CAJ | 학술논문

东昆仑造山带是我国斑岩型矿床的重要成矿区之一。对东昆仑托克妥 Cu Au（Mo）矿床含矿斑岩利用原位 LA ICP MS 锆石 U Pb 测年和地球化学分析方法，探讨该地区岩体成因以及岩浆作用与成矿作用的深部约束机制。东昆仑托克妥 Cu Au（Mo）矿床含矿二长花岗斑岩年龄为（232．49±0．93） Ma，花岗闪长斑岩年龄为（232．6±1．2）Ma，处于东昆仑碰撞造山阶段。含矿斑岩为二长花岗斑岩和花岗闪长斑岩，具有富硅（w（SiO2）＝63．11％～71．78％）、高钾（w（K2 O）＝2．62％～3．61％）、高镁（w（MgO）＝0．52％～1．89％）、低钛（w（TiO2）＝0．26％～0．53％）和偏铝质（A/CNK＝1．05～1．10）的特征，富集大离子亲石元素 Rb、Ba、K 和 Pb 等，亏损高场强元素 Nb、Ta、Ti 和 P，属于高钾钙碱性系列的 I 型花岗岩。研究认为，托克妥 Cu Au（Mo）矿床形成于大陆动力体制下的伸展背景，与阿尼玛卿洋壳岩石圈北向俯冲碰撞有关的俯冲板片断离有关。
동곤륜조산대시아국반암형광상적중요성광구지일。대동곤륜탁극타 Cu Au（Mo）광상함광반암이용원위 LA ICP MS 고석 U Pb 측년화지구화학분석방법，탐토해지구암체성인이급암장작용여성광작용적심부약속궤제。동곤륜탁극타 Cu Au（Mo）광상함광이장화강반암년령위（232．49±0．93） Ma，화강섬장반암년령위（232．6±1．2）Ma，처우동곤륜팽당조산계단。함광반암위이장화강반암화화강섬장반암，구유부규（w（SiO2）＝63．11％～71．78％）、고갑（w（K2 O）＝2．62％～3．61％）、고미（w（MgO）＝0．52％～1．89％）、저태（w（TiO2）＝0．26％～0．53％）화편려질（A/CNK＝1．05～1．10）적특정，부집대리자친석원소 Rb、Ba、K 화 Pb 등，우손고장강원소 Nb、Ta、Ti 화 P，속우고갑개감성계렬적 I 형화강암。연구인위，탁극타 Cu Au（Mo）광상형성우대륙동력체제하적신전배경，여아니마경양각암석권북향부충팽당유관적부충판편단리유관。
The East Kunlun orogenic belt is one of the important areas of porphyry deposits in China.The authors report situ zircon U Pb age and whole-rock geochemistry data for the ore-bearing porphyry in the Tuoketuo Cu Au(Mo)deposit,which contrainted the processes of magmatism and mineralization.Zircon U Pb dating indicates that the ore-bearing porphyries were emplaced at 232 Ma. These ore-bearing porphyry rocks have high SiO2 contents (63.11% 71.78%),high K contents (2.62% 3.61%),high MgO contents (0.52% 1.89%),and low Ti2 O contents (0.26% 0.53%) contents,with aluminum saturation index(A/CNK)of 1.05 1.10.They are enriched in LILEs(Rb, Ba,K and Pb),depleted in HFSEs (Nb,Ta,Ti and P),metaluminous and high K calc-alkaline, ranging from granodiorite to monzogranite in I rock type.It is suggested that the Tuoketuo Cu Au (Mo)deposit is possibly related to extensional regime,which result from the break-off of the slab during the northward subduction of Animaqing Ocean lithosphere.