这是一篇论文中的一节。该论文指出,与镁铁质火山岩有关的喷气成因的锡、钨矿床是与花岗岩类岩有关的锡、钨矿床的标志。作者(Plimer,I.R.)指出:全球大多数的原生锡矿均与花岗岩类岩或次火山长英侵入岩和(或)熔岩有关。矿床多产出于古生代、中生代和第三纪环太平洋造山带里,偶尔也 This is a section of a paper. The paper points out that the jet-forming tin and tungsten deposits associated with mafic volcanics are hallmarks of the tin and tungsten deposits associated with granitoids. The authors (Plimer, I.R.) point out that most of the native tin deposits in the world are associated with granite or sub-volcanic Changying intrusions and / or lavas. The deposits are prolific in the Paleozoic, Mesozoic and Tertiary epicyclic orogenic belts, occasionally