A Comparative Ore-Geochemistry of the Geologic Terrains in Japan

摘要为了验证PUMOS假说，对一些具有代表性的矿床和海相沉积物中过渡元素的PUMOS标准化相对丰度进行了计算。世界海底锰结核与日本绿凝灰岩地区的黑子矿在组成模式上具有美丽的对称关系。绿凝灰岩区高度氧化的远洋沉积物与相对还原的页岩之间也存在本质上类似的关系。另一方面，产于日本古生代至中生代的别石型矿与层状锰矿之间存在另一种关系，这种关系与锰结核矿与黑子矿之间的关系不同。值得注意的是，别石型矿与挪威Framvaren缺氧峡湾的草莓状黄铁矿、层状锰矿与日本海西南缘的弱氧化褐泥的组成模式相似。这些发现将表明，自然界中的矿床在地球化学上相当于海洋沉积物中的硫化物和氧化物组分，因此有力地证明，它们基本上主要是由从海洋中移出的含金属沉降颗粒（即PUMOS）的氧化还原分馏产生的。

Role of Ocean-Flux in Metallogeny : A Comparative Geochemical Study on the Distribution of Transition Elementsby Yoshimichi Kajiwara Abstract : In order to test the PUMOS hypothesis, an attempt has been made to figure out PUMOS-normalized relative abundances of transition elements in some representative ore deposits and marine sediments. A beautiful symmetric relationship in compositional pattern is observed between Manganese Nodule from the world-wide ocean floor and Kuroko Ore from the Green Tuff region of Japan. Essentially similar relationship is also found between the highly-oxidized pelagic sediments and the relatively reduced shales in the Green Tuff region. On the other hand, between Besshi-Type Ore and Bedded Manganese Ore occurring in the Paleozoic to Mesozoic formations in Japan exists another relationship which is different from what is observed between Manganese Nodule and Kuroko Ore. It is interesting to note that Besshi- Type Ore is similar in compositional pattern to the framboidal pyrite from the Framvaren anoxic fjord in Norway and Bedded Manganese Ore to the weakly-oxidized brownish mud from the southwestern margin of Japan Sea. These findings would indicate that the ore deposits in nature are geochemically equivalent to sulfide and oxide fractions in the marine sediments, and thus strongly evidence that they are essentially originated primarily by the redox fractionation of metalliferous settling particulates which are removed from the ocean (i. e. PUMOS).