Skip to main content
U.S. flag

An official website of the United States government

Geochronologic data from xenoliths near the Stillwater Complex, Montana

July 8, 2020

The Archean Stillwater Complex, a layered ultramafic-to-mafic intrusion, is exposed along the northern side of the Beartooth Mountains in Montana. To the north of the Stillwater outcrops, a gravity anomaly is located where Phanerozoic rocks may unconformably overlie the complex. These Phanerozoic rocks are intruded by Cretaceous plutons that have gabbroid inclusions that look like metamorphosed rocks of the Stillwater Complex. To determine the age of the inclusions, U-Pb isotopic data were collected on zircon in xenoliths from the Sliderock Mountain and Susie Peak plutons, Montana, using the sensitive high-resolution ion microprobe-reverse geometry (SHRIMP-RG) at Stanford University.

Publication Year 2020
Title Geochronologic data from xenoliths near the Stillwater Complex, Montana
DOI 10.5066/P9ZSTLUQ
Authors Michael L Zientek, Jorge A Vazquez, Heather L Parks
Product Type Data Release
Record Source USGS Digital Object Identifier Catalog
USGS Organization Geology, Minerals, Energy, and Geophysics Science Center