Synthetic Fluid Inclusions XIV: Coexisting Silicate Melt and Aqueous Fluid Inclusions in the Haplogranite–H2O–NaCl–KCl System
Synthetic Fluid Inclusions XIV: Coexisting Silicate Melt and Aqueous Fluid Inclusions in the Haplogranite–H2O–NaCl–KCl System
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DOI：
10.1093/petroj/40.10.1509
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发表时间：
1999-10
影响因子：
3.9
通讯作者：
J. Student;R. Bodnar
中科院分区：
文献类型：
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作者：
J. Student;R. Bodnar
在800℃和2000 bar的温度下，在石英饱和单铂层中形成了同时期的硅酸盐熔体和水合成流体包裹体，近年来对硅酸盐熔体包裹体的研究为花岗岩- h2o - nacl - kcl体系。平衡组合作为一种由Ab19·2Or31·1Qtz49·1熔体、石英和水溶液（组成为7.4 wt % NaCl + 5.9 wt % KCl）活化火成岩过程PTX演化的方法，得到了相当广泛的应用。《人》，1974年；腹内充满卵的,1979;Lowenstern, 1995)。熔体含有0.18 wt % Cl -和~ 5.5 wt % H2O。对熔体包裹体的研究引起了特别的兴趣，计算出熔体与非混相流-熔体体系(Roedder，含水流体（D m/aq Cl =C m Cl/C aq Cl）中氯化物的分配系数为0·021。计算dis1979, 1984, 1992；Hansteen & lustenhower, 1990；熔体与水之间Na和K的贡献系数Frezzotti, 1992；Naumov et al., 1992,1996；阳与相D m/aq Na/K=(C m Na/C m K)/(C aq Na/C aq K))为0·40。均质化Bodnar, 1994；Student & Bodnar, 1996)。合成硅酸盐熔体包裹体通过加热测温数据获得的微温度可以在管式炉中以10·0°C/天的增量与已知温度一致，直接用于确定形成温度和预形成温度，而不依赖于尺寸。在测量时，无需调用难以证明的高温加热阶段，加热速率为1°C/min的假设或需要独立的地球气压计产生的均质温度比地温计低约10°C （Roedder & Bodnar, 1980）。Roedder（1992）描述了特定类型的3°C/min的岩浆，尽管两种加热速率都产生了均质不混相（不混相被定义为高于地层温度的存在温度）。在两种加热速率下，均观察到两种或两种以上的非晶态、多组分杂质与Th之间的正相关关系。结果证实，从同期硅酸盐平衡（包括硅酸盐熔体-硅酸盐熔体、硅酸盐熔体和含水流体包裹体）得到的微测温数据可以准确预测熔融-硫化物熔体和硅酸盐熔体-含水流体。在这种P-T形成条件下，如果使用我们研究过的最小熔体包裹体研究的数据来研究合成流体的行为，或者如果熔体包裹体在硅酸盐熔体加热速率（<1°C/min）的条件下使用缓慢包裹体进行均匀化。单倍花岗岩中流体的不混相性
Coeval silicate melt and aqueous synthetic fluid inclusions were INTRODUCTION formed at 800°C and 2000 bars in the quartz-saturated haploIn recent years the study of silicate melt inclusions has granite–H2O–NaCl–KCl system. The equilibrium assemblage congained considerable popularity as a method to charsisted of Ab19·2Or31·1Qtz49·1 melt, quartz, and an aqueous solution acterize the PTX evolution of igneous processes (Andwith a composition of 7·4 wt % NaCl + 5·9 wt % KCl. The erson, 1974; Roedder, 1979; Lowenstern, 1995). Of melt contained 0·18 wt % Cl – and ~5·5 wt % H2O. The special interest has been the study of melt inclusions calculated partition coefficient of chloride between the melt and trapped in an immiscible fluid–melt system (Roedder, aqueous fluid (D m/aq Cl =C m Cl/C aq Cl ) is 0·021. The calculated dis1979, 1984, 1992; Hansteen & Lustenhouwer, 1990; tribution coefficient of Na and K between the melt and the aqueous Frezzotti, 1992; Naumov et al., 1992, 1996; Yang & phase D m/aq Na/K=(C m Na/C m K )/(C aq Na/C aq K )) is 0·40. Homogenization Bodnar, 1994; Student & Bodnar, 1996). Microtemperatures of synthetic silicate melt inclusions obtained by heating thermometric data from such inclusions can be used in 10·0°C/day increments in a tube furnace agreed with known directly to determine formation temperatures and presformation temperatures, with no size dependence. When measured sures, without the necessity of invoking difficult to prove in a high-temperature heating stage, a heating rate of 1°C/min assumptions or requiring an independent geobarometer produced homogenization temperatures that were about 10°C lower or geothermometer (Roedder & Bodnar, 1980). than those obtained from the same inclusions using a heating rate Roedder (1992) described specific types of magmatic of 3°C/min, although both heating rates produced homogenization immiscibility (immiscibility being defined as the existence temperatures above the formation temperature. A positive correlation of two or more non-crystalline, multi-component sobetween inclusion size and Th was observed for both heating rates. lutions which differ in properties and composition at Results confirm that microthermometric data from coeval silicate equilibrium), including silicate melt–silicate melt, silicate melt and aqueous fluid inclusions can be used to accurately predict melt–sulfide melt and silicate melt–aqueous fluid. In this P–T formation conditions if data from the smallest melt inclusions study we have investigated the behavior of synthetic fluid are used, or if the melt inclusions are homogenized using a slow inclusions trapped under conditions of silicate melt– heating rate (<1°C/min). aqueous fluid immiscibility in the haplogranite–