CAJ | 학술논문

西天山哈勒尕提含矿花岗岩体位于准噶尔和伊犁地块间的西天山构造带内，其中赋含矽卡岩型铁铜矿床。岩体由闪长岩、花岗闪长岩和二长花岗岩组成。二长花岗岩LA-ICP-MS锆石U-Pb年龄为（357.9±1.3）Ma，时代为晚泥盆世。岩石地球化学特征表明，闪长岩和花岗闪长岩属贫钾富钠准铝质的I型花岗岩，二长花岗岩类则属贫钠富钾的过铝质S型花岗岩。岩相接触关系、地球化学特征表明，其不是同源岩浆分异结晶的产物，应源于长英质-基性麻粒岩相下地壳的分层熔融和先后侵入形成的。结合区域演化历史，西天山哈勒尕提含矿花岗岩体形成于大陆边缘弧环境，地幔动力学为靠俯冲带陆一侧的地幔上隆引起下地壳局部熔融和有少量地幔物质加入的模式。
서천산합륵소제함광화강암체위우준갈이화이리지괴간적서천산구조대내，기중부함석잡암형철동광상。암체유섬장암、화강섬장암화이장화강암조성。이장화강암LA-ICP-MS고석U-Pb년령위（357.9±1.3）Ma，시대위만니분세。암석지구화학특정표명，섬장암화화강섬장암속빈갑부납준려질적I형화강암，이장화강암류칙속빈납부갑적과려질S형화강암。암상접촉관계、지구화학특정표명，기불시동원암장분이결정적산물，응원우장영질-기성마립암상하지각적분층용융화선후침입형성적。결합구역연화역사，서천산합륵소제함광화강암체형성우대륙변연호배경，지만동역학위고부충대륙일측적지만상륭인기하지각국부용융화유소량지만물질가입적모식。
The Halegati ore-bearing granitoids in West Tianshan is located in West Tianshan tectonic belt between Jung-gar and Erie block, which is composed of diorite, granodiorite and monzogranite.LA-ICP-MS zircon U-Pb age of monzo-granite is(357.9±1.3)Ma,belongs to Late Devonian.Diorite and granodiorite are characterized by K-poor,Na-rich and weakly peraluminous, which belong to I-type granite, while monzogranites are relatively K-rich, Na-poor and are S-type granite. The intrusive contact relationship and petrochemical compositions indicate that diorite and monzogranite aren’t derived from comagma by fractional crystallization and they may represent the stratified melting and penetrating in suc-cession of the felsic-mafic granulites phase in lower crust.Combined with regional evolutionary history,the Halegati ore-bearing granitoids in West Tianshan should be formed in the continental margin arc and the mechanism is partial melting of the lower crust caused by mantle uplift near subduction zone.