Sr87/Sr86 Locality Match Checker
Actual87Sr/86Sroverlapindependentlocalrangeonly,not provenanceassignment/migration/localityidentity/uniquegeology. Actual independently identified specimens,matched units/taxon/cohort/source/edition/calibration and model applicability external;not individual identity,causation,diagnosis,absolute age certainty or validated forecast.
Description
A strontium isotope ratio can overlap an independently established local reference range without uniquely establishing provenance.
A strontium isotope ratio can overlap an independently established local reference range without uniquely establishing provenance.1
The range and specimen measurement need comparable analytical context.
When to use Sr87/Sr86 Locality Match Checker
Use this tool to apply the stated sr87/sr86 locality match checker operation with an explicit input and unit basis.
How to use Sr87/Sr86 Locality Match Checker and how it works
- Establish the measurement basis and units described above.
- Enter actualSr87Sr86Ratio, callerIndependentlyVerifiedLocalLowerRatio, callerIndependentlyVerifiedLocalUpperRatio and run the tool.
- Read result.overlapsCallerLocalRange, result.signedLowerMargin, result.signedUpperMargin using the output meanings below.
- If input is rejected, correct the stated type, range, ordering or alignment issue and rerun; review successful results under the declared convention.
| Input field | Meaning | Value type | Requirement |
|---|---|---|---|
| actualSr87Sr86Ratio | Sr87 sr86 ratio, on the basis specified in the algorithm. | number | required; finite; strictly positive; further conditions in the algorithm |
| callerIndependentlyVerifiedLocalLowerRatio | Independently verified local lower ratio, on the basis specified in the algorithm. | number | required; finite; strictly positive; further conditions in the algorithm |
| callerIndependentlyVerifiedLocalUpperRatio | Independently verified local upper ratio, on the basis specified in the algorithm. | number | required; finite; further conditions in the algorithm |
Require positive observed and lower ratios and an upper ratio at least the lower. Check inclusive range and return signed margins to both limits.
overlap = lower ≤ ratio ≤ upper Apply the declared units, ordering and branch conditions.
| Output field | Meaning | Value type |
|---|---|---|
| result | Object containing the declared output fields. | object |
| result.overlapsCallerLocalRange | True when the isotope ratio falls in the supplied inclusive range. | boolean |
| result.signedLowerMargin | Actual value minus lower bound, on the matching measurement scale. | number |
| result.signedUpperMargin | Upper bound minus actual value, on the matching scale. | number |
{
"input": {
"actualSr87Sr86Ratio": 0.71,
"callerIndependentlyVerifiedLocalLowerRatio": 0.7,
"callerIndependentlyVerifiedLocalUpperRatio": 0.72
},
"output": {
"result": {
"overlapsCallerLocalRange": true,
"signedLowerMargin": 0.010000000000000009,
"signedUpperMargin": 0.010000000000000009
}
}
}Limitations and assumptions
The output applies the declared operation to the values you supply. Establish the measurement basis, units, coefficients and any caller-selected rules before interpreting it. The tool does not independently collect or verify observations or decide whether a model or reference applies.
Supply explicit required fields with the documented types and dense aligned arrays. Unknown fields, wrong types and nonfinite numbers are rejected. Branch-specific constraints are explained above. A successful false boolean, negative signed difference, empty slice or unresolved tie is distinct from an input error. Very large inputs or outputs may be rejected by shared resource limits.
Alternative or Complementary methods
For a related operation, use Isotope Trophic Enrichment Step Adjuster. Nitrogen-isotope values can be adjusted by a separately established baseline and trophic enrichment per step.
For a related operation, use Brachiopod Shell Thickness to Environment Proxy Checker. Shell thickness can act as an environmental proxy only within a matched calibration and specimen context.
References
-
Sr87/Sr86 Locality Match Checker — tool.io
Similar or alternative tools
- Isotope Trophic Enrichment Step Adjuster
Nitrogen-isotope values can be adjusted by a separately established baseline and trophic enrichment per step.
- Brachiopod Shell Thickness to Environment Proxy Checker
Shell thickness can act as an environmental proxy only within a matched calibration and specimen context.