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Filtrado por: Creador Haynes, John Tweedt. Editor University of Cincinnati

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

Descripción/Resumen:

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.

Creador/Autor:

Haynes, John Tweedt.

Peticionario:

UC Libraries

Fecha modificada:

03/26/2018

Fecha modificada:

03/26/2018

Fecha de creacion:

1989

Licencia:

All rights reserved