File:Magnetite-pyrite-actinolite rock (Jurassic, 156-162 Ma; Mina 5, Marcona Magnetite Deposit, Ica Department, Peru) 1.jpg
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| Description |
English: Magnetite-pyrite-actinolite rock from the Jurassic of Peru.
Rocks of the Jurassic-aged Marcona Magnetite Deposit in southern Peru are mined for their iron content. The deposit has been called a skarn (= contact metamorphic deposit), but it appears to be a magmatic deposit - the magnetite crystallized from an iron oxide-rich melt (see Chen et al., 2010). This particular sample is consistent with mineralization stage M-III of Chen et al. (2010) - it has magnetite (= black, Fe3O4 - iron oxide), pyrite (= brassy gold, FeS2 - iron sulfide), and actinolite amphibole (= very dark green, Ca2(Mg,Fe)5Si8O22(OH)2 - calcium magnesium iron hydroxy-silicate). Age: Late Jurassic, 156 to 162 Ma Locality: Mina 5, Marcona Magnetite Deposit, southern Nazca Province, southern Ica Department, southern Peru (15° 11' 31.40" South latitude, 74° 07' 42.70" West longitude) Some info. from: Chen et al. (2010) - The Marcona Magnetite Deposit, Ica, south-central Peru: a product of hydrous, iron oxide-rich melts? Economic Geology 105: 1441-1456. |
| Date | |
| Source | https://www.flickr.com/photos/47445767@N05/50517779562/ |
| Author | James St. John |
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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/50517779562. It was reviewed on 23 October 2020 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
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| current | 18:39, 23 October 2020 | | 2,980 × 2,340 (5.69 MB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/50517779562/ with UploadWizard |
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