Jurassic and Cretaceous Granitic Rocks in South Korea
Jurassic and Cretaceous Granitic Rocks in South Korea
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韩国侏罗纪和白垩纪花岗岩
DOI：
10.11456/shigenchishitsu1951.31.261
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发表时间：
1981
期刊：
影响因子：
--
通讯作者：
Kyong Gwon Min
中科院分区：
文献类型：
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作者：
Akio Tsuesue;T. Mizuta;M. Watanabe;Kyong Gwon Min
认识到氯络合在提高金属硫化物在水溶液中的溶解度方面的重要性，人们认为侵入岩的氯含量可以控制岩浆分离富含金属的热液相的能力。韩国白垩纪花岗岩中的磷灰石、黑云母和角闪石的氯含量相对较高，而侏罗纪花岗岩中的相同矿物基本上不含氯。磷灰石与黑云母之间的氯-羟基交换分配系数取决于黑云母组成，磷灰石与角闪石之间的氟-羟基交换分配系数取决于角闪石组成。对角闪石化学的详细考虑显示了 edenitic 和 tschermakitic 取代方案的优势，以及八面体位点中的 Ti 取代和四面体位点中的 Al 取代之间的耦合。虽然庆尚盆地白垩纪花岗岩大部分属于磁铁矿系，但侏罗纪花岗岩一部分属于磁铁矿系，一部分属于钛铁矿系。对于侏罗纪花岗岩，黑云母和角闪石的Fe/(Fe+Mg)随着母岩SiO2含量的增加而增加；对于庆尚盆地白垩系花岗岩来说，相同矿物的Fe/(Fe+Mg)随着母岩SiO2的增加而减少。研究表明，随着母岩 SiO2 的增加，铁镁质矿物的 Fe/(Fe+Mg) 趋势在很大程度上取决于这些岩浆中是否存在早期磁铁矿结晶。从花岗岩的产状和结构以及造岩矿物，特别是镁铁质硅酸盐的化学性质来看，庆尚盆地的白垩纪花岗岩与侏罗纪花岗岩相比属于高级侵入体。如果接受氯化物络合物中贱金属的热液迁移，则表明韩国大部分热液贱金属矿床与白垩纪花岗岩岩浆有关。韩国贱金属矿床的硫同位素组成也支持这一结论。引言 认识到氯络合在提高金属硫化物在水溶液中的溶解度方面的重要性（例如 HELGESON，1964），人们得出这样的观点：岩浆的氯含量可以控制其分离富金属热液相的能力（STOLERY 等人，1971；HOLLAND，1972）。斯托勒里等人。 (1971) 提出通过测量岩浆黑云母的氯含量来确定侵入岩的“矿物潜力”。在随后对该建议的评估中，几位研究人员比较了矿化侵入岩和贫瘠侵入岩中黑云母的氯含量（KESLER 等，1975；等）。这些研究的结果在细节上有所不同，但已逐渐得出这样的结论：富氯岩浆黑云母与伴生矿之间的相关性 * 1981 年 1 月 27 日在东京举行的日本和韩国花岗质岩浆作用和伴生矿化研讨会上发表的论文。手稿于 3 月 15 日收到； 1981年6月25日接受。 ** 熊本大学理学院地质系，熊本 860。 *** 广岛大学理学院地质与矿物学系，广岛 730。 **** 韩国春川江原大学工程学院矿物与石油工程系。
Recognition of the importance of chlorine complexing in enhancing the solubility of metal sulfides in aqueous solution has led to the view that the chlorine content of intrusive rocks could govern the ability of a magma to separate a metal-rich hydrothermal phase. Relatively high chlorine contents were obtained for apatites, biotites, and amphiboles from Cretaceous granitic rocks in South Korea, whereas the same minerals from the Jurassic granitic rocks are essentially chlorine-free. The distribution coefficient for chlorine-hydroxyl exchange between apatite and biotite depends on biotite composition and the distribution coefficient for fluorine-hydroxyl exchange between apatite and amphibole de pends on amphibole composition. Detailed consideration of amphibole chemistry shows predominance of edenitic and tschermakitic substitution schemes, as well as coupling between substitution of Ti in octahedral sites and Al in tetrahedral sites. Although the most of the Cretaceous granitic rocks in the Kyongsang basin belong to the magnetite-series, the Jurassic granitic rocks belong in part to the magnetite-series and in part to the ilmenite-series. For the Jurassic granitic rocks, Fe/(Fe+Mg) for biotites and amphiboles increased with an increase in host-rock SiO2 content; for the Cretaceous granitic rocks in the Kyongsang basin, Fe/(Fe+Mg) for the same minerals decreased with an increase in host-rock SiO2. It is suggested that the trend followed by Fe/(Fe+Mg) for mafic minerals with in creasing host-rock SiO2 was largely dependent on the presence or absence of early magnetite crystallization in these magmas. From the mode of occurrence and textures of the granitic rocks and from the chemistry of rock-forming minerals, especially of mafic silicates, it is suggested that the Cretaceous granitic rocks in the Kyongsang basin are high level intrusions compared to the Jurassic granitic rocks. If hydrothermal transport of base metals in chloride complexes is accepted, it is suggested that most of hydrothermal base metal deposits in South Korea were associated with the Cretaceous granitic magmas. Sulfur isotopic composition of base metal deposits in South Korea also supports this conclusion. Introduction Recognition of the importance of chlorine complexing in enhancing the solubility of metal sulfides in aqueous solutions (e.g. HELGESON, 1964) has led to the view that the chlorine content of a magma could govern its ability to separate a metal-rich hydrothermal phase (STOLLERY et al., 1971 ; HOLLAND, 1972). STOLLERY et al. (1971) proposed that the "mineral -potential" of intrusive rocks be determined by measuring the chlorine content of their magmatic biotite. In subsequent evaluations of this suggestion, several investigators compared the chlorine contents of biotites from mineralized and barren intrusive rocks (KESLER et al., 1975; and others). The results of these studies have differed in detail but have evolved toward the conclusion that the correlation between chlorine-rich magmatic biotite and associated * Paper presented at the Symposium on Granitic Magmatism and Associated Mineralization in Japan and Korea, held in Tokyo on January 27, 1981. The manuscript received on March 15; accepted on June 25, 1981 . ** Department of Geology , Faculty of Science, Kumamoto University, Kumamoto 860. *** Department of Geology and Mineralogy , Faculty of Science, Hiroshima University, Hiroshima 730. **** Department of Mineral and Petroleum Engineering, College of Engineering, Gangweon University, Chuncheon, Korea.
日本ICT服务企业眼中的中国业务及其业务体系策略（下）
DOI：
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发表时间：
2005
期刊：
立正経営論集 38/1
影响因子：
--
作者：
Morita;M.;K.G.Nishimura(森田正隆);山崎 和海
通讯作者：
山崎 和海