File:Granite orbiculaire.jpg
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Summary
| Description |
Français : Granite orbiculaire, plage à 11 km au nord de Caldera, province de Copiapó, région III, Chili Français : . Il s’agit de blocs composés de hornblende et de biotite (202-178Ma), avec des cristallisations globulaires de 7cm de diamètre.Il s'agit d'un affleurement de 275m2. Le panneau sur place explique que les orbicules sont constituées au centre de quartz, puis de de silicate d’alumine, calcium, sodium et de hornblende, biotite, orthoclase et magnétite. Cette roche est aussi nommée tonalite orbiculaire, elle est proche de la diorite orbiculaire
̇Cest un Monument national chilien..
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| Date | |||
| Source | Own work | ||
| Author | Bachelot Pierre J-P |
| Camera location |  | View this and other nearby images on: OpenStreetMap |  |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 09:01, 12 January 2014 | | 2,048 × 1,360 (2.29 MB) | Bpierreb | User created page with UploadWizard |
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