# Dataset of the CO2-rich gas emissions in the Eastern Carpathians, Romania

## TL;DR

This paper presents a detailed dataset of CO2-rich gas emissions in Romania's Eastern Carpathians, combining field and lab measurements to study gas origins and geological processes.

## Contribution

The dataset offers high-resolution geochemical data from both volcanic and non-volcanic areas in the Eastern Carpathians, including in situ and lab analyses.

## Key findings

- The dataset includes CO2, CH4, and H2S measurements from 143 degassing sites in the Eastern Carpathians.
- Gas compositions and isotopic ratios were analyzed at 50 selected sites, providing insights into degassing processes.
- The dataset supports comparative studies and modeling of deep carbon fluxes in dormant volcanic and non-volcanic regions.

## Abstract

This dataset provides a comprehensive geochemical characterization of gases emitted across the Romanian segment of the Eastern Carpathians, including both volcanic and non-volcanic areas. It comprises in situ measurements of CO2, CH4, and H2S at 143 degassing sites, including dry vents, bubbling pools, drillings, and mineral springs, supplemented by gas-chromatographic analyses of major components (CO2, CH4, N2) and isotopic measurements (3He/4He, δ¹³C (CO2)) at 50 selected sites. The sampling strategy spans a N–S transect of the region, capturing both CO2- and CH4-rich emissions, and providing detailed coverage of dormant volcanic and non-volcanic geological settings.

Field measurements employed a portable Multi-GAS instrument with calibrated IR (for CO2 and CH4) and electrochemical (for H2S) sensors, ensuring high-quality in situ data. Laboratory analyses were conducted at Istituto Nazionale di Geofisica e Vulcanologia (INGV) Sezione Palermo, Italy and at HUN-REN Debrecen, Hungary, enabling robust characterization of gas compositions and isotopic ratios.

This dataset represents a high-resolution geochemical resource for the Romanian segment of the Eastern Carpathians, offering extensive information on gas compositions, noble gas signatures, and carbon isotopes. It can be reused by researchers to investigate degassing processes, gas origins, fluid migration, and tectonic controls in dormant volcanic and non-volcanic regions. Furthermore, it provides a reference for comparative studies with other global degassing systems and supports modelling of deep carbon fluxes from dormant volcanic and non-volcanic environments.