The thickness of Neogene and Quaternary cover across the central Interior Plateau, British Columbia: analysis of water-well drill records and implications for mineral exploration potential1This article is one of a series of papers published in this Special Issue on the theme of New insights in Cordilleran Intermontane geoscience: reducing exploration risk in the mountain pine beetle-affected area, British Columbia. 2Geological Survey of Canada (GSC) Contribution 20100036; Mineral Deposit Research Unit (MDRU, Department of Earh and Ocean Sciences, The University of British Columbia) Contribution p-261.

2011 ◽  
Vol 48 (6) ◽  
pp. 973-986 ◽  
Author(s):  
Graham D.M. Andrews ◽  
Alain Plouffe ◽  
Travis Ferbey ◽  
James K. Russell ◽  
Sarah R. Brown ◽  
...  
Keyword(s):  
British Columbia ◽  
Mountain Pine Beetle ◽  
Mineral Exploration ◽  
Three Dimensional ◽  
Research Unit ◽  
Mineral Deposit ◽  
Basic Knowledge ◽  
Data Sets ◽  
University Of British Columbia ◽  
Water Well

Analysis of over 10 000 water-well records has been used to produce new depth-to-bedrock maps for areas around five cities on the central Interior Plateau of central British Columbia: 100 Mile House, Prince George, Quesnel, Vanderhoof, and Williams Lake. Hitherto, exploration for mineral and hydrocarbon resources has been hampered by a lack of basic knowledge of the thickness of Neogene and Quaternary lithologies. Interpretation of these new maps provides first-order constraints on the localization of thick drift in pre-Late Wisconsinan bedrock paleovalleys, some of which are now buried. Basalt lavas of the Chilcotin Group are restricted to erosional remnants of previously extensive sheets emplaced onto an older peneplain. Our results confirm that the Neogene and Quaternary cover is primarily controlled by paleotopography and is generally thin and patchy across much of the region. Increased understanding of the three-dimensional distribution of cover produces a corresponding increase in the utility of geological, geochemical, and geophysical exploration techniques, and a reduction in the risk for future mineral exploration activities, especially when combined with more sophisticated data sets.

scholarly journals Three-dimensional imaging of a Ag-Au-rich epithermal system in British Columbia, Canada, using airborne z-axis tipper electromagnetic and ground-based magnetotelluric data

Geophysics ◽  
2016 ◽  
Vol 81 (1) ◽  
pp. B1-B12 ◽  
Author(s):  
Juliane Hübert ◽  
Benjamin M. Lee ◽  
Lijuan Liu ◽  
Martyn J. Unsworth ◽  
Jeremy P. Richards ◽  
...  
Keyword(s):  
British Columbia ◽  
Volcanic Rocks ◽  
Three Dimensional ◽  
Data Sets ◽  
Borehole Data ◽  
Magnetotelluric Data ◽  
Electric Field Amplitude ◽  
Epithermal System ◽  
Geologic Model ◽  
Felsic Volcanic

We have evaluated results from a study combining airborne z-axis tipper electromagnetic (ZTEM) and ground-based magnetotelluric (MT) data to image an epithermal system in British Columbia. The spatially coincident use of these two methods allowed for a direct comparison of both data sets in the overlapping frequency band and showed that both measurements were consistent. Inversion of just the ZTEM data suffered from the lack of electric field amplitude information, which could be provided by the MT data. Three-dimensional inversion modeling of the two individual data sets was performed. Models of electrical resistivity derived from both data sets were consistent and could be correlated with the geological and structural setting of the mineralization. Gold is associated with disseminated pyrite and marcasite in quartz-sericite-altered felsic volcanic rocks and intrusions, especially near the contact with mafic volcanic rocks and a late diorite intrusion. The quartz-sericite alteration yields a conductivity anomaly, relative to the more resistive mafic country rocks. Although ZTEM and MT do not possess the resolution of the geologic model derived from borehole data, our model agrees well with a regional assessment of the deposit.

scholarly journals 120 HZ Variations in Sky Brightness Over Vancouver, BC

1991 ◽  
Vol 112 ◽  
pp. 99-99
Author(s):  
David Crabtree ◽  
David Westpfahl ◽  
Harvey Richer
Keyword(s):  
British Columbia ◽  
Fourier Analysis ◽  
Direct Observation ◽  
High Speed ◽  
Data Sets ◽  
University Of British Columbia ◽  
Photometric Observations ◽  
Sky Brightness ◽  
The University ◽  
Made In

ABSTRACTWe have detected a component of sky brightness varying with a frequency of 120 Hertz during high speed photometric observations of 40 Eridani with the 30-cm telescope of the University of British Columbia. The observations were made in 1974, but only recently has their significance to the field of urban illumination been realized. The 120 Hertz component was detected by Fourier analysis of data sets of the star and of the sky alone. We confirmed that the 120 Hertz component was due to urban lighting by direct observation of a “standard source,” a lamp on the campus.

