摘要
对阿尔泰西段铁列里克闪长岩体进行LA-ICP-MS锆石U-Pb定年,分别获得(420.6±3.0)Ma(MSDW=0.063)和(414.8±2.6)Ma(MSDW=0.52)的成岩年龄,确定其形成于晚志留—早泥盆世。岩石富铝质、轻稀土富集,重稀土亏损,轻重稀土分馏明显,具Eu负异常,富集大离子亲石元素(Rb,Ba,K),具明显的Ba,U,Sr,Ta,Nb,P,Ti负异常。认为铁列里克岩体为高钾钙碱性过铝质I-S型花岗岩,具部分陆壳熔融成因,形成于俯冲造山环境下的陆弧环境,为阿尔泰造山带构造演化模式研究提供了证据。
LA-ICP-MS Zircon dating yields the lithogenous age of（420.6±3.0） Ma（MSDW=0.063） and（414.8±2.6） Ma（MSDW=0.52）for intrusive rock body from the western Altay mountain,respectively.We consider that Tielielike rock body belonging to late Silurian to early Devonian.Based on the results of 1：50 000 regional geological survey,Meanwhile,Combilined with field overview,petrological and geochemical characteristics,the rock is rich in Al and LREE,loss in HREE,LREE and HREE are obviously fraction and negative anomaly in Eu,rich in LILE（Rb,Ba,K） and with negative anomaly in Ba,U,Sr,Ta,Nb,P,Ti,So we consider that Tilielike rock body belongs to I-S-type granite with rich K,calcalkaline,alumina,which is from a part of crust melting,the tectonic environment of this rock is subduction synorogenic continental arc environment.All of these provide the evidence for the tectonic evolution pattern.
出处
《新疆地质》
CAS
CSCD
2016年第1期54-61,共8页
Xinjiang Geology
基金
中国地质调查局新疆阿尔泰1:5万M45E021013等四幅区域地质矿产调查项目(12120114040701)资助
