中央アジア造山帯の多重脈捕獲岩が示す沈み込みマントル交代作用の同位体的証拠

测定了三基伦高原4个辉长岩侵入体、3个脉状地幔捕虏体和寄主煌斑岩的微量元素组成（SIMS）和ID-TIMS以及Sr和Nd同位素比值（ID-TIMS）。脉状捕虏体的矿物学和地球化学研究表明，在角闪石-辉云母-斜辉石脉附近存在渗透和扩散分带，在角闪石-脉附近不存在分带。角闪石-辉云母-斜辉石脉附近的交代剖面表明其形成时间较近（在被夹带到寄主营岩前不久）。靠近角闪脉的寄主橄榄岩交代剖面的对中需要较长的时间。等时线法计算的辉云母-斜辉石脉的初始同位素87Sr/86Sr和143Nd/144Nd比值（分别为0.70274±2和0.51243±14），以及在444 Ma下计算的寄主营橄榄岩87Sr/86Sr（0.702715±3）和143Nd/144Nd（0.512399±1）表明，两种熔体的同位素来源相似。Pravotarlashkin辉长岩初始同位素87Sr/86Sr和143Nd/144Nd比值（分别为494.6 Ma、0.703706±10和0.512257±2）和角闪岩脉Rb-Sr和Sm-Nd同位素演化谱（分别为0.703705±7和0.512324±1）表明，Pravotarlashkin辉长岩具有与角闪岩脉有关的原生熔体。

Trace element composition (SIMS and ID-TIMS) and isotopic ratios of Sr and Nd (ID-TIMS) were determined for four gabbro intrusions, three veined mantle xenoliths, and host lamprophyre from the Sangilen Highland. Mineralogical and geochemical study of veined xenoliths shows existence of infiltration and diffusion zoning near the amphibole-phlogopite-clinopyroxene-vein and absence of any zoning near the amphibole-veins. The presence of metasomatic profile near the amphibole-phlogopite-clinopyroxene-vein indicates on their recent formation (shortly before entrainment into the host camptonites). The alignment of metasomatic profile in the host peridotite near the amphibole-vein requires a more prolonged period of time. Initial isotopic 87Sr/86Sr and 143Nd/144Nd ratios for the phlogopite-clinopyroxene-vein (0.70274±2 and 0.51243±14, respectively) calculated by isochrone method and host camptonite 87Sr/86Sr (0.702715±3) and 143Nd/144Nd (0.512399±1) calculated at 444 Ma indicate similar isotopic sources for both melts. Initial isotopic 87Sr/86Sr and 143Nd/144Nd ratios of the Pravotarlashkin gabbro massif (494.6 Ma; 0.703706±10 and 0.512257±2, respectively) and Rb-Sr and Sm-Nd isotope evolution lines for the amphibole-vein (0.703705±7 and 0.512324±1, respectively) indicate that Pravotarlashkin gabbro massif has primary melt related to amphibole-vein.