Heritage Geophysics
Heritage Geophysics Available Instruments and Products home rentals Heritage Geophysics Available Instruments and Products case histories Heritage Geophysics Available Instruments and Products second hand Heritage Geophysics Training training Heritage Geophysics Available Instruments and Products international sales Heritage Geophysics Available Instruments and Products contact Heritage Geophysics Available Instruments and Products sitemap Heritage Geophysics Available Instruments and Products
Heritage Geophysics Available Instruments and Products
Resistivity Meters & Imaging Systems
Resistivity Meters
Resistivity Imaging Systems
Resistivity Monitoring Systems
Resistivity Software

Induced Polarization
IP - Receivers
IP - Transmitters

Electromagnetics
Multi Frequency EM
T-VLF System

Logging Probes
Borehole Logging Probe

Magnetic Susceptibility Meters
SM-30 Field
SM-100 Lab
SM-105 Lab
SM-400 In-Situ

Magnetometers
Magnetometers

Magnetic Resonance Systems
NUMIS & NUMIS Plus

Seismographs
Land Seismographs
Marine Seismographs

Seismometers
Sensors

Magnetotelluric
StrataGEM

Case Histories      Back to Case Histories List


Use of Gamma Spectrometry in Ontario for Rare Earth Element Exploration

 

The Thorium-bearing Allan Lake carbonatite, located in Algonquin Park, Ontario, is a small (0.4 kmę), unexposed ankeriticsideritic instrusion hosted by gneisses. Although the intrusion is surrounded by a poorly exposed fenitic aureole, characterized by radial, hematitic veins (fig.B) and breccia dykes (fig. C) it does not outcrop. However, glaciation has produced a large, distinctive dispersal train which was discovered and effectively mapped using airborne (fig. A) and ground gamma ray spectrometry.

During ground investigations, in-situ spectrometry, as provided by the GR-320, rapidly delineated the extent of the dispersal train (fig. D) and lead to the discovery of many carbonatite boulders, particularly whose with high concentrations of rare earth elements (REE's)

Geochemical analysis of drill core, boulder and till samples shows that carbonatite is enriched in FE, Mn, Zn, Th, Ce, La, and Ba, with elevated concentrations of Y, P, Cu, Pb, Mo, Co, and U. The intimate association of Th with Nb and Zn, and the diminishing, "down-ice" dispersion of these elements, is illustrated in fig. D.

Unlike many other alkalic/ carbonatite complexes, the Allen Lake instrusion lacks a prominent magnetic signature. This underscores the importance of incorporating modern, calibrated, digital airborne and ground gamma ray spectrometric techniques into regional and detailed mapping or exploration programs relating to the search for these deposits.

Gamma2.JPG (27628 bytes)

Back to TOP
home rentals case histories second hand international sales contact sitemap

Heritage Geophysics Inc.   625 Valley Road, Littleton, CO 80124   Tel & Fax: (303) 790-4237   Cell (720) 320-2821

© 1998-2008   Heritage Geophysics Inc.   All rights reserved.

r1 r2 r3 r4 r5 r6 r7