File:Chlorite-sericite-quartz phyllite (Mona Formation, Neoarchean, 2.7 Ga; Harvey Quarry, Marquette, Michigan, USA) (8281289773).jpg
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| Description |
Chlorite-sericite-quartz phyllite from the Precambrian of Michigan, USA. (field of view ~7.7 centimeters across) This rock is from the Mona Formation (a.k.a. Mona Schist), an extremely thick, metamorphosed, heterolithic unit of Neoarchean age in the Marquette-Ishpeming area of Michigan's Upper Peninsula. The original rocks making up the Mona are inferred to be, and in many cases are demonstrably, volcanic rocks. The sample shown above is a chlorite-sericite-quartz phyllite from the Lighthouse Point Member of the Mona Formation. Its protolith was likely a volcanic tuff. The rock surface in the picture is a foliation surface with superimposed crenulations that strike from the upper right to the lower left. The metamorphism and development of primary foliation occurred during the Kenoran Orogeny (~2.7 billion years). The crenulations formed during the subsequent Penokean Orogeny (~1.84-1.88 billion years). Stratigraphy: Lighthouse Point Member, Mona Formation, Neoarchean, ~2.7 Ga (= metamorphic age) Locality; Harvey Quarry, western side of Rt. 41, south of the town of Marquette, Upper Peninsula of Michigan, USA |
| Date | |
| Source | Chlorite-sericite-quartz phyllite (Mona Formation, Neoarchean, 2.7 Ga; Harvey Quarry, Marquette, Michigan, USA) |
| 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@N05/8281289773 (archive). It was reviewed on 5 December 2019 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 | 05:44, 5 December 2019 | | 960 × 593 (596 KB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via #flickr2commons |
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