Fluid Inclusion Studies of Hydrothermal and Metamorphic Processes.

热液和变质过程的流体包裹体研究。

• 批准号: 61460056
• 负责人: YUI Shunzo
• 金额: $ 3.2万
• 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 (B)
• 财政年份: 1986
• 资助国家: 日本
• 起止时间: 1986 至 1987
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-61460056/
• 关键词: Fluid Inclusion; Homogenization Temperature; Trimming Devise for Rock Thin Section; Nurukawa Kuroko Deposits; Tokoro Metamorphic Zone; 恐山噴気帯; 餌釣里鉱鉱床; 常呂帯変成岩

Fluid inclusions in quartz of hydrothermal origin and in metamorphic rock were investigated with the Linkam TH-600 RMS heating-cooling stage on the POH petrographic microscope. 1. A simple devise for trimming of doubly-polished thin section is designed.2. Two types of gold mineralization are recently discovered at the Nurukawa Kuroko deposits, one is in beeded form just beneath the normal bedded Koroko, another is in stock-work rich in quartz at several tens of meter from the bedded one. In order to specify these two mineralization, homogenization temperatures of two phase inclution in quartz were measured but both are at round 270゜C without marked difference.3. The Tokoro metamorphic rocks in the eastern Hokkaido were divided into five metamorphic zones, A through E. Pressure-temperature conditions of the four zones, B through E are estimated from mineral assemblages and experimental data on the minerals except zone A. Homogenization temperature in prehnite from the zone A are 85゜C-125゜C. Considered the correction for the assumed pressure, these values are in concordant with those estiomated to zone B. 4. Osorezan in Aomori-ken is well-known for the active hydrothermal action with heavy metal mineralization, for example, As, Sb, and T1. Recently, auriferous spring water and precipitates are discovered and active gold mineralization is estimated. Fragments of estimated vein quartz are observed near assumed explosion crater of small scale. Homogenization temperatures of fluid inculsions in the quartz show bimodal distribution. Largest concentration is at 210-22゜C, and second one at 250゜C. The former seems to be of secondary origin based on their shape and distribution, therefore, it is estimated that the second hydrothermal action is recorded in quartz grains primarily formed at round 250゜C.

使用 POH 岩相显微镜上的 Linkam TH-600 RMS 加热-冷却台对热液成因石英和变质岩中的流体包裹体进行了研究。 1、设计了一种简单的双抛光薄片修整装置。2．最近在 Nurukawa Kuroko 矿床中发现了两种类型的金矿化，一种是在正常层状 Koroko 下方呈层状的金矿化体，另一种是在距层状层状矿层数十米处富含石英的矿脉中。为了明确这两种矿化，测量了石英中两相包裹体的均一温度，均在270゜C左右，没有明显差异。 3．北海道东部的常吕变质岩被划分为 A 至 E 5 个变质带。B 至 E 4 个变质带的压力-温度条件是根据矿物组合和除 A 区以外的矿物的实验数据估算的。A 区葡萄石的均化温度为 85°C - 125°C。考虑到对假设压力的修正，这些值与 B 区的估计值一致。 4. 青森县的 Osorezan 因与重金属矿化（例如 As、Sb 和 T1）的活跃热液作用而闻名。最近，发现了含金泉水和沉淀物，并估计了活跃的金矿化作用。在假定的小规模爆炸坑附近观察到估计的脉状石英碎片。石英中流体包裹体的均化温度呈现双峰分布。最大浓度出现在 210-22゜C，第二个出现在 250゜C。从形状和分布来看，前者似乎是次生起源的，因此，估计第二次热液作用记录在最初形成于250゜C左右的石英颗粒中。