Upper Triassic Carbonate Rock Photographs and Mineralogical Analysis from Tengchong

51.8 MB of photographic and descriptive data documents the sedimentary characteristics of Upper Triassic carbonate rocks in the Tengchong Block, southwest China. The collection includes field photographs, photomicrographs, and stratigraphic column imagery from the Xianfengying section, created by researcher Yan Dong and published in April 2026. Figures detail specific rock types like oncolitic limestone and bioclastic limestone, alongside mineralogical features such as iron-bearing minerals and microbial structures.

Use Cases

• Classify carbonate rock types (e.g., oncolitic limestone, bioclastic limestone) from field and microscopic imagery using convolutional neural networks.
• Analyze mineralogical features like iron-bearing minerals, calcite veins, and clay minerals present in photomicrographs to infer depositional conditions.
• Correlate specific stratigraphic layers (e.g., Layer 4, Layer 8-1) with documented rock characteristics and grain types like ooids and bioclasts for sequence stratigraphy.
• Train models to identify and segment fossil components (e.g., gastropods, bivalves, coral fragments) within bioclastic limestone samples.
• Study the spatial distribution of features like trace fossils and breccia layers documented in field photographs to understand local geological history.

Strengths

• Includes high-resolution field and photomicrograph imagery for visual analysis of rock textures and minerals.
• Documents a specific, well-defined geological section (Xianfengying) with stratigraphic context across multiple Upper Triassic formations.
• Released under a permissive CC-BY-4.0 license, facilitating open reuse and modification.

Limitations

• Small scale at 51.8 MB, indicating a limited number of image samples rather than a large-scale image corpus.
• Lacks accompanying structured tabular data (e.g., quantitative measurements, sample coordinates) for statistical analysis.
• Temporal coverage is focused on a specific geological epoch (Upper Triassic) from a single location, limiting broader geographical or temporal comparisons.

Provenance

Source

Figshare repository, authored by Yan Dong.

Collection Method

Field photography and laboratory photomicrography of rock samples from the measured Xianfengying section.

Time Range

Upper Triassic period (approximately 237 million years ago).

Freshness

Last updated in April 2026, indicating recent publication.

Geography

Tengchong Block, southwest China, specifically the Xianfengying section.