Abstract:In Mono Lake, concentrations of 3 He and 4 He are greater than atmospheric equilibrium values, indicating a subsurface helium source. This assertion is supported by vertical concentration profiles that show maximum ␦ 3 He values (ϩ68%) occurring within the pycnocline. The slope of the regression between 3 He and 4 He concentrations is near 2.8 R a (R a is the atmospheric helium isotope ratio), indicating that the subsurface source has a component of mantle helium. Hydrothermal springs and gas vents from Paoha … Show more
“…Gas from the springs on Paoha Island was dominated by CH 4 with elevated concentrations of C 2 -C 6 hydrocarbons but contained only~3% CO 2 . Clark and Hudson (2001) report a R C /R A of 2.7 for two samples from this hot spring area.…”
Section: Gas Chemistrymentioning
confidence: 88%
“…The very high He concentrations in these gases mainly reflect CO 2 loss, since the spring and lake waters through which the bubbles rise are alkaline fluids that convert CO 2 into dissolved carbonate species. The few percent of residual CO 2 in the hot-spring gases provides little information on magmatic carbon input, but the reported 3 He/ 4 He value for the hot springs of 2.7 R A (Clark and Hudson, 2001) demonstrates a magmatic gas component.…”
Section: Magmatic Carbon Input To Mono Lakementioning
“…Gas from the springs on Paoha Island was dominated by CH 4 with elevated concentrations of C 2 -C 6 hydrocarbons but contained only~3% CO 2 . Clark and Hudson (2001) report a R C /R A of 2.7 for two samples from this hot spring area.…”
Section: Gas Chemistrymentioning
confidence: 88%
“…The very high He concentrations in these gases mainly reflect CO 2 loss, since the spring and lake waters through which the bubbles rise are alkaline fluids that convert CO 2 into dissolved carbonate species. The few percent of residual CO 2 in the hot-spring gases provides little information on magmatic carbon input, but the reported 3 He/ 4 He value for the hot springs of 2.7 R A (Clark and Hudson, 2001) demonstrates a magmatic gas component.…”
Section: Magmatic Carbon Input To Mono Lakementioning
“…2). The 3HefHe ratio has been employed as an indication of a mantle component (e.g., Sano et al 1990;Collier et al 1991;Giggenbach et al 1991;Igarashi et al 1992;Kipfer et al 1994;Aeschbach-Hertig et aL 1996bClark and Hudson 2001). In the lakes studied, the 3HefHe ratio varies between 7.4xl0-6 and 10.3xlO-6 (Table 5).…”
Section: Noble Gases From the Earth's Mantlementioning
confidence: 99%
“…1994;Aeschbach-Hertig et aI. 1996bClark and Hudson 2001). Because typical mantle helium isotope ratios (about IQ-5, e.g., Mamyrin and Tolstikhin 1984) are much larger than R m and Re q , the mantle-derived 3He may become the dominant 3He-component, rendering it difficult or even impossible to calculate 3Hetri.…”
“…The isotope-based approach is now popular for the assessment of the hydrological and chemical budgets of lakes (Clark and Hudson, 2001;Gibson et al, 2002). Motz et al (2001) evaluated the annual groundwater output or leakage to an aquifer, distributed below the lake basin, by assessing the hydrological budget of a lake and the variation in the surrounding groundwater level.…”
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.