Geochemical Constraints on the Genesis of the Scheelite Dome Intrusion-Related Gold Deposit, Tombstone Gold Belt, Yukon, Canada

J.L. Mair, R.J. Goldfarb, C.A. Johnson, Craig Hart, E.E. Marsh

Research output: Contribution to journalArticle

33 Citations (Scopus)

Abstract

The Scheelite dome intrusion-related gold deposit, western Selwyn basin, Yukon, is hosted in hornfelsed metasedimentary strata that lie adjacent to the exposed apices of a monzogranite to quartz monzonite plutonic complex of the mid-Cretaceous Tombstone-Tungsten magmatic belt, Tintina gold province, Alaska and Yukon. A variety of mineralization styles occur throughout a 10- x 3-km east-trending corridor and include reduced Au- and W-rich skarns, Au-, W- and Ag-Pb-Zn-Sb-rich quartz tension-vein arrays, and multiphase fault veins and isolated zones of Au-rich sericite-carbonate altered rock. Integrated U-Pb SHRIMP data for magmatic zircon and Ar-Ar data for magmatic and hydrothermal biotite indicate that gold mineralization occurred within 1 to 2 m.y. of magma emplacement.Fluid inclusion, oxygen isotope, and arsenopyrite geothermometry data indicate that hydrothermal minerals formed at depths of 6 to 9 kin over a temperature range from <300 degrees to > 550 degrees C. High-temperature Au-rich skarns formed at > 400 degrees C, whereas vein-hosted mineralization formed at 280 degrees to 380 degrees C. In skarns, Au is strongly associated with enrichments of Bi, Te, W, and As, whereas a variety of Au-rich veins occur, with As-rich (type I), and Te- and W-rich (type 2) end members. Silver-Pb-Zn-Sb veins are typically An poor and represent the latest and lowest temperature phase in the hydrothermal paragenesis.The fluid inclusion data indicate that all mineralization styles were formed from low-salinity (
Original languageEnglish
Pages (from-to)523-553
JournalEconomic Geology
Volume101
DOIs
Publication statusPublished - 2006

Fingerprint Dive into the research topics of 'Geochemical Constraints on the Genesis of the Scheelite Dome Intrusion-Related Gold Deposit, Tombstone Gold Belt, Yukon, Canada'. Together they form a unique fingerprint.

Cite this