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Groundwater dating by estimation of groundwater flow velocity and dissolved 4He accumulation rate calibrated by 36Cl in the Great Artesian Basin, Australia
https://repo.qst.go.jp/records/45668
https://repo.qst.go.jp/records/45668db6d9d9d-3d7e-4499-8dac-0ec8d5db3a22
| Item type | 学術雑誌論文 / Journal Article(1) | |||||
|---|---|---|---|---|---|---|
| 公開日 | 2009-11-04 | |||||
| タイトル | ||||||
| タイトル | Groundwater dating by estimation of groundwater flow velocity and dissolved 4He accumulation rate calibrated by 36Cl in the Great Artesian Basin, Australia | |||||
| 言語 | ||||||
| 言語 | eng | |||||
| 資源タイプ | ||||||
| 資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||
| 資源タイプ | journal article | |||||
| アクセス権 | ||||||
| アクセス権 | metadata only access | |||||
| アクセス権URI | http://purl.org/coar/access_right/c_14cb | |||||
| 著者 |
Mahara, Yasunori
× Mahara, Yasunori× Habermehl, M.A.× Hasedawa, Takuma× Nakata, Koutarou× Ransley, T.R.× Hatano, T× Mizuochi, Yukihiro× Kobayashi, Hidemitu× Ninomiya, A× Senior, B.R.× Yasuda, Hiroshi× Ohta, T× 保田 浩志 |
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| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | We tested two methods for dating groundwaters that cannot be reliably measured by Cl-36 dating alone, one based on groundwater flow velocity plus distance along a flow path and the other based on He-4 accumulation rates calibrated with Cl-36 dates. We sampled groundwaters along six inferred regional groundwater flow paths in the Great Artesian Basin (GAB) of Australia. We selected three groundwater paths where the decrease in Cl-36 was largely controlled by cosmogenic Cl-36 radioactive decay without a significant increase in chloride concentration. The extrapolated groundwater velocities were 0.133+-0.018 m/y to 0.433+-0.140 m/y. The estimated residence time of 1.06x10^6 y at the discharge area around Lake Eyre was comparable to the estimate of (1-2.2) x 10^6 y in previous studies. On the other hand, our estimated He-4 accumulation rates for the selected three groundwater flow paths (1.85+-0.31x10^-1 to 1.51+-0.63x10^-10 ccSTP/cm^3/y) were approximately 2-5 times lower than previously reported rates for the central GAB. Our estimated rate of 1.51x10^-10 ccSTP/cm^3/y in the western GAB is compatible with previous estimates based on Kr-81 ages. The groundwater residence time estimated from the He-4 accumulation rate was approximately 7x10^5 y near the discharge area at Lake Eyre. Finally, both estimations were mutually compatible with a 30% error. | |||||
| 書誌情報 |
Earth and Planetary Science Letters 巻 287, 号 1/2, p. 43-56, 発行日 2009-09 |
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| ISSN | ||||||
| 収録物識別子タイプ | ISSN | |||||
| 収録物識別子 | 0012-821X | |||||
