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

测定了桑吉伦高地4个辉长岩、3个脉状地幔包体和寄主煌斑岩的微量元素组成(SIMS和ID-TIMS)和锶、钕同位素比值(ID-TIMS)。矿物学和地球化学研究表明，角闪石-金云母-单斜辉石-脉状包体附近存在渗透扩散带，角闪石-金云母-单斜辉石脉附近没有分带。角闪石-金云母-单斜辉石-脉脉附近交代剖面的存在表明它们是最近形成的(不久之后就被夹带到寄主隆起岩中)。在角闪脉附近的寄主橄榄岩中，交代剖面的对准需要更长的时间。用等时线法计算的金云母-单斜辉石-脉岩的初始同位素比值(分别为0.70274±2和0.51243±14)和寄主隆起岩的87Sr/86Sr(0.702715±3)和143Nd/144Nd(0.512399±1)表明两种熔体具有相似的同位素来源。Pravotarlashkin辉长岩的~(87)Sr/~(86)Sr和~(143)Nd/~(144)Nd初始比值(分别为494.6 Ma；0.703706±10和0.512257±2)和角闪岩脉的Rb-Sr和Sm-Nd同位素演化线(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.