Geology Chemostratigraphy Carbon Isotope Excursion Calculator
Observed baseline-relative carbon isotope excursions and actual sampled zero-crossings, no named global-event correlation. Caller independently establishes matching units, evidence, method edition and applicability; output is not compliance, diagnosis, work-safety approval, geological identity or validated hazard prediction.
Description
An isotope excursion is a signed difference between observed values and an independently established baseline.
An isotope excursion is a signed difference between observed values and an independently established baseline.1
Zero crossings mark where the submitted linearly interpolated residual changes sign, not a unique stratigraphic event correlation. Use this tool to calculate chemostratigraphy carbon isotope excursion from the supplied measurements and assumptions.
When to use Geology Chemostratigraphy Carbon Isotope Excursion Calculator
Use this tool to calculate chemostratigraphy carbon isotope excursion from the supplied measurements and assumptions. Establish the measurement units, sampled interval, calibration or model edition and geological assumptions before entering data.
How to use Geology Chemostratigraphy Carbon Isotope Excursion Calculator and understand its results
- Establish the measurement units, sampled interval, calibration or model edition and geological assumptions before entering data.
- Enter sampleDepths, observedDelta13C, independentBaselineDelta13C, using the field meanings and rules below, then run the tool.
- Read signedExcursions, zeroCrossingDepths. Interpret the fields using their units, signs and evidence conventions below.
- If input validation fails, correct the reported field and run again. Before applying the result, check reference scope, model assumptions and any missing evidence or placeholder values.
| Input field | Meaning | Value type | Requirement |
|---|---|---|---|
| sampleDepths | Sample depths | list of number | Required |
| observedDelta13C | Observed delta13 c | list of number | Required |
| independentBaselineDelta13C | Independent baseline delta13 c | list of number | Required |
Enter strictly increasing sampled coordinates with aligned measured and independent baseline delta13C values. Subtract baseline from each measured value, then find every exact-zero knot and strict sign-change crossing under linear interpolation. Return signed residuals and crossing coordinates, without smoothing or event identification.
excursion_i=observed_i−baseline_i; crossings=piecewiseLinearZeros(coordinates,excursions) Use the exact units, boundary rules, ordering and missing-evidence conventions above.
| Output field | Meaning | Value type |
|---|---|---|
| signedExcursions | Signed Excursions; follow the units, sign, ordering and evidence convention stated above | list of number |
| zeroCrossingDepths | Zero Crossing Depths; follow the units, sign, ordering and evidence convention stated above | list of number |
{
"input": {
"sampleDepths": [
0,
1,
2
],
"observedDelta13C": [
1,
-1,
1
],
"independentBaselineDelta13C": [
0,
0,
0
]
},
"output": {
"signedExcursions": [
1,
-1,
1
],
"zeroCrossingDepths": [
0.5,
1.5
]
}
}Limitations and assumptions
Zero crossings mark where the submitted linearly interpolated residual changes sign, not a unique stratigraphic event correlation. Interpretation depends on the units, sampling scope and exact model described above.
All listed fields require explicit values. Unexpected fields, incorrect types, nonfinite numbers and sparse evidence arrays fail validation; the specific bounds and alignment requirements are stated above. Extremely large inputs or outputs can also be rejected. An input error is distinct from a successful result reporting false, no matches or missing evidence.
Alternative or Complementary methods
Use Geology Varve Thickness Calculator for this related task: A varve is an independently identified annual sedimentary layer or layer pair under the adopted counting convention.
Use Geology Biostratigraphy Zone Thickness Calculator when its separate inputs and assumptions fit the question: A biozone thickness can be bounded when both its base and top have independent coordinate intervals.
References
Similar or alternative tools
- Geology Varve Thickness Calculator
A varve is an independently identified annual sedimentary layer or layer pair under the adopted counting convention.
- Geology Biostratigraphy Zone Thickness Calculator
A biozone thickness can be bounded when both its base and top have independent coordinate intervals.