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- 陽明山國家公園大屯火山群噴氣之氦同位素比值研究
- 大屯火山群火山氣體成份與來源之探討
- Fumarolic Gas Composition of the Tatun Volcano Group, Northern Taiwan
- 大油坑的活動性與潛在危險
- 大屯火山群火山活動性監測
- Distribution and Significance of Volcanic Materials in Sediments of the Taipei Basin
- Characteristics of the Tatun Volcanic Eruptions, North Taiwan: Implications for a Cauldron Formation and Volcanic Evolution
- 從火山地形探討大屯火山群的地層層序與構造
- Eruptions Younger Than 20 Ka of the Tatun Volcano Group as Viewed from the Sediments of the Sungshan Formation in Taipei Basin
- The Tatun Volcano Group is Active or Extinct?
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題 名 | 陽明山國家公園大屯火山群噴氣之氦同位素比值研究=The Helium Isotopic Ratios of Fumaroles from Tatun Volcano Group of Yangmingshan National Park, N. Taiwan |
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作 者 | 楊燦堯; | 書刊名 | 國家公園學報 |
卷 期 | 10:1 2000.06[民89.06] |
頁 次 | 頁73-94 |
分類號 | 354.1 |
關鍵詞 | 大屯火山群; 火山噴氣; 氦同位素比值; 稀有氣體質譜儀; Tatun volcano group; Fumarole; Helium isotopic ratios; Noble gas mass spectrometer; |
語 文 | 中文(Chinese) |
中文摘要 | 利用兩年前採集保留至今的樣品,比較兩年前與最近分析氦同位素比值結果顯示,我們所採用的直空採樣瓶與樣品採集方法,非常適合用於火山噴氣與溫泉氣體之研究。 經過空氣值校正後,兩年來(1997/1~1999/5)大屯火山群噴氣所含氦同位素比值(3He/4He)介於4.0~7.1倍大氣比值(平均值為5.39±0.77RA);其中大油坑之噴氣比值最高,而馬槽之噴氣則最低。顯示大油坑與馬槽地理位置雖相鄰近,卻有不同的噴氣來源、或者不同上升至地表的管道。 比較同一地區兩年前與最近採樣分析結果顯示,各地區之噴氣3He/4He比值似乎都有增加的趨勢。尤其1997年與1999年之間,本地區似乎有新的岩漿源補充,造成整體比值的增加。 假設大屯火山群噴氣中之氦同位素組成是由岩漿源端成份(7.0 RA)與地殼端成份混合而成,則我們可以估算大屯火山群之噴氣平均有大於75%源自於地底下之岩漿源。大油坑之噴氣甚至有98%是來自於岩漿源,暗示臺灣北部地底下可能有岩漿庫的存在。 |
英文摘要 | Fluid samples were collected from the Tatun Volcano Group for the helium isotope measurement. Among them, 14 samples were collected in January 1997; meanwhile, the others were collected from the same area two years after the first sampling (Jan. To May 1999). All the samples were measured in two weeks after collection. However, three of them were stored and measured again after two years at the same laboratory for the leakage test of sampling bottles. The two sets of data are consistent with each other, indicating that the vacuum K-glass bottles used in this study are suitable for gas sampling. Except for few sample with too low He/Ne ratios to do air correction, most samples can be corrected for air contamination. The corrected helium isotopic ratios show a range of 4.0~7.1 times air ratio (RA) with the mean value of 5.39±0.77 RA. It is interesting that different samples collected at the same time from the same locality always exhibit coherent corrected results. It may indicate that there is same helium source for both fumarolic gases and bubbling gases of hot spring at the same area of Tatun Volcano Group. The highest helium isotopic ratio of 7.06±0.18 RA is obtained from the fumarolic gas of Da-Yiou-Keng (大油坑; DYK); while, the fumarolic gas from Ma-Tsao (馬槽; MT) exhibited the lowest 3He/4He ratio of 3.98±0.20 RA. It implies that there may be different sources and/or mixing components for helium isotopes at different localities of Tatun Volcano Group. Assuming that the measured helium isotopes resulted from mixing of the magmatic component (7.0 RA)with the crustal component (0.1 RA), we can estimate that more than 75% of the helium from the fluid samples on average originated from the deep magmatic component. Comparing the helium isotopic data obtained in the last two years, all data show increase of helium isotopic ratios with time. A significant increasing of 3He/4He ratio probably occurred between January 1997 and January 1999. It suggests that there may be a new input of magmatic source beneath North Taiwan. |
本系統中英文摘要資訊取自各篇刊載內容。