Helium and carbon isotope systematics of cold “mazuku” CO2 vents and hydrothermal gases and fluids from Rungwe Volcanic Province, southern Tanzania

Barry, Peter H.; Hilton, David R.; Fischer, Tobias P.; Moor, J. Maarten de; Mangasini, F.; Ramírez, Carlos

doi:10.1016/j.chemgeo.2012.07.003

Cited by 120 publications

(83 citation statements)

References 76 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The isotopic composition of δ 13 C-CO 2 , 3 He/ 4 He, and CO 2 / 3 He ratios clearly suggests the presence of an active degassing mantle, similarly to other geothermal fields in the EARS (e.g., Darling et al, 1995;Barry et al, 2013;Darrah et al, 2013).…”

Section: Discussionmentioning

confidence: 99%

Geothermal potential and origin of natural thermal fluids in the northern Lake Abaya area, Main Ethiopian Rift, East Africa

Minissale

Corti

Tassi

et al. 2017

Journal of Volcanology and Geothermal Research

View full text Add to dashboard Cite

In this study, the occurrence, chemical composition, origin and geothermal significance of thermal springs and fumaroles naturally discharging in the area located north of the Lake Abaya (western margin of the Main Ethiopian Rift, East Africa) are reviewed in relation with recent tectonics. All thermal springs showed a dominantly Na-HCO 3 composition, consistent with observations dating from at least 1972, and most of them displayed a narrow range of δD and δ 18 O isotopic compositions for water similar to regional meteoric origins. These observations suggest that water-rock interaction processes occur in all aquifers and dominate the contributions of water that actively circulate within thermal fluids, and also suggest a similar elevation of groundwater recharge throughout the study area. Most of the thermal springs are dominated by a CO 2 -rich gas phase and discharge along the active faults bordering the western edge of the Main Ethiopian Rift valley. The δ 13 C values of CO 2 and the 3 He/ 4 He isotopic ratios are consistent with the presence of mantle-derived fluids similar to what is observed in many other areas along the kinematically active African Rift, especially within Ethiopia. The application of geothermometric techniques in the liquid and the gas phases suggests the presence of a deep reservoir in which the fluids equilibrated at a maximum temperature of approximately 180°C. Additionally, the presence of fumaroles at boiling temperatures and water/mud boiling pools in several places suggests that the geothermal reservoir is positioned at a relatively shallow depth and likely located in the western side of the study area. The analysis of data collected throughout time reveals that the waters of Lake Abaya have experienced an increase in salinity of 20% paralleled contemporaneously with a decrease in pH and δ 18 O and δD of water in the last 40 years; these changes do not appear to be related to climate changeinduced increases in temperature or evaporation at the global scale.

show abstract

Section: Discussionmentioning

confidence: 99%

Geothermal potential and origin of natural thermal fluids in the northern Lake Abaya area, Main Ethiopian Rift, East Africa

Minissale

Corti

Tassi

et al. 2017

Journal of Volcanology and Geothermal Research

View full text Add to dashboard Cite

show abstract

“…Chiodini et al 2004;Ray et al, 2009;Pinti et al, 2011;Barry et al, 2013;Italiano et al 2014;Marrero-Diaz et al 2015;Benavente et al 2016;Birke et al, 2016). Due to the geological variety of the Eastern Carpathians and Transylvanian Basin, wide range of volatiles can be produced which interact with the infiltrating water.…”

Section: Discussionmentioning

confidence: 99%

“…Recent studies show the role of dissolved gases in active tectonic settings, volcanic and non-volcanic areas (Sano et al, 1998(Sano et al, , 2004Hilton et al, 2002;Shaw et al, 2003;Chiodini et al 2004Chiodini et al , 2011Yang et al, 2005;De Leeuw et al, 2007;Italiano et al 2009Italiano et al , 2014Ray et al, 2009;Ohba et al, 2010;Pinti et al, 2011;Barry et al, 2013;Sano and Fischer, 2013;Marrero-Diaz et al 2015;Inguaggiato et al 2016;Benavente et al 2016;Birke et al, 2016;). Venting of highly mineralized (TDS>1000 mg/L) sparkling groundwater is a common feature along the Eastern Carpathians making the area an important water resource for Romania.…”

Section: Introductionmentioning

confidence: 99%

Geochemistry of dissolved gases from the Eastern Carpathians - Transylvanian Basin boundary

et al. 2017

View full text Add to dashboard Cite

We show the results of a study on the volatiles dissolved in mineral waters discharged over a 200 km-long transect along the Rodna-Bârgău area and Călimani-Gurghiu-Harghita volcanic chain (Eastern Carpathians, Romania terms of mixings among different gas sources feeding the groundwater and the contemporary occurrence of gaswater interactions like degassing and deposition of carbonates, affecting the circulating waters after their infiltration.

show abstract

“…Helium isotopes, CO 2 / 3 He ratios, and δ 13 C-CO 2 values are generally known to be influenced by gradual addition of radiogenic 4 He and CO 2 from crustal rocks with distance from the crater (Sano et al, 1998a;Barry et al, 2013), with 3 He/ 4 He and δ 13 C-CO 2 decreasing and CO 2 / 3 He increasing with distance. However, in the case of dissolved gases from hot springs, high CO 2 / 3 He ratios can also reflect the solubility difference between CO 2 and He (Marty et al, 1989;Sano et al, 1998a).…”

Section: Crustal Contamination and Elemental/isotopic Fractionationmentioning

confidence: 98%

Effect of the volcanic front migration on helium, nitrogen, argon, and carbon geochemistry of hydrothermal/magmatic fluids from Hokkaido volcanoes, Japan

et al. 2015

View full text Add to dashboard Cite

Helium and carbon isotope systematics of cold “mazuku” CO2 vents and hydrothermal gases and fluids from Rungwe Volcanic Province, southern Tanzania

Cited by 120 publications

References 76 publications

Geothermal potential and origin of natural thermal fluids in the northern Lake Abaya area, Main Ethiopian Rift, East Africa

Geothermal potential and origin of natural thermal fluids in the northern Lake Abaya area, Main Ethiopian Rift, East Africa

Geochemistry of dissolved gases from the Eastern Carpathians - Transylvanian Basin boundary

Effect of the volcanic front migration on helium, nitrogen, argon, and carbon geochemistry of hydrothermal/magmatic fluids from Hokkaido volcanoes, Japan

Contact Info

Product

Resources

About