Carbon-14 study of groundwater in the sedimentary rocks at the Tono study site, central Japan

Iwatsuki, Teruki; Xu, Sheng; Mizutani, Yoshihiko; Hama, Katsuhiro; Saegusa, Hiromitsu; Nakano, Kazunori

doi:10.1016/s0883-2927(00)00074-3

Cited by 28 publications

(15 citation statements)

References 19 publications

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“…From their oxygen and hydrogen isotopic compositions, the groundwaters from the TH boreholes and DH-3 are interpreted to be of meteoric origin (Iwatsuki et al 2000(Iwatsuki et al , 2001. Therefore, the groundwaters from these boreholes initially had the same 3 He/ 4 He ratio as air-saturated water (1.38 ϫ 10 Ϫ6 : Benson and Krause 1980).…”

Section: Helium and Neon Isotopesmentioning

confidence: 99%

“…From a hydrological standpoint, Yusa et al (1993) indicated that groundwaters in the sedimentary rocks around the Tono mine were divided into two aquifers by a low-permeability layer. Iwatsuki et al (2001) performed hydrogeological groundwater flow modeling, which took into account the topographical geometry and the geological structure. The result showed that groundwater infiltrated vertically from the surface in the upper sedimentary rocks.…”

Section: Helium and Neon Isotopesmentioning

confidence: 99%

“…In the Tono research area, central Japan, extensive hydrogeological and geochemical studies have been carried out (Yusa et al 1993;Iwatsuki and Yoshida 1999;Iwatsuki et al 2000Iwatsuki et al , 2001, and groundwaters from both sedimentary rocks and granite (up to about 1000 m in depth) can be collected from existing boreholes and from boreholes currently being drilled. To investigate the applicability of dissolved He in groundwater to groundwater flow, especially in fractured granite, the Tono research area was selected as the test field and the dissolved He isotopic ratios and He and Ne concentrations were analyzed for groundwaters from both sedimentary rocks and fractured granite.…”

Section: Introductionmentioning

confidence: 99%

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Dissolved helium distribution in deep groundwaters from the Tono area, central Japan: a tool for tracing groundwater flow in fractured granite

Morikawa¹

2004

Limnology

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The helium isotopic composition of groundwater collected from boreholes was measured in the Tono area from up to 840 m underground. The 3 He/ 4 He and 4 He/ 20 Ne ratios ranged from 9.1 ϫ 10 Ϫ8 to 1.48 ϫ 10 Ϫ6 and from 0.22 to 190, respectively, implying that the groundwater accumulates significant amounts of radiogenic 4 He as it flows. In groundwater from sedimentary rocks, the levels of accumulated helium increase with depth, whereas those in the samples from fractured granite vary from borehole to borehole. Considering the hydrogeological and topographical model together, dissolved He concentrations in groundwater indicate the groundwater flow direction. Although the groundwater flow in fractured granite is generally thought to be controlled by the fracture pattern, the overall flow of the Tono area inferred from helium isotopes is also controlled by topography.

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Section: Helium and Neon Isotopesmentioning

confidence: 99%

Section: Helium and Neon Isotopesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Dissolved helium distribution in deep groundwaters from the Tono area, central Japan: a tool for tracing groundwater flow in fractured granite

Morikawa¹

2004

Limnology

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“…lines are fitted using lOWess. age estimates (yr) are from multiple published sources (elliott 1990, 2000, elliott et al 1999, Manga 1999, edmunds and smedley 2000, Iwatsuki et al 2001, Katz et al 2001, Plummer et al 2001, 2000, swanson et al 2001, swarzenski et al 2001, dowling et al 2003, Chen et al 2003, sturchio et al 2004). 19 Tg of C to surface waters annually.…”

Section: Methodsmentioning

confidence: 99%

Size, age, renewal, and discharge of groundwater carbon

Downing

Striegl

2018

Inland Waters

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Groundwater carbon (C) supply to lakes and streams is important to understanding the role of inland waters in global and regional cycles and in the functioning of aquatic ecosystems. We provide new estimates of the size and discharge of the groundwater C pool using data from a broad survey of groundwater C, information on the depth distribution of groundwater, and data on groundwater age. About 0.25 × 10 6 km 3 of the 8 × 10 6 km 3 of groundwater resource is within 100 m of the surface and 4.2 × 10 6 km 3 is above 2000 m. Ages show an average groundwater turnover time of 10 yr at 25 m, 350 yr at 100 m, increasing to about 100 000 yr at 600 m. Global groundwater discharge is 16 000 km 3 yr −1; >16% of precipitation passes through groundwater. Groundwater dissolved organic C (DOC) can be high in shallow groundwater but stabilizes at ~2-4 mg L −1 at 100 m. Average groundwater dissolved inorganic C (DIC) is ~30-43 mg L −1. Groundwater C content to 2000 m is ~145 Pg, about the same as all marine sediments and about one-sixth that of the surface ocean. Groundwater C discharge to continental waters is 0.68 Pg yr −1 , or 3.4 times that estimated from river base-flow and submarine groundwater discharge. This discharge is 68 times previous estimates, implying a total C flux from land of 3.6 Pg yr −1 ; 80% of discharge occurs from above 40 m and 99% from the upper 100 m.

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“…The geology, geochemistry, and hydrology of the Tono Uranium Deposit and surrounding area have been extensively described (Yoshida et al, 1994;Kanai et al, 1998;Iwatsuki and Yoshida, 1999;Iwatsuki et al, 2001Iwatsuki et al, , 2005Takahashi et al, 2002;Arthur et al, 2006;Sasao et al, 2006). The deposit is located in central Japan $40 km NE of Nagoya at the base of a 150 m deep sedimentary sequence.…”

Section: Site Descriptionmentioning

confidence: 99%

Microbial carbon cycling in oligotrophic regional aquifers near the Tono Uranium Mine, Japan as inferred from δ13C and Δ14C values of in situ phospholipid fatty acids and carbon sources

Mills

Amano

Slater³

et al. 2010

Geochimica et Cosmochimica Acta

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Carbon-14 study of groundwater in the sedimentary rocks at the Tono study site, central Japan

Cited by 28 publications

References 19 publications

Dissolved helium distribution in deep groundwaters from the Tono area, central Japan: a tool for tracing groundwater flow in fractured granite

Dissolved helium distribution in deep groundwaters from the Tono area, central Japan: a tool for tracing groundwater flow in fractured granite

Size, age, renewal, and discharge of groundwater carbon

Microbial carbon cycling in oligotrophic regional aquifers near the Tono Uranium Mine, Japan as inferred from δ13C and Δ14C values of in situ phospholipid fatty acids and carbon sources

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