Noble gas isotopic composition of fluid inclusions was analyzed in amphibole, plagioclase and clinopyroxene phenocrysts from the shoshonitic and dacitic volcanic products of the Ciomadul volcanic dome field, the youngest volcanic system within the Carpathian-Pannonian Region. The highest R_c/R_A ratios (3.0–3.8 R_A) were obtained for high-mg clinopyroxene of the Malnaş shoshonite. High-Al amphiboles from the Bixad dacitic pumices have R_c/R_A ratios between 1.16 and 2.11 R_A. These values overlap with the noble gas signature of the present-day CO₂ emission. Thus, our new results reinforce the conclusion that the mantle component of the Ciomadul primitive magmas has relatively lower R_c/R_A signature compared to the nearby Perşani lithospheric mantle. This is likely due to the thorough metasomatic nature resulting in elevated large ion lithophile elements and high water content of the Ciomadul magmas. On the other hand, the R_c/R_A ratios from plagioclase-hosted fluid inclusions and those from low-Al amphiboles are 0.06–0.12 R_A and 0.39–0.77 R_A, respectively defining a dominant crustal origin (>90%) for the trapped fluids. Noteworthy, these minerals represent a low-temperature crystal mush assemblage that existed for protracted time in the magma reservoir. We tested the fraction of mantle contribution for different mantle end-member values, considering also the effect of magma aging on the R/R_A ratios due to longer (up to 50 kyr) residence time. This resulted in a maximum of ~50–60% mantle fluid contribution for the high-Al amphibole-hosted fluid inclusions and a lower, ~25% mantle fluid contribution, for the low-Al amphiboles. The elevated mantle fluid contribution in the case of the high-Al amphiboles can be explained by a fresh magma recharge event and shorter residence time before the eruption. The results of this study imply that fluid inclusion in primitive clinopyroxene and amphibole phenocrysts could reflect the magmatic end-member, which is in the case of Ciomadul a strongly metasomatized lithospheric mantle with relatively low R_c/R_A values. Thus, the noble gas signature of the lithospheric mantle could be heterogeneous even in a restricted area.

分析了喀尔巴阡-潘诺尼亚地区最年轻的火山系统Ciomadul火山穹顶场的火山灰岩和大寒岩系火山岩中的闪石，斜长石和斜辉石的隐晶烯中的流体包裹体稀有气体同位素组成。马尔纳什索什尼特矿的高mg斜辉石获得了最高的R _c / R _A比（3.0–3.8 R _A）。来自比萨德山茱ci的高铝两性化合物的R _c / R _A比在1.16和2.11 R _A之间。这些值与当今CO ₂的稀有气体特征重叠排放。因此，我们的新结果加强了这样的结论：与附近的Perşani岩石圈地幔相比，Ciomadul原始岩浆的地幔成分具有相对较低的R _c / R _A特征。这很可能是由于彻底的交代性质，导致高的离子亲石元素含量增加以及Ciomadul岩浆的高含水量。另一方面，斜长石寄主的流体包裹体与低铝闪石的夹杂物的R _c / R _A比分别为0.06-0.12 R _A和0.39-0.77 R _A，分别为所捕获的流体定义了主要的地壳起源（> 90％）。值得注意的是，这些矿物代表了在岩浆储层中存在较长时间的低温晶体糊状沉积物组合。我们还考虑了岩浆老化对R / R _A的影响，测试了不同地幔末端成员值的地幔贡献率滞留时间更长（最多50年）的比率。对于高Al闪石托管的流体包裹体而言，这导致最大约50-60％的地幔流体贡献，而对于低Al闪石则导致了约25％的地幔流体贡献。在高铝闪石的情况下，地幔流体贡献的增加可以用新的岩浆补给事件和喷发前较短的停留时间来解释。这项研究的结果表明，原始的斜辉石和闪石的隐晶岩中的流体包裹体可能反映了岩浆末端，这在Ciomadul的情况下是强烈交代的岩石圈地幔，具有相对较低的R _c / R _A值。因此，即使在有限的区域内，岩石圈地幔的稀有气体特征也可能是异质的。