| Abstract: | The decrease in permeability (k) of the continental crust with depth (z), as constrained by geothermal data and calculated fluid flux during metamorphism, is given by log k = -14 - 3.2 log z, where A is in meters squared and z is in kilometers. At moderate to great crustal depths (>???5 km), this curve is defined mainly by data from prograde metamorphic systems, and is thus applicable to orogenic belts where the crust is being thickened and/or heated; lower permeabilities may occur in stable cratonic regions. This k-z relation implies that typical metamorphic fluid flux values of ???10-11 m/s are consistent with fluid pressures significantly above hydrostatic values. The k-z curve also predicts that metamorphic CO2 flux from large orogens may be sufficient to cause significant climatic effects, if retrograde carbonation reactions are minimal, and suggests a significant capacity for diffuse degassing of Earth (1015-1016 g/yr) in tectonically active regions. |
| Genre: | Article |
| ProdID: | 70020946 |
| Citation Author: | Ingebritsen, S. E.; Manning, C. E. |
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| Citation End Page: | 1110 |
| Citation Issue: | 12 |
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| Citation Language: | English |
| Citation Larger Work Title: | Geology |
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| Citation Number Of Pages: | 4 |
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| Citation Search Results Text: | Geological implications of a permeability-depth curve for the continental crust; 1999; Article; Journal; Geology; Ingebritsen, S. E.; Manning, C. E. |
| Citation Start Page: | 1107 |
| Citation Volume: | 27 |
| Citation Year: | 1999 |
| Type: | citation/reference |
| Text: | Geological implications of a permeability-depth curve for the continental crust; 1999; Article; Journal; Geology; Ingebritsen, S. E.; Manning, C. E. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Fri, 1 Jan 1999 00:00 -0600 |
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