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Abstract

The three essential felsic species occur in two sizes. The larger plaioclases are euhedral and zoned and are pheocrysts, in places glomeroporphritic. A few large subhedral kaolinized orthoclase grains are present as are large quartz anhedra. These are set in a poorly defined groundmass of variable grained quartz, orthoclase, plagioclase, biotite, and hornblende. Of these the mafics are subhedral, the plagioclase is euhedral, and the others anhedral. Hornblende, more strongly altered than biotite, is variably colored in pale green, bluish green and buff. It is replaced by chlorite and epidote. Accessories are magnetite, apatite, sphene and zircon.

Note

The author has given permission for this work to be deposited in the Digital Archive of Colorado College.

GY 202 Intro. to Petrology

Administrative Notes

The author has given permission for this work to be deposited in the Digital Archive of Colorado College.

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PID
coccc:19271