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Breitenbush Hot Springs Retreat and Conference Center (pronunciation: BRIGHT en BUSH), commonly called Breitenbush Hot Springs or simply Breitenbush (or even "The Bush" by locals), is a worker-owned resort community featuring holistic and spiritual retreats. It is surrounded by the Willamette National Forest in Breitenbush, Marion County, Oregon, United States, east-northeast of Detroit along the West Cascades Scenic Byway and northwest of Mount Jefferson. The closest metropolitan area, Salem, is approximately to the west. The resort is located at the site of the Breitenbush Hot Springs, which drain into the adjacent Breitenbush River. == Springs == Breitenbush Hot Springs has long been the site of natural geothermal springs. It was a frequent gathering place for local Native American groups. The hot springs stem from precipitation on the surrounding Cascade Range. Analysis of the mineral and chemical content indicates an average subsurface temperature of and a migration time of several thousand years.〔(【引用サイトリンク】url=http://seismo.berkeley.edu/~manga/paper41.pdf )〕 The water's long contact with aquifer rock at such temperatures saturates it with dissolved minerals such as sulfate, calcite, analcime, anhydrite, chalcedony, microcline, muscovite, quartz, wairakite, and the elements potassium, sodium, magnesium, calcium, and lithium. The surface temperature of the springs is about —the lower temperature due to heat transfer to cooler rock near the Earth's surface. Heat for the buildings is from one of two wells. To prevent mineral precipitation in the pipes, the wells are fitted with heat exchangers using closed loop water circulation. The drilled wells are approximately deep and produce circulating water at about which is distributed through radiators in each building. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Breitenbush Hot Springs」の詳細全文を読む スポンサード リンク
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