中文摘要：

水成为了一个有效工具最近跟踪玄武岩的岩浆的披风来源。在 Xiaogulihe ultrapotassic 调查充满钾的部件的来源 NE 中国的暴烈的岩石，我们测量了由 Fourier 的斑晶转变的 clinopyroxene ( cpx )的水内容红外线的 spectrometry 并且计算了 H ₂ equilibrated 的 O 内容根据 H ₂在 cpx 斑晶之间的 O 并且玄武岩融化。估计的 H ₂ 主要岩浆的 O 内容是低的(0.36wt%0.50wt%) 在海中央山脉暗岩和海洋岛暗岩的范围以内，当它显然比背弧盆暗岩和岛弧暗岩的低时。计算 H ₂ 主要岩浆的 O/Ce 比率是大约 15，它可能类似于使脱水的沉积的(< 100 ) ，但是比正常弄空的披风的显著地低(DMM， H ₂ O/Ce=150210 ) 。低水内容和特别低的 H ₂ 主要岩浆的 O/Ce 比率证明这些 ultrapotassic 的 K 富有的部件暴烈的岩石似乎不大可能从忍受 K 含水的矿物质发源(例如金云母) 在交代矿床 subcontinental lithospheric 披风。与低 ²⁰⁶Pb/ ²⁰⁴ Pb 比率，中等高的 ⁸⁷Sr/ ⁸⁶体积岩石的 Sr 比率和高 ¹⁸橄榄石斑晶的 O 价值，我们建议在披风的K富有的部件 Xiaogulihe ultrapotassic 采购原料暴烈的岩石可以来自在 subduction 期间显著地使脱水了的古老的导出大陆人的沉积(例如，干燥 K-hollandite )。

英文摘要：

Water has become an effective means to trace the mantle source of basaltic magmas recently. To investigate the source of the potassium-rich component in the Xiaogulihe ultrapotassic volcanic rocks of NE China, we measured the water content of clinopyroxene （cpx） phenocrysts by Fourier transform infrared spectrometry and calculated the H2O content of the equilibrated melts according to the partition coefficients of H2O between cpx phenocrysts and basaltic melts. The estimated H2O content of the ＂primary＂ magmas is low （0.36 wt%-0.50 wt%）, within the range of mid-ocean ridge basalts and ocean island basalts, while it is obviously lower than that of backarc basin basalts and island arc basalts. The calculated H20/Ce ratio of the ＂primary＂ magmas is about 15, which might be similar to that of the dehydrated sediments （〈100）, but observably lower than that of the normal depleted mantle （DMM, H2O/Ce = 150-210）. The low water content and especially low H2O/Ce ratio of the ＂primary＂ magmas demonstrate that the K-rich component of these ultrapotassic volcanic rocks seems unlikely tooriginate from K-bearing hydrous minerals （such as phlogopite） in metasomatic subcontinental lithospheric mantle. Combined with the low 206pb/204pb ratios, moderately high 87Sr/86Sr ratios of the bulk rocks and the high δ18O values of olivine phenocrysts, we suggest that the K-rich component in the mantle source of the Xiaogulihe ultrapotassic volcanic rocks may come from ancient continental-derived sediments which dehydrated significantly during subduction （e.g., dry K-hollandite）.