水及其对石化层-石化层边界的影响
David H Green1, William O Hibberson, István Kovács
1School of Earth Sciences and Centre for Ore Deposit Studies, University of Tasmania, Hobart 7001, Tasmania, Australia. David.H.Green@utas.edu.au
Nature
|September 25, 2010
概括
上层地幔中的水含量显著影响其物理性质. 实验表明,在90公里以上的深度,pargasite的分解会导致储水量急剧下降,影响地幔风学,并定义石层-石层边界.
科学领域:
- 地质物理学 地质物理学
- 地质化学 地质化学
- 实验性岩石学 试验性岩石学
背景情况:
- 地球板块构造学涉及石化层与较弱的石化层脱.
- 石层-石层边界的形成机制受到争议,水在地幔风学中的作用是关键因素.
- 水可以削弱地幔矿物质或诱导部分融化,影响风湿学.
研究的目的:
- 实验性地研究水在最上层地幔中的作用,高达6GPa.
- 为了澄清水含量如何影响地幔风学和石化层-石化层边界.
主要方法:
- 新型实验方法模拟最高地幔条件高达6GPa.
- 用富含水的蒸汽对lherzolite进行分析,以确定蒸汽和的固体.
- 测量名义上无水矿物质中的水含量,并确定储水地点.
主要成果:
- 溶石与水的蒸汽和固体温度从1.5GPa时的970°C增加到6GPa时的1350°C.
- 石是主要的储水矿物,但它在3GPa以上变得不稳定.
- 3GPa以上的pargasite的不稳定性导致储水能力和固体温度的急剧下降.
结论:
- 帕加西特的不稳定性在3GPa以上 (约. 90公里的深度) 导致地幔的储水能力大幅下降.
- 在高于3 GPa的压力下,在富含水的地幔 (>180 ppm H2O) 中间溶融的形成改变了地幔的风质.
- 这一过程对于确定石化层-石化层边界至关重要,并与中洋山脊基岩的石化层地幔来源的水含量相匹配.
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