Geophysical electromagnetics: A retrospective, DISC 2017, and a look forward

2021 ◽  
Vol 40 (2) ◽  
pp. 140-148
Author(s):  
Douglas W. Oldenburg ◽  
Lindsey J. Heagy ◽  
Seogi Kang
Keyword(s):  
British Columbia ◽  
Open Source ◽  
Mineral Exploration ◽  
Educational Resources ◽  
Collaborative Practices ◽  
University Of British Columbia ◽  
Short Course ◽  
The University

Geophysical electromagnetics (EM) plays an important role in mineral exploration and is increasingly being used to help solve other problems of relevance to society. In this article we reflect, from our perspective at the University of British Columbia, on the development of EM geophysics over the years, on our attempts to enhance understanding of EM geophysics, and on its visibility and usefulness to the community. The availability of open-source resources and a shift within the EM community toward collaborative practices for sharing and creating software and educational resources have been drivers of progress toward these goals. In this article, we provide background about this trajectory and discuss how the SEG Distinguished Instructor Short Course was a catalyst in our development of software and resources as well as in our broader goal of creating more collaborative connections within the EM community.

Late Wisconsinan glacial history in the Bonaparte Lake map area, south-central British Columbia: implications for glacial transport and mineral exploration1This article is one of a series of papers published in this Special Issue on the theme of New insights in Cordilleran Intermontane geoscience: reducing exploration risk in the mountain pine beetle-affected area, British Columbia.2Earth Sciences Sector Contribution Number: 20100093.

2011 ◽  
Vol 48 (6) ◽  
pp. 1091-1111 ◽  
Author(s):  
A. Plouffe ◽  
J.M. Bednarski ◽  
C.A. Huscroft ◽  
R.G. Anderson ◽  
S.J. McCuaig
Keyword(s):  
British Columbia ◽  
Mountain Pine Beetle ◽  
Mineral Exploration ◽  
Source Region ◽  
Mineralogical Composition ◽  
Glacial History ◽  
Ice Flow ◽  
Glacial Sediments ◽  
South Central ◽  
Late Wisconsinan

This study is centred on the Bonaparte Lake map area located in the southern Interior Plateau of south-central British Columbia. The reconstruction of the Late Wisconsinan glacial history of this part of the southern sector of the Cordilleran Ice Sheet incorporates (i) the analysis and interpretation of landforms of various scales, (ii) the sedimentology and stratigraphy of glacial sediments, and (iii) the geochemical and mineralogical composition of till and analysis of regional glacial dispersal of these components. The onset of the last glacial event was initiated by ice advancing westerly and southwesterly into the study area from an alpine source region located in the Cariboo Mountains. As glaciation intensified, ice from the Coast Mountains coalesced with the Cariboo Mountain ice over the Interior Plateau and developed into an ice divide around 52° north latitude, which resulted in ice flow to be diverted to a southerly direction over the study area. The two dominant ice-flow directions produced palimpsest dispersal that was measured by three tracers in till including thorianite grains and terbium concentrations in the heavy mineral fraction, and granitoid pebble percentage. The two main phases of ice flow identified within our study area have significant implications for mineral exploration that uses mineral tracing in glacial sediments, especially in the area underlain by the highly prospective Quesnel Terrane.

Computer-aided methods for 3-D visualization of serial sections and thick biological specimens

1992 ◽  
Vol 50 (2) ◽  
pp. 1060-1061
Author(s):  
Mark Ellisman ◽  
Maryann Martone ◽  
Gabriel Soto ◽  
Eleizer Masliah ◽  
David Hessler ◽  
...  
Keyword(s):  
Alzheimer’S Disease ◽  
Alzheimer's Disease ◽  
Three Dimensional ◽  
Neuritic Plaque ◽  
Dimensional Structure ◽  
Data Sets ◽  
Molecular Physiology ◽  
Research Activities ◽  
Computer Aided ◽  
Dimensional Reconstruction

Structurally-oriented biologists examine cells, tissues, organelles and macromolecules in order to gain insight into cellular and molecular physiology by relating structure to function. The understanding of these structures can be greatly enhanced by the use of techniques for the visualization and quantitative analysis of three-dimensional structure. Three projects from current research activities will be presented in order to illustrate both the present capabilities of computer aided techniques as well as their limitations and future possibilities.The first project concerns the three-dimensional reconstruction of the neuritic plaques found in the brains of patients with Alzheimer's disease. We have developed a software package “Synu” for investigation of 3D data sets which has been used in conjunction with laser confocal light microscopy to study the structure of the neuritic plaque. Tissue sections of autopsy samples from patients with Alzheimer's disease were double-labeled for tau, a cytoskeletal marker for abnormal neurites, and synaptophysin, a marker of presynaptic terminals.

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