Volcanic Exhalation and Thermal Water Isotope Chemistry in Rabaul Caldera

Published research analyzes stable isotope ratios (D/H and O18/O16) and chemical compositions (Fe, Mn, Zn, anions, trace metals) of thermal waters and fumarolic exhalations in the Rabaul caldera, Papua New Guinea. The study investigates the origin of geothermal fluids, contrasting isotopic evidence for meteoric water mixing with chemical evidence previously interpreted as marine. Data was contributed by the Australian Ocean Data Network and the record was last updated in April 2026.

Use Cases

• Classify thermal water origin using D/H and O18/O16 isotope ratios relative to the meteoric water line.
• Model trace metal enrichment (Fe, Mn, Zn) in geothermal springs as a function of fluid temperature and host rock chemistry.
• Reconcile conflicting origin hypotheses by comparing anion ratio and trace metal content data with stable isotope groupings.
• Analyze the composition of low-temperature (100°C) fumarolic exhalations to assess the contribution of recycled meteoric water.

Strengths

• Data includes multiple measurement types: stable isotopes, anion ratios, and trace metal contents.
• Analysis covers distinct geographic areas within the caldera: Matupi Harbour, Sulphur Creek, Tavurvur, and Rabalankaia volcanoes.

Limitations

• Unknown sample size (row count) for the isotopic and chemical measurements.
• Primary data is presented within a published study, potentially limiting raw, machine-readable data availability.
• Temporal coverage for sample collection is not specified.

Provenance

Source

Australian Ocean Data Network.

Collection Method

Chemical and isotopic analysis of collected water and gas samples.

Time Range

null

Freshness

Record metadata was updated in April 2026, though the underlying study publication date is unknown.

Geography

Rabaul caldera, New Britain, Papua New Guinea.