大油坑

25°10′19.78″N 121°34′48.53″E / 25.1721611°N 121.5801472°E / 25.1721611; 121.5801472

大油坑噴氣口

大油坑是一處位於台灣新北市金山區西南方,靠近台北市北投區,介於七股山大尖後山之間的火山噴氣孔,噴氣量大且活動劇烈,溫度可以達到120℃左右,是全臺灣規模最大的噴氣孔區[1],屬於陽明山國家公園境內。

硫磺採礦

大油坑的噴發蒸氣中含有多種礦物,包括硫磺。1897年時,英商德記礦業公司即取得「草山大油坑」的礦權,開啟大油坑與陽明山區的採硫史[2]。因劃入國家公園範圍內,採礦活動皆已停止,而遺留當時煉製硫磺所用的器具、工寮與採磺古道。大油坑下有天然溫泉露頭,屬硫酸鹽氯化物泉,pH值約1~2,水質呈強酸性,色黃灰,有強烈硫化物的臭味,水溫可達攝氏99度。露頭附近的岩石經強烈的矽化作用,已使原來礦物完全換質為白色的方矽石[1]

大油坑噴發區為特殊的「後火山活動」景觀,但因地質脆弱、易崩塌且有高溫噴氣、溫泉露頭,並不適合一般遊客前往,因此知名度也稍遜於開發完善的小油坑

參見

參考文獻

  1. ^ 1.0 1.1 存档副本. [2009-06-03]. (原始内容存档于2008-06-22).  金山、大油坑火山區
  2. ^ http://www.ymsnp.gov.tw/web/library1a.aspx?NLList_ID=552[永久失效連結] 陽明山的大事記

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