Stable isotopic and mineralogical studies of hydrothermal alteration at Arima Spa, Southwest Japan
Stable isotopic and mineralogical studies of hydrothermal alteration at Arima Spa, Southwest Japan
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日本西南部有马温泉热液蚀变的稳定同位素和矿物学研究
DOI：
10.1016/0016-7037(86)90044-x
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发表时间：
1986
影响因子：
5
通讯作者：
Takeshi Nakamura
中科院分区：
文献类型：
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作者：
H. Masuda;H. Sakai;H. Chiba;Y. Matsuhisa;Takeshi Nakamura
日本西南部有马温泉的沃茨具有高盐度（Cl= 54 g/kg）和高同位素比率（δD= − 32，δ 18 O = +10%），从浅威尔斯井中钻到白垩纪蚀变流纹质火山碎屑岩中，围岩蚀变分两期进行。早期的区域蚀变阶段的特点是存在2 M和IM型白云母，钠长石，方解石，方解石和绿帘石，而白云母和Fe-Al 2 O3的形成在牺牲部分钠长石化斜长石和蚀变黑云母或角闪石发生在随后的热液阶段。黄铁矿、闪锌矿、方铅矿和菱铁矿产于热液蚀变带的中部。次生白云母的氧、氢同位素比值表明，区域蚀变是在大气环流作用下进行的，第二阶段热液具有与现今有马卤水相似的非大气成因的化学和稳定同位素特征。随着离热液蚀变中心带距离的增加，白云母的氧和氢同位素比值迅速降低。同位素的变化最好的解释为反映快速降低流体/岩石比的流体渗透距离从狭窄的热液蚀变带到周围area.Speciation计算在Arima温泉现今盐水表明，他们饱和菱铁矿，但不是方解石的深度，在良好的雅阁与矿物学观察。上升时，卤水被富含HCO 3的浅层地下水稀释，菱铁矿和方解石饱和。现今的有马热液系统是第二期热液活动的残余。
The waters of Arima Spa, Southwest Japan, have high salinity (Cl= 54g/kg) and high isotopic ratios (δD= − 32, andδ18O= + 10%.), and issue from shallow wells drilled into altered rhyolitic pyroclastic rocks of Cretaceous age.Alteration of the host rocks occurred in two stages. The earlier regional alteration stage is characterized by the presence of 2M- and IM-type muscovite, albite, chlorite, calcite and epidote, whereas muscovite and Fe-chlorite formation at the expense of partly albitized plagioclase and altered biotite or hornblende occurred in the following hydrothermal stage. Pyrite, sphalerite, galena and siderite are present in the central part of the hydrothermal alteration zone. Oxygen and hydrogen isotopic ratios of secondary muscovite show that regional alteration proceeded under the meteoric circulation, and that the hydrothermal fluid for the second stage had chemical and stable isotopic characteristics of non-meteoric origin similar to the present-day Arima brine. The oxygen and to a lesser extent the hydrogen isotopic ratios of the muscovite rapidly decrease with increasing distance from the central zone of hydrothermal alteration. The isotopic variation is best interpreted as reflecting rapidly decreasing fluid/rock ratios with increasing distance of fluid penetration from the narrow hydrothermal alteration zone into the surrounding area.Speciation computation for the present-day brines at Arima Spa indicates that they are saturated with siderite but not with calcite at depth, in good accord with the mineralogical observations. Upon ascent the brines are diluted by HCO3-rich shallow ground water and are saturated with respect to both siderite and calcite. The present-day Arima hydrothermal system is a remnant of the second stage hydrothermal activity.
Sakai S 等人：“内源性内皮素 1 参与充血性心力衰竭大鼠心脏功能的维持；衰竭心脏中内皮素 1 的产生显着增加。”
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物理修订版 B。
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