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首页> 外文期刊>Contributions to Mineralogy and Petrology >Dynamics of mineral crystallization from precipitated slab-derived fluid phase: first in situ synchrotron X-ray measurements
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Dynamics of mineral crystallization from precipitated slab-derived fluid phase: first in situ synchrotron X-ray measurements

机译：沉淀的平板状流体相中矿物结晶的动力学：首次原位同步加速器X射线测量

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Remnants of the fluid phase at ultrahigh pressure (UHP) in subduction environments may be preserved as primary multiphase inclusions in UHP minerals. The mode of crystallization of daughter minerals during precipitation within the inclusion and/or the mechanism of interaction between the fluid at supercritical conditions and the host mineral are still poorly understood from a crystallographic point of view. A case study is represented by garnet-orthopyroxenites from the Maowu Ultramafic Complex (China) deriving from harzburgite precursors metasomatized at similar to 4 GPa, 750 degrees C by a silica-and incompatible trace element-rich fluid phase. This metasomatism produced poikilitic orthopyroxene and inclusion-rich garnet porphyroblasts. Solid multiphase primary inclusions in garnet display a size within a few tens of micrometres and negative crystal shapes. Infilling minerals (spinel: 10-20 vol%; amphibole, chlorite, talc, mica: 80-90 vol%) occur with constant volume proportions and derive from trapped solute-rich aqueous fluids. To constrain the possible mode of precipitation of daughter minerals, we performed for the first time a single-crystal X-ray diffraction experiment by synchrotron radiation at Diamond Light Source. In combination with electron probe microanalyses, this measurement allowed the unique identification of each mineral phase and reciprocal orientations. We demonstrated the epitaxial relationship between spinel and garnet and between some hydrous minerals. Such information is discussed in relation to the physico-chemical aspects of nucleation and growth, shedding light on the mode of mineral crystallization from a fluid phase trapped at supercritical conditions.
机译：俯冲环境中超高压（UHP）的液相残余物可以保留为UHP矿物中的主要多相夹杂物。从晶体学的观点来看，在夹杂物内的沉淀过程中子矿物的结晶模式和/或流体在超临界条件下与主体矿物之间的相互作用机理仍然知之甚少。案例研究以茂武超镁铁质复合物（中国）中的石榴石-原辉石为代表，其衍生自在750℃下通过与二氧化硅和不相容的富含微量元素的不溶质液相相似转变为4 GPa的Harzburgite前体。这种交代作用产生了多晶的邻苯二酚和富集石榴石的成卟啉细胞。石榴石中的固态多相主要内含物显示出数十微米范围内的大小和负晶体形状。填充矿物质（尖晶石：10-20％（体积）;闪石，亚氯酸盐，滑石粉，云母：80-90％（体积））以恒定的体积比例出现，并且来自于富含溶质的水流体。为了限制子矿物质沉淀的可能模式，我们首次通过同步辐射在钻石光源处进行了单晶X射线衍射实验。结合电子探针显微分析，该测量可以唯一识别每个矿物相和相互的方向。我们证明了尖晶石和石榴石之间以及某些含水矿物之间的外延关系。讨论了有关成核和生长的物理化学方面的信息，揭示了从超临界条件下捕获的液相中矿物结晶的模式。

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