File:Nelsonite (Laramie Anorthosite Complex, Mesoproterozoic, 1.43 Ga; Laramie Range, southeastern Wyoming, USA) 18.jpg
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| Description |
English: Nelsonite from the Precambrian of Wyoming, USA.
Nelsonites are scarce intrusive igneous rocks. They are also known as FTP rocks, in reference to their composition: iron-rich (Fe), titanium-rich (Ti), and phosphorus-rich (P). Nelsonites are principally composed of dark gray to blackish, metallic-lustered magnetite (Fe3O4) and ilmenite (FeTiO3) (or ilmenomagnetite; titanian magnetite), plus apatite (CaPO4). Minor minerals reported in nelsonites include spinel, olivine, pyrrhotite, and graphite. These rocks typically occur as Fe-Ti-oxide concentrations in anorthosite complexes. They appear to form as cumulates in cooling batholiths. The sample seen here is from a lens/nodule or a dike-like intrusive body, apparently formed by remobilized Fe-Ti-oxide cumulates. Geologic unit: Laramie Anorthosite Complex (probably the Sybille Fe-Ti Oxide Deposit; Sybille Oxide Deposit), early Mesoproterozoic, 1.431 to 1.436 Ga Locality: road gravel in Johnson Creek Canyon Road (likely derived from rocks at the Sybille Pit, north of Sybille Canyon/Route 34 & east of Johnson Creek Canyon), Laramie Range, eastern Albany County, southeastern Wyoming, USA |
| Date | |
| Source | https://www.flickr.com/photos/47445767@N05/50415039932/ |
| 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@N05/50415039932. It was reviewed on 18 October 2020 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 18:32, 18 October 2020 | | 3,087 × 1,475 (3.19 MB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/50415039932/ with UploadWizard |
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