The Sensitive High Resolution Ion Micro Probe (SHRIMP) IIe is a high precision Secondary Ion Mass Spectrometer (SIMS). Ion microprobes make in situ isotopic and chemical 'surface' analysis of solid targets by bombarding the sample with an ion beam with a diameter of several microns typically employing Kohler focussing. The high mass resolution of SHRIMP IIe is achieved by the use of double-focussing mass spectrometer (simultaneous energy and mass refocussing) with a very large turning radius of Magnet and Electrostatic Analyser. SHRIMP has many applications: zircon dating in copper-uranium-gold-silver deposits, uranium-lead dating of sulphur in the sulphide minerals that form metal ores, the isotopic composition of sulphur in the giant base metal ore bodies. With the addition of an optional cesium gun rather than the standard duoplasmatron, the SHRIMP IIe excels in the analysis of oxygen. Analysis of non-conductive samples is assisted with the optional electron gun for charge neutralisation.
SHRIMP A was commissioned in 1993 following a five year effort to raise the fund by the three partners in the SHRIMP laboratory:
Geological Survey of Western Australia
University of Western Australia
A second SHRIMP was commissioned in 2002 to accommodate the high workload of this sought after instrument.
At the JdLC the SHRIMP laboratory specialises in the precise, high age resolution, U-Th-Pb geochronology of accessory minerals. In addition the routine analysis of zircon, the lab also regularly analyses monazite, titanite, baddeleyite, apatite, rutile, allanite, xenotime, cassiterite, opal perovskite and uraninite. In addition to standard geochronology, depth profiling and trace element analysis provide a wealth of extra information on geological settings, including Ti-in-zircon thermometry and rare earth element (REE) analysis. The staff at the SHRIMP laboratory provide support for all stages of the analytical process from sample preparation to interpretation of isotopic and geochemical data. Our unique ‘autorun’ software allows around-the-clock analysis maximizing data production.