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首页> 外文期刊>Journal of Asian earth sciences >Helium and carbon isotope variations in Liaodong Peninsula, NE China
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Helium and carbon isotope variations in Liaodong Peninsula, NE China

机译：中国东北辽东半岛的氦和碳同位素变化

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摘要

Chemical and C-He isotopic compositions have been measured for N_2-rich hydrothermal gases from the Liaodong (abbreviation of East Liaoning Province) Peninsula from which the oldest crustal rocks in China with ≥3.8 Ga outcrop. With the exception of one sample containing tritogenic ~3He and atmospheric ~4He in Liaoyang, the observed ~3He/~4He ratios from 0.1 Ra to 0.7 Ra indicate 1-8% helium from mantle, 92-98% from crust and 0.1-0.8% from atmosphere. Despite the lack of Quaternary volcanism, such ~3He/~4He ratios suggest, together with geophysical evidences, the existence of intrusive magmas that contain mantle helium and heat within the Liaodong middle-lower crust. The ~3He/~4He ratios are high along the NE-trend-ingjinzhou faults and gradually decrease with the increase of distance from the faults. Such a spatial distribution suggests that the mantle helium exsolves from magmatic reservoir in the middle-lower crust, becomes focused into the root zones of Jinzhou faults, and subsequently traverses the crust via permeable fault zones. When transversely migrated by groundwater circulation in near surface, mantle helium with high ~3He/~4He ratio may have been further diluted to the observed values by addition of radiogenic helium produced in the crust. This pattern shows strong evidence that the major faults played an important role on mantle-derived components transport from mantle upwards.
机译：已经测量了辽东半岛（辽东地区的缩写）中富含N_2的热液气体的化学和C-He同位素组成，该半岛是中国最古老的地壳岩石，露头≥3.8Ga。在辽阳，除了一个含有致t源〜3He和大气〜4He的样品外，观察到的〜3He /〜4He比从0.1 Ra到0.7 Ra表示地幔中的氦为1-8％，地壳中的氦为92-98％，地壳中的氦为92-98％，地壳中的氦为0.1-0.8。 ％来自大气。尽管缺乏第四纪火山作用，但〜3He /〜4He这样的比率与地球物理证据一起表明，辽东中下地壳内存在着含有地幔氦和热量的侵入性岩浆。 NE向-津津洲断裂带的〜3He /〜4He比值较高，并且随着距断层距离的增加而逐渐减小。这样的空间分布表明地幔氦从中下地壳的岩浆储层中溶解出来，集中到金州断裂的根部区域，然后通过渗透性断裂带穿过地壳。当通过地下水循环在近地表横向迁移时，〜3He /〜4He比高的地幔氦可能已经通过添加地壳中产生的放射性氦被进一步稀释至观测值。这种模式有力的证据表明，主要断层在地幔衍生的组分从地幔向上运输中起了重要作用。

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  • 来源
    《Journal of Asian earth sciences》 |2014年第15期|149-156|共8页
  • 作者

    Sheng Xu; Guodong Zheng; Xianbin Wang; Hualin Wang; Shunichi Nakai; Hiroshi Wakita;

  • 作者单位

    Lanzhou Center for Oil and Gas Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, Lanzhou 730000, China,Laboratory for Earthquake Chemistry, University of Tokyo, Tokyo 113-0033, Japan,Scottish Universities Environmental Research Centre, East Kilbride G75 0QF, UK;

    Lanzhou Center for Oil and Gas Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, Lanzhou 730000, China;

    Lanzhou Center for Oil and Gas Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, Lanzhou 730000, China;

    Shandong Institute of Seismic Engineering, Jinan 250021, China;

    Laboratory for Earthquake Chemistry, University of Tokyo, Tokyo 113-0033, Japan;

    Laboratory for Earthquake Chemistry, University of Tokyo, Tokyo 113-0033, Japan;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    ~3He/~4He; Hydrothermal fluid; Magmatic reservoir; Liaodong Peninsula; NE China;

    机译：〜3He /〜4He;热液岩浆储层;辽东半岛;中国东北;

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