Variability of outcrop magnetic susceptibility and its relationship to the porphyry Cu centers in the Highland Valley Copper district
| Autor: | Robert G. Lee, Guillaume Lesage, Kevin Byrne, William A. Morris, Sarah A. Gleeson, Randy Enkin |
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| Rok vydání: | 2019 |
| Předmět: |
Outcrop
020209 energy Pluton Geochemistry Geology 02 engineering and technology 010502 geochemistry & geophysics 01 natural sciences Magnetic susceptibility Porphyry copper deposit Geochemistry and Petrology Batholith 0202 electrical engineering electronic engineering information engineering Economic Geology Geometric mean Vein (geology) 0105 earth and related environmental sciences Terrane |
| Zdroj: | Ore geology reviews |
| Popis: | The Highland Valley Copper porphyry Cu-(Mo) centers compose Canada’s largest porphyry Cu mining district, and are hosted in plutonic rocks of the Late Triassic Guichon Creek batholith in the Quesnel terrane, British Columbia. Here we evaluate the relationship between variations in magnetic susceptibility and alteration in order to define a footprint around the porphyry Cu centers using a district-scale dataset of 1610 minimally weathered outcrops and 11,432 magnetic susceptibility measurements. Statistical analysis of the outcrop-based measurements revealed changes in outcrop geometric mean magnetic susceptibility and the coefficient of variation (extent of variability in relation to the mean) are proportional to vein frequency and altered rock volume estimates. At a confidence interval of 95% and 9 degrees of freedom, the average standard error (uncertainty) of the geometric mean and coefficient of variation from 10 magnetic susceptibility outcrop measurements is 7.3% and 13.2%, respectively. Modeling of outcrop magnetic susceptibility data shows that domains of coefficient of variation of >0.3 extend 1–4 km away from the porphyry centers, whereas pronounced susceptibility lows of |
| Databáze: | OpenAIRE |
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