Quantified, multi-scale X-ray fluorescence element mapping using the Maia detector array: application to mineral deposit studies

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• 作者：Louise A. Fisher ; Denis Fougerouse ; James S. Cleverley…
• 关键词：Synchrotron ; X ; ray fluorescence microscopy ; Orogenic gold ; Sulphide ; Zonation
• 刊名：Mineralium Deposita
• 出版年：2015
• 出版时间：August 2015
• 年：2015
• 卷：50
• 期：6
• 页码：665-674
• 全文大小：5,790 KB
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• 作者单位：Louise A. Fisher (1)
  Denis Fougerouse (2)
  James S. Cleverley (1)
  Christopher G. Ryan (3)
  Steven Micklethwaite (2)
  Angela Halfpenny (1)
  Robert M. Hough (1)
  Mary Gee (2)
  David Paterson (4)
  Daryl L. Howard (4)
  Kathryn Spiers (4)
  
  1. CSIRO Mineral Resources Flagship, PO Box 1130, Bentley, WA, 6102, Australia
  2. Centre for Exploration Targeting, The University of Western Australia, Crawley, WA, Australia
  3. CSIRO Mineral Resources Flagship, Gate 5, Normanby Road, Clayton, VIC, Australia
  4. XFM Beamline, Australian Synchrotron, 800 Blackburn Road, Clayton, VIC, Australia
  
• 刊物类别：Earth and Environmental Science
• 刊物主题：Earth sciences
  Geology
  Mineral Resources
  Mineralogy
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1432-1866

文摘

The Maia large solid-angle detector array and imaging system is capable of collecting high-resolution images of up to ?00?M?pixels in size with dwell times of less than 0.2?ms per pixel and thus it is possible to document variation in textures associated with trace element chemistry by collecting quantified elemental maps of geological samples on the scale of entire thin sections in a short time frame (6-?hr). The analysis is nondestructive and allows variation to be recognised on a centimetre scale while also recognising zonations at the micron scale. Studies of ore systems require microanalysis of samples to collect information on mineral chemistry in order to understand physiochemical conditions during ore genesis and alteration. Such studies contribute to the debate on whether precious metals are remobilised or introduced in multiple hydrothermal events. In this study we demonstrate the microanalytical capabilities of the Maia large solid-angle detector array and imaging system on the X-ray fluorescence microscopy beamline at the Australian Synchrotron to provide data for these studies. We present a series of case studies from orogenic gold deposits that illustrate the power of the Maia detector for constraining chemical zonations in sulphides and associated alteration minerals, which can be used to decipher ore-forming processes associated with gold deposition. A series of large-area (<7?cm2) elemental maps were collected with 2 to 4 μm pixel size using the Maia detector array. The data was processed using the GeoPIXE?software package which allows variation in trace, minor and major element chemistry to be visualised in element maps. These maps are used to target further investigation with bulk spectra extracted and fitted for specific?mineral grains and transects drawn through regions of interest. Analysis using the Maia detector offers a complementary method to map element distribution in geological samples that is both relatively fast and has a low detection limit for many elements of interest.