S. Ishihara, Tsuyoshi Tanaka, S. Terashima, S. Togashi, S. Murao, H. Kamioka
{"title":"Peralkaline Rhyolite Dikes at the Cape Ashizuri : A New Type of REE and Rare Metal Mineral Resources","authors":"S. Ishihara, Tsuyoshi Tanaka, S. Terashima, S. Togashi, S. Murao, H. Kamioka","doi":"10.11456/SHIGENCHISHITSU1951.40.107","DOIUrl":null,"url":null,"abstract":"The final product of the Cape Ashizuri A-type granitic activities of Miocene age in the Outer Zone of Southwest Japan is a few N-S trending dikes of rhyolitic composition. This rock is pale bluish green in color composed mainly of alkali feldspar and alkali amphibole, and some accessory minerals. Its (Na2O+K2O)/Al2O3 (mole) exceeds 1, thus peralkaline in the chemistry. The rock is anomalously rich in the following valuable rare metal elements; Nb 633 ppm (50 times of JG-1 granodiorite reference sample), Ta 52 ppm (31 times), Zr 1567 ppm (15 times), Hf 38 ppm (11 times), Th 104 ppm (8 times), U 25 ppm (7.6 times), total rare earth elements (REE) 751 ppm (6.5 times) and Y 161 ppm (5.4 times). These elements appear to be contained at least four independent accessory minerals. The rock can therefore be a new type of rare metal mineral resources.","PeriodicalId":383641,"journal":{"name":"Mining geology","volume":"66 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"1990-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"7","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Mining geology","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.11456/SHIGENCHISHITSU1951.40.107","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 7
Abstract
The final product of the Cape Ashizuri A-type granitic activities of Miocene age in the Outer Zone of Southwest Japan is a few N-S trending dikes of rhyolitic composition. This rock is pale bluish green in color composed mainly of alkali feldspar and alkali amphibole, and some accessory minerals. Its (Na2O+K2O)/Al2O3 (mole) exceeds 1, thus peralkaline in the chemistry. The rock is anomalously rich in the following valuable rare metal elements; Nb 633 ppm (50 times of JG-1 granodiorite reference sample), Ta 52 ppm (31 times), Zr 1567 ppm (15 times), Hf 38 ppm (11 times), Th 104 ppm (8 times), U 25 ppm (7.6 times), total rare earth elements (REE) 751 ppm (6.5 times) and Y 161 ppm (5.4 times). These elements appear to be contained at least four independent accessory minerals. The rock can therefore be a new type of rare metal mineral resources.
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