…10%, 6%, and 22% of the world's copper, lead, and zinc resources are from kuroko or kuroko-type deposits, respectively. In a typical kuroko deposit, the ore is generally divided into three types, changing from the bottom to the top of the ore body in the order of siliceous ore (pyrite-chalcopyrite-quartz), pyrite (pyrite-chalcopyrite), and kuroko (sphalerite-galena-tetrahedrite-chalcopyrite-barite). Regarding the origin of the deposits, there has long been a debate between the replacement theory and the fumarolic sedimentation theory, but it is now widely accepted in the academic community that they are the product of fumarolic hydrothermal action associated with submarine volcanic activity. … *Some of the terminology that mentions "yellow ore" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…世界の銅,鉛,亜鉛の資源量のうち,それぞれ10%,6%,22%が,黒鉱ないし黒鉱型鉱床からのものである。 典型的な黒鉱鉱床では,鉱石は一般に3種にわけられ,珪鉱(黄鉄鉱―黄銅鉱―石英),黄鉱(黄鉄鉱―黄銅鉱),黒鉱(セン亜鉛鉱―方鉛鉱―四面銅鉱―黄銅鉱―重晶石)の順に,鉱体の下部から上部にかけて変化している。成因に関しては,古くから交代説と噴気堆積説の間で論争があったが,現在では海底火山活動に伴う噴気熱水作用による生成物であることが,広く学界に認められている。… ※「黄鉱」について言及している用語解説の一部を掲載しています。 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 |
<<: Transverse colon - Transverse colon
...For each k = 1, 2, ..., n , f ( a 1 , ..., a k...
Written by Oshio Heihachiro. 2 volumes. Published ...
〘noun〙① A sound of medium height, neither too high...
…Many folk performing arts have themes that are d...
It is a mammalian animal of the order Artiodactyl...
...R. de Graf, who came from that school, discuss...
…Therefore, since the end of the 19th century, ex...
…The first type is a patent or know-how license a...
Year of death: September 5, 1628 (October 2, 1628)...
It was also written as "Aio Tsubo" and w...
…Rocky coasts are called iso or isohama, as oppos...
Since the mid-Edo period, policies to encourage fa...
...If the animal successfully exits the box, it i...
A relatively small mass of rising air that occurs...
A compound that was used as a disinfectant. It is ...