CorStruth - Automated Analysis of HyLogger Data from the NVCL

7 January 2019
1. HyLogger-2 Data now on CorStruth                                                                                 
                                          2. New notes on Complex Quartz/Kaolinite  Scattering and Uranium Mapping                                                        
    3. New HL-3 Holes: 18 from NSW                                                                                             
The HyLogger-2 holes for all states are now on CorStruth. These are holes that were acquired before the advent of HyLogger-3s and have not been remeasured yet with the newer instrument. HyLogger-2 data has no TIR measurements there is a new product format for the PNG files that CorStruth produces. This format is shown here for comparison with the HL3 version opposite.   A4-format PNG files are available now. Scrollable images and CSV files will come later.

Two new notes are available:

The first deals with the interpretation of complex spectra that can occur with mixtures of quartz and kaolinite. I suggest that these spectra arise when kaolinite and/or quartz exists as optically thin material on optically thick quartz and develop a non-linear model that explains the effects that are seen. 
The second documents some results from a MOMA that uses a scalar that responds when the features around 1125 nm and 1508 nm are both present. These two features are thought to relate to the presence of uranium minerals. The results are available on CorStruth as part of the REE MOMA.

The current CorStruth products are:

Interpretations (like the one opposite) suitable for A4 presentation with variable bin sizes.
Browser-based scrollable images with a standard bin size of 0.25 m. (e.g. here)
Downloadable CSV files of TSA+ and jCLST interpretations binned at 1 m intervals.
Mineral Occurrence Maps (MOMA's) of various minerals identified with the NVCL data
Notes (sometimes wonkish) on items of  possible interest for NVCL users (index here)

There are three ways to access the interpretation images...more 

CorStruth's purpose is to provide automatic interpretations of the HyLogging data from every dataset acquired as part of the AuScope National Virtual Core Library (NVCL) program. The results are free for you to copy but remember that they have been produced by automatic algorithms which will make mistakes. In this regard make sure you read the notes under Cautions.

The NVCL program is a team effort and thanks are due to everyone involved  - both individuals and organizations. And here most of them are at the 2017 NVCL Workshop in Sydney.

                                                                                                          Andy Green

Useful information

Improving the Interpretation of HyLogger Data Using XRF
Understanding the plots
Why Are the SWIR and TIR Results Different?
What is TSA+
What is jCLST?
Active Mineral List
USGS Resampled Spectra
State HyLogger Links: NSW, NT, Qld, SA, Tas, WA