The Acropolitan - v. 8, no. 5

In this issue...Dr. A. E. Koenig, Magma Yearbook, Montana School of Mines Museum, M whitewash, Commencement, Anderson-Carlisle Technical Society, Gamer's Cafe

The Amplifier - v. 3, no. 4

In this issue...Dr. Van Pelt, Anderson-Carlisle Society, Rose Garden Party, Main Hall, Gordon Parker, Magma Yearbook, Berkley Open Pit, Malmstrom Air Force Base

The Amplifier - v. 8, no. 6

In this issue...Sylvia White, Speed Skating, President Kennedy, St. John's Church, Mineral Club, Magma Yearbook, Honor roll, Montana Power Company

The Amplifier - v. 8, no. 7

In this issue...Magma Yearbook, Marvin Senne, Continental Oil Company, NASA, Circle K Club, Mine Rescue training, Walter Mitty, International Club, Stu Stadler

The Amplifier - v. 8,(a-10) no. 10

In this issue...Library, Constitution, fraternities, Continental Oil Company, Circle K Club, Mineral Club, Ed Simonich, Geologists, Montana Power Company, hayride party

The Amplifier - v. 12, no. 3

In this issue...Business Management, US Geological Survey, Finlen Hotel, Magma Yearbook, Copper Guard, Somewhere Else Coffee House, Marcus Daly Statue

The Amplifier - v. 13, no. 1

In this issue...Homecoming, Intramural Football, Cheerleaders, Poetry, Yellowstone Park, Snowflake-Springs, Karst Ranch, Butte Symphony, Surveying

The Amplifier - v. 13, no. 2

In this issue...Faculty Women's Club, Miss Montana, Mining Museum, Climbing Club, NASA, Butte Civic Center, Oredigger Football, Mrs. Loretta Peck, Library Remodel

The Amplifier - v. 14, no. 11

In this issue...Copper Guards, International Club, Magma Yearbook, Astrophysics, Roger Pierce, Ed Simonich, Mike Mansfield, M Club, Income Tax, Biology Department

Magma 1975

In this issue...Honors Convocation, Students, M Days, M Day Smoker, Sports, Montana Bureau of Mines and Geology, Awards, Cheerleaders

Magma 1970

In this issue...Tech After Hours, Students, Sports, Fraternities, Student Wives, Concerts, E Days, M Days, President Koch, Student Council

Magma 1995

In this issue...Graduates, M-Days, Sports, Clubs, Students, Faculty, Student Life, Mining Team, Intramurals

Magma 1965

In this issue...Engineers' Creed, Alumni Stadium, Library, Graduates, Sports, Prom, Hootenany, M Day, Clubs, Boosters, Students

Magma 1960

In this issue...Faculty, Graduates, Magma Staff, Hall Council, E Day, M Day, Sports, Orediggers, Around Campus, Boosters, Student Life

Chalcophile element geochemistry of the Boggy Plain Zoned Pluton, southeastern Australia : a S-saturated barren compositionally diverse magma

The behavior of the platinum group elements (PGE) and Re in felsic magmas is poorly understood due to scarcity of data. We report the concentrations of Ni, Cu, Re, and PGE in the compositionally diverse Boggy Plain zoned pluton (BPZP), which shows a variation of rock type from gabbro through granodiorite and granite to aplite with a SiO2 range from 52 to 74 wt %. In addition, major silicate and oxide minerals were analyzed for Ni, Cu, and Re, and a systematic sulfide study was carried out to investigate the role of silicate, oxide, and sulfide minerals on chalcophile element geochemistry of the BPZP. Mass balance calculation shows that the whole rock Cu budget hosted by silicate and oxide minerals is <13 wt % and that Cu is dominantly located in sulfide phases, whereas most of the whole rock Ni budget (>70 wt %) is held in major silicate and oxide minerals. Rhenium is dominantly hosted by magnetite and ilmenite. Ovoid-shaped sulfide blebs occur at the boundary between pyroxene phenocrysts and neighboring interstitial phases or within interstitial minerals in the gabbro and the granodiorite. The blebs are composed of pyrrhotite, pyrite, chalcopyrite, and S-bearing Fe-oxide, which contain total trace metals (Co, Ni, Cu, Ag, Pb) up to ~16 wt %. The mineral assemblage, occurrence, shape, and composition of the sulfide blebs are a typical of magmatic sulfide. PGE concentrations in the BPZP vary by more than two orders of magnitude from gabbro (2.7–7.8 ppb Pd, 0.025–0.116 ppb Ir) to aplite (0.05 ppb Pd, 0.001 ppb Ir). Nickel, Cu, Re, and PGE concentrations are positively correlated with MgO in all the rock types although there is a clear discontinuity between the granodiorite and the granite in the trends for Ni, Rh, and Ir when plotted against MgO. Cu/Pd values gradually increase from 6,100 to 52,600 as the MgO content decreases. The sulfide petrology and chalcophile element geochemistry of the BPZP show that sulfide saturation occurred in the late gabbroic stage of magma differentiation. Segregation and distribution of these sulfide blebs controlled Cu and PGE variations within the BPZP rocks although the magma of each rock type may have experienced a different magma evolution history in terms of crustal assimilation and crystal fractionation. The sulfide melt locked in the cumulate rocks must have sequestered a significant portion of the chalcophile elements, which restricted the availability of these metals to magmatic-hydrothermal ore fluids. Therefore, we suggest that the roof rocks that overlay the BPZP were not prospective for magmatic-hydrothermal Cu, Au, or Cu–Au deposits.