CAJ | 학술논문

阿斯哈石英闪长岩体位于东昆仑中央隆起带，侵入于古元宇金水口岩群中。岩体内产有阿斯哈大型金矿床，石英闪长岩与该区金矿形成具有密切的时空关系。采用锆石 LA ICP MS、XRF 和 ICP MS 对石英闪长岩进行了定年以及地球化学测定。研究表明：该区石英闪长岩属钙碱性准铝质岩石，具有 I型花岗岩的特征；其成岩年龄为（238．4±1．4）Ma；岩体稀土配分曲线几近一致，显示为同源岩浆演化特点，均表现出轻稀土相对富集的右倾特征，Eu 具有弱的负铕异常；岩体明显富集大离子亲石元素，亏损高场强元素；具有明显的“TNT”负异常，显示出安第斯型岩浆弧火成岩构造属性；岩石 Rb/Sr 和 Nb/Ta 值介于地壳和地幔之间，并广泛发育暗色微粒包体，表明岩浆的壳幔混合成因。综上所述认为：阿斯哈金矿床石英闪长岩具有 I 型花岗岩特征，形成于印支期，具有壳幔混合的特征。
아사합석영섬장암체위우동곤륜중앙륭기대，침입우고원우금수구암군중。암체내산유아사합대형금광상，석영섬장암여해구금광형성구유밀절적시공관계。채용고석 LA ICP MS、XRF 화 ICP MS 대석영섬장암진행료정년이급지구화학측정。연구표명：해구석영섬장암속개감성준려질암석，구유 I형화강암적특정；기성암년령위（238．4±1．4）Ma；암체희토배분곡선궤근일치，현시위동원암장연화특점，균표현출경희토상대부집적우경특정，Eu 구유약적부유이상；암체명현부집대리자친석원소，우손고장강원소；구유명현적“TNT”부이상，현시출안제사형암장호화성암구조속성；암석 Rb/Sr 화 Nb/Ta 치개우지각화지만지간，병엄범발육암색미립포체，표명암장적각만혼합성인。종상소술인위：아사합금광상석영섬장암구유 I 형화강암특정，형성우인지기，구유각만혼합적특정。
The Asiha gold deposit is located in the eastern Kunlun uplift belt, and intrudes Jinshuikou Group in Proterozoic.The quartz diorite has closely spatio and temporal relationship with the gold mineralization in this area.The authors adopted LA ICP MS zircon dating,XRF and ICP MS analysis for geochemical characteristics of the quartz diorite.The reasearch results indicate that the quartz diorite belongs to the calc-alkaline and metaluminous I type granite.The emplacement age of the intrusion is (238.4± 1.4)Ma.REE patterns of different samples are basically in accordant,showing their comagmatic evolution.The quartz diorite is comparatively rich in LREE,with weak negative Eu anomalies,remarkably enriched in LILEs,depleted in HFSEs,with negative anomaly about TNT, which are similar to those of ligneous rock in Andean type continental margins.The fact that the values of Rb/Sr and Nb/Ta are between those of the crust and mantle,combined with widespread mafic microgranular enclaves, shows that the magma was derived from crust-mantle mixing source. In summary,the quartz diorite has the characteristics of I-type granite,formed in Indosinian,with crust-mantle mixing characteristics.