Trace element characteristics and S isotopic compositions of pyrite in the Howard's Pass Zn-Pb District, Selwyn Basin, Yukon / M. Gadd, D. Layton-Matthews, J. Peter and S. Paradis.: M183-2/7511E-PDF

"The Howard's Pass Zn-Pb district (HPD) is a sedimentary exhalative (SEDEX) district comprising 14 Zn-Pb deposits that contain an estimated 400Mt of Zn and Pb grading at 5% and 2%, respectively. The HPD is located within the Selwyn Basin, a prolific metallogenic province that is primarily known for its world-class Zn-Pb (±Ag ±Ba) SEDEX deposits. Pyrite is a minor but ubiquitous component of the sulfide mineralogy, which is dominantly comprised of sphalerite and galena, and is also present in the host carbonaceous mudstones in the HPD. We have used electron probe microanalysis-wavelength dispersive spectrometry (EPMA-WDS), laser ablation-inductively couple plasma mass spectrometry (LA-ICP-MS) and secondary ion mass spectrometry (SIMS) to determine the major element chemistry, trace element chemistry and S isotopic compositions, respectively, of the different textural varieties of pyrite throughout the stratigraphic succession that hosts SEDEX mineralization at the HPD. Petrographic, LA-ICPMS and EPMA-WDS data provide information on the composition and relative timing of depositional, diagenetic and metamorphic fluids responsible for multiple generations of pyrite formation. SIMS data reveal trends in the sulphur isotopic compositions of pyrites and offer new insight into the redox conditions of the ambient marine bottom waters in which framboidal pyrites were precipitated. These data suggest that the timing of hydrothermal SEDEX fluids were not coeval with sedimentation, but are synchronous with diagenesis"--Rationale and purpose.

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