File:Chromitic serpentinite (Soldiers Delight Ultramafite; Red Pit Mine, State Line Serpentinite District, southeastern Pennsylvania, USA) (14822036482).jpg
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| Description |
Chromitic serpentinite from Pennsylvania, USA. (5.3 cm across at its widest) Light green = serpentine Black = magnesiochromite ((Mg,Fe)Cr2O4) Ophiolites are fragments of oceanic lithosphere (basaltic crust + uppermost mantle) that have been metamorphosed and plastered onto the edges of continental lithospheric plates by obduction (the opposite of subduction). The rock shown above is from the Soldier’s Delight Ultramafite. It represents metamorphosed chromitic dunite from the upper mantle exposed in an ophiolite. Unit & age: Soldier’s Delight Ultramafite, lower Baltimore Mafic Complex, probably Neoproterozoic to Cambrian oceanic lithosphere (one published igneous date is 490 Ma - near-latest Cambrian), metamorphosed during the Taconic Orogeny (Late Ordovician-Silurian). Locality: Red Pit Mine, ~0.3 miles northeast of milepost 21 along Mason-Dixon Road, southern Fulton Township, far-southern Lancaster County, State Line Serpentinite District, southeastern Pennsylvania, Maryland-Pennsylvania-Delaware Piedmont, USA |
| Date | |
| Source | Chromitic serpentinite (Soldiers Delight Ultramafite; Red Pit Mine, State Line Serpentinite District, southeastern Pennsylvania, 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@N05/14822036482 (archive). It was reviewed on 30 November 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 | |
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| current | 17:08, 30 November 2019 | | 992 × 771 (167 KB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via #flickr2commons |
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