Abstract

Since the federation of Australia in 1901 Geoscience Australia, and its predecessor organisations, have amassed a significant collection of microscope slides of a variety of physical samples from across Australia, Antarctica, and adjacent regions. The extensive nature of the collection and the diverse and often remote nature of the source locations means that the cost of recreating the collection, if possible, would be $AU100Ms. The original samples were collected as part of either extensive government geological mapping programs or more specific scientific expeditions conducted for major Government initiatives. They are technically open to anyone (industry, educational institutions, the public), but are essentially unknown and almost impossible to access. Management of this collection was based on an aged card catalogue and ledger system developed in the pre-digital era. The aged management system, with increasing deterioration of the physical media, combined with loss of access to even some of the original contributors meant that rescue work was needed. Rescuing the collection made use of non-traditional means, including the extensive use of web-based citizen science and reference to a small number of onsite volunteers. Through essentially a volunteer effort, from a group more used to biology related items, the project has seen the transcription of some 40,000 sample metadata records (more than 2.5 times our current electronic holdings). This paper examines the process undertaken and advocates the approach that has made it successful. It promotes the value and benefits to Geoscience Australia, participating volunteers and potential users of the collection.

Highlights

  • For more than a century Geoscience Australia, and its predecessors (the Australian Geological Survey Organisation (AGSO) and the Bureau of Mineral Resources, Geology and Geophysics (BMR)), have been collecting rock samples from around the world, with a particular focus on Australia and the surrounding region

  • Traditional thin sections are made using a diamond saw to cut a thin sliver of rock, which is mounted on a glass slide and ground down until the sample is only 30 μm thick, and can be examined by a variety of techniques including plain polarized petrographic microscopes, reflection microscopes, electron microscopes and electron microprobes

  • The finished microscope slide is a useful aid in determining the mineralogy of the parent rock sample

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Summary

Introduction

For more than a century Geoscience Australia, and its predecessors (the Australian Geological Survey Organisation (AGSO) and the Bureau of Mineral Resources, Geology and Geophysics (BMR)), have been collecting rock samples from around the world, with a particular focus on Australia and the surrounding region. Many samples in the collection are irreplaceable and come from locations that are inaccessible and in some cases no longer exist From these samples over 250,000 thin section microscope slides ( called petrographic sections or thin sections) have been produced. The finished microscope slide is a useful aid in determining the mineralogy of the parent rock sample. Position-located, real world physical samples have a valuable role to play in the calibration of modern remotely sensed data sets, those that can provide information on the minerals present at each site and their formation. Throughout this paper we will use the term “thin section slides” to describe microscope slides that are prepared from individual rock samples

The Initial State
The Rescue Process
Identifying thin section slides within the area of interest
Metadata
Imaging sample submission cards and registers
Establishing a DigiVol ‘Expedition’
Running an expedition
Transcription process
Social aspects – capturing and keeping interest
Access and discovering the newly digitised data
3.10. Future developments
Discussion
Onsite
Findings
Working with the DigiVol volunteers
Conclusions
Full Text
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