对大别山典型产地榴辉岩中石榴子石和绿辉石的博立叶变换红外光谱（FTIR）观察表明，石榴子石和绿辉石中都含有一定量的结构水，以OH形式赋存。石榴子石中的水含量（H2O. Wt）多为（200-1000）×10-6，可高达2200×10-8；绿辉石中的水含量相对高一些，多在500×10-4以上，最高可达3000×10-5；UHP榴辉岩的全岩水含量可高达1000×10-6。绿辉石的δD值为一67%～—110%。矿物中的水含量和δD值都存在小尺度（同一样品不同颗粒间以及不同样品之间）的不均一性，这不仅表明超高压变质过程中自由流体的活动范围是有限的，而且说明板块的俯冲和折返都是十分快速的。“名义上无水矿物（NAMs）”的结构水含量和分布特征不仅可以示踪大陆深俯冲过程中流体的演化，还可以提供有意义的深俯冲过程的动力学信息。

运用傅立叶变换红外光谱（FTIR）技术，对大别山碧溪岭和黄镇榴辉岩中的绿辉石进行了详细的结构水观察。绿辉石中普遍含有结构水，以OH一的形式存在，含量可达～2000ppm（H2 O砒）。碧溪岭绿辉石的水含量在露头尺度（～150km）上是不均一的，而黄镇绿辉石是均一的（至少在3 km的尺度上）。碧溪岭绿辉石水含量的不均一分布和黄镇绿辉石水含量的均一分布都反映的是原岩特征，碧溪岭榴辉岩原岩经历的水一岩相互作用是“隧道式”的而黄镇是“弥散式”的。碧溪岭榴辉岩的原岩可能是基性的侵入岩而黄镇榴辉岩的原岩可能是玄武岩。碧溪岭绿辉石的水含量（<1400ppm）明显低于黄镇绿辉石（～1 850ppm），这是原岩水含量差异的体现，原岩性质的不同和经历的水一岩相互作用方式的不同造成了原岩水含量的差异。

大别山碧溪岭榴辉岩中有三种含水矿物：多硅白云母、角闪石和黑云母，它们分别是超高压（uHP）阶段（即柯石英榴辉岩相阶段）或者石英榴辉岩相阶段、退变质后成合晶阶段和角闪岩相退变质阶段的产物，本文利用离子探针技术对它们进行了氢同位素和硼同位素的分析。三矿物内部的同位素组成都是均一的，多硅白云母的8D为一105‰±9‰，8n B为一25．9％D±2.O％D；角闪石的8D为一100％D±9％D，8u B为一24.4％D±O.9％D；黑云母的8D为一65％D±4％D，8u B为一19.3％D±1.3‰。多硅白云母和角闪石的氢一硼同位素组成在误差范围内是相同的，而和黑云母则有明显的差别，这表明，从uHP阶段或者石英榴辉岩相阶段到随后的后成合晶阶段，变质流体是内部缓冲的，而在角闪岩相变质阶段，则有了外来流体的加入，这个流体是相对富集D和n B的。碧溪岭榴辉岩矿物相对于其地壳原岩表现出低8nB的特征，说明俯冲过程中板块经历了强烈的脱硼。

利用Fourier变换红外光谱技术，对大别山碧溪岭地区10个榴辉岩中的石榴石进行了详细的结构水分析。结果显示， 所有的石榴石中都含有以OH−形式存在的结构水。结构水含量变化范围大，为164-2034μg/g(H2O)，多数在500μg/g 以上。因此，与绿辉石一样，石榴石也是超高压榴辉岩中重要的携水矿物。石榴石结构水的含量不仅在同一露头（约150m）不同岩石样品间存在较大差异，而且在同一样品（约1cm）的不同颗粒间也明显不同。水分布的不均一性表明：（1）超高压变质过程中自由流体的活动范围是非常有限的（可能在厘米级的尺度上）；（2）板块的俯冲和折返过程都是十分快速的。

Clinopyroxene megacrysts hosted by alkali basalts are a common form of mantle material found in Nushan volcano, Anhui Province, SE China. Compositionally, the clinopyroxene megacrysts are Al-rich augites with no intra-mineral chemical zoning. Oxygen and hydrogen isotopic ratios are constant within single clinopyroxene megacrysts, but display large variation among different samples (d18O= 4.9f6.5x; yD=45f111x). Regular covariations among major elements and REEs and similar 87Sr/86Sr (0.70309 to 0.70346) and 143Nd/144Nd (0.512846 to 0.513010) ratios indicate that these clinopyroxene megacrysts were derived from the same source and crystallized in a parent magma similar in composition to their host basalts. Oxygen isotope data constrain the mantle source to be slightly 18O-depleted, likely resulting from interaction with low d18O oceanic crust. Oxygen and hydrogen isotope data define two different compositional groups for the Nushan clinopyroxene megacrysts, suggesting that the parent magma experienced different petrogenetic processes in the course of its evolution to two groups (group I and group II) and crystallized in two different magma chambers possibly located at different depths. The slight increase of d18O and H2O, and constant yD with Mg# values of group I megacrysts imply a simple fractional crystallization process; the relative large increase of d18O and H2O and decrease of yD with Mg# values of group II megacrysts suggest possible lower continental crust contamination and magma degassing during their crystallization. High water contents of some group II clinopyroxenes decoupled from the others possibly resulted from interaction with host basaltic magmas during their ascent to the surface. Therefore, major element, REE content and O–H–Sr–Nd isotopic compositions suggest the following petrogenetic stages: (1) mantle source contamination due to interaction with low d18O material likely being subducted oceanic crust; (2) crystallization of group I clinopyroxene by simple crystal fractionation; (3) crystallization of group II megacrysts during magmatic contamination by lower continental crustal material with high d18O and water degassing from the evolving magma; (4) increase of water content and hydrogen isotopic composition re-equilibration of some group II megacrysts likely due to the interaction with host basaltic magmas during their ascent to the surface.