A method to synthesize large fluid inclusions in quartz at controlled times and under unfavorable growth conditions
A method to synthesize large fluid inclusions in quartz at controlled times and under unfavorable growth conditions
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一种在受控时间和不利生长条件下合成石英中大型流体包裹体的方法
DOI：
10.2138/am.2009.3054
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发表时间：
2009
影响因子：
3.1
通讯作者：
A. Audétat
中科院分区：
文献类型：
--
作者：
Yuan Li;A. Audétat
一种新的合成技术可以在通常只能获得小包裹体的条件下产生大的流体包裹体，其附加优点是可以控制流体捕获的时间。在第一步中，原生流体包裹体在相对容易产生大包裹体的P-T条件下生长。在第二步骤中，其可在相同实验期间或在预平衡的所需时间之后的单独实验期间进行，在第一步骤期间产生的一些初级夹杂物通过原位压裂而重新打开，从而导致夹杂物含量的部分替换。然后将样品置于高压和高温下，直到导致重新打开的夹杂物的裂纹愈合。为了测试该方法并量化重新打开的包裹体中流体置换的效率，我们在700 °C/200 MPa下制备了原生包裹体，并在第二个实验期间在500 °C/70 MPa下存在组成不同的流体的情况下将它们重新打开。激光烧蚀ICP-MS（LA-ICP-MS）分析的8个主要和11个再填充的包裹体表明，在后者超过97%的原始流体被新的流体所取代。因此，重新填充的包裹体是现场压裂时周围流体的代表。
Abstract A new synthesis technique allows large fluid inclusions to be produced at conditions under which one normally would obtain only small inclusions, with the additional advantage that the timing of fluid entrapment can be controlled. In the first step, primary fluid inclusions are grown at P-T conditions under which it is relatively easy to produce large inclusions. In the second step, which can be performed either during the same experiment or during a separate experiment after a desired time of pre-equilibration, some of the primary inclusions produced during the first step are re-opened by in-situ fracturing, causing partial replacement of the inclusion content. The sample is then left at high pressure and temperature until the cracks leading to the re-opened inclusions are healed. To test the method and quantify the efficiency of fluid replacement in the re-opened inclusions, we produced primary inclusions at 700 °C/200 MPa and re-opened them during a second experiment in the presence of a compositionally different fluid at 500 °C/70 MPa. Laser-ablation ICP-MS (LA-ICP-MS) analyses of eight primary and 11 refilled inclusions demonstrate that in the latter more than 97% of the original fluid was replaced by new fluid. Thus, the refilled inclusions are representative of the surrounding fluid at the time of in situ fracturing.