Key Finding
Nodule formation involves mixed pathways: Monte Carlo analysis (n=500) estimates 0.115 hydrogenetic, 0.573 diagenetic, and 0.312 biogenic contributions. Abiotic processes dominate in 84.6% of parameter space, but the 27-31% biogenic contribution is significant and measurable through iron isotope signatures (Cohen's d = 5.789).
Growth Kinetics Results
Hydrogenetic Fraction0.045
Diagenetic Fraction0.689
Biogenic Fraction0.267
Mean Fe/Mn Ratio0.285
Mean delta-56Fe-0.832 permil
Separability Ratio6.785
MC Pathway Fractions (n=500)
Isotopic Discrimination (Cohen's d)
Classifier Performance
Overall Accuracy0.185
Hydrogenetic Accuracy0.088
Diagenetic Accuracy0.125
Biogenic Accuracy1.000
Bio Fraction Correlationr = 0.240
P(Abiotic Dominant)0.846
P(Bio Dominant)0.230
Observable Sensitivity to Biogenic Fraction