Fitxategi:Madocite (tourmaline-pyrite metamorphite), Madoc Ontario.jpg
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Laburpena
| Deskribapena |
“Madocite” (field of view ~2.7 cm across) from the Precambrian of Ontario. Here’s a rock from Ontario having a mineral combination you don’t see very often. This sample is from a metamorphosed mafic dike that intrudes tremolite-talc schists hosted in dolomitic marble. The metamorphism has converted the original mafic igneous minerals into a mixture dominated by tourmaline (black) and pyrite (brassy gold). Some of the small bright white patches are talc. Tourmaline-pyrite metamorphic rocks lack a formal name, so the term “madocite” has been used by some geologists. Published mineral analysis indicates that “madocite” contains tourmaline, pyrite, tremolite, and some phlogopite mica. Age of metamorphism - probably ~1.24 billion years, during the Mesoproterozoic. Subsequent metamorphism occurred at ~1.1 billion years, during assembly of the Rodinia supercontinent. Initial metamorphic agent - probably emplacement of the nearby Deloro Granite. Locality: Canada Talc Limited mine at Madoc, south-central Hastings County, southeastern Ontario, southeastern Canada. Most info. from: Dunn (1998) - Formation of dolomite-hosted massive talc at Madoc, Ontario. Geological Society of America Abstracts with Programs 30(7): 229-230. |
| Data | |
| Jatorria | Madocite (tourmaline-pyrite metamorphite) (Precambrian; Canada Talc Limited Mine, Madoc, south-central Hasting County, se Ontario, se Canada) |
| Egilea | James St. John |
Lizentzia
- Askea zara:
- partekatzeko – lana kopiatzeko, banatzeko eta bidaltzeko
- birnahasteko – lana moldatzeko
- Ondorengo baldintzen pean:
- eskuduntza – Egiletza behar bezala aitortu behar duzu, lizentzia ikusteko esteka gehitu, eta ea aldaketak egin diren aipatu. Era egokian egin behar duzu hori guztia, baina inola ere ez egileak zure lana edo zure erabilera babesten duela irudikatuz.
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This image was originally posted to Flickr by jsj1771 at https://www.flickr.com/photos/47445767@N05/14874133400. It was reviewed on 2014ko abuztuaren 31 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0. |
Fitxategiaren historia
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| Data/Ordua | Iruditxoa | Neurriak | Erabiltzailea | Iruzkina | |
|---|---|---|---|---|---|
| oraingoa | 23:18, 31 abuztua 2014 | | 3.008 × 2.000 (2,37 MB) | Tillman | Transferred from Flickr via Flickr2commons |
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