| Abstract: | Understanding of the crust has improved dramatically following the application of seismic reflection and refraction techniques to studies of the deep crust. This is particularly true in areas where the last tectonic event was extensional, such as the Basin and Range province of the western United States and much of western Europe. In these regions, a characteristic reflective pattern has emerged, whereby the lower crust is highly reflective and the upper crust and upper mantle are either poorly reflective or strikingly nonreflective. In the metamorphic-core-complex belt in the western United States, where extension can be as much as an order of magnitude greater than in the more classic continental rift zones, the lower crustal reflectivity thickens and rises, yielding a picture of a crust that is reflective throughout. If metamorphic core complexes are representative of extended continental crust world-wide, then these results suggest that magmatism and ductile flow have also contributed to the evolution of the middle and lower crust in many other areas around the world. -from Authors |
| Genre: | Article |
| ProdID: | 70013181 |
| Citation Author: | McCarthy, J.; Thompson, G. A. |
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| Citation End Page: | 1374 |
| Citation Issue: | 9 |
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| Citation Language: | English |
| Citation Larger Work Title: | Geological Society of America Bulletin |
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| Citation Number Of Pages: | 14 |
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| Citation Search Results Text: | Seismic imaging of extended crust with emphasis on the western United States; 1988; Article; Journal; Geological Society of America Bulletin; McCarthy, J.; Thompson, G. A. |
| Citation Start Page: | 1361 |
| Citation Volume: | 100 |
| Citation Year: | 1988 |
| Type: | citation/reference |
| Text: | Seismic imaging of extended crust with emphasis on the western United States; 1988; Article; Journal; Geological Society of America Bulletin; McCarthy, J.; Thompson, G. A. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Fri, 1 Jan 1988 00:00 -0600 |
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