【作者】 刘伟；

【导师】 涂光炽； 赵振华；

【作者基本信息】 中国科学院研究生院（广州地球化学研究所） ， 地球化学， 1998， 博士

【摘要】 本次博士学位论文选择新疆北部的阿拉尔、二台北、萨尔铁列克花岗岩体，进行石英、长石、黑云母或者钠铁闪石的氧氢同位素交换反应动力学研究。阿拉尔岩体主体相岩石的11个样品，以及二台北岩体的11个样品的Δ¹⁸O_{石英—长石}值均为负值，系在次固相条件下与富¹⁸O的流体发生¹⁸O/¹⁶O交换造成的。额尔齐斯推覆带的推覆作用，以及下垫或者岩石圈热结构调整诱导的脱水反应为深部流体提供了来源。与2个岩体侵位相联系的流体系统与岩浆同来源、同上升和侵位，具有围绕岩体分布的“外封皮”性质和“岩浆水”的特点。 萨尔铁列克碱性花岗岩似斑状中粒岩石的样品比细粒岩石者给出较高的相对交换速率常数K_碱性长石/K_石英，以及较长的交换反应时限K_石英t。缓慢冷凝以及大气水的渗透，促进了主体相碱性长石的微组构重建与¹⁸O/¹⁶O交换。可以识别出2种钠铁闪石—大气水相互作用方式：（1）混合+同位素交换2阶段模式；（2）钠铁闪石与大气水的D/H、¹⁸O/¹⁶O交换。更多还原

【Abstract】 In this Ph. D thesis the author performed a systematic research on the oxygen isotope exchange kinetics between external water and coexistent mineral triplets quartz,feldspar,biotite or arfvedsonite from three granite plutons Aral,Ertaibei,and Saertielieke,selected from northern Xinjiang. Coexistent quartz and feldspar separates of 11 rock samples,from the main body of the Aral pluton,and of 11 rock samples,from the Ertaibei pluton,manifest negative AOQuanz-Feidspar values,which could be attributed to the 18O/16O exchange with 18O-enriched water during subsolidus cooling. Derivation of the 18O-enriched fluids was either related to the thrusting of the Ertish thrust zone,or,to the dehydration in the lower crust caused by the underplating or,alternatively,induced by adjustment in the lithospheric thermal structure. Fluid systems associated with emplacement of the Aral and Ertaibei plutons derived from the magma source regions,accompanied the magma body in ascendence,and encircled the plutons as an envelope.The quantitative modelling gives a relatively higher relative rate constant kAikaii-feidspar/kQuaitz and a relatively longer time-duration kquaitzt of exchange for samples of the phenocrystic medium-grained rocks as compared with those of the fine-grained rocks,in the Saertielieke alkali granite pluton. Exsolution and microtextural reorganization of alkali feldspar,and infiltration of meteoric water and the accompanying 18O/16O exchange must have been mutually facilitated by each other during slow cooling. Two modes can be recognized for the arfvedsonite-meteoric water interactions:1) two stage model of mixing plus isotopic exchange;2) D/H and 18O/16O exchange between arfvedsonite and meteoric water.更多还原