February 2018 

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Resource details

Resource ID

521

Access

Open

Contributed by

Admin User

Volume

50

Named person(s)

Michael Stearns

Date

12 February 18

Number

2

Abstract

Contact aureoles record the cumulative effects on wall rocks of magma emplacement. Like the plutons they surround, contact aureoles have long been regarded to form geologically instantaneously. Protracted incremental emplacement of plutons must be reconciled with the wallrock record of heat and mass transfer. Fundamental questions include how heat and material move from intrusions into their aureoles and how long that process takes. The Little Cottonwood stock is surrounded by a ~2 km-wide contact aureole that contains prograde AFM mineral assemblages in the pelitic layers of the Proterozoic Big Cottonwood Formation. The Alta stock is surrounded by a well characterized ~1 km contact aureole containing both
prograde AFM and CMS mineral assemblages in Ophir
Shale and Mississippian dolostones, respectively.

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