Chapter I: Geology of a Middle Tertiary Clay Deposit in thePatagonia Mountains near Harshaw, Santa Cruz County, Southeastern Arizona
Bulletin
2209-I
By: Brenda B. Houser
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Abstract
A middle Tertiary rhyolite tuff on the northeast side of the Patagonia Mountains in Santa Cruz County, southeastern Arizona contains lenses of calcareous low-swelling montmorillonite clay, as much as 10 to 15 m thick. The presence of the tuff has been known for years, but the clay has not been described previously. The clay lenses, which are virtually silt- and sand-free, were probably formed by diagenetic alteration of fairly clean ash-fall-tuff beds. In preliminary tests, the clay exhibited only about 9 percent shrinkage on drying and about 1 percent shrinkage on firing. Cracking and distortion were minimal in both drying and firing. Further testing needs to be done on the clay to determine its suitability as a specialty clay or as an additive to other clays.
Suggested Citation
Houser, B.B., 2005, Chapter I: Geology of a Middle Tertiary Clay Deposit in thePatagonia Mountains near Harshaw, Santa Cruz County, Southeastern Arizona (Version 1.0): U.S. Geological Survey Bulletin 2209, iii, 7 p., https://doi.org/10.3133/b2209I.
| Publication type | Report |
|---|---|
| Publication Subtype | USGS Numbered Series |
| Title | Chapter I: Geology of a Middle Tertiary Clay Deposit in thePatagonia Mountains near Harshaw, Santa Cruz County, Southeastern Arizona |
| Series title | Bulletin |
| Series number | 2209 |
| Chapter | I |
| DOI | 10.3133/b2209I |
| Edition | Version 1.0 |
| Year Published | 2005 |
| Language | ENGLISH |
| Contributing office(s) | Western Mineral Resources |
| Description | iii, 7 p. |
| Larger Work Type | Report |
| Larger Work Subtype | USGS Numbered Series |
| Larger Work Title | Contributions to Industrial-Minerals Research |
| Online Only (Y/N) | Y |