folding and slumping in a layered gabbro
Abstract The layered gabbroic intrusion of Sarqata qaqa, Ubekendt Ejland, West Greenland contains numerous xenoliths of thermally metamorphosed picrite‐basalt. Folding and slumping of the layering occurs adjacent to some of these blocks. It is postulated that the structures were formed by sloped lav...
| Published in: | Geological Journal |
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| Main Authors: | , |
| Format: | Article in Journal/Newspaper |
| Language: | English |
| Published: |
Wiley
1968
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| Subjects: | |
| Online Access: | http://dx.doi.org/10.1002/gj.3350060112 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fgj.3350060112 https://onlinelibrary.wiley.com/doi/pdf/10.1002/gj.3350060112 |
| Summary: | Abstract The layered gabbroic intrusion of Sarqata qaqa, Ubekendt Ejland, West Greenland contains numerous xenoliths of thermally metamorphosed picrite‐basalt. Folding and slumping of the layering occurs adjacent to some of these blocks. It is postulated that the structures were formed by sloped lava xenoliths hitting the unconsolidated layers of crystals forming the floor of the magma chamber during the cooling history of the intrusion. The settling velocities of the xenoliths, and thickness and viscosity of the crystal mush are estimated and discussed. |
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