ELECTRON PROBE MICROANALYSIS (EPMA) AND SECONDARY ION MASS SPECTROMETRY (SIMS): MAJOR AND TRACE ELEMENT AND S ISOTOPE ANALYSIS OF SULPHIDE MINERALS

摘要

Irish Zn-Pb deposits are a type of carbonate-hosted mineralisation, typically occurring adjacent tonormal faults. Ore deposition occurred as Lower Carboniferous limestones were replaced bysulphides, triggered primarily by fluid mixing between hydrothermal fluids and basinal brines. The Lisheen deposit (Fig. 1) of the southern Irish Orefield consists of several strataboundorebodies that are strongly controlled by an extensional, left-stepping, ramp-relay fault array .The Island Pod (Fig. 1) is a small, satellite body consisting principally of pyrite, sphalerite andgalena. Despite its distance from suspected feeders, the Island Pod hosts some of the best qualityore at Lisheen and displays major lateral chemical variation on a small scale (<10 m). The IslandPod also exhibits a weaker structural control than elsewhere in the deposit.