Study of hydrothermal mineralization in Otaru district, Hokkaido, with special reference to acid sulfate alteration.

北海道小樽地区热液成矿研究，特别是酸性硫酸盐蚀变。

• 批准号: 02640618
• 负责人: YUI Shunzo
• 金额: $ 1.41万
• 依托单位: Hokkaido University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1990
• 资助国家: 日本
• 起止时间: 1990 至 1992
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-02640618/
• 关键词: Akaiwa, Otaru; Asari, Otaru; Acid sulfate alteration; Alunite; Miocene mineralization; K-Ar age; Migration of hydrothermal activity; 酸化とfs_2の変化; トパ-ズ; alunite; natroalunite; 熱水の通路; ダイアスポア; ズニ石; 層状明礬石ー石英岩

The Sea of Japan side of the northern part of Japanese Islands forms a geologic province called the Green Tuff region where occur many ore mineralizations including gold-silverveins, kuroko deposits, and base metal veins. Otaru is located at the northern end of the Green Tuff region. Akaiwa district was main target of this project and Asari district, 13 km southeast of Akaiwa was also studied.Mt. Shimo-akaiwa(279m above the sea) consists of intensely silicified volcanic rock (andesite?) containing alunite sporadically. At sea-shore, a silicified rock is surrounded by zoned alteration, argillic(mainly dickite) zone, illite(sericite)-smectite zone, chlorite zone, and propylite. The silicified rock contains diaspore crystals up to 2mm in size in the pore. In the argillic zone contains pyrophyllite and/or zunyite. This distribution of minerals seems to be resulted from oxidation of sulfur-containing acid hydrothermal solution."Breccia pipes" extend vertically. Inverse grading of silicified clast in a pipe suggests that it was formed by vigorous movements of ascending fluid. "Layered parts" are composed of fine-grained powders of quartz and alunite with normal size grading and seem to be formed in small hot lakes.Geothermometry using homogenization temperature of fluid inclusion, sulfur isotope fractionation between sulfide and sulfate minerals, and mineral stability gave 200-250ﾟC.Two K-Ar ages, 9.7*0.5 and 10.0*0.5 Ma have been obtaind from Akaiwa, and two, 6.1*0.6 and 4.8*0.4 from Asari, all for alunite. Considering younger ages reported from Toyoha, south of Asari, the hydrothermal activity migrated southwards since the Miocene age.

日本列岛北部的日本海一侧形成了一个称为绿色凝灰岩地区的地质省，那里存在许多矿石矿化，包括金银矿、黑子矿床和贱金属矿脉。小樽位于绿色凝灰岩地区的北端。赤岩地区是本项目的主要目标，赤岩东南 13 公里处的朝里地区也被研究。下赤岩（海拔279m）由强烈硅化的火山岩（安山岩？）组成，其中含有零星的明矾石。沿海硅化岩周围有带状蚀变带、泥质(主要是地开石)带、伊利石(绢云母)-蒙皂石带、绿泥石带、丙石带。硅化岩的孔隙中含有尺寸达2毫米的水硬铝石晶体。在泥质带中含有叶腊石和/或尊石。这种矿物分布似乎是含硫酸性热液氧化的结果。“角砾管”垂直延伸。管道中硅化碎屑​​的逆级配表明它是由上升流体的剧烈运动形成的。 “层状部分”由石英和明矾石的细粒粉末组成，具有正常的尺寸级配，似乎是在小型热湖中形成的。利用流体包裹体均一温度、硫化物和硫酸盐矿物之间的硫同位素分馏以及矿物稳定性进行的地温测量给出了200-250℃。两个K-Ar年龄，9.7*0.5和10.0*0.5 Ma已从 Akaiwa，还有两个，来自 Asari 的 6.1*0.6 和 4.8*0.4，均为明矾石。考虑到浅里南部丰叶报告的年龄较年轻，热液活动自中新世以来就向南迁移。

项目成果

Matsueda,H.: "Hydrothermal ore seposits and wall rock alteration in southwestern Hokkaido(A04)" Mineral deposits of Japan and the Philippines,29th IGC field trip guide book. 6. 17-60 (1992)

松枝H.：“北海道西南部的热液矿床和围岩蚀变（A04）”日本和菲律宾的矿床，第29届IGC实地考察指南书。

AKAMATSU,Kazuko: "Acid sulfate altertion at Akaiwa,near Otaru,southwestern Hokkaido" Hydrothermal ore deposits and wall rock alteration in south-western Hokkaido.29th IGC field trip A04 guide book. 18-23 (1992)

AKAMATSU，Kazuko：“北海道西南部小樽附近赤岩的酸性硫酸盐蚀变”北海道西南部热液矿床和围岩蚀变。第 29 次 IGC 实地考察 A04 指南。

Yang,Xuan-Zhu: "Chemical compositions and paragenesis of the platinum-group element minerals in the Jinchuan sulfide deposit,Gansu Province,China" Jour.Fac.Sci.,Hokkaido Uuiv.,Ser.IV. 23(2). 287-299 (1992)

杨轩朱：“甘肃金川硫化物矿床铂族元素矿物的化学组成及共生”，北海道大学学报，Ser.IV。

由井 俊三: "北海道小樽市赤岩の属状石英ー明礬石岩について(講演要旨)" 鉱山地質. 41(3). 190 (1991)

Shunzo Yui：“北海道小樽市赤岩属石英铝石岩（讲座摘要）”矿山地质学 41（3）190（1991）。

YUI,Shunzo: "A systen EPMA data reduction programs using BASIC for Personal computers in 1992" Jour.Fac.Sci,Hokkaido Univ.,Ser.IV. 23(2). 147-158 (1992)

YUI，Shunzo：“1992 年使用 BASIC 的个人计算机系统 EPMA 数据缩减程序”Jour.Fac.Sci，北海道大学，Ser.IV。