Data · dataset · 2025
A dataset on dolomite abundance, geochemistry, and U-Pb dating from a Triassic evaporative platform in the Sichuan Basin, SW China
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Table 1 presents 20 XRD analyses documenting the mineral compositions of the Middle Triassic borehole interval.
Description
Within the evaporite-dominated interval, the volume fractions of evaporite and dolomite range between 70–90% and 5–15%, respectively. Table 2 summarizes the isotopic results (δ26Mg, δ44Ca, δ34S, 87Sr/86Sr) for the same interval.
Carbonates show a rough anti-correlation between δ26Mg and δ44Ca isotopic compositions. δ26Mg exhibits an upward increasing trend stratigraphically (‒2.31‰ to ‒1.21‰; n=28), while δ44Ca shows a corresponding decreasing trend (‒1.28‰ to ‒0.28‰; n=13). Anhydrite samples (n=10) display a narrow δ34S isotopic range of 29.3‰ to 26.2‰, averaging 27.8 ± 1.2 ‰.
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Carbonate (n=12) exhibit 87Sr/86Sr ratios within a tight range of ~0.70825 to 0.70855. Table 3 provides U-Pb dating results for eight dolomites: two dates are from the Middle Triassic and six are from the Lower Triassic borehole samples. All dolomites yielded relative high-quality isochrons, with minor uncertainties (3.1 to 11.7%, average at ~6.5%) and limited scatter in data points (low MSWD values of 0.25 to 1.1, average at 0.82).
Lower Triassic dolomites (n=6) yield U-Pb ages ranging from 209 to 237 Ma, averaging 224 ± 13 Ma, which aligns with the older U-Pb age (226 ± 14 Ma) of the Middle Triassic dolomite. One Middle Triassic dolomite date provides a significantly younger age of 94 ± 11 Ma. The reconstructed 238U/206Pb values for all dolomites range from 0.9 to 10.7, with an average of 4.7.
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Where it is published
- DOI doi.org/10.57760/sciencedb.20286 ↗
DOI / persistent id · from scidb cn
Catalogue records · 1
- OAI-PMH record scidb.cn/oai?verb=GetRecord&metadataPrefix=oai_dc&identifier=10.57760%2… ↗
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Topics
- From keywords
- Earth & Environmental Science · Engineering · Humanities · Life Sciences · Social Science
- Inferred from text
- Geochemistry 75% · Tabular 65%
Provenance · 1 source records, 12 field assertions
| Source | Key | Last seen | Raw |
|---|---|---|---|
| ScienceDB | 10.57760/sciencedb.20286 | 10 d ago | JSON v1 |
| Field | Assertion | Extractor | Evidence |
|---|---|---|---|
| access_level | source · scidb cn | connector:scidb_cn@1.0.0 | |
| concepts[field].anzsrc:group:3703 | enrichment · scidb cn | taxonomy-embedding@1.0.0 | title+keywords+description (75%) |
| concepts[field].local:field:earth-environmental | mapping · scidb cn | connector:scidb_cn@1.0.0 | |
| concepts[field].local:field:engineering | mapping · scidb cn | connector:scidb_cn@1.0.0 | |
| concepts[field].local:field:humanities | mapping · scidb cn | connector:scidb_cn@1.0.0 | |
| concepts[field].local:field:life-sciences | mapping · scidb cn | connector:scidb_cn@1.0.0 | |
| concepts[field].local:field:social-science | mapping · scidb cn | connector:scidb_cn@1.0.0 | |
| concepts[modality].local:modality:tabular | enrichment · scidb cn | keyword-concept-rules@1.0.0 | title+description (65%) |
| description | source · scidb cn | connector:scidb_cn@1.0.0 | /metadata/dc/description |
| license_text | source · scidb cn | connector:scidb_cn@1.0.0 | |
| publication_date | source · scidb cn | connector:scidb_cn@1.0.0 | |
| title | source · scidb cn | connector:scidb_cn@1.0.0 | /metadata/dc/title |