古堆積環境指定指示元素としての塩素および臭素,ヨウ素に関する知見

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タイトル別名
  • Chlorine, bromine and iodine as geochemical indicators for depositional paleoenvironment
  • 古堆積環境推定指示元素としての塩素および臭素,ヨウ素に関する知見
  • コ タイセキ カンキョウ スイテイ シジ ゲンソ トシテノ エンソ オヨビ シ

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抄録

Chlorine, bromine and iodine contents were determined by neutron activation analysis on outcrop and borehole samples of the Tertiary marine and fresh-water mudstones in order to investigate the possibility of these elements as indicators for estimating the depositional paleoenvironment. The leachable halogen contents by aqueous and acidic solutions were also determined experimentally to clarify the mode of occurrence of these elements in marine mudstones. It is concluded that chlorine is not suitable as the geochemical indicator for distinguishing the marine mudstones from the fresh-water ones because the element is easily leachable from marine mudstones by the action of the meteoric or circulating waters near the earth's surface. On the other hand, bromine and iodine are considered to be promising as the indicators, since these elements are less soluble in water than chlorine. However, these elemental contents of the outcrop marine mudstones are in the same level as those of the borehole fresh-water ones. The fact implies that these elements are still questionable as the paleosalinity indicators for the depositional environment.

収録刊行物

  • 地球化学

    地球化学 11 (2), 58-62, 1977

    一般社団法人日本地球化学会

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