Other Scholarly Content
 

Confirming the Lowland Creek Volcanic Field geochronology and activity overlying polymetallic vein deposits of the Mt. Thompson quadrangle in SW Montana

Public Deposited

Contenu téléchargeable

Télécharger le fichier PDF
https://ir.library.oregonstate.edu/concern/defaults/sj139340j

Descriptions

Attribute NameValues
Creator
Abstract
  • There are few modern isotopic ages of igneous rocks and polymetallic (Pb-Zn-Ag-Cu-Au) hydrothermal mineral veins of the Mt. Thompson quadrangle in southwestern Montana. Lithology ages of this region vary from approximately 85-80 Ma Butte granite(Kbg) (Lund et al. 2002) to 48.6 Ma of Lowland Creek Volcanic Field (LCVF) (Dudas et al. 2010). While remapping the 1962 Brecraft map (1:100,000 scale) to a 7.5-minute quadrangle (1:24,000 scale) map we collected a suite of samples for geochemical testing and Argon40 – Argon39 geochronology, samples were selected based upon prominence of depositional formation and location. Four samples were selected for Ar-Ar geochronology NHO-16-05 a LCVF tuff, NHO-16-010 a diatreme vent sample from the Montana Tunnels mine, NHO-16-075 a volcanic dike, and NHO-16-081 a quartz latite dike that cut’s the volcanic diatreme. Target phases include biotite from NHO-16-05, NHO-16-075, NHO-16-081, and sericite from NHO-16-010. Geochronological analysis of the above four sampled yielded ages ranging from 53.33 ± 0.15 Ma to 51.89 ± 0.07 Ma. The results from the 40Ar/39Ar provide parameters for formation and deposition of volcanic and hydrothermally altered polymetallic dikes.
Resource Type
Date Available
Date Issued
Degree Level
Degree Name
Advisor
Conference Name
Conference Location
  • Corvallis, Oregon, USA
Academic Affiliation
Non-Academic Affiliation
Déclaration de droits
Funding Statement (additional comments about funding)
  • USGS EdMap program, CEOAS undergraduate research funding
Publisher
Peer Reviewed
Language
Replaces

Des relations

Parents:

This work has no parents.

Dans Collection:

Articles

La vignette Titre Date de téléchargement Visibilité actes
file details BlessingJacob2018.pdf 2017-07-21 Public Télécharger