A low-temperature hydrothermal metasomatic deposit found in carbonate rocks such as limestone and dolostone. It usually contains 3-10% lead and zinc, and sometimes fluorite and barite are also mined. It is so named because many deposits have been found in the Mississippi River basin in the United States. It is also found in Canada, Ireland, the Alps in Europe, and northern Africa, but has not been found in Japan. It is often found around thick sedimentary basins containing petroleum and evaporite, and volcanic activity related to the formation of the deposits is generally not observed. Source: Heibonsha World Encyclopedia, 2nd Edition Information |
石灰岩,ドロストーンなどの炭酸塩岩中に存在する低温熱水性交代鉱床。普通3~10%の鉛・亜鉛を含み,ときに蛍石や重晶石も採掘の対象となる。アメリカのミシシッピ川流域に多くの鉱床が発見されているのでこの名がある。ほかに,カナダ,アイルランド,ヨーロッパのアルプス地域,アフリカ北部などに産出するが日本では産出例がない。石油や蒸発岩を含む厚い堆積盆の周辺に分布することが多く,鉱床生成に関係するような火成活動は一般に認められない。
出典 株式会社平凡社世界大百科事典 第2版について 情報 |
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