Clay mineralogy of weathering profiles from the Carolina Piedmont.
Southeastern Geology
By: P. J. Loferski
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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.
Suggested Citation
Loferski, P., 1981, Clay mineralogy of weathering profiles from the Carolina Piedmont.: Southeastern Geology, v. 22, no. 4, p. 193-202.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Clay mineralogy of weathering profiles from the Carolina Piedmont. |
| Series title | Southeastern Geology |
| Volume | 22 |
| Issue | 4 |
| Year Published | 1981 |
| Language | English |
| Larger Work Type | Article |
| Larger Work Subtype | Journal Article |
| Larger Work Title | Southeastern Geology |
| First page | 193 |
| Last page | 202 |