Geological Application of Graptolite Reflectance
| July 29, 2023 | Filled under Com II |
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established in 2023 New Delhi, India
Conveners
Members
Priyanthi Chopra
Dr. Ye Wang
Introduction
The working group on Geological Application of Graptolite Reflectance was established in the 2022 ICCP New Delhi conference. Graptolite reflectance (GR) is the most significant thermal index for establishing thermal maturation in pre-Devonian rocks, and is needed to integrate this work into the efforts of the ICCP.
Fig. 1 Photomicrograph showing the binary structure of graptolite periderm in well-preserved fossils in sample EST3008 under reflected white-light.
Objectives
At the ICCP Meeting in New Delhi, several potential objectives were put forward, including:
1). General round robin exercises on samples with well-identifiable graptolite to measure reflectance values (Fig. 1 and 2),
2) Testing the graptolite reflectance anomaly from one sedimentary basin (Zheng et al., 2022),
3). Investigate the relationship between graptolite reflectance and other geochemical maturity indicators.
The new WG will be cooperating with the Classification and Terminology of Zooclasts in old sediments WG of Commission I to enable successful activities within both WGs.
With the work from all the participants and results comparison, we aim to standardize the geological application of graptolite reflectance.
Fig. 2 Granular graptolite (GG) and non-granular graptolite (NGG) observed in the same microscopic view.
Related References
Zheng, X., Schovsbo, N.H., Luo, Q., Wu, J., Zhong, N., Goodarzi, F. and Sanei, H., 2022. Graptolite reflectance anomaly. International Journal of Coal Geology, 261, p.104072.
Activities
2022 Activities
- ICCP Meeting, New Delhi – Proposal for Graptolite WG in Commission II
- Proposal to establish new ICCP WG in the Commission II – ICCP News No. 84 December 2022.
2023 Activities
- Preparation of 2023 Graptolite WG round robin exercise on graptolite from Ottenby Alum shale, Öland, Sweden.