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USGS Denver Inclusion Analysis Laboratory

Denver Inclusion Analysis Laboratory (DIAL)

A consortium of geoscientists at the U.S. Geological Survey in Denver, CO that have optimized an unparalleled array of instruments for single and bulk inclusion analysis.

Welcome to the DIAL web site. Find information on inclusions, DIAL instruments and personnel, applications to mineral resource investigations, detailed information for prospective users, and contacts.


The chemical and isotopic composition of melt and fluid inclusions is essential to understand how magmas and hydrothermal fluids evolve and generate significant ore deposits. Such data are critical to the development of reliable assessment models for mineral resources.

To document petrographic relations among inclusions and their host minerals, DIAL is equipped with supporting sample preparation equipment, petrographic microscopes with ultraviolet (UV), infrared (IR), or cathodoluminescence (CL) capability, scanning electron microscopy-cathodoluminescence (SEM-CL), and digital imaging systems. Single inclusion instruments include gas flow and conductive heating/freezing stage microscopes, electron microprobe, laser Raman spectroscope, laser ablation or thermal decrepitation -quadrupole mass spectrometer and -ion trap-time of flight-mass spectrometer, as well as laser ablation-inductively coupled plasma-mass spectrometer. Bulk analysis methods include dual ion chromatograph, quadrupole mass spectrometer, static high-resolution sector mass spectrometer, and isotope ratio mass spectrometers. The combination of, and normalization between, single and bulk inclusion data enables comprehensive characterization of magmas and hydrothermal fluids [T, P, d, X, isotopes] and identification of the conditions, processes, and mass transfer that were critical to resource genesis.

Mineral Resources Program
Eastern Central GMEG Alaska Minerals Information Crustal Geophysics and Geochemistry Spatial Data

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