Pyrite deformation textures in the massive sulfide ore deposits of the Norwegian Caledonides

2010 ◽  
Vol 483 (3-4) ◽  
pp. 269-286 ◽  
Author(s):  
Craig D. Barrie ◽  
Alan P. Boyle ◽  
Nigel J. Cook ◽  
David J. Prior
Keyword(s):  
Massive Sulfide ◽  
Ore Deposits ◽  
Sulfide Ore ◽  
Deformation Textures ◽  
Norwegian Caledonides

Performance of low-fold scalar migration for downhole seismic imaging of massive sulfide ore deposits at Norman West, Sudbury, Canada

Geophysics ◽  
2012 ◽  
Vol 77 (5) ◽  
pp. WC3-WC13 ◽  
Author(s):  
Christof Mueller ◽  
Gilles Bellefleur ◽  
Erick Adam ◽  
Gervais Perron ◽  
Marko Mah ◽  
...  
Keyword(s):  
Seismic Data ◽  
Seismic Imaging ◽  
Signal To Noise Ratio ◽  
Massive Sulfide ◽  
Ore Deposits ◽  
Ore Deposit ◽  
Seismic Scattering ◽  
Vertical Seismic Profiling ◽  
Sudbury Igneous Complex ◽  
Sulfide Ore

The Downhole Seismic Imaging consortium conducted two consecutive vertical seismic profiling surveys in the Norman West mining camp (Sudbury, Canada) in 1998 and 1999. These were aimed toward imaging a massive sulfide ore deposit situated within the footwall of the Sudbury Igneous Complex (SIC). Three-component seismic data were acquired in four boreholes with variable signal-to-noise ratio and poor polarization quality. Consequently, the images suffered from strong azimuthal ambiguity. A strike filter, passing only reflections originating from within the SIC, was applied during migration to enhance interpretability of the images obtained. Migrated images showed structures correlating with the known position of an ore deposit located 1800 m away from one borehole (N40). Diffraction coherency migration enhanced the image of the deposit, and suggested strong seismic scattering from within the footwall of the SIC.

A general solution for a spherical conductor in a magnetic dipole field

Geophysics ◽  
1979 ◽  
Vol 44 (4) ◽  
pp. 781-800 ◽  
Author(s):  
Melvyn E. Best ◽  
Basil R. Shammas
Keyword(s):  
Magnetic Dipole ◽  
Spherical Model ◽  
Massive Sulfide ◽  
Ore Deposits ◽  
Dipole Field ◽  
First Approximation ◽  
Sulfide Ore ◽  
Magnetic Dipole Field ◽  
Airborne Em ◽  
Spherical Conductor

In electromagnetic (EM) prospecting for volcanogenic massive sulfide ore deposits, a significant number of the responses are associated with compact conductors. As a first approximation, these bodies are studied using a conducting sphere model. An exact solution is given for a spherical conductor excited by a magnetic dipole field in free space for arbitrary transmitter‐receiver (T-R) configurations with receiver positions inside or outside the conductor. In this general approach, it is possible to investigate the lateral attenuation of EM systems. In particular, the effects of flight‐line displacement from the center of the spherical conductor on several airborne EM responses are presented. For example, at normal flying heights, the standard Dighem system has a lateral attenuation 50 times larger than the EM-30 system (for a sphere of 100 m radius). Field results from the Clearwater deposit in New Brunswick are compared to the spherical model attenuations for the Dighem, Otter, and F-500 systems. The behavior of the total magnetic fields [Formula: see text] and [Formula: see text] inside the conductor are presented in the form of magnitude and phase contours. The [Formula: see text] amplitude was found to be approximately the same inside and outside the sphere; the [Formula: see text] amplitude, however, differs significantly in these two regions. Observations such as these may provide some guidance in subdividing anomalous inhomogeneities in future numerical modeling.

Hydrothermal models for the generation of massive sulfide ore deposits

1985 ◽  
Vol 90 (B10) ◽  
pp. 8769-8783 ◽  
Author(s):  
Robert P. Lowell ◽  
Peter A. Rona
Keyword(s):  
Massive Sulfide ◽  
Ore Deposits ◽  
Sulfide Ore

THE 3D TRANSIENT ELECTROMAGNETIC FORWARD MODELING OF VOLCANOGENIC MASSIVE SULFIDE ORE DEPOSITS

2016 ◽  
Vol 59 (6) ◽  
pp. 725-733 ◽  
Author(s):  
LI Rui-Xue ◽  
WANG He ◽  
XI Zhen-Zhu ◽  
LONG Xia ◽  
HOU Hai-Tao ◽  
...  
Keyword(s):  
Forward Modeling ◽  
Massive Sulfide ◽  
Ore Deposits ◽  
Volcanogenic Massive Sulfide ◽  
Transient Electromagnetic ◽  
Sulfide Ore

Foreword and Introduction

Geophysics ◽  
1984 ◽  
Vol 49 (7) ◽  
pp. 849-853 ◽  
Author(s):  
Misac N. Nabighian
Keyword(s):  
Time Domain ◽  
Mining Industry ◽  
Massive Sulfide ◽  
Groundwater Exploration ◽  
Ore Deposits ◽  
Special Issue ◽  
Transient Techniques ◽  
Sulfide Ore ◽  
Time Domain Electromagnetic ◽  
The Subject

Over the last few years there has been a dramatic surge of interest in time‐domain electromagnetic (TDEM) methods of exploration as evidenced by the proliferation of commercially available time‐domain equipment and contractors, by the extensive research carried out at various companies and universities, and by the large number of papers published on the subject. At the last few SEG Annual Meetings there were special sessions devoted solely to TDEM and there was even a time‐domain electromagnetic workshop at the SEG Annual Meeting in Las Vegas. As such, it is not difficult to understand the motivation for preparing this Special Issue of Geophysics devoted to TDEM techniques: to present recent advances and to give us a glimpse at the future. At this moment it seems appropriate to trace the evolution of transient techniques from their early beginnings to the present. Historically, TD techniques have evolved along two parallel paths, transient EM soundings and transient EM prospecting (or inductive TDEM). The first technique is used primarily to delineate layered structures of interest in oil and groundwater exploration. It is also used in delineating zones of high conductivity within the ground, with the expectation that they might be associated with either geothermal or massive sulfide targets. By contrast, transient EM prospecting is primarily used for locating massive sulfide ore deposits at great depths, and its use is associated almost exclusively with the mining industry.

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