| Title | A gamma-ray spectrometric study of the footwall felsic volcanic and sedimentary rocks around Brunswick No. 6 massive sulphide deposit, northern New Brunswick |
| Download | Download (whole publication) |
| Author | Lentz, D R |
| Source | Eastern Canada and national and general programs/Est du Canada et programmes nationaux et généraux; by Geological Survey of Canada; Geological Survey of Canada, Current Research no. 1994-D, 1994 p.
135-141, https://doi.org/10.4095/193862 |
| Year | 1994 |
| Publisher | Natural Resources Canada |
| Document | serial |
| Lang. | English |
| Media | paper |
| Related | This publication is contained in Geological Survey of
Canada; Geological Survey of Canada; (1994). Eastern Canada and national and general programs, Geological Survey of Canada, Current Research no. 1994-D |
| Province | New Brunswick |
| NTS | 21P/04 |
| Area | Nepisiquit River |
| Lat/Long WENS | -66.0000 -65.5000 47.2500 47.0000 |
| Subjects | geophysics; igneous and metamorphic petrology; volcanic rocks; felsic volcanic rocks; igneous rocks; hydrothermal alteration; alteration; gamma-ray surveys; geophysical surveys; volcaniclastics;
pyroclastics; field relations; Brunswick No. 6 Mine |
| Illustrations | analyses; sketch maps |
| |
| Program | Canada-New Brunswick Cooperation Agreement on Mineral Development, 1990-1995 |
| Released | 1994 02 01 |
| Abstract | Hydrothermal alteration in the footwall to the Brunswick deposits is manifested by feldspar- destructive alteration coincident with modal increases in chlorite at the expense of sericite. This
phenomenon results in K depletion halos in the footwall to these deposits. In situ gamma-ray spectrometric measurements of the footwall rock outcrops around the Brunswick No. 6 deposit show that the exposed upper sequence of altered volcaniclastic
rocks (quartz-augen schist + footwall sedimentary rocks) have lower K contents (average 2.0 ± 0.3 wt.%) than the lower sequence of less-altered pyroclastic rocks (3.5 ± 0.3 wt.%). eU is variable throughout but less abundant in altered rocks. eTh is
variable in the upper volcaniclastic package due to sedimentary reworking or mass changes occurring during alteration. K/eTh ratios enhance the alteration trends by focusing on the relative change. Inexpensive rapid in situ gamma-ray spectrometric
analyses are useful in alteration and possibly chemostratigraphic analysis in the Bathurst Camp. |
| GEOSCAN ID | 193862 |
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