Metalliferous shales of Neogene in Japan : characterization, age, distribution, formative processes and environment

日本新近纪含金属页岩：特征、年龄、分布、形成过程和环境

• 批准号: 07640635
• 负责人: KOMURO Kosei
• 金额: $ 1.41万
• 依托单位: University of Tsukuba
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1995
• 资助国家: 日本
• 起止时间: 1995 至 1997
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07640635/
• 关键词: Neogene; Green tutt region; metalliterous shale; muolstone; chemical composition; heavy metal; sultur isotope; Tormative environment; 頁岩; 化学組成; 微量元素; 黄鉄鉱ノジュール; 炭酸塩岩層; 黒鉱鉱床; イオウ同位体比; 時空分布

In orfer to understand the genesis of the metalliferous mudstones and shales, i.e., age, distribution, formative processes and environment, in the Green tuff region of northeastern Japan, mineralogy, chemistry and sulfur isotopes of mudstones and shales in the region had carefully been investigated. The results obtained are reported here. Important results are as follows :Chemical analysis data for a series of whole-rock samples from the taiheizan district reveal that the uppermost Uyashiai Mudstone (Nishikurosawa stage) and the iowermost onnagawa Hard Mudstone (Onnagawa stage) are enriched in Zn, Cu, Pb and Ba compared to the upper onnagawa Hard Mudstone and Funakawa Black Mudstone (Funakawa stage). Sulfur isotopic rations (delta<@D134@>D1S<@D2CDT@>D2) of whole-rock sulfides from the Uyashinai Mudstone range from -35* to -40*, those from the Onnagawa Hard Mudstone range from +5* to -10*, and those from Funakawa Black Mudstone range from (]SY.+-。[)0* to -30*.It should be noted that rem … More arkable enrichment in Zn, Cu, Pb and Ba and abrupt change of sulfur isotopes can be observed just at the vary Nishikurosawa/Onnagawa boundary.Ore-microscopic observation has revealed that the mudstones of the upper Nishikurosawa stage (eg. the Ohmatagawa Mudstone) commonly contains micro-grains of sphalerite and chalcopyrite in association with framboidal and euhedral aggregates of pyrite. The sphalerite often has an unique texture like a sort of chalcopyrite-diseased one and almost always fills in the tests of fossil foraminifera. The sphalerite formation is thus suqqested to be due to bacterial sulfate reduction coupled with decomposition of organic matter during the early diagenetic stage. It is worth noting here that the Ohmatagawa Mudstone with the unique occurrence of zinc and copper sulfides is stratigraphically correlatable to the currently-accepted Kuroko-bearing horizon.On the basis of the results obtained, an attempt is made to construct a qenetical model of the metalliferous mudstones and shales, and to evaluate paleoenvironmental controls on the middle Miocene metallogensis. Less

为了了解日本东北部绿色凝灰岩地区含金属泥岩和页岩的成因，即年龄、分布、形成过程和环境，对该地区泥岩和页岩的矿物学、化学和硫同位素进行了仔细研究所得结果报告如下：太黑山地区一系列全岩样品的化学分析数据表明，与上部恩纳川硬质泥岩和船川黑色泥岩（船川级）相比，Uyashiai 泥岩（西黑泽级）和最下面的恩纳川硬质泥岩（恩纳川级）富含 Zn、Cu、Pb 和 Ba（硫同位素比率）。全岩@>D1S<@D2CDT@>D2) Uyashinai 泥岩的硫化物范围为 -35* 至 -40*，Onnakawa 硬泥岩的硫化物范围为 +5* 至 -10*，Funakawa 黑泥岩的硫化物范围为 (]SY.+-.[)0*到-30*。应该指出的是，就在矿石显微观察表明，西黑泽期上部的泥岩（例如大俣川泥岩）通常含有闪锌矿和黄铜矿的微晶粒，并伴有藤状和自形的黄铁矿聚集体。一种独特的质地，就像一种患有黄铜矿病的质地，几乎总是能满足化石的测试因此，闪锌矿的形成可能是由于早期成岩阶段的细菌硫酸盐还原和有机质分解所致。这里值得注意的是，具有独特的锌和铜硫化物产状的大俣川泥岩在地层上与有孔虫有关。在所得结果的基础上，尝试构建黑子层位的遗传模型。含金属泥岩和页岩，并评估古环境对中新世中期成矿作用的控制。

项目成果

Komuro, K.(Ito, T): "Geochemictry of sediments and authigenic minerals in and around the decollement zone of the northern Barbados ridge accretionary prism" Proc.ODP Sci.Results. 156. 171-182 (1997)

Komuro, K.（Ito, T）：“巴巴多斯北部海岭增生棱柱滑脱带及其周围沉积物和自生矿物的地球化学”Proc.ODP Sci.Results。

Horikawa, Y., Komuro, K.他: "Migration,fixation,and long-term preservation of uranium in the Tono ura-nium deposits,Japan:a mineralogical app-roach" Internat.Conf.Geochem.Migration Behavior Actinides Fission Products in Geosphere (Migration'97). 6. 87 (199

Horikawa, Y., Komuro, K. 等人：“日本远野铀矿床中铀的迁移、固定和长期保存：一种矿物学方法”Internat.Conf.Geochem.迁移行为锕系元素地圈中的裂变产物（迁移97）。 6. 87 (199)。

Wilder,M.N., Komuro,K.他: "Salinity,methyl farnesoate titers,and osmotic and ionic regulation in Macrobrachium rosenbergii" Pioc.Internat.Congr.Comparative Endocrinol.13. 93-96 (1997)

Wilder, M.N., Komuro, K. 等人：“罗氏沼虾的盐度、法尼索酸甲酯滴度以及渗透压和离子调节”Pioc.Internat.Congr.Comparative Endocrinol.13 (1997)。

小室 光世: "「固体試料分析の基礎」中の4章「蛍光X線分析」" 農林水産省農林交流センター, 91-132 (1997)

小室光代：“《固体样品分析基础》第 4 章‘荧光 X 射线分析’”农林水产省农林交流中心，91-132 (1997)

八田 珠郎・小室 光世 他: "蛍光X線による粘土鉱物の迅速分析" 理学電機ジャーナル. 27. 19-24 (1996)

Juro Hatta、Mitsuyo Komuro 等人：“使用荧光 X 射线快速分析粘土矿物”Rigaku Denki Journal，27. 19-24 (1996)。