Geological Mapping · mapping-4-19
LP4 clay-rich thin section
The LP4 thin section can substantiate a clay-rich rock only if imaging resolution and preparation permit matrix, silt grains, carbonate and alteration products to be distinguished.
SOURCE-LED TECHNICAL READING
Geological interpretation and evidential boundary
The LP4 thin section can substantiate a clay-rich rock only if imaging resolution and preparation permit matrix, silt grains, carbonate and alteration products to be distinguished. A very high fine-matrix proportion supports mudrock classification, but optical estimates should be described as semi-quantitative unless point counted, and clay mineral species cannot be confidently assigned from routine transmitted light alone. XRD would be the appropriate test for mineralogical composition. The analytical priority is to connect matrix abundance, lamination, cement and microfracturing to the field behaviour of the fine-grained Halang interval. Terminology should follow a consistent grain-size and fissility scheme rather than mixing petrographic and hand-specimen classifications.
- Source
- Private mapping source vault · geological evidence record
- Location in source
- PDF page 70
- Image quality
- Source scan
- Record ID
- mapping-4-19
