| Abstract: | Saprolite profiles (12) that formed over various crystalline rocks from the Charlotte 1o X 2o quadrangle showed overall similarity in their clay mineralogy to depths of 6 to 45 m indicating control by weathering processes rather than by rock type. Most saprolite contained 10-25% clay, and ranged 3 to 70%. Kaolinite and halloysite composed = or >75% of the clay fraction of most samples. The ratio kaolinite:halloysite ranged widely, from 95% kaolinite to 90% halloysite, independent of depth. Clay-size mica was present in all profiles, and ranged 5-75% over a sericite schist. Mixed-layer mica-smectite and mica-vermiculite were subordinate; discrete smectite and vermiculite were rare. The abundance of halloysite indicates a continuously humid environment since the time of profile formation, because of the rapidity with which halloysite dehydrates irreversibly. -R.S.M. |
| Genre: | Article |
| ProdID: | 70012165 |
| Citation Author: | Loferski, P. J. |
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| Citation End Page: | 202 |
| Citation Issue: | 4 |
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| Citation Language: | English |
| Citation Larger Work Title: | Southeastern Geology |
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| Citation Number Of Pages: | 10 |
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| Citation Search Results Text: | Clay mineralogy of weathering profiles from the Carolina Piedmont.; 1981; Article; Journal; Southeastern Geology; Loferski, P. J. |
| Citation Start Page: | 193 |
| Citation Volume: | 22 |
| Citation Year: | 1981 |
| Type: | citation/reference |
| Text: | Clay mineralogy of weathering profiles from the Carolina Piedmont.; 1981; Article; Journal; Southeastern Geology; Loferski, P. J. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Thu, 1 Jan 1981 00:00 -0600 |
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