热流和水热循环在布范围,俄勒冈州中北部和中北部
Science (New York, N.Y.)
|March 17, 1989
概括
地下水流,而不是深层岩,可能是俄勒冈州高热流的原因.
科学领域:
- 地质物理学 地质物理学
- 火山学 火山学是一门学科.
- 水文学的水文学
背景情况:
- 俄勒冈州中北部的布山脉在年轻的火山岩中表现出接近零的近表面热流.
- 以前的研究表明,在较古老的岩石中,高热量流动的深层岩石热源.
研究的目的:
- 为了研究较低海拔地区较古老的岩石中异常高的热流的原因.
- 区分岩热源和地下水循环作为热流的主要驱动因素.
主要方法:
- 附带热流量测量. 附带热流量测量.
- 热预算分析. 热预算分析.
- 地质评估火山岩石的年龄和形成.
主要成果:
- 地下水循环有效地从具有年轻火山岩 (600万年以下) 的地区去除热量.
- 这种被移除的热量解释了在较旧的岩层中观察到的高附带和导热放电.
- 旧岩石中的热异常可能是一个浅层现象,由区域地下水流驱动.
结论:
- 区域地下水流是观察到的高热量流的更合理的解释,而不是深深的中层地岩源.
- 任何更深的岩热源都很可能是狭窄的,可变的,并且局限于四度弧 (不到200万年).
- 建议进行进一步的深度钻探,以验证热流模型.
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