa Chilena

1. J.M. González-Jiménez ¹
2. G. Plissart ²
3. L.N.F. Garrido ³
4. J.C. Moral ²
5. J. Berger ⁴
6. C. Marchesi ¹
7. H. Diot ⁵
8. R. Piña ⁶
9. M. Ramón ¹
10. C. Monnier ⁵
11. J.A. Padrón-Navarta ⁷
12. F. Gervilla ¹

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Abstract

The Chilean Coastal Cordillera comprise two parallel N–S trending metamorphic belts —Western and the Eastern series with metamorphism at high and low P/T ratios, respectively— that correspond to different portion of an accretionary complex developed at the southern margin of Gondwana during the Late Paleozoic. The metasedimentary rocks of the Western Series host small bodies of metamorphosed basic (metagabbros) and utrabasic (serpentinites) rocks (usually < 1 km2), which crop out at the localities of Tirúa, La Cabaña, Gorbea, Toltén, Palo Blanco, Caman, Los Ulmos, Morro Bonifacio, Madre de Dios, Quitratué and Voipire. These rocks preserve oceanic geochemical fingerprints of an oceanic lithosphere formed in a marginal basin developed in the rear of an intra-oceanic island arc, in which were formed mantle-hosted chromite ores (e.g., La Cabaña) and ocean-floor sedimentary-hosted volcanogenic massive sulfides (e.g., Tirúa). Overall the rocks register a prograde metamorphism related with burial at different depth during subduction, and final exhumation through the bottom of the prism within a subduction channel

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