| 郯庐断裂带温泉和天然气的He、Ar同位素组成特征及其构造活动 |
| 蒋珊
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| 1993
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| 学位授予单位 | 中国科学院地球化学研究所
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| 学位授予地点 | 中国科学院地球化学研究所
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| 学位名称 | 博士
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| 学位专业 | 天体化学
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| 关键词 | 郯庐断裂带
超壳深断裂
地幔源
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| 摘要 | 郯庐断裂带是中国东部一条长期发展起来的，至今仍在活动的巨型超壳深断裂。其本身所具有的重要地质意义，一直吸引着重多的地质工作者。本文就是从稀有气体方面对郯庐断裂带的构造特征做一个探索性的研究。沿郯庐断裂带的温泉及天然气，其R/Ra(R =(~3He/~4He)样，Ra为空气样值）大于1，最高达5 ～ 6，显示了He的部分地幔来源。Ar同位素也有类似特征，除去时间效应，天然气的~(40)Ar/~(36)Ar过剩，同样批示Ar的部分地幔来源。这都表明了郯庐断裂带是一条超亮深断裂，如此才能使得沿带的温泉及天然气的Ha、Ar含有幔源成分。对比带外的温泉及天然气的He、Ar同位素，均体现大气与地壳来源。天然气样所在储集层的年代从志留系（S）到晚第三纪（N），均显示了He、Ar的地幔来源。可以推知，郯庐断裂带具有长期的活动性，是长期发展起来的。温泉是现代地质活动的一种表征，其R/Ra值最高达4.41，显示了He的地幔来源，表明郯庐断裂带在现代仍具有活动性。 |
| 其他摘要 | Tan-Lu Rift Zone is a deep fault located in eastern China, which is the result of secular movement and now is in action. The R/Ra(R = ~3He/~4He) sample, Ra = (~3He/~4He)air) of hot springs and nature gases situated along this rift zone are bigger than 1, the biggest is 5 ～ 6. It has been suggested that Helium is partly derived from the mantle source. So is Argon isotope. Thinking of time effect, ~(Ar)/~(36)Ar is excessive, suggested that Argon has partly mantle origin. These all indicate that Tan-Lu Rift Zone is a deep fault across the crust. Compare with Helium and Argon isotopes of hot springs and nature gases located out the rift zone, we can find that the latter mainly have air and crust origin. The age of nature gas reservoir is from Silurian Period to Neogene Period, all mean that Helium and Argon have mantle origin. So we can say, Tan- Lu Rift Zone has long- term mobility, and come into being by secular movement. Hot springs often have information of recent geological movement, The R/Ra are up to 4.41, showing mantle origin of the Helium. It indicate that Tan-Lu Rift Zone is in action now. |
| 页数 | 41
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| 语种 | 中文
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| 文献类型 | 学位论文
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| 条目标识符 | http://ir.gyig.ac.cn/handle/352002/3910
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| 专题 | 研究生_研究生_学位论文
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推荐引用方式
GB/T 7714 |
蒋珊. 郯庐断裂带温泉和天然气的He、Ar同位素组成特征及其构造活动[D]. 中国科学院地球化学研究所. 中国科学院地球化学研究所,1993.
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