Abstract

Alteration of clay minerals by weathering in Tazewell, early Cary, and late Cary tills of the Northwest Allegheny Plateau was determined by X-ray technique. In each locality 10 samples closely spaced through the entire profile from fresh unweathered till to the A soil zone were studied. Each zone in the weathering profile of till is characterized by a specific clay-mineral assemblage. The well-crystallized illite in the fresh unweathered till is changed by hydration of the intermica sheets, and in the A soil zone illite-montmorillonite mixed layers are abundant. The well-organized chlorite of the fresh unweathered till is altered by hydration of the brucite sheets culminating in the development of vermiculite in the A soil zone.

This content is PDF only. Please click on the PDF icon to access.

First Page Preview

First page PDF preview
You do not currently have access to this article.