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A Comparative Ore-Geochemistry of the Geologic Terrains in Japan

日本地质地形的比较矿石地球化学

基本信息

批准号：
01430011
负责人：
KAJIWARA Yoshimichi
金额：
$ 7.68万
依托单位：
University of Tsukuba
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (A)
财政年份：
1989
资助国家：
日本
起止时间：
1989 至 1990
项目状态：
已结题

项目摘要

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).

海洋通量在成矿作用中的作用：过渡元素分布的比较地球化学研究（嘉原吉道）摘要：为了验证过渡元素丰度假说，本文试图计算一些代表性矿床和海洋沉积物中过渡元素的相对丰度。在全球洋底的锰结核和日本绿色凝灰岩地区的黑子矿石之间观察到一种美丽的成分模式对称关系。在绿色凝灰岩区，高度氧化的远洋沉积物和相对还原的页岩之间也存在着基本相似的关系。另一方面，在日本的贝西型矿石和产于古生代至中生代地层中的层状锰矿之间存在着另一种关系，这种关系不同于锰结核和黑子矿石之间所观察到的关系。值得注意的是，Besshi型矿石在成分模式上与挪威Framvaren缺氧峡湾的草莓状黄铁矿相似，层状锰矿与日本海西南缘的弱氧化褐色泥相似。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，从而有力地证明它们基本上主要是由从海洋中去除的含金属沉降颗粒的氧化还原分馏产生的（即，e. Oscillos）。