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Filtrage par: Creator/Author Haynes, John Tweedt. Subject Geology

The Mineralogy And Stratigraphic Setting Of The Rocklandian (Upper Ordovician) Deicke And Millbrig K Bentonite Beds Along The Cincinnati Arch And In The Southern Valley And Ridge.

Type:

Etd

Description/Abstract:

Petrographic study of the Deicke and Millbrig K-benonite beds (altered volcanic ash) of Rocklandian age has revealed that they can be distinguished by their non-clay mineralogy. The Deicke phenocryst assemblage is primarily labradorite, Fe-Ti oxides, apatite, and zircon, while the Millbrig assemblage is primarily andesine, quartz, biotite, apatite, and zircon. The Deicke is altered dacitic ash, while the Millbrig is altered rhyodacitic ash.

Creator/Author:

Haynes, John Tweedt.

Submitter:

UC Libraries

Date Uploaded:

03/26/2018

Date Modified:

03/26/2018

Date Created:

1989

License:

All rights reserved