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地质学报  2006 

东营凹陷平南地区火山岩中发现含石盐子晶流体包裹体及其对岩浆脱气的启示

, PP. 1699-1705

Keywords: 石盐子晶,流体包裹体,岩浆脱气,不混溶作用,东营凹陷,平南地区

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Abstract:

本文报道在东营凹陷平南地区滨古斜15井火山岩岩心中发现含石盐子晶流体包裹体.流体包裹体赋存于石英闪长玢岩的石英矿物之中,经显微观察和-185℃低温原位拉曼光谱分析,确定子晶为石盐矿物.显微测温分析结果显示,原生包裹体的均一温度在359~496℃,流体的盐度为43.26%~54.51%.研究样品中5种类型流体包裹体共生,说明流体发生了不混溶作用.岩浆上升过程中温度和压力的降低导致流体发生强烈的不混溶作用,并促进岩浆脱气.由于富CO2流体以岩浆脱气的方式逃离岩浆,而高盐度流体作为脱气之后的残余流体保存在包裹体中,所以包裹体中以高盐度流体(NaCl-H2O体系)为主,而另一端元组分(富CO2流体)较少.含石盐子晶流体包裹体的发现证实平南地区岩浆中存在高盐度流体,研究结果表明该区的岩浆脱气过程与高盐度流体不混溶作用有关.这个发现对进一步了解岩浆脱气机制和中国东部无机成因CO2成藏有重要的启示意义.

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