Springs on and in the vicinity of Mount Hood volcano, Oregon
Springs on and in the vicinity of Mount Hood volcano, Oregon
复制标题
俄勒冈州胡德山火山及其附近的泉水
DOI：
--
复制
发表时间：
2004
期刊：
影响因子：
--
通讯作者：
M. Nathenson
中科院分区：
文献类型：
--
作者：
M. Nathenson
介绍了俄勒冈州胡德山的非热、热和微热温泉、钻孔和喷气孔的化学和同位素数据。胡德山非温泉的温度随海拔升高而降低，与附近气象站的气温相似。非温泉水中溶解成分一般随温度升高而增加，反映了溶解气对火山岩风化作用。非温泉的同位素含量遵循当地的大气水线，通常随海拔升高而变轻。一些低海拔的非温泉具有同位素的轻值，表明水的来源是高海拔的。在胡德山上发现了三个热液系统。据解释，Swim Warm Springs的水源从187°C沸腾，在96°C重新平衡，然后与非热水混合，产生各种泉水中发现的一系列成分。据解释，梅多斯泉的水源从223°C沸腾，在94°C重新平衡，然后与非热水混合，产生了多年来在泉水中发现的一系列成分。这两个系统都含有源自高海拔地区降水的水。峰顶喷气孔的气体地温计温度一般在300℃以上，表明它们不是来自Swim和Meadows热液系统的蒸汽排放。三个热液系统的代表性热排放值为喷气孔10 MWt， Swim 2.2 MWt， Meadows和Cascade泉1.9 MWt。
Chemical and isotopic data are presented for nonthermal, thermal, and slightly thermal springs and drill holes and fumaroles on Mount Hood, Oregon. Temperatures of nonthermal springs on Mount Hood decrease with elevation and are similar to air temperatures from nearby weather stations. Dissolved constituents in nonthermal springs generally increase with spring temperatures and reflect weathering of volcanic rock from the action of dissolved carbon dioxide. Isotopic contents of nonthermal springs follow a local meteoric water line and generally become lighter with elevation. Some nonthermal springs at low-elevation have light values of isotopes indicating a high-elevation source for the water. Three hydrothermal systems have been identified on Mount Hood. Swim Warm Springs is interpreted to have a source water that boiled from 187°C, re-equilibrated at 96°C, and then mixed with nonthermal water to produce the range of compositions found in various springs. The Meadows Spring is interpreted to have a source water that boiled from 223°C, re-equilibrated at 94°C, and then mixed with nonthermal water to produce the range of compositions found in the spring over several years. Both systems contain water that originated as precipitation at higher elevation. The summit fumaroles have gas geothermometer temperatures generally over 300°C, indicating that they are not the steam discharge from the Swim and Meadows hydrothermal systems. Representative values of thermal discharge for the three hydrothermal systems are 10 MWt for the fumaroles, 2.2 MWt for Swim, and 1.9 MWt for the Meadows and Cascade springs.