CorStruth - Automated Analysis of HyLogger Data from the NVCL

9 December 2018
1. HyLogger-2 Data now on CorStruth                                                                                 
2. New notes Orthopyroxene library spectra and Channel Spectra                                   
 3. New HL-3 Holes: 38 from SA                                                                                              
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 argues our library needs more Fe-rich orthopyroxene/pigeonite spectra to model many mafic rocks in the NVCL database.
The second discusses rare, highly periodic patterns occasionally seen in VNIR/SWIR data. They are interpreted as Channel Spectra that arise from interference effects from thin layers. 

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