Department

Department of Geology and Geophysics

First Advisor

Dr. Arthur Snoke

Description

The Albany Granite is a highly ferroan potassium - rich granite that has been associated with both a 1.75 Ga event of magmatism in the Sierra Madre Mountains as well as widespread 1.4 Ga magmatism that took place from southeastern California to northeastern Canada. The amount of time separating these events suggests that the Albany Granite cannot logically be associated with both although it has been dated to correlate with each. Therefore, the purpose of this research project is to resolve this petrologic/geochronologic conundrum and evaluate the tectonic implications of the emplacement and deformation of the Albany Granite based on an extensive new data set derived from field - based studies, petrography, geochemical analysis and U - Pb geochronolo gy. Initial results indicate that the Albany Granite is ~1.4 Ga and thus is most likely a western outcrop of the Sherman Granite. This result has implications for the intrusive system present at 1.4 Ga in the region, the extent of the Sherman Batholith, an d the first evidence of a 1.4 Ga deformational event that extends as far north as Wyoming.

Comments

Oral Presentation, Wyoming NSF EPSCoR and UW Honors Program

Share

COinS
 

Paleoproterozoic Granite or Mesoproterozoic Batholith? Petrographic and Geochronologic Study of th e Albany Granite of the Medicine Bow Mountains, Southeastern WY

The Albany Granite is a highly ferroan potassium - rich granite that has been associated with both a 1.75 Ga event of magmatism in the Sierra Madre Mountains as well as widespread 1.4 Ga magmatism that took place from southeastern California to northeastern Canada. The amount of time separating these events suggests that the Albany Granite cannot logically be associated with both although it has been dated to correlate with each. Therefore, the purpose of this research project is to resolve this petrologic/geochronologic conundrum and evaluate the tectonic implications of the emplacement and deformation of the Albany Granite based on an extensive new data set derived from field - based studies, petrography, geochemical analysis and U - Pb geochronolo gy. Initial results indicate that the Albany Granite is ~1.4 Ga and thus is most likely a western outcrop of the Sherman Granite. This result has implications for the intrusive system present at 1.4 Ga in the region, the extent of the Sherman Batholith, an d the first evidence of a 1.4 Ga deformational event that extends as far north as Wyoming.